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Implementation of simple registration and login
2022-07-25 20:35:00 【Royal shadow time】
- The login page :
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'login.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
// Refresh the picture
function _click() {
var d = new Date();
// When the path changes , Will refresh the picture , and get Method followed by a ? The number will refresh , Create an event object here , Then make the path change constantly through combination
document.getElementById("img").src = "${pageContext.request.contextPath}/img?"+ d.getMilliseconds();
}
// Modify the submission address of the same form
function chaAction(v){
var form3=document.getElementById("form3");
if(v==1){
form3.action="${pageContext.request.contextPath}/login";
}
if(v==2){
form3.action="register.jsp";
}
form3.submit();
}
function save(){
var save=document.getElementById("savepwd");
var hid=document.getElementById("hid");
if(save.checked)
{
// Selected , Means to save the user password
hid.setAttribute("value","1");
}
}
</script>
<style type="text/css">
table{
margin: 30px auto;
border:1px solid #B3CDDB;
font-family:" Microsoft YaHei ";
color:white;
}
td{
padding:10px;
height:40px;
}
.but{
background-color: white;
border:0 none;
height:30px;
width:70px;
font:15px bold ;
font-family:" Microsoft YaHei ";
color:#2088B7;
font-weight:bold;
}
#img{
vertical-align:middle;
}
body{
background: url("2.jpg");
}
</style>
</head>
<body>
<%
// The access is saved in session User name in , Put the user name in the input field
//String username =(String)request.getSession().getAttribute("username");
// obtain cookie Array of
Cookie[] arr=request.getCookies();
String name =null;
String pwd=null;
// Traversal array
if(arr!=null)
{
for(Cookie c : arr)
{
String name1=c.getName();
String value=c.getValue();
// The order here needs attention , In judgment username yes cookie Medium username
if("name".equals(name1))
{
name=value;
}
if("pwd".equals(name1))
{
pwd=value;
}
}
}
%>
<form action="" method="post" id="form3">
<table>
<tr align="center">
<td colspan="2"><font color="#FF00FF"><b><font color="white"> The user login </font></b></font></td>
</tr>
<tr>
<td colspan="2"><font color=red>${errMsg}</font></td>
</tr>
<tr>
<td> user name :</td>
<td><input type="text" name="name" value="<%=name==null?"":name%>"></td>
</tr>
<tr>
<td> password :</td>
<td><input type="password" name="password" value="<%=pwd==null?"":pwd%>" style="vertical-align:middle;"></td>
</tr>
<tr>
<td id="ctd"> Verification Code </td>
<td>
<%-- To create a verification code name attribute , Give Way servlet Get the value entered in the verification code --%>
<input type="text" name="imgCode">
<img src="${pageContext.request.contextPath}/img" id="img" οnclick="_click() ">
<a href="javascript:void(0)" οnclick="_click()" style="text-decoration:none;"><font color="#B3CDDB"> Can't see , In a </font></a>
</td>
</tr>
<tr>
<%-- By modifying the value To achieve the goal --%>
<td><input type="hidden" name="hid" id="hid" value="0"></td>
<td><input type="checkbox" οnclick="save()" id="savepwd"> Whether to save the user password </td>
</tr>
<tr >
<td align="center" colspan="2"><input type="submit" class="but" value=" Sign in " οnclick="chaAction(1)">
<input type="submit" class="but" value=" register " οnclick="chaAction(2)"></td>
</tr>
</table>
</form>
</body>
</html>
2. Registration success page :
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'welcome.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="refresh" content="3;login.jsp">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<style type="text/css">
body{
background: url("2.jpg");
}
div{
height: 200px;
margin-top: 90px;
}
</style>
</head>
<body>
<div align="center" ><font color="white" size="4"><b> Registered successfully ,3 Seconds later, jump to the login page </b></font></div>
</body>
</html>
3. Registration page :
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:set var="root" value="${pageContext.request.contextPath}"/>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title> Registration page </title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<script type="text/javascript">
function _changImg(){
document.getElementById("img").src = "${root}/img?" + new Date().getTime();
}
function chaAction(v){
var form1=document.getElementById("form1");
if(v==1){
form1.action="${root}/registerServlet";
}
if(v==2){
form1.action="login.jsp";
}
form1.submit();
}
</script>
<style type="text/css">
table{
margin: 30px auto;
border:1px solid #B3CDDB;
font-family:" Microsoft YaHei ";
color:white;
}
td{
padding:5px;
height:33px;
}
.but{
background-color: white;
border:0 none;
height:30px;
width:70px;
font:15px bold ;
font-family:" Microsoft YaHei ";
color:#2088B7;
font-weight:bold;
}
#img{
vertical-align:middle;
}
body{
background: url("2.jpg");
}
</style>
</head>
<body>
<center>
<%-- Here you can use ${root} perhaps ${pageContext.Request.contextPath} To get the current project path --%>
<form action="" method="post" id="form1">
<table>
<tr align="center">
<td colspan="2"><font color="#FF00FF"><b><font color="white"> User registration </font></b></font></td>
</tr>
<tr>
<td name="errMsg" align="center"><font color="red">${errMsg }</font></td>
</tr>
<tr>
<td> user name <font color="red">*</font></td>
<td><input type="text" name="name"/></td>
</tr>
<tr>
<td> password </td>
<td><input type="password" name="password"/></td>
</tr>
<tr>
<td> Confirm the password </td>
<td><input type="password" name="repassword"/></td>
</tr>
<tr>
<td> Age </td>
<td><input type="text" name="age"/></td>
</tr>
<tr>
<td> Gender </td>
<td>
<input type="radio" name="sex" value=" male "/> male
<input type="radio" name="sex" value=" Woman "/> Woman
</td>
</tr>
<tr>
<td> mailbox </td>
<td><input type="text" name="email"/></td>
</tr>
<tr>
<td> Birthday </td>
<td><input type="text" name="birthday" id="birthday"/></td>
</tr>
<tr>
<td> hobby </td>
<td>
<input type="checkbox" name="hobby" value="C"/>C
<input type="checkbox" name="hobby" value="C++"/>C++
<input type="checkbox" name="hobby" value="Java"/>Java
<input type="checkbox" name="hobby" value="IOS"/>IOS
<input type="checkbox" name="hobby" value="PHP"/>PHP
<input type="checkbox" name="hobby" value="Android"/>Android
</td>
</tr>
<tr>
<td> Address </td>
<td>
<select name="address">
<option value="none">-- Please select an address --</option>
<option value=" Beijing "> Beijing </option>
<option value=" Shanghai "> Shanghai </option>
<option value=" nanjing "> nanjing </option>
<option value=" Guangzhou "> Guangzhou </option>
<option value=" Shenzhen "> Shenzhen </option>
</select>
</td>
</tr>
<tr>
<td> Self description </td>
<td>
<textarea cols="40" rows="10" name="description"></textarea>
</td>
</tr>
<tr>
<td> Enter verification code </td>
<td>
<input type="text" name="checkImg" />
<img style="cursor: pointer;" alt="" src="${root }/img" id="img" οnclick="_changImg();"/>
<a href="javascript:void(0);" οnclick="_changImg();" style="text-decoration:none"><font color="#B3CDDB"> Can't see , In a </font></a>
</td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value=" register " class="but" οnclick="chaAction(1)"/>
<input type="submit" class="but" value=" Return to login " οnclick="chaAction(2)"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
4. The login page : <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<style type="text/css">
body{
background: url("2.jpg");
}
div{
height: 200px;
margin-top: 90px;
}
</style>
</head>
<body>
<div align="center" ><marquee><font color="white" size="4"><b> Login successful </b></font></marquee></div>
</body>
</html>
5. User class :package com.yynh.domain;
import java.sql.Date;
/**
* @author wjn And day13 data user Table corresponding implementation class
*/
public class User {
private int id;
private String name;
private String password;
private int age;
private String sex;
private String email;
private String hobby;
private String address;
private String description;
private Date birthday;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getHobby() {
return hobby;
}
public void setHobby(String hobby) {
this.hobby = hobby;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", password=" + password + ", age=" + age + ", sex=" + sex + ", email=" + email + ", hobby=" + hobby + ", address=" + address + ", description=" + description + ", birthday=" + birthday + "]";
}
}
6. Tool class : package com.yynh.utils;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import com.mchange.v2.c3p0.ComboPooledDataSource;
public class JDBCUtils {
// establish c3p0 Kaiyuan connection pool object , Pass in the specified configuration
static ComboPooledDataSource cpds = new ComboPooledDataSource();
// Release resources
public static void release(Connection conn, ResultSet rs, Statement stmt) {
try {
// In order to prevent rs No exception is reported , Judge
if (rs != null) {
rs.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
// If there is an exception in the judgment , Just put rs assignment null, Avoid problems
rs = null;
// If it is select operation , Continue to call the other two exceptions
release(conn, stmt);
}
// Release resources for secondary optimization , Through function rewriting , To distinguish whether it is select operation
public static void release(Connection conn, Statement stmt) {
try {
if (stmt != null) {
stmt.close();
}
} catch (Exception e2) {
}
stmt = null;
try {
if (conn != null) {
conn.close();
}
} catch (Exception e2) {
}
conn = null;
}
public static Connection getCon() throws Exception {
// Get connections through the connection pool
Connection conn = cpds.getConnection();
// take conn return
return conn;
}
}
7. The configuration file <?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
<!-- The default configuration ,c3p0 The framework loads this default configuration by default -->
<default-config>
<!-- To configure JDBC Four basic attributes -->
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql://localhost:3306/day13</property>
<property name="user">root</property>
<property name="password">123</property>
</default-config> <!-- This app is massive! -->
</c3p0-config>
8. Verification Code : package com.yynh.web;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ImgServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Image verification code
// Create a canvas
// Set length and width
int width = 120;
int height = 35;
// imageType It refers to the format of color , Here we use rgb
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// Get the brush from the canvas , getGraphics() graphics
Graphics2D g = bi.createGraphics();
// Fill in the background color
g.setColor(Color.white);
// Fill in the range
g.fillRect(0, 0, width, height);
// bound box
g.setColor(Color.red);
// Fill in the border
g.drawRect(0, 0, width - 1, height - 1);
// Generate four random data
// Prepare the data ctrl+shift+x Capitalize the selected text , Ctrl + shift +y Lower the selected text
String data = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
// Set a random object
Random r = new Random();
// Set a variable to save the verification code
String code = "";
// loop
for (int i = 1; i < 5; i++) {
// Rotate the canvas
// Get a random value , First get a range in -1-1 Random number between , Re reduction 0.5 You get one 0-0.5 Random number between
double theta = (Math.random() - 0.5);
// Rotate a certain angle
g.rotate(theta, 22 * i, height / 2);
// Set the font , Pass a font object
g.setFont(new Font(" Song style ", Font.ITALIC, 27));
// Set random colors adopt color Constructor to pass parameters
g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));
// Randomly obtain a subscript according to the length of the string , Then get a character by subscript , Then it becomes a string
String str = data.charAt(r.nextInt(data.length())) + "";
// Write characters to the canvas , And adjust the position
g.drawString(str, i * 22, 30);
// Rotate the canvas back
g.rotate(-theta, 22 * i, height / 2);
// Splice each character together
code += str;
}
// Set up session preservation code
request.getSession().setAttribute("checkCode", code);
// Drew interference
for (int i = 1; i < 7; i++) {
// Set random colors
g.setColor(new Color(r.nextInt(100) + 100, r.nextInt(100) + 100, r.nextInt(100) + 100));
// Draw lines on the canvas Two values determine a point , Two points define a line
g.drawLine(r.nextInt(width), r.nextInt(height), r.nextInt(width), r.nextInt(height));
}
// Output canvas to browser
ImageIO.write(bi, "jpg", response.getOutputStream());
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
9. Sign in servlet package com.yynh.web;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.yynh.domain.User;
import com.yynh.service.ServiceLogin;
import com.yynh.service.ServiceUser;
public class LoginServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Solve the mess
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
// Get the verification code saved locally
String checkCode = (String) request.getSession().getAttribute("checkCode");
// Print verification code
System.out.println(checkCode);
// Get the verification code entered by the user
String imgCode = request.getParameter("imgCode");
System.out.println(imgCode);
// Remove the local verification code
request.getSession().removeAttribute("checkCode");
// First step : Determine whether the verification code is correct
if (imgCode == null || !imgCode.equalsIgnoreCase(checkCode)) {
// When the verification code is not entered or is different from the local verification code , Request forwarding There is no need to add the item name for forwarding
request.setAttribute("errMsg", " The verification code is wrong ");
request.getRequestDispatcher("/login.jsp").forward(request, response);
return;
}
// get data
User user = new User();
String name = request.getParameter("name");
String password = request.getParameter("password");
user.setName(name);
user.setPassword(password);
// Call business
ServiceUser su = new ServiceLogin();
int i = su.loginUser(user);
if (i == 1) {
// Represents a successful login
Cookie cookie = new Cookie("name", name);
// Setup time
cookie.setMaxAge(60 * 60 * 24);
// Set the path
cookie.setPath("/");
response.addCookie(cookie);
String hid = request.getParameter("hid");
System.out.println("woshi" + hid);
if (hid.equals("1")) {
Cookie coo = new Cookie("pwd", password);
// Setup time
cookie.setMaxAge(60 * 2);
// Set the path
cookie.setPath("/");
response.addCookie(coo);
}
// Save user objects to session in
request.getSession().setAttribute("user", user);
// Redirect to success page
response.sendRedirect(request.getContextPath());
return;
}
if (i == 0) {
// Represents user name or secret error
request.setAttribute("errMsg", " Wrong user name or password ");
request.getRequestDispatcher("/login.jsp").forward(request, response);
return;
}
if (i == -1) {
// Represents an exception
request.setAttribute("errMsg", " server is busy , Try again later ");
request.getRequestDispatcher("/login.jsp").forward(request, response);
return;
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
10 register servlet package com.yynh.web;
import java.io.IOException;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.beanutils.BeanUtils;
import com.yynh.domain.User;
import com.yynh.service.ServiceUser;
import com.yynh.service.ServiceUserCheck;
public class RegisterServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Solve the mess
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
// Get the verification code saved locally
String checkCode = (String) request.getSession().getAttribute("checkCode");
// Print verification code
System.out.println(checkCode);
// Get the verification code entered by the user
String checkImg = request.getParameter("checkImg");
System.out.println(checkImg);
// Remove the local verification code
request.getSession().removeAttribute("checkCode");
// First step : Determine whether the verification code is correct
if (checkImg == null || !checkImg.equalsIgnoreCase(checkCode)) {
// When the verification code is not entered or is different from the local verification code , Request forwarding There is no need to add the item name for forwarding
request.setAttribute("errMsg", " The verification code is wrong ");
request.getRequestDispatcher("/register.jsp").forward(request, response);
return;
}
// Encapsulated data , Call the business layer to process business
User user = new User();
// Get all properties
Map<String, String[]> map = request.getParameterMap();
// obtain javabean
try {
// Encapsulate data into javaBean in
BeanUtils.populate(user, map);
} catch (Exception e) {
e.printStackTrace();
}
// The second step : Package hobbies separately
String[] hobby = request.getParameterValues("hobby");
String temp = "";
for (String s : hobby) {
temp = temp + "," + s;
}
// Remove the starting comma
temp = temp.substring(1);
user.setHobby(temp);
System.out.println(user);
// The third step : call service Layer handles business
ServiceUser sUser = new ServiceUserCheck();
// Receive the returned value
int i = sUser.register(user);
// Process the returned value
if (i == 1) {
// On behalf of successful registration , Jump to the success page
// Jump requires project name
response.sendRedirect(request.getContextPath() + "/welcome.jsp");
return;
} else if (i == 0) {
// Representative registration failed , User name already exists
// Prompt information
request.setAttribute("errMsg", " The user name has been registered ");
request.getRequestDispatcher("/register.jsp").forward(request, response);
return;
} else {
// It means there is an exception
request.setAttribute("errMsg", " server is busy , Please try again later ");
request.getRequestDispatcher("/register.jsp").forward(request, response);
return;
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// call doGet Method
doGet(request, response);
}
}
11. Sign in service package com.yynh.service;
import com.yynh.dao.UserDao;
import com.yynh.dao.UserDaoReg;
import com.yynh.domain.User;
public class ServiceLogin implements ServiceUser {
@Override
public int register(User user) {
// TODO Auto-generated method stub
return 0;
}
@Override
public int loginUser(User user) {
UserDao ud = new UserDaoReg();
int i = ud.login(user);
if (i == 1) {
// Represents a successful login
return 1;
} else {
return i;
}
}
}
12. register service package com.yynh.service;
import com.yynh.dao.UserDao;
import com.yynh.dao.UserDaoReg;
import com.yynh.domain.User;
/**
* @author yynh_
* @ Register for business
*/
public class ServiceUserCheck implements ServiceUser {
public int register(User user) {
UserDao ud = new UserDaoReg();
// Determine whether the user name has been registered
int i = ud.findUser(user.getName());
if (i == 1) {
// Representatives can register users
// Encrypted password There is no way to login after encryption
// String pwd = MD5Utils.getPwd(user.getPassword());
// Store the encrypted results in user in
// user.setPassword(pwd);
// Registered successfully
return ud.registerUser(user);
} else {
// Represents that the user name already exists or there is an exception
return i;
}
}
public int loginUser(User user) {
return 0;
}
}
13. dao layer package com.yynh.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import com.yynh.domain.User;
import com.yynh.utils.JDBCUtils;
public class UserDaoReg implements UserDao {
// The user login
public int login(User user) {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
// Get the connection
conn = JDBCUtils.getCon();
String sql = "select * from user where name=? and password=?";
// Get send sql object
stmt = conn.prepareStatement(sql);
// Set properties
stmt.setString(1, user.getName());
stmt.setString(2, user.getPassword());
// send out sql, Accept return value
rs = stmt.executeQuery();
if (rs.next()) {
// The password and user name are correct , You can log in.
return 1;
} else {
// Represents incorrect
return 0;
}
} catch (Exception e) {
e.printStackTrace();
return -1;
} finally {
JDBCUtils.release(conn, rs, stmt);
}
}
// Registered users
public int registerUser(User user) {
Connection conn = null;
PreparedStatement stmt = null;
try {
// Get the connection
conn = JDBCUtils.getCon();
String sql = "insert into user values(null,?,?,?,?,?,?,?,?,?)";
// Get send sql object
stmt = conn.prepareStatement(sql);
// Set properties
stmt.setString(1, user.getName());
stmt.setString(2, user.getPassword());
stmt.setInt(3, user.getAge());
stmt.setString(4, user.getSex());
stmt.setString(5, user.getEmail());
stmt.setString(6, user.getHobby());
stmt.setString(7, user.getAddress());
stmt.setString(8, user.getDescription());
stmt.setDate(9, user.getBirthday());
stmt.executeUpdate();
return 1;
} catch (Exception e) {
e.printStackTrace();
return -1;
}
}
// Query whether the user name exists
public int findUser(String name) {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
// Get the connection
conn = JDBCUtils.getCon();
String sql = "select * from user where name=?";
// Get send sql object
stmt = conn.prepareStatement(sql);
// Set properties
stmt.setString(1, name);
// send out sql, Accept return value
rs = stmt.executeQuery();
if (rs.next()) {
// It means that there is a duplicate user name
return 0;
} else {
// No duplicate can be registered
return 1;
}
} catch (Exception e) {
e.printStackTrace();
return -1;
} finally {
JDBCUtils.release(conn, rs, stmt);
}
}
}
effect :
For the first time in csdn Post , alas , I don't understand the typesetting here , I don't know what it will look like .......
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'login.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
// Refresh the picture
function _click() {
var d = new Date();
// When the path changes , Will refresh the picture , and get Method followed by a ? The number will refresh , Create an event object here , Then make the path change constantly through combination
document.getElementById("img").src = "${pageContext.request.contextPath}/img?"+ d.getMilliseconds();
}
// Modify the submission address of the same form
function chaAction(v){
var form3=document.getElementById("form3");
if(v==1){
form3.action="${pageContext.request.contextPath}/login";
}
if(v==2){
form3.action="register.jsp";
}
form3.submit();
}
function save(){
var save=document.getElementById("savepwd");
var hid=document.getElementById("hid");
if(save.checked)
{
// Selected , Means to save the user password
hid.setAttribute("value","1");
}
}
</script>
<style type="text/css">
table{
margin: 30px auto;
border:1px solid #B3CDDB;
font-family:" Microsoft YaHei ";
color:white;
}
td{
padding:10px;
height:40px;
}
.but{
background-color: white;
border:0 none;
height:30px;
width:70px;
font:15px bold ;
font-family:" Microsoft YaHei ";
color:#2088B7;
font-weight:bold;
}
#img{
vertical-align:middle;
}
body{
background: url("2.jpg");
}
</style>
</head>
<body>
<%
// The access is saved in session User name in , Put the user name in the input field
//String username =(String)request.getSession().getAttribute("username");
// obtain cookie Array of
Cookie[] arr=request.getCookies();
String name =null;
String pwd=null;
// Traversal array
if(arr!=null)
{
for(Cookie c : arr)
{
String name1=c.getName();
String value=c.getValue();
// The order here needs attention , In judgment username yes cookie Medium username
if("name".equals(name1))
{
name=value;
}
if("pwd".equals(name1))
{
pwd=value;
}
}
}
%>
<form action="" method="post" id="form3">
<table>
<tr align="center">
<td colspan="2"><font color="#FF00FF"><b><font color="white"> The user login </font></b></font></td>
</tr>
<tr>
<td colspan="2"><font color=red>${errMsg}</font></td>
</tr>
<tr>
<td> user name :</td>
<td><input type="text" name="name" value="<%=name==null?"":name%>"></td>
</tr>
<tr>
<td> password :</td>
<td><input type="password" name="password" value="<%=pwd==null?"":pwd%>" style="vertical-align:middle;"></td>
</tr>
<tr>
<td id="ctd"> Verification Code </td>
<td>
<%-- To create a verification code name attribute , Give Way servlet Get the value entered in the verification code --%>
<input type="text" name="imgCode">
<img src="${pageContext.request.contextPath}/img" id="img" οnclick="_click() ">
<a href="javascript:void(0)" οnclick="_click()" style="text-decoration:none;"><font color="#B3CDDB"> Can't see , In a </font></a>
</td>
</tr>
<tr>
<%-- By modifying the value To achieve the goal --%>
<td><input type="hidden" name="hid" id="hid" value="0"></td>
<td><input type="checkbox" οnclick="save()" id="savepwd"> Whether to save the user password </td>
</tr>
<tr >
<td align="center" colspan="2"><input type="submit" class="but" value=" Sign in " οnclick="chaAction(1)">
<input type="submit" class="but" value=" register " οnclick="chaAction(2)"></td>
</tr>
</table>
</form>
</body>
</html>
2. Registration success page :
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'welcome.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="refresh" content="3;login.jsp">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<style type="text/css">
body{
background: url("2.jpg");
}
div{
height: 200px;
margin-top: 90px;
}
</style>
</head>
<body>
<div align="center" ><font color="white" size="4"><b> Registered successfully ,3 Seconds later, jump to the login page </b></font></div>
</body>
</html>
3. Registration page :
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:set var="root" value="${pageContext.request.contextPath}"/>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title> Registration page </title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<script type="text/javascript">
function _changImg(){
document.getElementById("img").src = "${root}/img?" + new Date().getTime();
}
function chaAction(v){
var form1=document.getElementById("form1");
if(v==1){
form1.action="${root}/registerServlet";
}
if(v==2){
form1.action="login.jsp";
}
form1.submit();
}
</script>
<style type="text/css">
table{
margin: 30px auto;
border:1px solid #B3CDDB;
font-family:" Microsoft YaHei ";
color:white;
}
td{
padding:5px;
height:33px;
}
.but{
background-color: white;
border:0 none;
height:30px;
width:70px;
font:15px bold ;
font-family:" Microsoft YaHei ";
color:#2088B7;
font-weight:bold;
}
#img{
vertical-align:middle;
}
body{
background: url("2.jpg");
}
</style>
</head>
<body>
<center>
<%-- Here you can use ${root} perhaps ${pageContext.Request.contextPath} To get the current project path --%>
<form action="" method="post" id="form1">
<table>
<tr align="center">
<td colspan="2"><font color="#FF00FF"><b><font color="white"> User registration </font></b></font></td>
</tr>
<tr>
<td name="errMsg" align="center"><font color="red">${errMsg }</font></td>
</tr>
<tr>
<td> user name <font color="red">*</font></td>
<td><input type="text" name="name"/></td>
</tr>
<tr>
<td> password </td>
<td><input type="password" name="password"/></td>
</tr>
<tr>
<td> Confirm the password </td>
<td><input type="password" name="repassword"/></td>
</tr>
<tr>
<td> Age </td>
<td><input type="text" name="age"/></td>
</tr>
<tr>
<td> Gender </td>
<td>
<input type="radio" name="sex" value=" male "/> male
<input type="radio" name="sex" value=" Woman "/> Woman
</td>
</tr>
<tr>
<td> mailbox </td>
<td><input type="text" name="email"/></td>
</tr>
<tr>
<td> Birthday </td>
<td><input type="text" name="birthday" id="birthday"/></td>
</tr>
<tr>
<td> hobby </td>
<td>
<input type="checkbox" name="hobby" value="C"/>C
<input type="checkbox" name="hobby" value="C++"/>C++
<input type="checkbox" name="hobby" value="Java"/>Java
<input type="checkbox" name="hobby" value="IOS"/>IOS
<input type="checkbox" name="hobby" value="PHP"/>PHP
<input type="checkbox" name="hobby" value="Android"/>Android
</td>
</tr>
<tr>
<td> Address </td>
<td>
<select name="address">
<option value="none">-- Please select an address --</option>
<option value=" Beijing "> Beijing </option>
<option value=" Shanghai "> Shanghai </option>
<option value=" nanjing "> nanjing </option>
<option value=" Guangzhou "> Guangzhou </option>
<option value=" Shenzhen "> Shenzhen </option>
</select>
</td>
</tr>
<tr>
<td> Self description </td>
<td>
<textarea cols="40" rows="10" name="description"></textarea>
</td>
</tr>
<tr>
<td> Enter verification code </td>
<td>
<input type="text" name="checkImg" />
<img style="cursor: pointer;" alt="" src="${root }/img" id="img" οnclick="_changImg();"/>
<a href="javascript:void(0);" οnclick="_changImg();" style="text-decoration:none"><font color="#B3CDDB"> Can't see , In a </font></a>
</td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value=" register " class="but" οnclick="chaAction(1)"/>
<input type="submit" class="but" value=" Return to login " οnclick="chaAction(2)"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<style type="text/css">
body{
background: url("2.jpg");
}
div{
height: 200px;
margin-top: 90px;
}
</style>
</head>
<body>
<div align="center" ><marquee><font color="white" size="4"><b> Login successful </b></font></marquee></div>
</body>
</html>
5. User class :
package com.yynh.domain;
import java.sql.Date;
/**
* @author wjn And day13 data user Table corresponding implementation class
*/
public class User {
private int id;
private String name;
private String password;
private int age;
private String sex;
private String email;
private String hobby;
private String address;
private String description;
private Date birthday;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getHobby() {
return hobby;
}
public void setHobby(String hobby) {
this.hobby = hobby;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", password=" + password + ", age=" + age + ", sex=" + sex + ", email=" + email + ", hobby=" + hobby + ", address=" + address + ", description=" + description + ", birthday=" + birthday + "]";
}
}
package com.yynh.utils;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import com.mchange.v2.c3p0.ComboPooledDataSource;
public class JDBCUtils {
// establish c3p0 Kaiyuan connection pool object , Pass in the specified configuration
static ComboPooledDataSource cpds = new ComboPooledDataSource();
// Release resources
public static void release(Connection conn, ResultSet rs, Statement stmt) {
try {
// In order to prevent rs No exception is reported , Judge
if (rs != null) {
rs.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
// If there is an exception in the judgment , Just put rs assignment null, Avoid problems
rs = null;
// If it is select operation , Continue to call the other two exceptions
release(conn, stmt);
}
// Release resources for secondary optimization , Through function rewriting , To distinguish whether it is select operation
public static void release(Connection conn, Statement stmt) {
try {
if (stmt != null) {
stmt.close();
}
} catch (Exception e2) {
}
stmt = null;
try {
if (conn != null) {
conn.close();
}
} catch (Exception e2) {
}
conn = null;
}
public static Connection getCon() throws Exception {
// Get connections through the connection pool
Connection conn = cpds.getConnection();
// take conn return
return conn;
}
}
7. The configuration file
<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
<!-- The default configuration ,c3p0 The framework loads this default configuration by default -->
<default-config>
<!-- To configure JDBC Four basic attributes -->
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql://localhost:3306/day13</property>
<property name="user">root</property>
<property name="password">123</property>
</default-config> <!-- This app is massive! -->
</c3p0-config>8. Verification Code :
package com.yynh.web;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ImgServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Image verification code
// Create a canvas
// Set length and width
int width = 120;
int height = 35;
// imageType It refers to the format of color , Here we use rgb
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// Get the brush from the canvas , getGraphics() graphics
Graphics2D g = bi.createGraphics();
// Fill in the background color
g.setColor(Color.white);
// Fill in the range
g.fillRect(0, 0, width, height);
// bound box
g.setColor(Color.red);
// Fill in the border
g.drawRect(0, 0, width - 1, height - 1);
// Generate four random data
// Prepare the data ctrl+shift+x Capitalize the selected text , Ctrl + shift +y Lower the selected text
String data = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
// Set a random object
Random r = new Random();
// Set a variable to save the verification code
String code = "";
// loop
for (int i = 1; i < 5; i++) {
// Rotate the canvas
// Get a random value , First get a range in -1-1 Random number between , Re reduction 0.5 You get one 0-0.5 Random number between
double theta = (Math.random() - 0.5);
// Rotate a certain angle
g.rotate(theta, 22 * i, height / 2);
// Set the font , Pass a font object
g.setFont(new Font(" Song style ", Font.ITALIC, 27));
// Set random colors adopt color Constructor to pass parameters
g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));
// Randomly obtain a subscript according to the length of the string , Then get a character by subscript , Then it becomes a string
String str = data.charAt(r.nextInt(data.length())) + "";
// Write characters to the canvas , And adjust the position
g.drawString(str, i * 22, 30);
// Rotate the canvas back
g.rotate(-theta, 22 * i, height / 2);
// Splice each character together
code += str;
}
// Set up session preservation code
request.getSession().setAttribute("checkCode", code);
// Drew interference
for (int i = 1; i < 7; i++) {
// Set random colors
g.setColor(new Color(r.nextInt(100) + 100, r.nextInt(100) + 100, r.nextInt(100) + 100));
// Draw lines on the canvas Two values determine a point , Two points define a line
g.drawLine(r.nextInt(width), r.nextInt(height), r.nextInt(width), r.nextInt(height));
}
// Output canvas to browser
ImageIO.write(bi, "jpg", response.getOutputStream());
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
package com.yynh.web;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.yynh.domain.User;
import com.yynh.service.ServiceLogin;
import com.yynh.service.ServiceUser;
public class LoginServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Solve the mess
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
// Get the verification code saved locally
String checkCode = (String) request.getSession().getAttribute("checkCode");
// Print verification code
System.out.println(checkCode);
// Get the verification code entered by the user
String imgCode = request.getParameter("imgCode");
System.out.println(imgCode);
// Remove the local verification code
request.getSession().removeAttribute("checkCode");
// First step : Determine whether the verification code is correct
if (imgCode == null || !imgCode.equalsIgnoreCase(checkCode)) {
// When the verification code is not entered or is different from the local verification code , Request forwarding There is no need to add the item name for forwarding
request.setAttribute("errMsg", " The verification code is wrong ");
request.getRequestDispatcher("/login.jsp").forward(request, response);
return;
}
// get data
User user = new User();
String name = request.getParameter("name");
String password = request.getParameter("password");
user.setName(name);
user.setPassword(password);
// Call business
ServiceUser su = new ServiceLogin();
int i = su.loginUser(user);
if (i == 1) {
// Represents a successful login
Cookie cookie = new Cookie("name", name);
// Setup time
cookie.setMaxAge(60 * 60 * 24);
// Set the path
cookie.setPath("/");
response.addCookie(cookie);
String hid = request.getParameter("hid");
System.out.println("woshi" + hid);
if (hid.equals("1")) {
Cookie coo = new Cookie("pwd", password);
// Setup time
cookie.setMaxAge(60 * 2);
// Set the path
cookie.setPath("/");
response.addCookie(coo);
}
// Save user objects to session in
request.getSession().setAttribute("user", user);
// Redirect to success page
response.sendRedirect(request.getContextPath());
return;
}
if (i == 0) {
// Represents user name or secret error
request.setAttribute("errMsg", " Wrong user name or password ");
request.getRequestDispatcher("/login.jsp").forward(request, response);
return;
}
if (i == -1) {
// Represents an exception
request.setAttribute("errMsg", " server is busy , Try again later ");
request.getRequestDispatcher("/login.jsp").forward(request, response);
return;
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
package com.yynh.web;
import java.io.IOException;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.beanutils.BeanUtils;
import com.yynh.domain.User;
import com.yynh.service.ServiceUser;
import com.yynh.service.ServiceUserCheck;
public class RegisterServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Solve the mess
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
// Get the verification code saved locally
String checkCode = (String) request.getSession().getAttribute("checkCode");
// Print verification code
System.out.println(checkCode);
// Get the verification code entered by the user
String checkImg = request.getParameter("checkImg");
System.out.println(checkImg);
// Remove the local verification code
request.getSession().removeAttribute("checkCode");
// First step : Determine whether the verification code is correct
if (checkImg == null || !checkImg.equalsIgnoreCase(checkCode)) {
// When the verification code is not entered or is different from the local verification code , Request forwarding There is no need to add the item name for forwarding
request.setAttribute("errMsg", " The verification code is wrong ");
request.getRequestDispatcher("/register.jsp").forward(request, response);
return;
}
// Encapsulated data , Call the business layer to process business
User user = new User();
// Get all properties
Map<String, String[]> map = request.getParameterMap();
// obtain javabean
try {
// Encapsulate data into javaBean in
BeanUtils.populate(user, map);
} catch (Exception e) {
e.printStackTrace();
}
// The second step : Package hobbies separately
String[] hobby = request.getParameterValues("hobby");
String temp = "";
for (String s : hobby) {
temp = temp + "," + s;
}
// Remove the starting comma
temp = temp.substring(1);
user.setHobby(temp);
System.out.println(user);
// The third step : call service Layer handles business
ServiceUser sUser = new ServiceUserCheck();
// Receive the returned value
int i = sUser.register(user);
// Process the returned value
if (i == 1) {
// On behalf of successful registration , Jump to the success page
// Jump requires project name
response.sendRedirect(request.getContextPath() + "/welcome.jsp");
return;
} else if (i == 0) {
// Representative registration failed , User name already exists
// Prompt information
request.setAttribute("errMsg", " The user name has been registered ");
request.getRequestDispatcher("/register.jsp").forward(request, response);
return;
} else {
// It means there is an exception
request.setAttribute("errMsg", " server is busy , Please try again later ");
request.getRequestDispatcher("/register.jsp").forward(request, response);
return;
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// call doGet Method
doGet(request, response);
}
}
11. Sign in service
package com.yynh.service;
import com.yynh.dao.UserDao;
import com.yynh.dao.UserDaoReg;
import com.yynh.domain.User;
public class ServiceLogin implements ServiceUser {
@Override
public int register(User user) {
// TODO Auto-generated method stub
return 0;
}
@Override
public int loginUser(User user) {
UserDao ud = new UserDaoReg();
int i = ud.login(user);
if (i == 1) {
// Represents a successful login
return 1;
} else {
return i;
}
}
}
package com.yynh.service;
import com.yynh.dao.UserDao;
import com.yynh.dao.UserDaoReg;
import com.yynh.domain.User;
/**
* @author yynh_
* @ Register for business
*/
public class ServiceUserCheck implements ServiceUser {
public int register(User user) {
UserDao ud = new UserDaoReg();
// Determine whether the user name has been registered
int i = ud.findUser(user.getName());
if (i == 1) {
// Representatives can register users
// Encrypted password There is no way to login after encryption
// String pwd = MD5Utils.getPwd(user.getPassword());
// Store the encrypted results in user in
// user.setPassword(pwd);
// Registered successfully
return ud.registerUser(user);
} else {
// Represents that the user name already exists or there is an exception
return i;
}
}
public int loginUser(User user) {
return 0;
}
}
13. dao layer
package com.yynh.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import com.yynh.domain.User;
import com.yynh.utils.JDBCUtils;
public class UserDaoReg implements UserDao {
// The user login
public int login(User user) {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
// Get the connection
conn = JDBCUtils.getCon();
String sql = "select * from user where name=? and password=?";
// Get send sql object
stmt = conn.prepareStatement(sql);
// Set properties
stmt.setString(1, user.getName());
stmt.setString(2, user.getPassword());
// send out sql, Accept return value
rs = stmt.executeQuery();
if (rs.next()) {
// The password and user name are correct , You can log in.
return 1;
} else {
// Represents incorrect
return 0;
}
} catch (Exception e) {
e.printStackTrace();
return -1;
} finally {
JDBCUtils.release(conn, rs, stmt);
}
}
// Registered users
public int registerUser(User user) {
Connection conn = null;
PreparedStatement stmt = null;
try {
// Get the connection
conn = JDBCUtils.getCon();
String sql = "insert into user values(null,?,?,?,?,?,?,?,?,?)";
// Get send sql object
stmt = conn.prepareStatement(sql);
// Set properties
stmt.setString(1, user.getName());
stmt.setString(2, user.getPassword());
stmt.setInt(3, user.getAge());
stmt.setString(4, user.getSex());
stmt.setString(5, user.getEmail());
stmt.setString(6, user.getHobby());
stmt.setString(7, user.getAddress());
stmt.setString(8, user.getDescription());
stmt.setDate(9, user.getBirthday());
stmt.executeUpdate();
return 1;
} catch (Exception e) {
e.printStackTrace();
return -1;
}
}
// Query whether the user name exists
public int findUser(String name) {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
// Get the connection
conn = JDBCUtils.getCon();
String sql = "select * from user where name=?";
// Get send sql object
stmt = conn.prepareStatement(sql);
// Set properties
stmt.setString(1, name);
// send out sql, Accept return value
rs = stmt.executeQuery();
if (rs.next()) {
// It means that there is a duplicate user name
return 0;
} else {
// No duplicate can be registered
return 1;
}
} catch (Exception e) {
e.printStackTrace();
return -1;
} finally {
JDBCUtils.release(conn, rs, stmt);
}
}
}
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