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Department project source code sharing
2022-08-01 23:11:00 【Native Javanese, JOElib】
Department project source code sharing
Code logic mind map
链接：https://pan.baidu.com/s/10Dzu46UOsp7nHmk40gIn_Q?pwd=2t6m
提取码：2t6m
–来自百度网盘超级会员V2的分享
源码分享
后期会根据AJAX和JQuery继续完善,And the site's robustness is not strong,There will be thread safety problems and the situation that the website cannot be jumped when encountering a primary key conflict,It will be improved one by one later
package bean;
import java.io.Serializable;
import java.util.Objects;
/** * @className: bean.Dept * @description: * @author: 江骏杰 * @create: 2022-07-23 20:40 */
public class Dept implements Serializable {
public static final long serialVersionUID = 100L;
private int id;
private int deptNo;
private String deptName;
private String deptLoc;
public Dept(int id, String deptLoc) {
this.id = id;
this.deptLoc = deptLoc;
}
public Dept() {
}
public Dept(int id, int deptNo, String deptName, String deptLoc) {
this.id = id;
this.deptNo = deptNo;
this.deptName = deptName;
this.deptLoc = deptLoc;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getDeptNo() {
return deptNo;
}
public void setDeptNo(int deptNo) {
this.deptNo = deptNo;
}
public String getDeptName() {
return deptName;
}
public void setDeptName(String deptName) {
this.deptName = deptName;
}
public String getDeptLoc() {
return deptLoc;
}
public void setDeptLoc(String deptLoc) {
this.deptLoc = deptLoc;
}
@Override
public String toString() {
return "Dept{" +
"id=" + id +
", deptNo=" + deptNo +
", deptName='" + deptName + '\'' +
", deptLoc='" + deptLoc + '\'' +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Dept dept = (Dept) o;
return id == dept.id && deptNo == dept.deptNo && Objects.equals(deptName, dept.deptName) && Objects.equals(deptLoc, dept.deptLoc);
}
@Override
public int hashCode() {
return Objects.hash(id, deptNo, deptName, deptLoc);
}
}
package bean;
import jakarta.servlet.ServletContext;
import jakarta.servlet.http.HttpSessionBindingEvent;
import jakarta.servlet.http.HttpSessionBindingListener;
import java.io.Serializable;
/**
* @className: bean.User
* @description:
* @author: 江骏杰
* @create: 2022-07-30 17:34
*/
public class User implements HttpSessionBindingListener, Serializable {
private String username;
private String userpwd;
public User(String username, String userpwd) {
this.username = username;
this.userpwd = userpwd;
}
public User() {
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getUserpwd() {
return userpwd;
}
public void setUserpwd(String userpwd) {
this.userpwd = userpwd;
}
@Override
public void valueBound(HttpSessionBindingEvent event) {
ServletContext application = event.getSession().getServletContext();
Object count = application.getAttribute("count");
if (count != null) {
int afCount = (Integer) count;
afCount++;
application.setAttribute("count",afCount);
}else {
application.setAttribute("count",1);
}
}
@Override
public void valueUnbound(HttpSessionBindingEvent event) {
ServletContext application = event.getSession().getServletContext();
int count = (Integer)application.getAttribute("count");
count--;
application.setAttribute("count", count);
}
}
package servlet;
import bean.Dept;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import util.DBUtil;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
/**
* @className: servlet.DeptServlet
* @description:
* @author: 江骏杰
* @create: 2022-07-23 20:37
*/
@WebServlet({"/dept/list", "/dept/detail", "/dept/modify", "/dept/add", "/dept/del"})
public class DeptServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String requestServletPath = request.getServletPath();
if ("/dept/list".equals(requestServletPath)) {
doList(request, response);
}else if ("/dept/detail".equals(requestServletPath)) {
doDetail(request, response);
}else if ("/dept/modify".equals(requestServletPath)) {
doModify(request, response);
}else if ("/dept/add".equals(requestServletPath)) {
doAdd(request, response);
}else if ("/dept/del".equals(requestServletPath)) {
doDel(request, response);
}
}
private void doDel(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String id = request.getParameter("id");
Connection conn = null;
PreparedStatement ps = null;
int update = 0;
try {
conn = DBUtil.getConnection();
String sql = "DELETE FROM dept WHERE id = ?";
ps = conn.prepareStatement(sql);
ps.setString(1,id);
update = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(conn,ps);
}
if (update == 1) {
response.sendRedirect(request.getContextPath() + "/dept/list");
}
}
private void doAdd(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String deptName = request.getParameter("dept_name");
String deptNo = request.getParameter("dept_no");
String deptLoc = request.getParameter("dept_loc");
Connection conn = null;
PreparedStatement ps = null;
int update = 0;
try {
conn = DBUtil.getConnection();
String sql = "INSERT INTO dept(dept_name,dept_no,dept_loc) VALUES(?,?,?)";
ps = conn.prepareStatement(sql);
ps.setString(1,deptName);
ps.setString(2,deptNo);
ps.setString(3,deptLoc);
update = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(conn,ps);
}
if (update == 1) {
response.sendRedirect(request.getContextPath() + "/dept/list");
}
}
private void doModify(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException{
String id = request.getParameter("id");
String deptName = request.getParameter("dept_name");
String deptNo = request.getParameter("dept_no");
String deptLoc = request.getParameter("dept_loc");
Connection conn = null;
PreparedStatement ps = null;
int update = 0;
try {
conn = DBUtil.getConnection();
String sql = "UPDATE dept SET dept_name = ?, dept_no = ?, dept_loc = ? WHERE id = ?";
ps = conn.prepareStatement(sql);
ps.setString(1,deptName);
ps.setString(2,deptNo);
ps.setString(3,deptLoc);
ps.setString(4,id);
update = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(conn,ps);
}
if (update == 1) {
response.sendRedirect(request.getContextPath() + "/dept/list");
}
}
private void doDetail(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String id = request.getParameter("id");
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
Dept dept = null;
try {
conn = DBUtil.getConnection();
String sql = "SELECT dept_no,dept_name,dept_loc FROM dept WHERE id = ?";
ps = conn.prepareStatement(sql);
ps.setString(1,id);
rs = ps.executeQuery();
if (rs.next()) {
int deptNo = rs.getInt(1);
String deptName = rs.getString(2);
String deptLoc = rs.getString(3);
dept = new Dept(Integer.parseInt(id), deptNo, deptName, deptLoc);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(conn,ps,rs);
}
request.setAttribute("deOne",dept);
request.getRequestDispatcher("/" + request.getParameter("f") + ".jsp").forward(request, response);
}
private void doList(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
List<Dept> list = new ArrayList<>();
try {
conn = DBUtil.getConnection();
String sql = "SELECT id,dept_loc FROM dept";
ps = conn.prepareStatement(sql);
rs = ps.executeQuery();
while (rs.next()) {
int id = rs.getInt(1);
String deptLoc = rs.getString(2);
Dept dept = new Dept(id, deptLoc);
list.add(dept);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(conn,ps,rs);
}
request.setAttribute("depts",list);
request.getRequestDispatcher("/list.jsp").forward(request, response);
}
}
package servlet;
import bean.User;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import java.io.IOException;
/**
* @className: servlet.ThingFilter
* @description:
* @author: 江骏杰
* @create: 2022-07-30 17:29
*/
public class ThingFilter implements Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) resp;
HttpSession session = request.getSession(false);
if (session != null && session.getAttribute("user") != null) {
chain.doFilter(request, response);
} else {
response.sendRedirect(request.getContextPath());
}
}
}
package servlet;
import bean.User;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.*;
import util.DBUtil;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* @className: bean.UserServlet
* @description:
* @author: 江骏杰
* @create: 2022-07-25 18:11
*/
@WebServlet({"/user/login","/user/logout"})
public class UserServlet extends HttpServlet {
// 升级方向
// 数据表 -> 前端页面(页面流转) -> servlet完成 -> 错误页面 -> session机制 -> 安全退出
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String servletPath = request.getServletPath();
if ("/user/login".equals(servletPath)) {
doLogin(request, response);
}else if ("/user/logout".equals(servletPath)) {
doLogout(request, response);
}
}
private void doLogout(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException{
HttpSession session = request.getSession(false);
session.invalidate();
Cookie username = new Cookie("username", "");
Cookie userpwd = new Cookie("userpwd", "");
username.setPath(request.getContextPath());
userpwd.setPath(request.getContextPath());
username.setMaxAge(0);
userpwd.setMaxAge(0);
response.addCookie(username);
response.addCookie(userpwd);
response.sendRedirect(request.getContextPath());
}
private void doLogin(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 1.获取信息
String username = request.getParameter("username");
String userpwd = request.getParameter("userpwd");
// 2.连接数据库
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
String path = null;
boolean login = false;
try {
conn = DBUtil.getConnection();
String sql = "SELECT * FROM user WHERE username = ? AND userpwd = ?";
ps = conn.prepareStatement(sql);
ps.setString(1,username);
ps.setString(2,userpwd);
rs = ps.executeQuery();
login = rs.next();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(conn,ps,rs);
}
// 判断是否登录成功
if (login) {
path = "/dept/list";
HttpSession session = request.getSession();
User user = new User(username,userpwd);
session.setAttribute("user",user);
if ("true".equals(request.getParameter("pass"))) {
Cookie username1 = new Cookie("username", username);
Cookie userpwd1 = new Cookie("userpwd", userpwd);
username1.setMaxAge(60);
userpwd1.setMaxAge(60);
username1.setPath(request.getContextPath());
userpwd1.setPath(request.getContextPath());
response.addCookie(username1);
response.addCookie(userpwd1);
}
}else {
path = "/error.jsp";
}
response.sendRedirect(request.getContextPath() + path);
}
}
package servlet;
import bean.User;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.*;
import util.DBUtil;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* @className: bean.WelcomeServlet
* @description:
* @author: 江骏杰
* @create: 2022-07-25 21:49
*/
@WebServlet("/welcome")
public class WelcomeServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Cookie[] cookies = request.getCookies();
String username = null;
String userpwd = null;
if (cookies != null) {
for (Cookie cookie : cookies) {
if ("username".equals(cookie.getName())) {
username = cookie.getValue();
}else if ("userpwd".equals(cookie.getName())) {
userpwd = cookie.getValue();
}
}
}
if (username != null && userpwd != null) {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
boolean login = false;
try {
conn = DBUtil.getConnection();
String sql = "SELECT * FROM user WHERE username = ? AND userpwd = ?";
ps = conn.prepareStatement(sql);
ps.setString(1, username);
ps.setString(2, userpwd);
rs = ps.executeQuery();
login = rs.next();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(conn, ps, rs);
}
if (login) {
HttpSession session = request.getSession();
User user = new User(username,userpwd);
session.setAttribute("user",user);
response.sendRedirect(request.getContextPath() + "/dept/list");
}
}else {
response.sendRedirect(request.getContextPath() + "/index.jsp");
}
}
}
package util;
import javax.sql.DataSource;
import java.sql.*;
/**
* @className: util.DBUtil
* @description:
* @author: 江骏杰
* @create: 2022-07-17 23:12
*/
public class DBUtil {
public static DataSource dataSource = null;
static {
try {
Class.forName("com.mysql.cj.jdbc.Driver");
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
public static Connection getConnection() throws SQLException {
return DriverManager.getConnection("jdbc:mysql://43.142.25.180:3306/dep_db","root","Hello_world_123!!~~~");
}
public static void close(Connection conn, Statement statement) {
try {
if (statement != null)
statement.close();
if (conn != null)
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void close(Connection conn, Statement statement, ResultSet resultSet) {
try {
// 先关小的
if (resultSet != null)
resultSet.close();
if (statement != null)
statement.close();
if (conn != null)
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd" version="5.0">
<welcome-file-list>
<welcome-file>welcome</welcome-file>
</welcome-file-list>
<filter>
<filter-name>thing</filter-name>
<filter-class>servlet.ThingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>thing</filter-name>
<url-pattern>/dept/*</url-pattern>
</filter-mapping>
</web-app>
<%--
Created by IntelliJ IDEA.
User: asus
Date: 2022/7/23
Time: 20:17
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>添加数据页面</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/dept/add" method="post">
部门编号:<input type="text" name="dept_no"><br>
部门名称:<input type="text" name="dept_name"><br>
部门地址:<input type="text" name="dept_loc"><br>
<input type="submit" value="确认添加">
</form>
</body>
</html>
<%@ page import="bean.Dept" %><%--
Created by IntelliJ IDEA.
User: asus
Date: 2022/7/23
Time: 20:26
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>详情页面</title>
</head>
<body>
<hr>
编号: ${deOne.id}
部门编号:${deOne.deptNo}
部门名字:${deOne.deptName}
部门地址:${deOne.deptLoc}
<hr>
<center><a href="${pageContext.request.contextPath}/dept/list">返回</a></center>
</body>
</html>
<%--
Created by IntelliJ IDEA.
User: asus
Date: 2022/7/25
Time: 20:14
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>失败页面</title>
</head>
<body>
<h1 align="center">账号或密码错误,<a href="${pageContext.request.contextPath}">请重新登录</a></h1>
</body>
</html>
<%--
Created by IntelliJ IDEA.
User: asus
Date: 2022/7/23
Time: 20:08
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>后台页面</title>
</head>
<body>
<H1 ALIGN="center">Welcome to the backend page</H1>
<h2 align="center">登录</h2>
<hr>
<form action="${pageContext.request.contextPath}/user/login" method="post">
<center>用户名:<input type="text" name="username"></center><br>
<center>密码: <input type="password" name="userpwd"></center><br>
<center><input type="submit" value="登录"> 是否1Free login in minutes<input type="radio" name="pass" value="true"></center>
</form>
<hr>
</body>
</html>
<%@ page import="bean.Dept" %>
<%@ page import="java.util.ArrayList" %><%--
Created by IntelliJ IDEA.
User: asus
Date: 2022/7/23
Time: 20:10
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>列表页面</title>
<base href="${pageContext.request.scheme}://${pageContext.request.serverName}:${pageContext.request.serverPort}${pageContext.request.contextPath}/">
</head>
<body>
<script type="text/javascript">
del = function (id) {
if (window.confirm("亲,Really want to delete it,Deletion is irreversible!")) {
window.location.href = "${pageContext.request.contextPath}/dept/del?id=" + id;
}
}
</script>
<h3 align="center">欢迎${username}回来,当前在线人数:${count}</h3>
<table align="center">
<tr>
<th>记录编号</th>
<th>部门地址</th>
<th>操作</th>
</tr>
<c:forEach items="${depts}" var="dept">
<tr>
<td>${dept.id}</td>
<td>${dept.deptLoc}</td>
<td>
<a href="javascript:void(0)" οnclick="del(${dept.id})">删除数据</a>
<a href="dept/detail?id=${dept.id}&f=modify">修改数据</a>
<a href="dept/detail?id=${dept.id}&f=detail">数据详情</a>
</td>
</tr>
</c:forEach>
</table>
<center><a href="add.jsp">添加数据</a></center>
<center><a href="user/logout">安全退出</a></center>
</body>
</html>
<%@ page import="bean.Dept" %><%--
Created by IntelliJ IDEA.
User: asus
Date: 2022/7/23
Time: 20:22
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>修改页面</title>
</head>
<body>
<form action="<%=request.getContextPath()%>/dept/modify" method="post">
<input type="text" name="id" value="${deOne.id}" hidden>
部门编号:<input type="text" name="dept_no" value="${deOne.deptNo}" readonly><br>
部门名称:<input type="text" name="dept_name" value="${deOne.deptName}"><br>
部门地址:<input type="text" name="dept_loc" value="${deOne.deptLoc}"><br>
<input type="submit" value="确认修改">
</form>
</body>
</html>
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