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Simple custom MVC optimization
2022-06-30 03:05:00 【An Li Jiu Ge】
Preface
This article follows an article , The last article shared a simple customization MVC. This article is about sharing customization MVC Optimize .
One 、 The central controller dynamically loads and stores the sub controller
We customize MVC Finally, export it to jar package , What if we add a sub controller , Du Daocheng jar package .
Here we will use the content shared before XML.
Through the previous modeling, we can know ,configModel The object will contain config.xml All sub controller information in
At the same time, in order to solve the problem that the central controller can dynamically load and save the information of sub controllers , We just need to introduce configModel Object can
DispatcherServlet
package com.zhw.framework;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.zhw.web.BookAction;
import com.zhw.xml.ActionModel;
import com.zhw.xml.ConfigModel;
import com.zhw.xml.ConfigModelFactory;
//@WebServlet("*.action")
public class DispatcherServlet extends HttpServlet{
// private Map<String,Action> actions = new HashMap<String,Action>();
private ConfigModel configModel;
/*
* Through the previous modeling, we can know ,configModel The object will contain config.xml All sub controller information in
* At the same time, in order to solve the problem that the central controller can dynamically load and save the information of sub controllers , We just need to introduce configModel Object can
*/
@Override
public void init() throws ServletException {
// actions.put("/book",new BookAction());
// actions.put("/order",new BookAction());
try {
configModel = ConfigModelFactory.bulid();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//http://localhost:8080/mvc/book.action?methodName=list
String uri = req.getRequestURI();
uri = uri.substring(uri.lastIndexOf("/"), uri.lastIndexOf("."));
// Action action = actions.get(uri);
// action.execute(req, resp);
//
ActionModel actionModel = configModel.pop(uri);
if(actionModel == null) {
throw new RuntimeException("action Configuration error ");
}
// yes action Full pathname of the sub controller
String type = actionModel.getType();
try {
// Class class is the beginning of reflection , Through the full pathname of the sub controller, use newInstance Method to get the sub controller .
Action action = (Action) Class.forName(type).newInstance();
} catch (Exception e) {
e.printStackTrace();
}
}
}
config.xml
<?xml version="1.0" encoding="UTF-8"?>
<config>
<action path="/book" type="com.zhw.web.BookAction">
<forward name="failed" path="/login.jsp" redirect="false" />
<forward name="success" path="/main.jsp" redirect="true" />
</action>
</config>ConfigModel
package com.zhw.xml;
import java.util.HashMap;
import java.util.Map;
/**
* Corresponding label
* @author zhw
*
*/
public class ConfigModel {
private Map<String,ActionModel> aMap = new HashMap<String,ActionModel>();
public void push(ActionModel actionModel) {
aMap.put(actionModel.getPath(), actionModel);
}
public ActionModel pop(String path) {
return aMap.get(path);
}
}
ConfigModelFactory
package com.zhw.xml;
import java.io.InputStream;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
/**
* 23 Factory mode of design mode
* sessionfactory
*
* @author zhw
*
*/
public class ConfigModelFactory {
public static ConfigModel bulid() throws Exception {
String defaultPath = "/config.xml";
InputStream in = ConfigModelFactory.class.getResourceAsStream(defaultPath);
SAXReader s = new SAXReader();
Document doc = s.read(in);
ConfigModel configModel = new ConfigModel();
List<Element> actionEles = doc.selectNodes("/config/action");
for (Element ele : actionEles) {
ActionModel actionModel = new ActionModel();
actionModel.setPath(ele.attributeValue("path"));
actionModel.setType(ele.attributeValue("type"));
// take forwardModel Assign and add to ActionModel
List<Element> forwardEles = ele.selectNodes("forward");
for (Element fele : forwardEles) {
ForwardModel forwardModel = new ForwardModel();
forwardModel.setName(fele.attributeValue("name"));
forwardModel.setPath(fele.attributeValue("path"));
forwardModel.setRedirect("true".equals(fele.attributeValue("redirect")));
actionModel.push(forwardModel);
}
configModel.push(actionModel);
}
return configModel;
}
}
Run after optimization ：
Two 、 Parameter passing encapsulation
Suppose we need to add a new book , What needs to be transferred is the book number , Book name , Book price . Three parameters , Very convenient , But if you need to pass 30 parameters ？ For this question , Encapsulate parameter passing
Before optimization ：
Demo
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h3> At present, the method of adding, deleting, modifying and checking </h3>
<a href="${pageContext.request.contextPath }/book/add"> increase </a>
<a href="${pageContext.request.contextPath }/book/del"> Delete </a>
<a href="${pageContext.request.contextPath }/book/edit"> modify </a>
<a href="${pageContext.request.contextPath }/book/list"> Inquire about </a>
<!-- r
The above problems ：
1、 About a single entity / The more table operation scenarios , The more classes you need to create , As a result, the number of classes in the project is too large
2、 When new business is added , In addition to adding the method corresponding to the business （load）, At the same time, the original method should be changed
3、 Reflection related code 、 In each entity class corresponding to Servlet There's always
4、 every last Servlets There are doget、dopost
-->
<h3> Optimization of problems with too many classes </h3>
<a href="${pageContext.request.contextPath }/book.action?methodName=add"> increase </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=del"> Delete </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=edit"> modify </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=list"> Inquire about </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=load"> The echo </a>
<h3> Order class CRUD</h3>
<a href="${pageContext.request.contextPath }/order.action?methodName=add"> increase </a>
<a href="${pageContext.request.contextPath }/order.action?methodName=del"> Delete </a>
<a href="${pageContext.request.contextPath }/order.action?methodName=edit"> modify </a>
<a href="${pageContext.request.contextPath }/order.action?methodName=list"> Inquire about </a>
<a href="${pageContext.request.contextPath }/order.action?methodName=load"> The echo </a>
<h3>xx</h3>
<a href="${pageContext.request.contextPath }/book.action?methodName=add&bid=123&bname=logo&price=99"> increase </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=del"> Delete </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=edit"> modify </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=list"> Inquire about </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=load"> The echo </a>
</body>
</html>BookAction
package com.zhw.web;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.zhw.entity.Book;
import com.zhw.framework.ActionSupport;
public class BookAction extends ActionSupport{
private void list(HttpServletRequest req, HttpServletResponse resp) {
System.out.println(" In the same Servlet Call in list Method ");
}
private void edit(HttpServletRequest req, HttpServletResponse resp) {
System.out.println(" In the same Servlet Call in edit Method ");
}
private void del(HttpServletRequest req, HttpServletResponse resp) {
System.out.println(" In the same Servlet Call in del Method ");
}
private void add(HttpServletRequest req, HttpServletResponse resp) {
String bid = req.getParameter("bid");
String bname = req.getParameter("bname");
String price = req.getParameter("price");
Book book = new Book();
book.setBid(Integer.valueOf(bid));
book.setBname(bname);
book.setPrice(Float.valueOf(price));
System.out.println(" In the same Servlet Call in add Method ");
}
private void load(HttpServletRequest req, HttpServletResponse resp) {
System.out.println(" In the same Servlet Call in load Method ");
}
}
Book
package com.zhw.entity;
public class Book {
private int bid;
private String bname;
private float price;
public int getBid() {
return bid;
}
public void setBid(int bid) {
this.bid = bid;
}
public String getBname() {
return bname;
}
public void setBname(String bname) {
this.bname = bname;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public Book() {
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "Book [bid=" + bid + ", bname=" + bname + ", price=" + price + "]";
}
}
After optimization ：
DispatcherServlet
package com.zhw.framework;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.beanutils.BeanUtils;
import com.zhw.web.BookAction;
import com.zhw.xml.ActionModel;
import com.zhw.xml.ConfigModel;
import com.zhw.xml.ConfigModelFactory;
import com.zhw.xml.ForwardModel;
//@WebServlet("*.action")
public class DispatcherServlet extends HttpServlet{
// private Map<String,Action> actions = new HashMap<String,Action>();
private ConfigModel configModel;
/*
* Through the previous modeling, we can know ,configModel The object will contain config.xml All sub controller information in
* At the same time, in order to solve the problem that the central controller can dynamically load and save the information of sub controllers , We just need to introduce configModel Object can
*/
@Override
public void init() throws ServletException {
// actions.put("/book",new BookAction());
// actions.put("/order",new BookAction());
try {
String configLocation = this.getInitParameter("configLocation");
if(configLocation == null ||"".equals(configLocation)) {
}
configModel = ConfigModelFactory.bulid();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//http://localhost:8080/mvc/book.action?methodName=list
String uri = req.getRequestURI();
uri = uri.substring(uri.lastIndexOf("/"), uri.lastIndexOf("."));
// Action action = actions.get(uri);
// action.execute(req, resp);
//
ActionModel actionModel = configModel.pop(uri);
if(actionModel == null) {
throw new RuntimeException("action Configuration error ");
}
// yes action Full pathname of the sub controller
String type = actionModel.getType();
try {
// Class class is the beginning of reflection , Through the full pathname of the sub controller, use newInstance Method to get the sub controller .
Action action = (Action) Class.forName(type).newInstance();
if(action instanceof ModelDriven) {
ModelDriven md = (ModelDriven)action;
Object model = md.getModel();
// Encapsulate all front-end parameter values into entity classes
BeanUtils.populate(model, req.getParameterMap());
}
// Formal call and release ,book The attributes in the are assigned
// action.execute(req, resp);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Demo
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h3> Optimization of parameter passing encapsulation </h3>
<a href="${pageContext.request.contextPath }/book.action?methodName=add&bid=989898&bname=laoliu&price=89"> increase </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=del"> Delete </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=edit"> modify </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=list"> Inquire about </a>
<a href="${pageContext.request.contextPath }/book.action?methodName=load"> The echo </a>
</body>
</html>BookAction
package com.zhw.web;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.zhw.entity.Book;
import com.zhw.framework.ActionSupport;
import com.zhw.framework.ModelDriven;
public class BookAction extends ActionSupport implements ModelDriven<Book>{
private Book book = new Book();
private String list(HttpServletRequest req, HttpServletResponse resp) {
System.out.println(" In the same Servlet Call in list Method ");
return "success";
}
private void edit(HttpServletRequest req, HttpServletResponse resp) {
System.out.println(" In the same Servlet Call in edit Method ");
}
private void del(HttpServletRequest req, HttpServletResponse resp) {
System.out.println(" In the same Servlet Call in del Method ");
}
private String add(HttpServletRequest req, HttpServletResponse resp) {
// String bid = req.getParameter("bid");
// String bname = req.getParameter("bname");
// String price = req.getParameter("price");
// Book book = new Book();
// book.setBid(Integer.valueOf(bid));
// book.setBname(bname);
// book.setPrice(Float.valueOf(price));
System.out.println(" In the same Servlet Call in add Method ");
return "failed";
}
private void load(HttpServletRequest req, HttpServletResponse resp) {
System.out.println(" In the same Servlet Call in load Method ");
}
@Override
public Book getModel() {
return book;
}
}
3、 ... and 、 Method to perform result optimization
Optimize the execution results of the method , If the addition is successful, use forwarding , If you fail, redirect .
DispatcherServlet
package com.zhw.framework;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.beanutils.BeanUtils;
import com.zhw.web.BookAction;
import com.zhw.xml.ActionModel;
import com.zhw.xml.ConfigModel;
import com.zhw.xml.ConfigModelFactory;
import com.zhw.xml.ForwardModel;
//@WebServlet("*.action")
public class DispatcherServlet extends HttpServlet{
// private Map<String,Action> actions = new HashMap<String,Action>();
private ConfigModel configModel;
/*
* Through the previous modeling, we can know ,configModel The object will contain config.xml All sub controller information in
* At the same time, in order to solve the problem that the central controller can dynamically load and save the information of sub controllers , We just need to introduce configModel Object can
*/
@Override
public void init() throws ServletException {
// actions.put("/book",new BookAction());
// actions.put("/order",new BookAction());
try {
String configLocation = this.getInitParameter("configLocation");
if(configLocation == null ||"".equals(configLocation)) {
}
configModel = ConfigModelFactory.bulid();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//http://localhost:8080/mvc/book.action?methodName=list
String uri = req.getRequestURI();
uri = uri.substring(uri.lastIndexOf("/"), uri.lastIndexOf("."));
// Action action = actions.get(uri);
// action.execute(req, resp);
//
ActionModel actionModel = configModel.pop(uri);
if(actionModel == null) {
throw new RuntimeException("action Configuration error ");
}
// yes action Full pathname of the sub controller
String type = actionModel.getType();
try {
// Class class is the beginning of reflection , Through the full pathname of the sub controller, use newInstance Method to get the sub controller .
Action action = (Action) Class.forName(type).newInstance();
if(action instanceof ModelDriven) {
ModelDriven md = (ModelDriven)action;
Object model = md.getModel();
// Encapsulate all front-end parameter values into entity classes
BeanUtils.populate(model, req.getParameterMap());
}
// Formal call and release ,book The attributes in the are assigned
action.execute(req, resp);
String result = action.execute(req, resp);
ForwardModel forwardModel = actionModel.pop(result);
boolean redirect = forwardModel.isRedirect();
if(forwardModel == null) {
throw new RuntimeException("forward config error");
}
String path = forwardModel.getPath();
if(redirect)
resp.sendRedirect(req.getServletContext().getContextPath()+path);
else
req.getRequestDispatcher(path).forward(req, resp);
} catch (Exception e) {
e.printStackTrace();
}
}
}
xml
<?xml version="1.0" encoding="UTF-8"?>
<config>
<action path="/book" type="com.zhw.web.BookAction">
<forward name="success" path="/Demo2.jsp" redirect="false" />
<forward name="failed" path="/Demo3.jsp" redirect="true" />
</action>
</config>forwardModel
package com.zhw.xml;
/**
* @author zhw
*
*/
public class ForwardModel {
// <forward name="failed" path="/reg.jsp" redirect="false" />
private String name;
private String path;
private Boolean redirect;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
public Boolean getRedirect() {
return redirect;
}
public void setRedirect(Boolean redirect) {
this.redirect = redirect;
}
public boolean isRedirect() {
return redirect;
}
}
Four 、 The framework configuration file is variable
DispatcherServlet
package com.zhw.framework;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.beanutils.BeanUtils;
import com.zhw.web.BookAction;
import com.zhw.xml.ActionModel;
import com.zhw.xml.ConfigModel;
import com.zhw.xml.ConfigModelFactory;
import com.zhw.xml.ForwardModel;
//@WebServlet("*.action")
public class DispatcherServlet extends HttpServlet{
// private Map<String,Action> actions = new HashMap<String,Action>();
private ConfigModel configModel;
/*
* Through the previous modeling, we can know ,configModel The object will contain config.xml All sub controller information in
* At the same time, in order to solve the problem that the central controller can dynamically load and save the information of sub controllers , We just need to introduce configModel Object can
*/
@Override
public void init() throws ServletException {
// actions.put("/book",new BookAction());
// actions.put("/order",new BookAction());
try {
String configLocation = this.getInitParameter("configLocation");
if(configLocation == null ||"".equals(configLocation)) {
}
configModel = ConfigModelFactory.bulid();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//http://localhost:8080/mvc/book.action?methodName=list
String uri = req.getRequestURI();
uri = uri.substring(uri.lastIndexOf("/"), uri.lastIndexOf("."));
// Action action = actions.get(uri);
// action.execute(req, resp);
//
ActionModel actionModel = configModel.pop(uri);
if(actionModel == null) {
throw new RuntimeException("action Configuration error ");
}
// yes action Full pathname of the sub controller
String type = actionModel.getType();
try {
// Class class is the beginning of reflection , Through the full pathname of the sub controller, use newInstance Method to get the sub controller .
Action action = (Action) Class.forName(type).newInstance();
if(action instanceof ModelDriven) {
ModelDriven md = (ModelDriven)action;
Object model = md.getModel();
// Encapsulate all front-end parameter values into entity classes
BeanUtils.populate(model, req.getParameterMap());
}
// Formal call and release ,book The attributes in the are assigned
action.execute(req, resp);
String result = action.execute(req, resp);
ForwardModel forwardModel = actionModel.pop(result);
boolean redirect = forwardModel.isRedirect();
if(forwardModel == null) {
throw new RuntimeException("forward config error");
}
String path = forwardModel.getPath();
if(redirect)
resp.sendRedirect(req.getServletContext().getContextPath()+path);
else
req.getRequestDispatcher(path).forward(req, resp);
} catch (Exception e) {
e.printStackTrace();
}
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>ss</display-name>
<servlet>
<servlet-name>mvc</servlet-name>
<servlet-class>com.zhw.framework.DispatcherServlet</servlet-class>
<init-param>
<param-name>configLocation</param-name>
<param-value>laoliu</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>mvc</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
</web-app>take config.xml Change it to laoliu.xml
summary
In the last simple customization mvc after , We optimized this , After optimization, the amount of code is reduced , Shorten development time .
The content of this time is shared here . If there is a mistake , I hope you can correct me. .
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