4.SpringMVC映射器和适配器配置(xml)

Posted on 2019-01-08 Edited on 2023-02-17 In SpringMVC

项目工程目录:

项目依赖包:

Vo: User

package com.course.vo;

public class User {

	private Integer id;
	private String name;
	private Integer age;
	
	public User() {
		super();
	}
	
	public User(Integer id, String name, Integer age) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
	}
	
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}	
}

Controller

package com.course.controller;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import com.course.vo.User;

public class UserController1 implements Controller {

	@Override
	public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
		List<User> userList = new ArrayList<>();
		User user;
		for (int i = 0; i < 10; i++) {
			user = new User(i, "name" + i, 10 + i);
			userList.add(user);
		}
		
		// 封装页面地址和发送到页面的数据
		ModelAndView modelAndView = new ModelAndView();
		
		// 相当于httpServletRequest.setAttribute();
		modelAndView.addObject("userList", userList);
		
		// 相当于httpServletRequest.getRequestDispatcher("WEB-INF/view/UserList.jsp").forward(httpServletRequest, httpServletResponse);
		modelAndView.setViewName("WEB-INF/view/UserList.jsp");
		
		return modelAndView;
	}
}

package com.course.controller;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.HttpRequestHandler;

import com.course.vo.User;

public class UserController2 implements HttpRequestHandler {

	@Override
	public void handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
		List<User> userList = new ArrayList<>();
		User user;
		for (int i = 0; i < 5; i++) {
			user = new User(i, "name" + i, 10 + i);
			userList.add(user);
		}
		
		// 封装页面地址和发送到页面的数据
		httpServletRequest.setAttribute("userList", userList);
		httpServletRequest.getRequestDispatcher("WEB-INF/view/UserList.jsp").forward(httpServletRequest, httpServletResponse);
		
	}
}

springmvc.xml

处理器映射器:

1.BeanNameUrlHandlerMapping: 把bean的名字做为url进行查找，也就是handler必须配置name属性。这样配置简单但是每一个Controller只能指向一个url

2.SimpleUrlHandlerMapping: 如果一个Controller要指向多个url，就必须使用SimpleUrlHandlerMapping

处理器适配器:

1.SimpleControllerHandlerAdapter: controller实现Controller接口

2.HttpRequestHandlerAdapter: controller实现HttpRequestHandler接口

<?xml version="1.0" encoding="UTF-8"?>

<!-- 头文件 -->
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
	    http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
		http://www.springframework.org/schema/mvc/spring-mvc.xsd">
		

	<!-- 
		配置控制器
		name属性: 其实就是页面请求过来的url
	 -->
	<bean id="userController1" name="/getUserList1.do" class="com.course.controller.UserController1"></bean>
	<bean id="userController2" name="/getUserList2.do" class="com.course.controller.UserController2"></bean>
	
	<!-- 
		配置控制器映射器
		有两个处理器映射器，这两个处理器映射器可以共存: 
		1:org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping把bean的名字做为url进行查找，也就是handler必须配置name属性
		2:org.springframework.web.servlet.handler.SimpleUrlHandlerMapping  里面可以配置属性
	 -->
	<!-- controller必须有name属性，通过name属性值查找对应的controller -->
	<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
	<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
		<property name="mappings">
			<props>
				<!-- 
					key: 页面请求的url
					value: controller的bean的id
				 -->
				<prop key="/getUserList10.do">userController1</prop>
				<prop key="/getUserList11.do">userController1</prop>
				<prop key="/getUserList20.do">userController2</prop>
				<prop key="/getUserList21.do">userController2</prop>
			</props>
		</property>
	</bean>
	
	<!-- 
		配置控制器适配器
		有两个处理器适配器，这两个处理器适配器可以共存: 
		1:org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter写的controller要实现Controller的接口
		2:org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter 写controler要实现HttpRequestHandler接口
	 -->
	<!-- controller实现Controller接口 -->
	<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
	<bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter"></bean>
	
	<!-- 配置视图解析器 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>
	
</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>01_springmvc_hello</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- 配置前端控制器 -->
  <servlet>
  	<servlet-name>springmvc</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	
  	<!-- 加载springmvc.xml -->
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:springmvc.xml</param-value>
  	</init-param>
  	
  	<!-- 启动加载 -->
  	<load-on-startup>1</load-on-startup>
  	
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>springmvc</servlet-name>
  	<url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
</web-app>

UserList.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<h1>User List</h1>
	<hr/>
	<table align="center" width="60%" border="1" cellspacing="5">
		<thead>
			<tr>
				<th>Id</th>
				<th>Name</th>
				<th>Age</th>
			<tr>
		</thead>
		<tbody>
			<c:forEach var="user" items="${userList}">
				<tr>
					<td>${user.id}</td>
					<td>${user.name}</td>
					<td>${user.age}</td>
				</tr>
			</c:forEach>
		</tbody>
	</table>
</body>
</html>

log4j.properties

# Global logging configuration
log4j.rootLogger=INFO, stdout
# MyBatis logging configuration...
log4j.logger.org.mybatis.example.BlogMapper=TRACE
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

启动Tomcat

浏览器访问:

1
2
3

http://localhost:8080/01_springmvc_init/getUserList1.do
http://localhost:8080/01_springmvc_init/getUserList10.do
http://localhost:8080/01_springmvc_init/getUserList11.do

浏览器访问:

1
2
3

http://localhost:8080/01_springmvc_init/getUserList2.do
http://localhost:8080/01_springmvc_init/getUserList20.do
http://localhost:8080/01_springmvc_init/getUserList21.do