springMVC数据回显

1、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_2_5.xsd" id="WebApp_ID" version="2.5">
   <display-name>springmvc1</display-name>

   <filter>
     <filter-name>characterEncoding</filter-name>
     <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
     <init-param>
       <param-name>encoding</param-name>
       <param-value>UTF-8</param-value>
     </init-param>
   </filter>
   <filter-mapping>
     <filter-name>characterEncoding</filter-name>
     <url-pattern>/*</url-pattern>
   </filter-mapping>

   <servlet>
     <servlet-name>springmvc</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:springmvc.xml</param-value>
     </init-param>
   </servlet>
   <servlet-mapping>
     <servlet-name>springmvc</servlet-name>
     <url-pattern>*.do</url-pattern>
   </servlet-mapping>
   <!-- <servlet-mapping>
     <servlet-name>springmvc</servlet-name>
     <url-pattern>/rest/*</url-pattern>
   </servlet-mapping> -->

   <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>

 </web-app>

2、springmvc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:mvc="http://www.springframework.org/schema/mvc"
     xmlns:aop="http://www.springframework.org/schema/aop"
     xmlns:tx="http://www.springframework.org/schema/tx"
     xmlns:context="http://www.springframework.org/schema/context"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.springframework.org/schema/beans
                         http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
                         http://www.springframework.org/schema/mvc
                         http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
                         http://www.springframework.org/schema/context
                         http://www.springframework.org/schema/context/spring-context-3.2.xsd
                         http://www.springframework.org/schema/aop
                         http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
                         http://www.springframework.org/schema/tx
                         http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">

         <!-- 把Controller交给spring管理 -->
         <context:component-scan base-package="com.xiaostudy"/>

         <!-- <mvc:annotation-driven/> --><!-- 这个可以替代下面处理器映射器和处理器适配器，仅在注解情况下可用 -->

         <!-- 配置注解处理器映射器 功能：寻找执行类Controller -->
         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>

         <!-- 配置注解处理器适配器 功能：调用controller方法，执行controller -->
         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>

         <!-- 配置sprigmvc视图解析器：解析逻辑试图
              后台返回逻辑试图：index
             视图解析器解析出真正物理视图：前缀+逻辑试图+后缀====/WEB-INF/index.jsp -->
         <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
             <property name="prefix" value="/WEB-INF/"/>
             <property name="suffix" value=".jsp"/>
         </bean>
 </beans>

3、domain类

 package com.xiaostudy.domain;

 public class User {

     private int id;
     private String username;
     private String password;
     private int age;

     public int getId() {
         return id;
     }

     public void setId(int id) {
         this.id = id;
     }

     public String getUsername() {
         return username;
     }

     public void setUsername(String username) {
         this.username = username;
     }

     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;
     }

     @Override
     public String toString() {
         return "User [id=" + id + ", username=" + username + ", password=" + password + ", age=" + age + "]";
     }

 }

4、注解类

 package com.xiaostudy.controller;

 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RequestParam;

 import com.xiaostudy.domain.User;

 @Controller//<bean class="com.xiaostudy.controller.MyController"/>
 @RequestMapping(value="/myController")//访问该类的方法时，前面多这样一个路径
 public class MyController {

 //    @RequestMapping("hello")//http://localhost:8080/demo2/hello.do
 //    @RequestMapping("/hello")//http://localhost:8080/demo2/hello.do
 //    @RequestMapping(value="/hello.do")//http://localhost:8080/demo2/hello.do
 //    @RequestMapping(value="/hello.do",method=RequestMethod.GET)//http://localhost:8080/demo2/hello.do
 //    @RequestMapping(value="/hello.do",method= {RequestMethod.GET,RequestMethod.POST})//http://localhost:8080/demo2/hello.do
     public String print() {
         return "index";
     }

     @RequestMapping("hi")//http://localhost:8080/demo2/myController/hi.do
     public String hello() {
         return "index";
     }

     @RequestMapping("requestint")//http://localhost:8080/demo2/myController/requestint.do
     public String requestint(int id) {
         System.out.println(id);
         return "index";
     }

     @RequestMapping("requestint_2")//http://localhost:8080/demo2/myController/requestint2.do
     public String requestint_2(@RequestParam(value="id2",required=true)int id) {//value="id2"表示：更改参数别名，required=true表示：直接访问地址会报错，必须要转跳
         System.out.println(id);
         return "index";
     }

     @RequestMapping("requestint2")//http://localhost:8080/demo2/myController/requestint2.do
     public String requestint2(int id, int i) {
         System.out.println(id + "   " + i);
         return "index";
     }

     @RequestMapping("requestint3")//http://localhost:8080/demo2/myController/requestint3.do
     public String requestint3(User user) {
         System.out.println(user);
         return "index";
     }

     @RequestMapping("requestint4")//http://localhost:8080/demo2/myController/requestint4.do
     public String requestint4(CustomUser customUser) {
         System.out.println(customUser);
         return "index";
     }

     @RequestMapping("xiaostudy")//http://localhost:8080/demo2/myController/xiaostudy.do
     public String add() {
         return "xiaostudy";
     }

     @RequestMapping("ok")//http://localhost:8080/demo2/myController/ok.do
     public String ok(Model model) {//Model作用：用于回显数据
         User user = new User();
         user.setId(2);
         user.setUsername("xiaostudy");
         user.setPassword("123456");
         user.setAge(23);
         model.addAttribute("user", user);
         return "ok";
     }

     @RequestMapping("id/{id}")//http://localhost:8080/demo2/myController/id/？.do
     public String id(@PathVariable int id) {//@PathVariable：说明{id}是对参数的id
         System.out.println(id);
         return "index";
     }

     @RequestMapping("test")//http://localhost:8080/demo2/myController/test.do
     public String test() {
         return "forward:index";//转发
     }

     @RequestMapping("test2")//http://localhost:8080/demo2/myController/test2.do
     public String test2() {
         return "redirect:index";//重定向
     }

 }

5、回显数据jsp

 <%@ 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>springMVC_demo</title>
 </head>
 <body>
     ${user.id }||${user.username }||${user.password }||${user.age }<br/>
     <a href="${pageContext.request.contextPath }/myController/id/${user.id}.do">id</a><br/>
     <%-- <a href="${pageContext.request.contextPath }/rest/myController/id/${user.id}">id2</a><br/> --%>
 </body>
 </html>

项目文件结构

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