Spring MVC系列[2]——参数传递及重定向

1.目录结构

　　

2.代码

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="2.5"
     xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
   <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:spring-mvc.xml</param-value>
       </init-param>
       <load-on-startup></load-on-startup>
   </servlet>

   <servlet-mapping>
       <servlet-name>springmvc</servlet-name>
       <url-pattern>*.do</url-pattern>
   </servlet-mapping>
 </web-app>

web.xml

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

 <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:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee"
     xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
     xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util"
     xmlns:jpa="http://www.springframework.org/schema/data/jpa" xsi:schemaLocation="
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
     http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
     http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-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/util http://www.springframework.org/schema/util/spring-util-3.2.xsd"> 

     <!-- 开启注解扫描 -->
     <context:component-scan base-package="com.java"/>

     <!-- 开启mvc注解扫描 -->
     <mvc:annotation-driven/>

     <!-- 定义视图解析器 -->
     <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
         <property name="prefix" value="/WEB-INF/"/>
         <property name="suffix" value=".jsp"/>
     </bean>

 </beans>

spring-mvc.xml

 package com.java.entity;

 public class User {
     private Integer userId;
     private String userName;
     private String password;

     public Integer getUserId() {
         return userId;
     }
     public void setUserId(Integer userId) {
         this.userId = userId;
     }
     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;
     }

 }

User

 package com.java.controller;

 import java.util.HashMap;
 import java.util.Map;

 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpSession;

 import org.springframework.stereotype.Controller;
 import org.springframework.ui.ModelMap;
 import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.view.RedirectView;

 import com.java.entity.User;

 @Controller
 @RequestMapping("/demo")
 public class HelloController {

     /**
      * 接收参数方式一：采用HttpServletRequest
      * @param request
      * @return
      */
     @RequestMapping("/test1.do")
     public String test1(HttpServletRequest request){
         String userName = request.getParameter("userName");
         String password = request.getParameter("password");

         System.out.println("userName:"+userName);
         System.out.println("password:"+password);

         return "jsp/success";
     }

     /**
      * 接收参数方式二：采用@RequestParam注解方式
      * @param userName
      * @param password
      * @return
      */
     @RequestMapping("/test2.do")
     public String test2(
             @RequestParam String userName,
             @RequestParam String password){
         System.out.println("userName:"+userName);
         System.out.println("password:"+password);
         return "jsp/success";
     }

     /**
      * 接收参数方式三：采用实体方式
      * 前提是： 被提交表单中name 和 实体中的属性完全一致
      * @param user
      * @return
      */
     @RequestMapping("/test3.do")
     public String test3(User user){
         System.out.println("userName:"+user.getuserName());
         System.out.println("password:"+user.getPassword());
         return "jsp/success";
     }

     ////////////////////////////////////////////////////////////
     /*以下是对【传出参数 的研究】*/

     /**
      * 传出参数方式一：使用ModelAndView传出参数
      */
     @RequestMapping("test4.do")
     public ModelAndView test4(){
         Map<String, Object> data = new HashMap<String, Object> ();
         data.put("success", true);
         data.put("message", "操作成功");
         return new ModelAndView("jsp/success",data);
     }

     /**
      * 传出参数方式二：使用ModelMap传出参数
      * @param map
      * @return
      */
     @RequestMapping("test5.do")
     public ModelAndView test5(ModelMap map){
         map.addAttribute("success", false);
         map.addAttribute("message", "操作失败");
         return new ModelAndView("jsp/success");
     }

     /**
      * 使用ModelAttribute传出实体属性值
      * ModelAttribute 会利用 HttpServletRequest 的 Attribute传递到JSP页面中。
      * @return
      */
     @ModelAttribute("age")
     public int getAge(){
         return 25;
     }

     /**
      * 传出参数方式三：使用ModelAttribute传出参数
      * 需要注意的是：@ModelAttribute括号里面的名字应该与表单name保持一致
      * @param userName
      * @param password
      * @return
      */
     @RequestMapping("/test6.do")
     public ModelAndView test6(
             @ModelAttribute("userName") String userName,
             @ModelAttribute("password") String password){

         return new ModelAndView("jsp/success");
     }

     ////////////////////////////////////////////////////////////
     /*以下是对【session  和  重定向  的研究】*/

     /**
      * session的使用
      * 可以利用session传递参数
      */
     @RequestMapping("test7.do")
     public ModelAndView test7(HttpServletRequest request){

         String userName = request.getParameter("userName");
         String password = request.getParameter("password");

         HttpSession session = request.getSession();

         session.setAttribute("sal", 8000);
         session.setAttribute("userName", userName);
         session.setAttribute("password", password);

         return new ModelAndView("jsp/success");
     }

     /**
      * 测试String
      * @param user
      * @param modelmap
      * @return
      */
     @RequestMapping("test8.do")
     public String test8(User user, ModelMap modelmap){
         modelmap.addAttribute("user", user);
         return "jsp/success";
     }

     /**
      * 返回错误页面
      * @return
      */
     @RequestMapping("test9.do")
     public String test9(){
         return "jsp/error";
     }

     /**
      * 重定向方式一：利用RedirectView重定向
      * @param user
      * @return
      */
     @RequestMapping("test10.do")
     public ModelAndView test10(User user){
         if(user.getuserName().equals("java")){
             return new ModelAndView("jsp/success");
         }
         return new ModelAndView(new RedirectView("test9.do"));
     }

     /**
      * 重定向方式二：利用redirect：前缀重定向
      * 结果和方式一完全一样
      * @param user
      * @return
      */
     @RequestMapping("test11.do")
     public String test11(User user){
         if("java".equals(user.getuserName())){
             return "jsp/success";
         }
         return "redirect:test9.do";
     }
 }

HelloController【重要】

 <%@ 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">
     -->
   </head>

   <body>
       <h2>测试</h2>
       <!--
       <a href="demo/test1.do">点击我试试</a>
       -->
       <hr>

     <form action="demo/test11.do" method="post">
         <label id="userName">用户名：</label><input type="text" name="userName"/><br/>
         <label id="password">密&nbsp;&nbsp;码：</label><input type="password" name="password"/><br/>
         <input type="submit" value="登录"/>
     </form>
   </body>
 </html>

index.jsp

 <%@ 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 'MyJsp.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">
     -->

   </head>

   <body>
        <h2>是否成功：${success}</h2>
        <h2>提示消息：${message}</h2>

        <hr/>

        <h2>年龄：${age}</h2>

        <h2>用户名：${userName}</h2>
        <h2>密码：${user.password}</h2>

        <h2>薪资：${sal}</h2>

        <h2>对象：${user.userName}</h2>
   </body>
 </html>

success.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=ISO-8859-1">
 <title>Insert title here</title>
 </head>
 <body>
     不好，页面被外星人劫持！
 </body>
 </html>

error.jsp

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