springMVC

 1 package net.liuzd.web.action;
 2 
 3 import javax.servlet.http.HttpServletRequest;
 4 import javax.servlet.http.HttpServletResponse;
 5 
 6 import net.liuzd.vo.User;
 7 
 8 import org.springframework.stereotype.Controller;
 9 import org.springframework.ui.Model;
10 import org.springframework.web.bind.annotation.ModelAttribute;
11 import org.springframework.web.bind.annotation.RequestMapping;
12 import org.springframework.web.servlet.ModelAndView;
13 
14 @Controller
15 @RequestMapping("/user.do")
16 public class UserController {
17 
18     @SuppressWarnings("unchecked")
19     @RequestMapping(params = "method=add")
20     public String login(@ModelAttribute("user")
21     User user, HttpServletRequest req, HttpServletResponse response) {
22         // 此处调用服务层进行相应的业务操作
23         System.out.println("用户信息: " + user);
24         // 传递对象于下一页面
25         req.setAttribute("user", user);
26         // 调用服务层进行验证用户,此处只演示功能
27         if ("spring".equals(user.getUserId())
28                 && "spring".equals(user.getUserPassword())) {
29             return "success";
30         }
31         return "error";
32     }
33 
34     @SuppressWarnings("unchecked")
35     // @RequestMapping(params= "method=add2",method=RequestMethod.POST)
36     // 定义method方法不是必须的
37     @RequestMapping(params = "method=add2")
38     public ModelAndView login2(@ModelAttribute("user")
39     User user, HttpServletRequest req, HttpServletResponse response) {
40 
41         // 此处调用服务层进行相应的业务操作
42         System.out.println("用户信息2: " + user);
43         // 使用ModelAndView保存对象于下一页面
44         ModelAndView model = new ModelAndView();
45         model.addObject("user", user);
46         // 调用服务层进行验证用户,此处只演示功能
47         if ("spring".equals(user.getUserId())
48                 && "spring".equals(user.getUserPassword())) {
49             model.setViewName("success");
50         } else {
51             model.setViewName("error");
52         }
53         return model;
54     }    
55     
56     @RequestMapping(params = "method=add3")
57     public String login3(@ModelAttribute("user")User user,Model model) {    
58         
59         model.addAttribute("user",user);          
60         System.out.println("用户信息3: "+user);
61         // 调用服务层进行验证用户,此处只演示功能
62         if ("spring".equals(user.getUserId())    && "spring".equals(user.getUserPassword())) {
63             return "success";
64         }
65         //放入model默认把参数存于请求
66         model.addAttribute("msg","用户或者密码错误!");
67         return  "error";
68         
69         /**
70          * 重定向JSP页面,走出了springmvc配置的view(jsp)
71          * 因为这样说明:model.addAttribute("msg","用户或者密码错误!"); 
72          * 获取不到值了
73          * 不加上.jsp就是这样:http://127.0.0.1:8080/Spring3-Login-Annotaction/index?msg=%E7...        
74          * */        
75         //返回到页面是乱码在页面中用${msg}获取不到值,用request.getParams("msg");为乱码
76         //return "redirect:index.jsp?msg=用户或者密码错误!";        
77     }    
78 
79 
80 }

View Code

 1 package net.liuzd.vo;
 2 
 3 public class User {
 4     
 5     private String userId = null;
 6     private String userPassword = null;
 7     
 8     public String getUserId() {
 9         return userId;
10     }
11     public void setUserId(String userId) {
12         this.userId = userId;
13     }
14     public String getUserPassword() {
15         return userPassword;
16     }
17     public void setUserPassword(String userPassword) {
18         this.userPassword = userPassword;
19     }
20     
21     public User() {
22         
23     }
24     
25     public User(String userId2, String userPassword2) {
26         this.userId = userId2;
27         this.userPassword = userPassword2;
28     }
29     @Override
30     public String toString() {        
31         return "userId: " + userId + ",userPassword: " + userPassword;
32     }
33 
34 }

View Code

springmvc.xml

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <beans xmlns="http://www.springframework.org/schema/beans" 
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:p="http://www.springframework.org/schema/p" 
 5     xmlns:context="http://www.springframework.org/schema/context"
 6     xsi:schemaLocation="
 7         http://www.springframework.org/schema/beans 
 8         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 9         http://www.springframework.org/schema/context 
10         http://www.springframework.org/schema/context/spring-context-3.0.xsd">
11     <!-- 
12          自动搜索@Controller标注的类
13          用于指明系统从哪个路径下寻找controller，然后提前初始化这些对象。
14      -->
15     <context:component-scan base-package="net.liuzd.web.action" />    
16     
17     <!-- Default ViewResolver -->
18     <bean id="viewResolver"
19         
20 
21 class="org.springframework.web.servlet.view.InternalResourceViewResolver">
22         <property name="viewClass"
23             value="org.springframework.web.servlet.view.JstlView" />
24         <property name="prefix" value="/WEB-INF/jsp/" />
25         <property name="suffix" value=".jsp"></property>
26     </bean>   
27     
28  </beans>

View Code

web.XML

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 5     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 6 
 7     <filter>
 8         <filter-name>encodingFilter</filter-name>
 9         <filter-class>
10             org.springframework.web.filter.CharacterEncodingFilter
11         </filter-class>
12         <init-param>
13             <param-name>encoding</param-name>
14             <param-value>UTF-8</param-value>
15         </init-param>
16         <init-param>   
17             <param-name>forceEncoding</param-name>   
18             <param-value>false</param-value>   
19         </init-param>  
20     </filter>
21 
22     <filter-mapping>
23         <filter-name>encodingFilter</filter-name>
24         <url-pattern>*.do</url-pattern>
25     </filter-mapping>
26     
27     <filter-mapping>
28         <filter-name>encodingFilter</filter-name>
29         <url-pattern>*.jsp</url-pattern>
30     </filter-mapping>
31 
32     <servlet>
33         <servlet-name>springmvc</servlet-name>
34         <servlet-class>
35             org.springframework.web.servlet.DispatcherServlet
36         </servlet-class>
37         <init-param>
38             <param-name>contextConfigLocation</param-name>            
39             <!-- 
40               指定XML文件位置
41               <param-value>/WEB-INF/classes/springmvc.xml              
42               <param-value>classpath*:springmvc.xml
43              -->
44              <!-- 在classpath路径下去寻找springmvc.xml文件 -->             
45              <param-value>classpath:springmvc.xml
46             </param-value>
47         </init-param>
48         <load-on-startup>1</load-on-startup>
49     </servlet>
50 
51     <servlet-mapping>
52         <servlet-name>springmvc</servlet-name>
53         <url-pattern>*.do</url-pattern>
54     </servlet-mapping>
55     <welcome-file-list>
56         <welcome-file>index.jsp</welcome-file>
57     </welcome-file-list>
58 
59 </web-app>

View Code

index.JSP

 1 <%@ page language="java" pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 3 <html>
 4   <head>
 5     <%@ include file="/common/meta.jsp"%>
 6   </head>  
 7   <body>
 8      <form action="${pageContext.request.contextPath}/user.do?method=add" method="post">
 9         ID号: <input type="text" name="userId" id="userId"><br>
10          密码: <input type="password" name="userPassword" id="userPassword"><br>
11          <input type="submit" value="Login">
12      </form>  <br>
13      <form action="${pageContext.request.contextPath}/user.do?method=add2" 
14 
15 method="post">
16         ID号: <input type="text" name="userId" id="userId"><br>
17          密码: <input type="password" name="userPassword" id="userPassword"><br>
18          <input type="submit" value="Login2">
19      </form>  
20       <br>
21      <form action="${pageContext.request.contextPath}/user.do?method=add3" 
22 
23 method="post">
24         ID号: <input type="text" name="userId" id="userId"><br>
25          密码: <input type="password" name="userPassword" id="userPassword"><br>        
26          <input type="submit" value="Login3">
27      </form>       
28   </body>
29 </html>

View Code

error.jsp

 1 <%@ page language="java" pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
 2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6      <%@ include file="/common/meta.jsp"%>
 7   </head>  
 8   <body>
 9       登录错误:ID号: ${user.userId},密码: ${user.userPassword},<font color='red'>${msg}</font><br>
10      <a href="${pageContext.request.contextPath}/index.jsp">返回</a>
11   </body>
12 </html>

View Code

success.jsp

 1 <%@ page language="java" pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
 2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6     <%@ include file="/common/meta.jsp"%>
 7   </head>  
 8   <body>
 9       欢迎你: ${user.userId}<br>
10      <a href="${pageContext.request.contextPath}/index.jsp">返回</a>
11   </body>
12 </html>

View Code

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原文地址：https://www.cnblogs.com/zzzzw/p/4849728.html