@RequestMapping和RequestParam注解的使用

朴灿烈づ我的快乐病毒、 2022-09-30 11:49 190阅读 0赞

1.在Web.xml中配置前端控制器DispatcherServlet

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1.  **<?****xml**version="1.0"encoding="UTF-8"**?>**
2.  **<****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"**>**
3.  **<****display-name****>**RequestMappingTest**</****display-name****>**
4.  
5.  **<****servlet****>**
6.  **<****servlet-name****>**springmvc**</****servlet-name****>**
7.  **<****servlet-class****>**
8.   org.springframework.web.servlet.DispatcherServlet 
9.  **</****servlet-class****>**
10. **<****init-param****>**
11. **<****param-name****>**contextConfigLocation**</****param-name****>**
12. **<****param-value****>**/WEB-INF/springmvc-config.xml**</****param-value****>**
13. **</****init-param****>**
14. **<****load-on-startup****>**1**</****load-on-startup****>**
15. **</****servlet****>**
16. 
17. **<****servlet-mapping****>**
18. **<****servlet-name****>**springmvc**</****servlet-name****>**
19. **<****url-pattern****>**/**</****url-pattern****>**
20. **</****servlet-mapping****>**
21. 
22. 
23. **<****filter****>**
24. **<****filter-name****>**characterEncodingFilter**</****filter-name****>**
25. **<****filter-class****>**org.springframework.web.filter.CharacterEncodingFilter**</****filter-class****>**
26. **<****init-param****>**
27. **<****param-name****>**encoding**</****param-name****>**
28. **<****param-value****>**UTF-8**</****param-value****>**
29. **</****init-param****>**
30. **</****filter****>**
31. **<****filter-mapping****>**
32. **<****filter-name****>**characterEncodingFilter**</****filter-name****>**
33. **<****url-pattern****>**/\***</****url-pattern****>**
34. **</****filter-mapping****>**
35. **</****web-app****>**

2.配置Spring MVC的Controller

springmvc-config.xml

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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:mvc="http://www.springframework.org/schema/mvc"
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-4.2.xsd 
9.   http://www.springframework.org/schema/mvc 
10.  http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd 
11.  http://www.springframework.org/schema/context 
12.  http://www.springframework.org/schema/context/spring-context-4.2.xsd"**>**
13. 
14.  
19. **<****bean**id="viewResolver"class="org.springframework.web.servlet.view.InternalResourceViewResolver"**>**
20. 
21. **<****property**name="prefix"**>**
22. **<****value****>**/WEB-INF/content/**</****value****>**
23. **</****property****>**
24. 
25. **<****property**name="suffix"**>**
26. **<****value****>**.jsp**</****value****>**
27. **</****property****>**
28. **</****bean****>**
29. **</****beans****>**

3.前端页面

loginForm.jsp

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1.  **<**%@ page language="java"contentType="text/html; charset=UTF-8"
2.  pageEncoding="UTF-8"%**>**
3.  <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"**>**
4.  **<****html****>**
5.  **<****head****>**
6.  **<****meta**http-equiv="Content-Type"content="text/html; charset=UTF-8"**>**
7.  **<****title****>**登录页面**</****title****>**
8.  **</****head****>**
9.  **<****body****>**
10. **<****h3****>**登录页面**</****h3****>**
11. **<****form**action="login"method="post"**>**
12. **<****table****>**
13. **<****tr****>**
14. **<****td****>****<****label****>**登录名: **</****label****>****</****td****>**
15. **<****td****>****<****input**type="text"id="loginname"name="loginname"**>****</****td****>**
16. **</****tr****>**
17. **<****tr****>**
18. **<****td****>****<****label****>**密码: **</****label****>****</****td****>**
19. **<****td****>****<****input**type="password"id="password"name="password"**>****</****td****>**
20. **</****tr****>**
21. **<****tr****>**
22. **<****td****>****<****input**id="submit"type="submit"value="登录"**>****</****td****>**
23. **</****tr****>**
24. **</****table****>**
25. **</****form****>**
26. **</****body****>**
27. **</****html****>**

registerForm.jsp

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1.  **<**%@ page language="java"contentType="text/html; charset=UTF-8"
2.  pageEncoding="UTF-8"%**>**
3.  <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"**>**
4.  **<****html****>**
5.  **<****head****>**
6.  **<****meta**http-equiv="Content-Type"content="text/html; charset=UTF-8"**>**
7.  **<****title****>**注册页面**</****title****>**
8.  **</****head****>**
9.  **<****body****>**
10. **<****h3****>**注册页面**</****h3****>**
11. **<****form**action="register"method="post"**>**
12. **<****table****>**
13. **<****tr****>**
14. **<****td****>****<****label****>**登录名: **</****label****>****</****td****>**
15. **<****td****>****<****input**type="text"id="loginname"name="loginname"**>****</****td****>**
16. **</****tr****>**
17. **<****tr****>**
18. **<****td****>****<****label****>**密码: **</****label****>****</****td****>**
19. **<****td****>****<****input**type="password"id="password"name="password"**>****</****td****>**
20. **</****tr****>**
21. **<****tr****>**
22. **<****td****>****<****label****>**真实姓名: **</****label****>****</****td****>**
23. **<****td****>****<****input**type="text"id="username"name="username"**>****</****td****>**
24. **</****tr****>**
25. **<****tr****>**
26. **<****td****>****<****input**id="submit"type="submit"value="注册"**>****</****td****>**
27. **</****tr****>**
28. **</****table****>**
29. **</****form****>**
30. **</****body****>**
31. **</****html****>**

welcome.jsp

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4.后端的实现

User.[Java][]

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1.  **package** org.fkit.domain; 
2.  
3.  **import** java.io.Serializable; 
4.  //域对象，实现序列化接口
5.  **public****class** User **implements** Serializable \{ 
6.  **private** String loginname; 
7.  **private** String password; 
8.  **private** String username; 
9.  **public** User() \{ 
10. **super**(); 
11. // TODO Auto-generated constructor stub
12.  \} 
13. **public** String getLoginname() \{ 
14. **return** loginname; 
15.  \} 
16. **public****void** setLoginname(String loginname) \{ 
17. **this**.loginname = loginname; 
18.  \} 
19. **public** String getPassword() \{ 
20. **return** password; 
21.  \} 
22. **public****void** setPassword(String password) \{ 
23. **this**.password = password; 
24.  \} 
25. **public** String getUsername() \{ 
26. **return** username; 
27.  \} 
28. **public****void** setUsername(String username) \{ 
29. **this**.username = username; 
30.  \} 
31. \}

UserController.java

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1.  **package** org.fkit.controller; 
2.  
3.  **import** java.util.ArrayList; 
4.  **import** java.util.List; 
5.  
6.  **import** org.apache.commons.logging.Log; 
7.  **import** org.apache.commons.logging.LogFactory; 
8.  **import** org.fkit.domain.User; 
9.  **import** org.springframework.stereotype.Controller; 
10. **import** org.springframework.ui.Model; 
11. **import** org.springframework.web.bind.annotation.RequestMapping; 
12. **import** org.springframework.web.bind.annotation.RequestMethod; 
13. **import** org.springframework.web.bind.annotation.RequestParam; 
14. 
15. 
16. //Controller注解用于指示该类是一个控制器，可以同时处理多个请求动作
17. @Controller
18. //RequestMapping可以用来注释一个控制器类，此时，所有方法都将映射为相对于类级别的请求, 
19. //表示该控制器处理所有的请求都被映射到 value属性所指示的路径下
20. @RequestMapping(value="/user") 
21. **public****class** UserController \{ 
22. // 静态List<User>集合，此处代替数据库用来保存注册的用户信息
23. **private****static** List<User> userList; 
24. 
25. // UserController类的构造器，初始化List<User>集合
26. **public** UserController() \{ 
27. **super**(); 
28.  userList = **new** ArrayList<User>(); 
29. // TODO Auto-generated constructor stub
30.  \} 
31. 
32. // 静态的日志类LogFactory
33. **private****static****final** Log logger = LogFactory.getLog(UserController.**class**); 
34. 
35. // 该方法映射的请求为http://localhost:8080/context/user/register，该方法支持GET请求
36. @RequestMapping(value="/register",method=RequestMethod.GET) 
37. **public** String registerForm() \{ 
38.  logger.info("register GET方法被调用..."); 
39. // 跳转到注册页面
40. **return**"registerForm"; 
41.  \} 
42. 
43. // 该方法映射的请求为http://localhost:8080/RequestMappingTest/user/register，该方法支持POST请求
44. @RequestMapping(value="/register",method=RequestMethod.POST) 
45. // 将请求中的loginname参数的值赋给loginname变量,password和username同样处理
46. **public** String register(@RequestParam("loginname") String loginname, 
47. @RequestParam("password") String password, 
48. @RequestParam("username") String username)\{ 
49.  logger.info("register POST方法被调用..."); 
50. // 创建User对象
51.  User user=**new** User(); 
52.  user.setLoginname(loginname); 
53.  user.setPassword(password); 
54.  user.setUsername(username); 
55. // 模拟数据库存储User信息
56.  userList.add(user); 
57. // 跳转到登录页面
58. **return**"loginForm"; 
59.  \} 
60. 
61. // 该方法映射的请求为http://localhost:8080/RequestMappingTest/user/login
62. @RequestMapping("/login") 
63. **public** String login( 
64. // 将请求中的loginname参数的值赋给loginname变量,password同样处理
65. @RequestParam("loginname") String loginname, 
66. @RequestParam("password") String password, 
67.  Model model)\{ 
68.  logger.info("登录名:"\+loginname + " 密码:" \+ password); 
69. // 到集合中查找用户是否存在，此处用来模拟数据库验证
70. **for**(User user :userList)\{ 
71. **if**(user.getLoginname().equals(loginname) && user.getPassword().equals(password))\{ 
72.  model.addAttribute("user",user); 
73. **return**"welcome"; 
74.  \} 
75.  \} 
76. **return**"loginForm"; 
77.  \} 
78. 
79. 
80. \}

截图：

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![Center 1][]

![Center 2][]

![Center 3][]

\------->源码：[百度网盘极速下载][Link 1]

[view plain]: http://blog.csdn.net/haige_lin/article/details/64457954#
[Java]: http://lib.csdn.net/base/javase
[Center]: /images/20220706/8e8f0cbc45d84921a91b5a17079af3e0.png
[Center 1]: /images/20220706/242c2748422243169bf0ca969a572261.png
[Center 2]: /images/20220706/6b9733d7f140434a969bc1b402c77c9b.png
[Center 3]: /images/20220706/935c53f594d34e2088ee81af5f737ecd.png
[Link 1]: http://pan.baidu.com/s/1c21Q65M