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Spring MVC框架

Spring MVC框架的優點

Spring MVC框架的示例代碼

以下是一個簡單的Spring MVC框架示例代碼：

UserController.java

@Controller@RequestMapping("/user")public class UserController {  @Autowired  private UserService userService;  @RequestMapping(value = "/addUser", method = RequestMethod.POST)  public String addUser(User user) {    userService.addUser(user);    return "redirect:/user/list";  }  @RequestMapping(value = "/updateUser", method = RequestMethod.POST)  public String updateUser(User user) {    userService.updateUser(user);    return "redirect:/user/list";  }  @RequestMapping(value = "/deleteUser", method = RequestMethod.GET)  public String deleteUser(@RequestParam("userId") int userId) {    userService.deleteUser(userId);    return "redirect:/user/list";  }  @RequestMapping(value = "/getUser", method = RequestMethod.GET)  public String getUser(@RequestParam("userId") int userId, Model model) {    User user = userService.getUser(userId);    model.addAttribute("user", user);    return "userDetails";  }  @RequestMapping(value = "/list", method = RequestMethod.GET)  public String listUsers(Model model) {    List userList = userService.getAllUsers();    model.addAttribute("userList", userList);    return "userList";  }}

userList.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>    
User List
        
    
      
User ID
      
User Name
      
Action
    
    
        
${user.userId}
        
${user.userName}
        
?userId=${user.userId}">View | ?userId=${user.userId}">Delete
      
      
  
  ">Add User

userDetails.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>    
User Details
  
    
      
User ID
      
${user.userId}
    
    
      
User Name
      
${user.userName}
    
  
  
  ">Back to User List

在這個示例中，UserController.java定義了5個請求處理方法來處理用戶相關的操作。這些請求處理方法使用 @RequestMapping注解來指定它們處理的URL。@RequestParam注解用于將請求參數映射到方法參數。Model對象用于在請求處理方法和視圖之間傳遞數據。

在視圖方面，userList.jsp和 userDetails.jsp分別用于顯示用戶列表和用戶詳細信息。這些JSP頁面使用 JSTL和 EL來遍歷用戶列表并顯示用戶信息。其中，標簽用于生成正確的URL以避免硬編碼。

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