Spring和Spring MVC（二）全球快播报

腾讯云 2023-04-07 11:39:56

(资料图片)

Spring MVC框架

Spring MVC框架的优点

MVC模式：Spring MVC框架使用MVC模式来组织应用程序的代码，使得应用程序的开发更加模块化和易于维护。请求处理：Spring MVC框架提供了请求处理的支持，使得应用程序可以更加灵活地处理不同类型的请求。视图技术：Spring MVC框架支持多种视图技术，包括JSP、Velocity、Freemarker等。

Spring MVC框架的示例代码

以下是一个简单的Spring MVC框架示例代码：

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 List
                  User ID       User Name       Action     
            ${user.userId}         ${user.userName}         ?userId=${user.userId}">View | ?userId=${user.userId}">Delete       
      
  
  ">Add User

User ID	User Name	Action
${user.userId}	${user.userName}	?userId=${user.userId}">View \| ?userId=${user.userId}">Delete

userDetails.jsp

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

User ID	${user.userId}
User Name	${user.userName}

在这个示例中，UserController.java定义了5个请求处理方法来处理用户相关的操作。这些请求处理方法使用 @RequestMapping注解来指定它们处理的URL。@RequestParam注解用于将请求参数映射到方法参数。Model对象用于在请求处理方法和视图之间传递数据。

在视图方面，userList.jsp和 userDetails.jsp分别用于显示用户列表和用户详细信息。这些JSP页面使用 JSTL和 EL来遍历用户列表并显示用户信息。其中，标签用于生成正确的URL以避免硬编码。