解释 @RequestMapping("/login") public String show(){ return "login"; }
时间: 2024-06-04 11:08:37 浏览: 8
`@RequestMapping("/login")`是Spring MVC中的一个注解,表示当用户访问应用程序的“/login”路径时,将调用带有此注释的方法。
在上面的代码中,`show()`方法被注释为`@RequestMapping("/login")`,这意味着当用户访问应用程序的“/login”路径时,将调用`show()`方法。该方法返回一个字符串“login”,这是一个视图名称,用于告诉Spring MVC框架哪个JSP或HTML文件应该被渲染并返回给用户作为响应。因此,当用户访问“/login”路径时,将返回名为“login”的视图。
相关问题
package edu.cn.neusoft.project.controller; import edu.cn.neusoft.project.model.service.WorkerService; import javafx.concurrent.Worker; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import java.util.List; @Controller public class WorkerAction { @Autowired private WorkerService service; @RequestMapping("login.action") public String login(){ return"login"; } @RequestMapping("loginSuccess.action") public String loginSuccess(String username,String password){ boolean ret; ret = service.login( new Worker(username,password)); if(ret){ return"loginSuccess"; } return "login"; } @ResponseBody @RequestMapping("worker.action") public List<edu.cn.neusoft.project.model.vo.Worker> worker(Model model) { List<edu.cn.neusoft.project.model.vo.Worker> list = service.showAll(); Model list1 = model.addAttribute("list", list); // for(Worker worker : list){ // System.out.println(worker); // } return list; } @ ResponseBody @ RequestMapping("updateWorker. action" ) public void updateWorker( Worker worker){ System. out. println(" ---up" + worker); service . updateWorker ((edu.cn.neusoft.project.model.vo.Worker) worker); } @ ResponseBody @ RequestMapping (" deleteWorker. action") public void deleteWorker( Integer wid){ // System. out. println("--delt--"+ wid); service . deleteWorker(wid); } @ RequestMapping("regist. action" ) public String regist(){ return "regist"; } @ RequestMapping(" registSuccess. action" ) public String registSuccess(Worker worker){ service . regist((edu.cn.neusoft.project.model.vo.Worker) worker); return "login" ; } }哪里错了?请写出正确代码
看起来代码没有什么明显的语法错误。但是,有几个点需要注意:
1. 在updateWorker方法中,你需要将Worker转换为edu.cn.neusoft.project.model.vo.Worker类型,以便传递给service.updateWorker方法。你可以使用强制类型转换:(edu.cn.neusoft.project.model.vo.Worker)worker。
2. 在registSuccess方法中,你需要将Worker转换为edu.cn.neusoft.project.model.vo.Worker类型,以便传递给service.regist方法。你可以使用强制类型转换:(edu.cn.neusoft.project.model.vo.Worker)worker。
3. 在worker方法中,你已经将list添加到了model中,所以不需要再返回list了。可以直接返回null。
下面是修改后的代码:
```
package edu.cn.neusoft.project.controller;
import edu.cn.neusoft.project.model.service.WorkerService;
import edu.cn.neusoft.project.model.vo.Worker;
import javafx.concurrent.Worker;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
@Controller
public class WorkerAction {
@Autowired
private WorkerService service;
@RequestMapping("login.action")
public String login(){
return "login";
}
@RequestMapping("loginSuccess.action")
public String loginSuccess(String username,String password){
boolean ret;
ret = service.login(new Worker(username,password));
if(ret){
return "loginSuccess";
}
return "login";
}
@ResponseBody
@RequestMapping("worker.action")
public void worker(Model model) {
List<edu.cn.neusoft.project.model.vo.Worker> list = service.showAll();
model.addAttribute("list", list);
// for(Worker worker : list){
// System.out.println(worker);
// }
}
@ResponseBody
@RequestMapping("updateWorker.action")
public void updateWorker(Worker worker){
System.out.println("---up" + worker);
service.updateWorker((edu.cn.neusoft.project.model.vo.Worker) worker);
}
@ResponseBody
@RequestMapping("deleteWorker.action")
public void deleteWorker(Integer wid){
// System.out.println("--delt--"+ wid);
service.deleteWorker(wid);
}
@RequestMapping("regist.action")
public String regist(){
return "regist";
}
@RequestMapping("registSuccess.action")
public String registSuccess(Worker worker){
service.regist((edu.cn.neusoft.project.model.vo.Worker) worker);
return "login";
}
}
```
@Controller @RequestMapping("/zmu") public class LoginController { @Autowired AccountDao adao; @GetMapping("/login") public String login(){ return "login"; } @GetMapping("/registry") public String registry(){ return "registry"; } @PostMapping("/addaccount") //方法中的参数名一定要与网页端属性为name的值一致 public String addAccount(String username,String password, Model model){ Account account=new Account(username,password); account= adao.saveAndFlush(account); if(account.getId()>0) model.addAttribute("success","帐户和密码添加成功"); else model.addAttribute("success","添加帐户和密码失败"); //redirect跳转到对路径,所带的信息会被丢弃 //redirect:/ return "registry"; } @PostMapping("/verify") //方法中的参数名一定要与网页端属性为name的值一致 public String verify(String username,String password, Model model){ boolean s=adao.existsByUsernameAndPassword(username,password); if(s) model.addAttribute("success","合法用户验证成功"); else model.addAttribute("success","无此帐户和密码,登录失败"); //redirect跳转到对路径,所带的信息会被丢弃 //redirect:/ return "login"; } //浏览帐户信息 @GetMapping("/accountshow") public String accountshow(Model model){ List<Account> lists=adao.findAll(); if(lists.size()!=0){ model.addAttribute("success",true); model.addAttribute("account",lists); } else model.addAttribute("success",false); return "account_show"; }对应的删除用户的方法代码
@PostMapping("/deleteaccount")
public String deleteAccount(int id, Model model){
try{
adao.deleteById(id);
model.addAttribute("success","删除帐户成功");
}catch(Exception e){
model.addAttribute("success","删除帐户失败");
}
return "account_show";
}
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