生產(chǎn)環(huán)境

• SpringBoot
• Hibernate

問題描述

在service層的LoginService中我使用@Resource注入了SpringBoot的UserRepository接口，在controller層的LoginController中調(diào)用了LoginService中的CheckPassword靜態(tài)方法竭望，運(yùn)行過程出現(xiàn)了UserRepositoy注入失敗的問題硬爆，經(jīng)過查找資料發(fā)現(xiàn)@Resource不能用于注入靜態(tài)變量鱼鼓，所以我去掉了靜態(tài)變量并在LoginController中new了一個(gè)LoginService對(duì)象苍在，還是注入失敗盖腕，經(jīng)過查找資料發(fā)現(xiàn)存在@Resource的類不能使用new（自己注入依賴）

解決方案

將LoginService也改為@Resource注入鲸湃，需要在LoginService類前加上@Component注解，因?yàn)锧Resource是通過name來查找需要注入的Bean的

最終代碼

• com.example.demo.service.LoginService

@Component("LoginService")
public class LoginService {
    @Resource
    private UserRepository userRepository;

    public void checkValidation(String username, String password) throws DemoException{
        if (username == null || username.isEmpty()) {
            throw new DemoException("用戶名不能為空");
        } else if (password == null || password.isEmpty()) {
            throw new DemoException("密碼不能為空");
        }
    }


    public User checkPassword(String username, String password) throws DemoException {
       try {
           System.out.println(username);
           System.out.println(userRepository);
           User user = userRepository.findByUsername(username);
           if (!password.equals(user.getPassword())) {
               throw new DemoException("密碼錯(cuò)誤");
           }
           return user;
       } catch (NullPointerException e) {
           System.out.println("無法登錄华弓，數(shù)據(jù)庫中不存在該用戶");
           throw new DemoException(("用戶不存在"));
       }
    }
}

• com.example.demo.controller.LoginController

@RestController
@RequestMapping("/login")
public class LoginController {

    @Resource
    LoginService loginService;

    @PostMapping
    public BaseResponse Login(@RequestBody LoginRequest loginRequest) {


        try {
            String username = loginRequest.getUsername();
            String password = loginRequest.getPassword();
            loginService.checkValidation(username, password);
            User user = loginService.checkPassword(username, password);
            LoginData loginData = new LoginData();
            loginData.setId(user.getId());
            loginData.setType(user.getId());
            BaseResponse<LoginData> baseResponse = new BaseResponse<>();
            baseResponse.setData(loginData);
            return (baseResponse);
        } catch (DemoException e) {
            BaseResponse<String> baseResponse = new BaseResponse<>();
            baseResponse.setStatus("error");
            baseResponse.setData(e.getMessage());
            return baseResponse;
        }

    }

}