无法获得正确的 GET 响应

Question

我正在尝试在 spring-boot 中实现 GET 和 POST 方法。调用 GET 方法时没有得到正确的响应。

我的控制器类

@RestController
@RequestMapping("api/public")
public class PublicRestApiController {

@GetMapping("users")
public List<User> users(){
    return this.userRepository.findAll();
}

@PostMapping(path="/save")
@ResponseBody public User insertusers( @RequestBody UserRequest requestUser){
    User user = new User(requestUser.getUsername(),passwordEncoder.encode(requestUser.getPassword()),requestUser.getRoles(),requestUser.getPermissions());
    try { 
        user = this.userRepository.save(user);
        return user;
    }
    catch(Error e) {
        return user;
    }
}

}

用户请求类

public class UserRequest {

public String getUsername() {
    return username;
}
public void setUsername(String username) {
    this.username = username;
}
public String getPassword() {
    return password;
}
public void setPassword(String password) {
    this.password = password;
}
public int getActive() {
    return active;
}
public void setActive(int active) {
    this.active = active;
}
public String getRoles() {
    return roles;
}
public void setRoles(String roles) {
    this.roles = roles;
}
public String getPermissions() {
    return permissions;
}
public void setPermissions(String permissions) {
    this.permissions = permissions;
}
private String username;
private String password;
private int active;
private String roles = "";
private String permissions = "";

}

用户类

@Entity
@Table(name = "USER_DETAILS")
public class User {

@Id
@Column
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;

@Column(nullable = false)
private String username;

@Column(nullable = false)
private String PASSWORD;

@Column
private int ACTIVE;

@Column
private String ROLES = "";

@Column
private String PERMISSIONS = "";

public User(String username, String password, String roles, String permissions){
    this.username = username;
    this.PASSWORD = password;
    this.ROLES = roles;
    this.PERMISSIONS = permissions;
    this.ACTIVE = 1;
}

public User(){}

public int getId() {
    return id;
}

public String getUsername() {
    return username;
}

public String getPassword() {
    return PASSWORD;
}

public int getActive() {
    return ACTIVE;
}

public String getRoles() {
    return ROLES;
}

public String getPermissions() {
    return PERMISSIONS;
}

public void setId(int id) {
    this.id = id;
}

public void setUsername(String username) {
    this.username = username;
}

public void setPassword(String password) {
    this.PASSWORD = password;
}

public void setActive(int active) {
    this.ACTIVE = active;
}

public void setRoles(String roles) {
    this.ROLES = roles;
}

public void setPermissions(String permissions) {
    this.PERMISSIONS = permissions;
}
}

UserRepository 类

@Repository
public interface UserRepository extends JpaRepository<User, Long>{

}

POST 方法工作正常，但在调用 GET 方法时，id 字段将变为默认值 0。未获取正确的 ID 值。而且在运行服务器时，如果我调用 POST 方法，它正在向数据库中插入数据，但是新插入的数据并没有被 GET 方法获取。只有那些数据被获取，我已经在数据库中插入了这些数据。

This is the data in database

This is the response which I am getting form GET method

Answer 1

您的 USER 类具有类型为 int 的主键，并且在您的存储库中，您已扩展 带有 long 的 USER 类，它应该是 Integer，如下所示

存储库：

 @Repository
 public interface UserRepository extends JpaRepository<User, Integer>{

 }

---

更新：

 @Autowired UserRepository userRepository;

         @GetMapping("users")
         public List<User> users(){
              return userRepository.getAllUsers();
         }

存储库：

 @Repository
 public interface UserRepository extends JpaRepository<User, Integer>{
      @Query(value="select * from USER_DETAILS",nativeQuery=true)
      List<User> getAllUsers();
 }

从import org.springframework.data.jpa.repository.Query;导入@Query

---

更新2： 项目结构的理想方式是根据类行为有不同的包。

• 控制器
• 服务
• 存储库
• 模型或实体
• DTO、DAO
• 根据要求进行安全、配置等

---

     //Controller
     @yourMapping
     public returnType method1()
     {
         myService.performBusinessLoginonMethod1(...) //if you are using services
         myReposiroty.DBOpertaion(...) //as per above case
     }

     //Service: myService
     returnType  performBusinessLoginonMethod1(...) 
     {
         myRepository.DBOpertaion(...)
     }

     //Repository: myRepository     
     @Modifying // import org.springframework.data.jpa.repository.Modifying;
     @Query(...)
     returnType DBOpertaion(...)

Answer 2

您没有正确返回响应。试试这个。

    @GetMapping("users")
public ResponseEntity<List<Article>> users(){
        return new ResponseEntity<List<Article>>(this.userRepository.findAll(), HttpStatus.OK);
}