使用@JsonView注解控制返回的Json属性

我也是刚看到原来还可以这么玩，但是我还是习惯使用Dto，我总感觉这样做的话实体类耦合程度有点高。还是记录以下，万一今后用到了呢

⒈在实体类中使用接口来声明该实体类的多个视图。

⒉在实体类的属性get方法上指定该属性在那个视图中呈现。

 package cn.coreqi.security.entities;

 import com.fasterxml.jackson.annotation.JsonView;

 public class User {
     public interface UserSimpleView{};　　//简单视图
     public interface UserDetailView extends UserSimpleView{};　　//高级视图

     private Long id;
     private String username;
     private String password;
     private Integer enabled;

     public User() {
     }

     public User(Long id, String username, String password, Integer enabled) {
         this.id = id;
         this.username = username;
         this.password = password;
         this.enabled = enabled;
     }

     @JsonView(UserSimpleView.class)
     public Long getId() {
         return id;
     }

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

     @JsonView(UserSimpleView.class)
     public String getUsername() {
         return username;
     }

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

     @JsonView(UserDetailView.class)
     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }
     @JsonView(UserSimpleView.class)
     public Integer getEnabled() {
         return enabled;
     }

     public void setEnabled(Integer enabled) {
         this.enabled = enabled;
     }

     @Override
     public String toString() {
         return "User{" +
                 "id=" + id +
                 ", username='" + username + '\'' +
                 ", password='" + password + '\'' +
                 ", enabled=" + enabled +
                 '}';
     }
 }

⒊在控制器的Action方法上使用@JsonView注解声明该Action返回的实体类视图。

 package cn.coreqi.security.controller;

 import cn.coreqi.security.entities.User;
 import com.fasterxml.jackson.annotation.JsonView;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RestController;
 import java.util.ArrayList;
 import java.util.List;

 @RestController
 public class UserController {
     @GetMapping("/users")
     @JsonView(User.UserSimpleView.class)
     public List<User> query(){
         List<User> users = new ArrayList<>();
         users.add(new User(1L,"fanqi","fanqi",1));
         users.add(new User(2L,"fanqi","fanqi",1));
         users.add(new User(3L,"fanqi","fanqi",1));
         return users;
     }

     @GetMapping("/user/{id:\\d+}")  //使用正则指定Id为数字
     @JsonView(User.UserDetailView.class)
     public User getInfo(@PathVariable String id){
         return new User(1L,"fanqi","fanqi",1);
     }
 }