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);
    }
}