包裝前：

{"name":"王月","age":0}
包裝後：

{"status":{"code":0,"name":"OK","msg":"succeed"},"result":{"name":"王月","age":0}}
實現思路：ResponseBodyAdvice+自定義註解

ResponseBodyAdvice實現類：
@ControllerAdvice
public class FocusResponseBodyAdvice implements ResponseBodyAdvice {
 
  /**
   * 在這個方法完成 "怎樣封裝結果集"
   */
  @Override
  public Object beforeBodyWrite(Object returnValue, MethodParameter methodParameter, MediaType mediaType, Class clas, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {
    return ApiResp.ok(returnValue);
  }
 
  /**
   * 在這個方法完成 "是否對這個介面生效"  方案1.直接判斷方法名 方案二2.判斷哪些介面打註解[推薦]
   */
 
  @Override
  public boolean supports(MethodParameter methodParameter, Class clas) {
    AnnotatedElement annotatedElement = methodParameter.getAnnotatedElement();
    FocusAnnotation focusController = AnnotationUtils.findAnnotation(annotatedElement, FocusAnnotation.class);
    return focusController != null;
  }
}
自定義註解類：

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface FocusAnnotation {
}
基類:

public class GirlFriend {
 
  private String name;
  private int age;
 
  public String getName() {
    return name;
  }
 
  public void setName(String name) {
    this.name = name;
  }
 
  public int getAge() {
    return age;
  }
 
  public void setAge(int age) {
    this.age = age;
  }
 
}
響應包裝類：

  public class ApiResp {
  public static ApiResp OK = new ApiResp(Status.OK);
 
  public static ApiResp error(Status status) {
    return new ApiResp(status);
  }
 
  public static ApiResp ok(Object result) {
    return new ApiResp(Status.OK, result);
  }
 
  private final Status status;
 
  private final Object result;
 
  public ApiResp(Status status) {
    this(status, null);
  }
 
  public ApiResp(Status status, Object result) {
    this.status = status;
    this.result = result;
  }
 
  public Status getStatus() {
    return status;
  }
 
  public Object getResult() {
    return result;
  }
}
響應類包裝類2：

public class Status {
  public static Status OK = new Status(0, "OK", "succeed");
 
  private final int code;
  private final String name;
  private String msg;
 
  /**
   * @param code 錯誤碼
   */
  public Status(int code) {
    this(code, String.valueOf(code), String.valueOf(code));
  }
 
  /**
   * @param code 錯誤碼
   * @param name 錯誤的名字
   */
  public Status(int code, String name) {
    this(code, name, name);
  }
 
  /**
   * @param code 錯誤碼
   * @param name 錯誤的名字
   * @param msg  錯誤資訊，用於提示
   */
  public Status(int code, String name, String msg) {
    this.code = code;
    this.name = name;
    this.msg = msg;
  }
  
  /**
   * @return 錯誤碼
   */
  public int getCode() {
    return code;
  }
 
  /**
   * @return 錯誤的名字
   */
  public String getName() {
    return name;
  }
 
  /**
   * @return 錯誤資訊，用於提示
   */
  public String getMsg() {
    return msg;
  }
 
  /**
   * @param msg 錯誤資訊，用於提示
   */
  public Status setMsg(String msg) {
    this.msg = msg;
    return this;
  }
 
}
Controller類：

@Controller
public class MainController {
 
    @RequestMapping(value = "/annotation",method = RequestMethod.GET)
    @ResponseBody
    @FocusAnnotation   //只有第一個加了自定義註解
    public GirlFriend sayHello(){
        GirlFriend girlFriend = new GirlFriend();
        girlFriend.setName("王月");
        return girlFriend;
    }
 
    @RequestMapping(value = "/annotation2",method = RequestMethod.GET)
    @ResponseBody
    public GirlFriend sayHello2(){
        GirlFriend girlFriend = new GirlFriend();
        girlFriend.setName("王月");
        return girlFriend;
    }
}
 
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