@JsonAutoDetect(fieldVisibility = Visibility.ANY, getterVisibility = Visibility.NONE, isGetterVisibility = Visibility.NONE)
该注解的作用是：使用属性名称来转json。   防止不规范的属性报错，比如 app_id

@JsonIgnoreProperties(ignoreUnknown = true)
该注解的作用是：在进行json转对象是，防止传入的json串包含不存在的属性导致报错。

案例：

 1 @JsonAutoDetect(fieldVisibility = Visibility.ANY, getterVisibility = Visibility.NONE, isGetterVisibility = Visibility.NONE)

 @JsonIgnoreProperties(ignoreUnknown = true)

 public class UnifiedPayOrderResponse {

     private String code;

     private String message;

     private String main_order_code;

     private String app_id;

     public String getCode() {

         return code;

     }

     public void setCode(String code) {

         this.code = code;

     }

     public String getMessage() {

         return message;

     }

     public void setMessage(String message) {

         this.message = message;

     }

     public String getMain_order_code() {

         return main_order_code;

     }

     public void setMain_order_code(String main_order_code) {

         this.main_order_code = main_order_code;

     }

     public String getApp_id() {

         return app_id;

     }

     public void setApp_id(String app_id) {

         this.app_id = app_id;

     }

 }