【Java】通用 JSON 返回的通用数据类

import java.util.HashMap;/*** 存储返回给前端的数据内容*/
public class R extends HashMap<String, Object> {private static final long serialVersionUID = 1L;public R() {put("code", 0);}public static R error(String msg) {R r = new R();r.put("code", 500);r.put("msg", msg);return r;}public static R error(int code, String msg) {R r = new R();r.put("code", code);r.put("msg", msg);return r;}public static R success(Object data) {R r = new R();r.put("data", data);return r;}public static R success(String msg) {R r = new R();r.put("msg", msg);return r;}public static R success(String msg, Object data) {R r = new R();r.put("code", 0);r.put("msg", msg);r.put("data", data);return r;}public static R success(HashMap<String, Object> map) {R r = new R();r.putAll(map);return r;}public static R success() {return new R();}@Overridepublic R put(String key, Object value) {super.put(key, value);return this;}
}