统一结果集返回类R()

/** * Copyright (c) 2016-2019 人人开源 All rights reserved. * * https://www.renren.io * * 版权所有，侵权必究！ */package com.atguigu.common.utils;import org.apache.http.HttpStatus;import java.util.HashMap;import java.util.Map;/** * 返回数据 * * @author Mark sunlightcs@gmail.com */public class R extends HashMap<String, Object> {   private static final long serialVersionUID = 1L;      public R() {      put("code", 0);      put("msg", "success");   }      public static R error() {      return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, "未知异常，请联系管理员");   }      public static R error(String msg) {      return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, msg);   }      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 ok(String msg) {      R r = new R();      r.put("msg", msg);      return r;   }      public static R ok(Map<String, Object> map) {      R r = new R();      r.putAll(map);      return r;   }      public static R ok() {      return new R();   }   public R put(String key, Object value) {      super.put(key, value);      return this;   }}eg:
@GetMapping("/{attrgroupId}/attr/relation")public R attrRelation(@PathVariable("attrgroupId") Long attrgroupId) {    List<AttrEntity> entities = attrService.getRelationAttr(attrgroupId);    return R.ok().put("data", entities);}
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/** * Copyright (c) 2016-2019 人人开源 All rights reserved. * * https://www.renren.io * * 版权所有，侵权必究！ */package com.atguigu.common.utils;import org.apache.http.HttpStatus;import java.util.HashMap;import java.util.Map;/** * 返回数据 * * @author Mark sunlightcs@gmail.com */public class R extends HashMap<String, Object> {   private static final long serialVersionUID = 1L;      public R() {      put("code", 0);      put("msg", "success");   }      public static R error() {      return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, "未知异常，请联系管理员");   }      public static R error(String msg) {      return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, msg);   }      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 ok(String msg) {      R r = new R();      r.put("msg", msg);      return r;   }      public static R ok(Map<String, Object> map) {      R r = new R();      r.putAll(map);      return r;   }      public static R ok() {      return new R();   }   public R put(String key, Object value) {      super.put(key, value);      return this;   }}eg:
@GetMapping("/{attrgroupId}/attr/relation")public R attrRelation(@PathVariable("attrgroupId") Long attrgroupId) {    List<AttrEntity> entities = attrService.getRelationAttr(attrgroupId);    return R.ok().put("data", entities);}