R 返回值实体类封装

为了团队内部的返回值统一，对于返回值的封装还是很有必要的。

返回的json结构如下：

{
    
    
	"msg": "success",
	"code": 0,
	"data": {
    
    
		//返回值
		.....
	}
}

返回示例：

封装好的R实体类：

/**
 * R返回值封装
 *
 *
 */
package com.xunqi.common.utils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import org.apache.http.HttpStatus;

import java.util.HashMap;
import java.util.Map;

/**
 * 返回数据
 *
 * @author Mark [email protected]
 */
public class R extends HashMap<String, Object> {
    
    
	private static final long serialVersionUID = 1L;

	public R setData(Object data) {
    
    
		put("data",data);
		return this;
	}

	//利用fastjson进行反序列化
	public <T> T getData(TypeReference<T> typeReference) {
    
    
		Object data = get("data");	//默认是map
		String jsonString = JSON.toJSONString(data);
		T t = JSON.parseObject(jsonString, typeReference);
		return t;
	}

	//利用fastjson进行反序列化
	public <T> T getData(String key,TypeReference<T> typeReference) {
    
    
		Object data = get(key);	//默认是map
		String jsonString = JSON.toJSONString(data);
		T t = JSON.parseObject(jsonString, typeReference);
		return t;
	}

	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;
	}

	public Integer getCode() {
    
    

		return (Integer) this.get("code");
	}

}

使用：

package com.xunqi.elq.product.app;

import com.xunqi.common.utils.R;
import com.xunqi.elq.product.entity.AttrEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("product/test")
public class TestConlroller {
    
    
    @RequestMapping("/r")
    public R r(){
    
    
        AttrEntity attrEntity = new AttrEntity();
        attrEntity.setAttrName("实体");
        attrEntity.setCatelogId(1000L);
        //-----------------------------------
        return R.ok().put("data",attrEntity);
    }
}