Java-对返回参数进行处理（parseObject，getJSONArray,getJSONObject）

a代表response返回的结果，获取字段reserve3的值，操作代码如下：

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class testBeanshellAss {
    public static void main(String[] args) {
        String a = "{
"
                + " "header": {
"
                + "  "errcode": "0000000000",
"
                + "  "errmsg": "SUCCESS"
"
                + " },
"
                + " "data": [{
"
                + "  "idDynBizSd": "20",
"
                + "  "sdBiz": "2",
"
                + "  "cdDynBizSd": "201",
"
                + "  "nmDynBizSd": "ww",
"
                + "  "cdDynBizSdPar": "0",
"
                + "  "reserve1": "qq",
"
                + "  "reserve2": "ww",
"
                + "  "reserve3": "reserve3:1",
"
                + "  "reserve4": null,
"
                + "  "reserve5": null
"
                + " },
"
                + " {
"
                + "  "idDynBizSd": "20",
"
                + "  "sdBiz": "2",
"
                + "  "cdDynBizSd": "201",
"
                + "  "nmDynBizSd": "ww",
"
                + "  "cdDynBizSdPar": "0",
"
                + "  "reserve1": "qq",
"
                + "  "reserve2": "ww",
"
                + "  "reserve3": "reserve3:2",
"
                + "  "reserve4": null,
"
                + "  "reserve5": null
"
                + " },
"
                + " {
"
                + "  "idDynBizSd": "20",
"
                + "  "sdBiz": "2",
"
                + "  "cdDynBizSd": "201",
"
                + "  "nmDynBizSd": "ww",
"
                + "  "cdDynBizSdPar": "0",
"
                + "  "reserve1": "qq",
"
                + "  "reserve2": "ww",
"
                + "  "reserve3": "reserve3:3",
"
                + "  "reserve4": null,
"
                + "  "reserve5": null
"
                + " }]
"
                + "}";
        //将字符串转换为了对象
        JSONObject jo = JSON.parseObject(a);
        //获取data对象 data的对象为[]，所以要转化为JSONArray类型的对象
        JSONArray data = jo.getJSONArray("data");
        int size = data.size();
        for(int i = 0 ; i<size ; i++) {
            JSONObject dataIndex = data.getJSONObject(i);
            String reserve3 = dataIndex.getString("reserve3");
            System.out.println(reserve3);

        }

    }
}

#获取header及errcode、errmsg

        JSONObject resultJsonObject = JSONObject.parseObject(a);
        JSONObject headerJsonObject = resultJsonObject.getJSONObject("header");
        System.out.println(headerJsonObject);
        String errcode = headerJsonObject.getString("errcode");
        System.out.println("errcode为："+errcode);
        String errmsg = headerJsonObject.getString("errmsg");
        System.out.println("errmsg为："+errmsg);

#如下链接的文章，写的比较好，每一步骤都有说明。

https://www.cnblogs.com/chushujin/p/11371450.html