1.依赖jar包

import org.json.JSONArray;import org.json.JSONObject;

2.代码实例（一）

json字符串的格式是｛k:v, k:v, k:[{k:v},{k:v},{k:v}]｝

{    "totalpages":"1",    "currpage":"1",    "totalrecords":"31",    "griddata":[        {            "tagkey":"YK011011012",            "unitkey":"YK01101",            "timestamp":"2019/7/16 10:24:29",            "value":"22.9",            "tagstatus":"0",            "sysgroup":"安全监测监控系统",            "createtime":"2019/7/16 10:24:29",            "unitname":"南屯煤矿",            "groupkey":"YK01",            "sortnum":"1",            "tagname":"三采避难硐室外温度",            "description":"",            "tagtype":"温度",            "engunit":"℃",            "datatype":"1",            "minraw":"45",            "maxraw":"-5",            "loalarmlimit":"35",            "hialarmlimit":"0"        },        {            "tagkey":"YK011011225",            "unitkey":"YK01101",            "timestamp":"2019/7/16 10:24:29",            "value":"28.2",            "tagstatus":"0",            "sysgroup":"安全监测监控系统",            "createtime":"2019/7/16 10:24:29",            "unitname":"南屯煤矿",            "groupkey":"YK01",            "sortnum":"1",            "tagname":"七采西部变电所温度",            "description":"",            "tagtype":"温度",            "engunit":"℃",            "datatype":"1",            "minraw":"45",            "maxraw":"-5",            "loalarmlimit":"34",            "hialarmlimit":"0"        }    ]}

代码解析：

package yk.bigdata.dl.ias.fileParse;import org.json.JSONArray;import org.json.JSONObject;/** * @Author: cjj * @Date: Created in 10:43 2019/7/16 * @Description: 解析json数据 */public class TagValueJsonFileParse {    public static void main(String[] args) {        JsonParse();    }    public static String JsonParse(){        String jsonStr ="{'totalpages':'1','currpage':'1','totalrecords':'31','griddata':[{'tagkey':'YK011011012','unitkey':'YK01101',},{'tagkey':'YK011011225','unitkey':'YK01102',}]}";        // 因为json字符串是大括号包围，所以用JSONObject解析        JSONObject jsonObj = new JSONObject(jsonStr);        // 获取数组        JSONArray jsonArr = jsonObj.getJSONArray("griddata");        // 遍历数组里面的json        for(int i=0;i

3.代码实例（二）

json字符串的格式是：[{k:v},{k:v},{k:v}]

[     {"iconCls":"","children":[],"text":"断电状态"},     {"iconCls":"","children":[],"text":"风门"},     {"iconCls":"","children":[],"text":"风速"},     {"iconCls":"","children":[],"text":"风筒开关"},     {"iconCls":"","children":[],"text":"负压"},     {"iconCls":"","children":[],"text":"激光甲烷"},     {"iconCls":"","children":[],"text":"甲烷"},     {"iconCls":"","children":[],"text":"局扇"},     {"iconCls":"","children":[],"text":"馈电状态"},     {"iconCls":"","children":[],"text":"温度"},     {"iconCls":"","children":[],"text":"一氧化碳"},     {"iconCls":"","children":[],"text":"主扇"}]

代码解析：

JSONObject jsonObject;        JSONArray jsonArray = new JSONArray(jsonStr); // 直接解析成数组        for(int i=0;i