java的JsonObject对象提取值

import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONArray;import com.alibaba.fastjson.JSONObject;import io.swagger.models.auth.In;import java.io.IOException;import java.security.KeyManagementException;import java.security.NoSuchAlgorithmException;import java.util.Iterator;/** * Created by Administrator on 2017/4/21. */public class test {    public static void main(String[] args) throws Exception {              //第一种格式   /*** [    {        "data ": [            {                "building_id ": "*** ",                "building_num ": "** ",                "door_name ": "** ",                "electric ": "** ",                "room_name ": "** "            }        ],        "success ": true    }]*/        String s="[{\"success\":true,\"data\":[{\"building_id\":\"***\",\"building_num\":\"**\",\"room_name\":\"**\",\"door_name\":\"**\",\"electric\":\"**\"}]}]" ;        String b= s.substring(0,s.length()-1);        String c=b.substring(1, b.length());        System.out.println(b+"b___");        JSONObject jsonx = JSON.parseObject(c);        JSONArray ja = jsonx.getJSONArray("data");        for (int i = 0; i < ja.size(); i++) {            JSONObject jo = ja.getJSONObject(i);            String building_id = jo.getString("building_id");            System.out.println(building_id+"building_id>>>>>");        }       //第二种格式   /** * [    {        "password ": "*1234567890 ",        "success ": "true "    }] */        String s="[{\"success\":\"true\",\"password\":\"*1234567890\"}]";        String b= s.substring(0,s.length()-1);        String c=b.substring(1, b.length());        System.out.println(c+"c___");        JSONObject reagobj = JSONObject.fromObject(c);        String name = reagobj.getString("password");        System.out.println(name+"name,,,,,,");        String password = jm.getString("password");        System.out.println(password);        System.out.println("看看有没有值"+password);          //第三种格式/*** {    "data ": {        "access_token ": "5a7040ccf66bafd06acd39b6f61c19230eaba426755509646d6da23ddd9fb206 ",        "expires_second ": 36000    },    "rlt_code ": "HH0000 ",    "rlt_msg ": "成功 "} */        String res="{\"data\":{\"access_token\":\"5a7040ccf66bafd06acd39b6f61c19230eaba426755509646d6da23ddd9fb206\",\"expires_second\":36000},\"rlt_code\":\"HH0000\",\"rlt_msg\":\"成功\"}";        JSONObject jsonObject= JSON.parseObject(res);        String data = jsonObject.getString("data");        JSONObject jsondata= JSON.parseObject(data);        String token = jsondata.getString("access_token");//第四种格式 /** * { "data ":{ "total ":23, "start ":0, "total_page ":3, "rows ":[{ "op_way ": "3 ", "user_mobile ": "15321918571 ", "op_time ":1493881391976, "pwd_no ":30},{ "op_way ": "1 ", "op_time ":1493880995000, "pwd_no ":31}], "current_page ":1, "page_size ":10}, "rlt_code ": "HH0000 ","rlt_msg ": "成功 "}*/        String res="{\"data\":{\"total\":23,\"start\":0,\"total_page\":3,\"rows\":[{\"op_way\":\"1\",\"op_time\":1493884964000,\"pwd_no\":31},{\"op_way\":\"3\",\"user_mobile\":\"18518517491\",\"op_time\":1493884615032,\"pwd_no\":30},{\"op_way\":\"3\",\"user_mobile\":\"18518517491\",\"op_time\":1493883836552,\"pwd_no\":30},{\"op_way\":\"1\",\"op_time\":1493883294000,\"pwd_no\":31},{\"op_way\":\"1\",\"op_time\":1493883256000,\"pwd_no\":31},{\"op_way\":\"3\",\"user_mobile\":\"15321918571\",\"op_time\":1493883015371,\"pwd_no\":30},{\"op_way\":\"1\",\"op_time\":1493882007000,\"pwd_no\":31},{\"op_way\":\"3\",\"user_mobile\":\"15321918571\",\"op_time\":1493881498520,\"pwd_no\":30},{\"op_way\":\"3\",\"user_mobile\":\"15321918571\",\"op_time\":1493881391976,\"pwd_no\":30},{\"op_way\":\"1\",\"op_time\":1493880995000,\"pwd_no\":31}],\"current_page\":1,\"page_size\":10},\"rlt_code\":\"HH0000\",\"rlt_msg\":\"成功\"}";        JSONObject jsonObject= JSON.parseObject(res);        String data = jsonObject.getString("data");        JSONObject jsonObjects= JSON.parseObject(data);        JSONArray ja = jsonObjects.getJSONArray("rows");        for (int i = 0; i < ja.size(); i++) {            JSONObject jo = ja.getJSONObject(i);            String op_way = jo.getString("op_way");            String op_time = jo.getString("op_time");            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");            long lt = new Long(op_time);            Date date = new Date(lt);            res = simpleDateFormat.format(date);            String pwd_no = jo.getString("pwd_no");            String user_mobile = jo.getString("user_mobile");            System.out.println(op_way+res+pwd_no+user_mobile+"------------");        }             }    }