java的JsonObject对象提取值

<code class="language-java">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+"------------");  

        }  

  

       

      

    }  

  

    }</code>