java的JsonObject对象提取值方法

实例如下所示：

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+"------------");
    }

  }
  }

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