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;

public class test {
  public static void main(String[] args) throws Exception {
    
    //第一种格式
	  
    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
	  
    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
		
    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
		 
    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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