GsonWithoutObject 没有对象(脱离对象) 直接提取 ... gson json

GsonWithoutObject 脱离对象, 直接提取

package temp;

import tool.FileTool;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class GsonWithoutObjectDemo {

    public static void main(String[] args)  throws Exception{
        String text = FileTool.readFile("file/GsonWithoutObjectDemo.txt");

        JsonParser jsonParser = new JsonParser();//解析器
        JsonElement element = jsonParser.parse(text);//解析
        JsonObject jsonObj = element.getAsJsonObject();//转换成JsonObject

        System.out.println("jsonObj : "+jsonObj.toString());//jsonObject内容
        System.out.println("jsonObj 是否有该属性 : "+ jsonObj.has("PACKET"));//判断jsonObject 是否有PACKET属性存在

        String propertyValue =
                jsonObj.get("PACKET"). getAsJsonObject().
                            get("BODY").   getAsJsonObject().
                            get("PERSON").getAsJsonArray().get(0).getAsJsonObject().
                            get("NAME").toString();

        System.out.println("propertyValue="+propertyValue);
    }
}

file/GsonWithoutObjectDemo.txt 的gson内容

{
  "PACKET": {
    "BODY": {
        "PERSON": [
          {
            "NAME": "bobo",
            "AGE": "18"
          },
           {
            "NAME": "sisi",
            "AGE": "33"
          }
        ]
    },
    "HEAD": {
      "TYPE": "I",
      "USERID": "50000001"
    }
  }
}

打印结果:

从文件读取内容如下 : {  "PACKET": {    "BODY": {        "PERSON": [          {            "NAME": "ccc111",            "AGE": "18"          },           {            "NAME": "cccc222",            "AGE": "33"          }        ]    },    "HEAD": {      "TYPE": "I",      "USERID": "50000001"    }  }}
jsonObj : {"PACKET":{"BODY":{"PERSON":[{"NAME":"ccc111","AGE":"18"},{"NAME":"cccc222","AGE":"33"}]},"HEAD":{"TYPE":"I","USERID":"50000001"}}}
jsonObj 是否有该属性 : true
propertyValue="ccc111"

参考:

http://www.cnblogs.com/kunpengit/p/4001680.html