java json 转义字符_java Json 串中的转义字符？

一：解析普通json

1：不带转化字符

格式{"type":"ONLINE_SHIPS","message":{"currentTime":1400077615368,"direction":0,"id":1,"latitude":29.5506,"longitude":106.6466}}

JSONObject jsonObject = new JSONObject(jsonstr).getJSONObject("message");

System.out.println("currentTime:"+jsonObject.get("currentTime"));

System.out.println("direction:"+jsonObject.get("direction"));

System.out.println("latitude:"+jsonObject.get("latitude"));

System.out.println("longitude:"+jsonObject.get("longitude"));

jsonarray

JSONObject jo = ja.getJSONArray("cargoList").getJSONObject(0);

2:带转义字符的json格式

{"type":"ONLINE_SHIPS","message":"{\"currentTime\":1400077615368,\"direction\":0,\"id\":1,\"latitude\":29.5506,\"longitude\":106.6466}"}

其实也很简单，先把它转化成字符串就可以了

JSONObject jsonObject = new JSONObject(jsonstr);

//先通过字符串的方式得到,转义字符自然会被转化掉

String jsonstrtemp = jsonObject.getString("message");

System.out.println("message:"+jsonstrtemp);

jsonObject = new JSONObject(jsonstrtemp);

System.out.println("currentTime:"+jsonObject.get("currentTime"));

System.out.println("direction:"+jsonObject.get("direction"));

System.out.println("latitude:"+jsonObject.get("latitude"));

System.out.println("longitude:"+jsonObject.get("longitude"));

二：遍历Json对象

JSONObject ports = ja.getJSONObject("ports");

Iterator keys = ports.keys();

while(keys.hasNext()){

String key=keys.next();

String value = ports.getString(key);

}

三：使用Gjson,json与对象相互转化

使用Gson轻松将java对象转化为json格式

String json = gson.toJson(Object);//得到json形式的字符串

User user = gson.fromJson(json,User.class);//得到对象

转化成list

import java.util.List;

import com.google.gson.Gson;

import com.google.gson.reflect.TypeToken;

import com.lc.function.Action;

import com.lc.models.Groups;

public class MapSearch {

private void ParseData(String _data)

{

Gson gson = new Gson();

List ps = gson.fromJson(_data, new TypeToken>(){}.getType());

System.out.println(ps.get(0).getGroup_name());

}

}