Json 串中的轉義字符解析

一：解析普通json

1：不帶轉化字符

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:帶轉義字符的json格式

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

其實也很簡單，先把它轉化成字符串就可以了

JSONObject jsonObject = new JSONObject(jsonstr);
//先通過字符串的方式得到,轉義字符自然會被轉化掉
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：遍歷Json對象

JSONObject ports = ja.getJSONObject("ports");
Iterator<String> keys = ports.keys();
while(keys.hasNext()){
String key=keys.next();
String value = ports.getString(key);
}

三：使用Gjson,json與對象相互轉化

使用Gson輕松將java對象轉化為json格式

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

User user = gson.fromJson(json,User.class);//得到對象

轉化成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<Groups> ps = gson.fromJson(_data, new TypeToken<List<Groups>>(){}.getType());
System.out.println(ps.get(0).getGroup_name());
}
}