网络请求工具类HttpUtil

import android.content.Context;
import android.os.AsyncTask;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import myapplication.myapplication.jiekou.HttpCallBack;
/**
 * Created by Administrator on 2017/10/18.
 */
public class HttpUtil {
public static void requestDataByHttp(final String path, Context context, final HttpCallBack callBack){
new AsyncTask<Void, Void, String>(){
@Override
protected String doInBackground(Void... voids) {
try {
URL url = new URL(path);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
int responseCode = connection.getResponseCode();
if(responseCode == 200){
InputStream inputStream = connection.getInputStream();
String s = streamToString(inputStream, "utf-8");
return s;
}
                } catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
callBack.onRequestComplete(s);
}
        }.execute();
}
private static String streamToString(InputStream inputStream,String charset) {
try {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream,charset);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String s = null;
StringBuilder builder = new StringBuilder();
while ((s = bufferedReader.readLine()) != null){
builder.append(s);
}
bufferedReader.close();
return builder.toString();
} catch (Exception e) {
e.printStackTrace();
}
return  null;
}
}

接口：

/**
 * Created by Administrator on 2017/10/18.
 */
public interface HttpCallBack {
void onRequestComplete(String json);
}