Solve the problem that andriod fails to use httpurlconnection

An exception, access denied, is thrown when httpurlconnection is used to connect to the server in the android activity. The first thought was about permissions. Then, add the Internet permission to manifest:

<uses-permission android:name="android.permission.INTERNET" />

Or throw an exception! Check the exception information, which is related to strictmode. Think about the Android version, and add the following code in the activity to solve the problem:

StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());

Complete code:

package com.example.quhao_test;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import android.annotation.TargetApi;import android.app.Activity;import android.os.Build;import android.os.Bundle;import android.os.StrictMode;import android.view.Menu;import android.widget.TextView;public class MainActivity extends Activity {    @TargetApi(Build.VERSION_CODES.GINGERBREAD)@Override    protected void onCreate(Bundle savedInstanceState) {        System.out.println("xxxxxxxxxxxxxxx");            super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                String strUrl = "http://146.11.24.100:9081/testcontroller/test1?arg=2222";        StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());        URL url = null;        try {url = new URL(strUrl);System.out.println(url.getPort());HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();InputStreamReader in = new InputStreamReader(urlConn.getInputStream());BufferedReader br = new BufferedReader(in);String result = "";String readerLine = null;while((readerLine=br.readLine())!=null){result += readerLine;}in.close();urlConn.disconnect();System.out.println("r:"+result);TextView textView = (TextView)this.findViewById(R.id.result);textView.setText(result);} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}            }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    }

Original article, reprinted please specify the Source: withiter