解决Andriod使用HttpURLConnection 失败问题

在Android的Activity中使用HttpURLConnection连接到服务端时抛出异常，Access denied。第一个想到是权限问题。然后就尝试将INTERNET权限加上：在Manifest中加上：

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

还是抛异常！看异常信息，和StrictMode有关，想到和Android版本有关，然后在Activity中加上如下代码，问题解决：

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

完整代码：

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;    }    }

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