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 block

			e.printStackTrace();

		} catch (IOException e) {

			// TODO Auto-generated catch block

			e.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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