Question

下面粘贴的代码会在行上显示异常... InputStream in = new BufferedInputStream（urlConnection.getInputStream（））;
这是一个IO异常，上面写着：java.net.UnknownHostException：www.android.com

我查了一下，这是一个有效的网址。我从HttpURLConnection上的android文档中获取了原始代码，尽管我必须修复文档代码中的几个错误。

为什么我会收到此异常？谢谢，加里

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.Activity;
import android.os.Bundle;

public class HelloAndroid extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        HttpURLConnection urlConnection = null;

            try 
            {
                URL url = new URL("http://www.android.com/");   
                urlConnection = (HttpURLConnection) url.openConnection();
                InputStream in = new BufferedInputStream(urlConnection.getInputStream());     
                readStream(in);
            } 
            catch (MalformedURLException e) 
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 
            catch (IOException e) 
            {   
                e.printStackTrace();
            }  

            finally 
            {     
                urlConnection.disconnect();   
            } 
    }

Answer 1

您的应用是否可以访问互联网？请在AndroidManaifest.xml文件中尝试此操作

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

异常阅读http Stream

1 个答案: