异常阅读http流
问题描述:
下面粘贴的代码获得一个异常,说... InputStream in = new BufferedInputStream(urlConnection.getInputStream());
这是一个IO异常,说:java.net.UnknownHostException:www.android.com异常阅读http流
我检查,这是一个有效的URL。我从HttpURLConnection上的android文档中获得了原始代码,但我必须修复文档代码中的一些错误。
为什么我会得到这个异常? 感谢, 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();
}
}
答
请问您的应用程序有上网?试试这个在您的AndroidManaifest.xml文件
<uses-permission android:name="android.permission.INTERNET" />