Stram读取网络文件

package net.itdos.junit;


import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;



import org.junit.Test;

public class Internet {
@Test 
public void getImg() throws Exception{
String urlPath = "http://i2.sinaimg.cn/blog/219/2010/0121/U3370P346T219D10F5601DT20110721151019.jpg";
URL url = new URL(urlPath);
HttpURLConnection httpURLConnection= (HttpURLConnection)url.openConnection();
httpURLConnection.setConnectTimeout(10*10000);
InputStream is = httpURLConnection.getInputStream();
byte[] data = readStream(is);
File file = new File("xx.png");
FileOutputStream fos = new FileOutputStream(file);
fos.write(data);
fos.close();
}
public byte[] readStream(InputStream inputStream) throws Exception{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = -1;
while((len = inputStream.read(buffer)) != -1){
baos.write(buffer,0,len);
}
baos.close();
inputStream.close();
return baos.toByteArray();
}

}