下載

 import java.io.FileOutputStream;   
import java.io.InputStream;   
import java.io.OutputStream;   
import java.net.URL;   
import java.net.URLConnection;   
 
 
 
public class URLConnectionDownloader {   
 
public static void main(String[] args) throws Exception {   
download("http://www.laozizhu.com/images/logo.gif", "laozizhu.com.gif");   
}   

public static void download(String urlString, String filename) throws Exception {   
  
URL url = new URL(urlString);   
  
URLConnection con = url.openConnection();   
 
InputStream is = con.getInputStream();   
 
 
byte[] bs = new byte[1024];   
 
int len;   
 
OutputStream os = new FileOutputStream(filename);   
 
while ((len = is.read(bs)) != -1) {   
os.write(bs, 0, len);   
}   
  
os.close();   
is.close();   
}   
}