java 实现图片下载

import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
/**
* 下载图片
* @author vinegar
*/
public class DownImage {

public static void download(String urlString, String filename) throws Exception {
System.out.println("download xml start.......");
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();
System.out.println("download xml over.......");
}
}