java 从网站下载图片到本地

java从网站上下载图片的思路：

1.通过url类得到浏览器的输入的文件流

2.复制制定的文件

public static void download(String urlString, String filename,String savePath) throws Exception {

URL url = new URL(urlString);

URLConnection con = url.openConnection();

InputStream is = con.getInputStream();

File sf = new File(savePath);

OutputStream os = new FileOutputStream(sf.getPath() + File.separator + "a.jpg");

int len = 0;

byte[] bs = new byte[1024];

while ((len = is.read(bs) )!= -1) {

os.write(bs,0,len);

}

is.close();

os.close();

}