复制代码 代码如下:

URL ur = new URL("http://localhost:8080/first/he.txt");

HttpURLConnection conn = (HttpURLConnection) ur.openConnection();//URL.openConnection() -- >return URLCommection(直接子类HttpURLConnection)

conn.setRequestProperty("Range", "bytes=5-");//设置请求参数属性，设置下载从第5个字节开始下载；

InputStream in = conn.getInputStream();

int len = 0;

byte[] buf = new byte[1024];

FileOutputStream out = new FileOutputStream("d:a.txt");

while ((len = in.read(buf)) > 0) {

out.write(buf, 0, len);

}

in.close();

out.close();