程序代码：

    //打开网页
    public void getUrl() throws IOException {
        String urlString ="http://hnjtpc. url = new URL(urlString);
        BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));
        BufferedWriter writer = new BufferedWriter(new FileWriter("d:/page.html"));
        String line;
        while ((line = reader.readLine()) != null) {
            //可以对line内容进行URL提取，关注"<a" "href=\"", 对于以"/"开头的网址加上服务器地址,如 "http://baidu.com"
            writer.write(line);
            writer.write("\r\n");//保存的文件中，不分行，要额外分行
        }