用java下载html页面

import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;

public class Tess {
    public static void main(String[] args) {
        //使用URL类的openStream()成员方法获取URL指定的网上信息
        String str = "https://www.xxx.com/xs/250/250006/";//目标资源的部分url
        try {
            //URL对象可以访问已知URL的网上资源
            URL url = null;
            int begin = 504457;
            for (int i = 0; i < 62; i++) {
                int num = begin + i;
                String targetURL = str + num + ".html";//网上资源的完整url
                url = new URL(targetURL);//形参是网上资源的网址
                //用openStream()会在网上资源服务器和Java客户端之间建立输入字节流对象
                InputStream inputStream = url.openStream();
                //为了IO效率高，用缓冲字符流把网上资源读入内存
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                //把jvm内存数据输出到磁盘中指定位置
                String locate="C:\\Users\\use\\Desktop\\novel\\"+(i+1)+".html";
                BufferedWriter out = new BufferedWriter(new FileWriter(locate));
                String context;
                while ((context = bufferedReader.readLine()) != null) {//判断输入流是否读到文件末尾
                    //把网上信息读入jvm内存中
                    //把内存内容输出到文件中
                    out.write(context);
                    out.newLine();//向文件中写入一个回车符号
                }
                inputStream.close();
                bufferedReader.close();
                out.close();
            }
        } catch (MalformedURLException e) {
            System.out.println("Can't get URL:" + e.getMessage());
            e.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
    }
}