java实现将网上页面下载到本地

import java.io.BufferedInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.net.HttpURLConnection; import java.net.URL; public class T implements Runnable { private static final int BUFFER_SIZE = 4096; private String destUrl; private String fileName; public T(String destUrl, String fileName) { this.destUrl = destUrl; int i = destUrl.lastIndexOf("/"); this.fileName = fileName + destUrl.substring(i + 1)+".html"; } public void run() { try { saveToFile(destUrl, fileName); System.out.println("文件：" + destUrl + "下载完成，保存为" + fileName); } catch (IOException e) { System.out.println("文件下载失败，信息：" + e.getMessage()); } } // 将网络文件保存为本地文件的方法 // @param destUrl // @param fileName // @throws IOException public void saveToFile(String destUrl, String fileName) throws IOException { FileOutputStream fos = null; BufferedInputStream bis = null; HttpURLConnection httpconn = null; URL url = null; byte[] buf = new byte[BUFFER_SIZE]; int size = 0; // 建立链接 url = new URL(destUrl); httpconn = (HttpURLConnection) url.openConnection(); // 连接指定的资源 httpconn.connect(); // 获取网络输入流 bis = new BufferedInputStream(httpconn.getInputStream()); // 建立文件 fos = new FileOutputStream(fileName); System.out.println("正在获取链接[" + destUrl + "]的内容\n将其保存为文件[" + fileName+ "]"); // 保存文件 while ((size = bis.read(buf)) != -1) fos.write(buf, 0, size); fos.close(); bis.close(); httpconn.disconnect(); } public static void main(String[] args) { Thread th = new Thread( new T("http://www.baidu.com","c:/")); th.start(); } }