java类——下载文件

 package tt;

import java.io.*;
import java.net.*;
import java.util.*;

import org.apache.commons.httpclient.HttpException;

public class DownFile {
 private static int buffer_size = 8096;//缓冲区大小
 private Vector vdownload = new Vector();//url列表
 private Vector vfilelist = new Vector();//下载后的保存文件名列表
 
 /**
  * 构造方法
  */
 public DownFile() {
 }
 /**
  * 清除下载列表
  */
 public void resetlist() {
  vdownload.clear();
  vfilelist.clear();
 }
 /**
  * 增加下载列表项
  *
  * @param url string
  * @param filename string
  */
 public void additem(String url, String filename) {
  vdownload.add(url);
  vfilelist.add(filename);
 }
 /**
  * 根据列表下载资源
  */
 public void downloadbylist() {
  String url = null;
  String filename = null;

//  按列表顺序保存资源
  for (int i = 0; i < vdownload.size(); i++) {
   url = (String) vdownload.get(i);
   filename = (String) vfilelist.get(i);
   try {
    savetofile(url, filename);
   }
   catch (IOException err) {
    Func.cout("资源[" + url + "]下载失败!!!");
   }
  }
 }

 /**
  * 将http资源另存为文件
  *
  * @param desturl string
  * @param filename string
  * @throws exception
  */
 public void savetofile(String desturl, String filename) throws IOException {
  FileOutputStream fos = null;
  BufferedInputStream bis = null;
  HttpURLConnection httpurl = null;
  URL url = null;
  byte[] buf = new byte[buffer_size];
  int size = 0;

//  建立链接
  url = new URL(desturl);
  httpurl = (HttpURLConnection) url.openConnection();
//  连接指定的资源
  httpurl.connect();
//  获取网络输入流
  bis = new BufferedInputStream(httpurl.getInputStream());
//  建立文件
  fos = new FileOutputStream(filename);
  Func.cout("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();
  httpurl.disconnect();
  Func.cout("下载成功！");
 }
 /**
  * 设置代理服务器
  *
  * @param proxy string
  * @param proxyport string

  public void setproxyserver(String proxy, String proxyport) {
//  设置代理服务器
  if(debug)System.getProperties().put("proxyset", "true");
  if(debug)System.getProperties().put("proxyhost", proxy);
  if(debug)System.getProperties().put("proxyport", proxyport);
  } */
 /**
  * 设置认证用户名与密码
  *
  * @param uid string
  * @param pwd string

  public void setauthenticator(String uid, String pwd) {
  authenTicator.setdefault(new myAuthenticator(uid, pwd));
  }*/
 
 public static void main(String[] args) throws HttpException, IOException {
  
  String url = "http://www.engineeringvillage2.com.cn/controller/servlet/Controller?CID=quickSearchCitationFormat&database=1&searchWord1=liu ye xiang &section1=AU&yearselect=yearrange&startYear=1990&endYear=2008";  try {//下载存盘
   DownFile down = new DownFile();
   down.savetofile(url, "D:/test.html");
  }
  catch (Exception e) {
   Func.cout(e.getMessage());
   Func.coute("资源[" + url + "]下载失败!!!");
  }
  
  String html = null;
  
  try{//将下载的文件读入html
   FileInputStream fis=new FileInputStream("D:/test.html");
      int size = fis.available();
      byte b[] = new byte[size];
      if(fis.read(b,0,size)>0){
         html = new String(b);
      }
  }
  catch(Exception e) {
   Func.cout(e.getMessage());
   Func.coute("资源[" + "D:/test.html" + "]读取失败!!!");
  }
  
  System.out.println( html);
 }

}