这是一个从网页源文件中得到链接的实现代码，和大家分享一下：

import Java.net.*;
import Java.io.*;
import Java.util.*;

class ScanPage{
    private static String strPage;
    private String strUrl;
    private String fileName;
    public void setURL(String strUrl){
        this.strUrl=strUrl;
    }
    //从地址中得到文件名
    public void setFileName(){
        int i;
        char ch;
        i=strUrl.length();
        ch=strUrl.charAt(--i);
        while(ch!=’/’ && ch>0)
            ch=strUrl.charAt(--i);
        fileName=strUrl.substring(i);
    }
    //下载网页
    public void downFile()throws IOException{ 
        URL url =new URL(strUrl);
        InputStream is =url.openStream();
        OutputStream os =new FileOutputStream(fileName);
        byte[] buffer =new byte[512];
        int len;
        while((len =is.read(buffer))!=-1) 
            os.write(buffer,0,len);
        is.close();
        os.close();
    }
    //读文件
    public void readFile() throws IOException {
        StringBuffer sb = new StringBuffer();
        BufferedReader in =new BufferedReader(new FileReader(fileName));
        String s;

       while((s = in.readLine()) != null) {
            sb.append(s);
            sb.append("\n");
        }
        in.close();
        strPage=sb.toString();
    }
    public String getTitle(){
        
        return "";
    }