正则表达式 抓取网页面上所有图片

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->package com.roadway.test;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TeskSRC {
    public String getHtmlCode(String httpUrl) {
        String htmlCode = "";
        try {
            InputStream in;
            URL url = new java.net.URL(httpUrl);
            HttpURLConnection connection = (HttpURLConnection) url
                    .openConnection();
            connection = (HttpURLConnection) url.openConnection();
            connection.setRequestProperty("User-Agent", "Mozilla/4.0");
            connection.connect();
            in = connection.getInputStream();
            byte[] buffer = new byte[512];
            int length = -1;
            while((length = in.read(buffer,0,512)) != -1){
                htmlCode += new String(buffer,0,length);
            }
        } catch (Exception e) {
        }
        if(htmlCode == null){
            return "";
        }
        return htmlCode;
    }
    public static void main(String[] args){
        TeskSRC ts = new TeskSRC();
        String searchImgReg = "(?x)(src|SRC|background|BACKGROUND)=('|\")(http://([\\w-]+\\.)+[\\w-]+(:[0-9]+)*(/[\\w-]+)*(/[\\w-]+\\.(jpg|JPG|png|PNG|gif|GIF)))('|\")";
        String content = ts.getHtmlCode("http://www.163.com");
        Pattern pattern = Pattern.compile(searchImgReg);
        Matcher matcher = pattern.matcher(content);
        while(matcher.find()){
            System.out.println(matcher.group(3));
        }
        //searchImgReg  = "(?x)(src|SRC|background|BACKGROUND)=('|\")/?(([\\w-]+/)*([\\w-]+\\.(jpg|JPG|png|PNG|gif|GIF)))('|\")";
    }
}