Java读取网页内容并下载图片的实例

import java.io.BufferedInputStream;import java.io.BufferedReader;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.net.MalformedURLException;import java.net.URL;import java.util.regex.Matcher;import java.util.regex.Pattern;public class GetContentPicture {public void getHtmlPicture(String httpUrl) {URL url;BufferedInputStream in;FileOutputStream file;try {  System.out.println("取网络图片");  String fileName = httpUrl.substring(httpUrl.lastIndexOf("/"));  String filePath = "./pic/";  url = new URL(httpUrl);  in = new BufferedInputStream(url.openStream());  file = new FileOutputStream(new File(filePath+fileName));  int t;  while ((t = in.read()) != -1) {  file.write(t);  }  file.close();  in.close();  System.out.println("图片获取成功");} catch (MalformedURLException e) {  e.printStackTrace();} catch (FileNotFoundException e) {  e.printStackTrace();} catch (IOException e) {  e.printStackTrace();}}public String getHtmlCode(String httpUrl) throws IOException {String content ="";URL uu = new URL(httpUrl); // 创建URL类对象BufferedReader ii = new BufferedReader(new InputStreamReader(uu  .openStream())); // //使用openStream得到一输入流并由此构造一个BufferedReader对象String input;while ((input = ii.readLine()) != null) { // 建立读取循环，并判断是否有读取值  content += input;}ii.close();return content;}public void get(String url) throws IOException {String searchImgReg = "(?x)(src|SRC|background|BACKGROUND)=('|/")/?(([//w-]+/)*([//w-]+//.(jpg|JPG|png|PNG|gif|GIF)))('|/")";String searchImgReg2 = "(?x)(src|SRC|background|BACKGROUND)=('|/")(http://([//w-]+//.)+[//w-]+(:[0-9]+)*(/[//w-]+)*(/[//w-]+//.(jpg|JPG|png|PNG|gif|GIF)))('|/")";String content = this.getHtmlCode(url);System.out.println(content);Pattern pattern = Pattern.compile(searchImgReg);Matcher matcher = pattern.matcher(content);while (matcher.find()) {  System.out.println(matcher.group(3));  this.getHtmlPicture(url+matcher.group(3));}pattern = Pattern.compile(searchImgReg2);matcher = pattern.matcher(content);while (matcher.find()) {  System.out.println(matcher.group(3));  this.getHtmlPicture(matcher.group(3));}// searchImgReg =// "(?x)(src|SRC|background|BACKGROUND)=('|/")/?(([//w-]+/)*([//w-]+//.(jpg|JPG|png|PNG|gif|GIF)))('|/")";}public static void main(String[] args) throws IOException {String url = "http://www.baidu.com/";GetContentPicture gcp = new GetContentPicture();gcp.get(url);}}