实现java读取网页内容并下载网页中出现的图片

package com;

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)))(%20|/")";

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);
}
}