Java读取网页内容并下载图片的实例

很多人在第一次了解数据采集的时候，可能无从下手，尤其是作为一个新手，更是感觉很是茫然，所以，在这里分享一下自己的心得，希望和大家一起分享技术，如果有什么不足，还请大家指正。写出这篇目的，就是希望大家一起成长，我也相信技术之间没有高低，只有互补，只有分享，才能使彼此更加成长。

示例代码：

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:///";GetContentPicture gcp = new GetContentPicture();gcp.get(url);}}

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