Java利用给定的地址下载该页面图片

<p>大致的内容是：</p><p>利用页面链接获得内容，再通过正则表达式匹配到图片的网络地址，最后根据图片的名称写入到根目录文件中。</p><p>接下来我们看代码。</p>

import java.io.BufferedReader;

import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.*;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class URLTest {

	public static void main(String[] args) throws Exception {
		picTest();
	}
//根据获得的图片地址写入文件
public static void btyeTest(String pic) throws Exception {
		URL url = new URL(pic);
		InputStream is = url.openStream();
		String fileName = pic.substring(pic.lastIndexOf("/") + 1);
		FileOutputStream fos = new FileOutputStream(fileName);
		byte[] buffer = new byte[8192];
		int len = -1;
		while ((len = is.read(buffer)) != -1) {
			fos.write(buffer, 0, len);
		}
		fos.close();
	}

	public static void picTest() throws Exception {
		URL url = new URL("http://www.moko.cc/focus/681/info.html");
		InputStream is = url.openStream();
		// 读取返回内容
		BufferedReader br = new BufferedReader(new InputStreamReader(is));
		String line = null;
		StringBuffer content = new StringBuffer();
		while ((line = br.readLine()) != null) {
			content.append(line);
		}
		String html = content.toString().replaceAll("\\s+", " ");
		// 找出html中的所有jpg图片的地址
		Pattern p = Pattern.compile(
				"https?:\\/\\/(([a-zA-Z0-9_-])+(\\.)?)*(:\\d+)?(\\/((\\.)?(\\?)?=?&?[a-zA-Z0-9_-](\\?)?)*)*\\.jpg");
		Matcher m = p.matcher(html);
		// 创建一个set集合，用于取出重复的图片地址
		Set<String> urls = new HashSet<>();
		while (m.find()) {
			urls.add(m.group());
		}
		for (String ul : urls) {
			btyeTest(ul);//根据图片地址写到根目录

		}
	}
}