手动保存网页里的图片太麻烦，我直接一手Java批量存一下图片

今天想保存网页上的数学公式，图片好多保存好麻烦，所以…请看整活!!!

Java简单小爬虫
运用知识：URL类、数据流、正则、文件

package blank;

/**
 * @author blank
 */
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Spider {
    
    
	/**
	 * 获取网站内容
	 * 
	 * @param urlStr
	 * @param charset
	 * @return
	 * @throws IOException
	 */
	public static String getURLContent(String urlStr, String charset) throws IOException {
    
    
		URL url = new URL(urlStr);
		BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream(), Charset.forName(charset)));
		StringBuilder sb = new StringBuilder();
		String temp = "";
		while ((temp = reader.readLine()) != null) {
    
    
			sb.append(temp);
		}
		reader.close();
		return sb.toString();
	}

	/**
	 * 保存图片
	 * 
	 * @param urlStr
	 * @throws IOException
	 */
	public static void savePic(String urlStr, String dirStr) throws IOException {
    
    
		URL url = new URL(urlStr);
		InputStream in = url.openStream();
		String filename = dirStr + urlStr.substring(urlStr.lastIndexOf("/") + 1);
		File dir = new File(dirStr);
		if (!dir.exists()) {
    
    
			dir.mkdirs();
		}
		System.out.println(filename);
		File file = new File(filename);
		if (!file.exists()) {
    
    
			file.createNewFile();
		}
		FileOutputStream fos = new FileOutputStream(file);
		byte[] b = new byte[1024];
		int len;
		while ((len = in.read(b)) != -1) {
    
    
			fos.write(b, 0, len);
		}
		fos.close();
		in.close();
	}

	public static void main(String[] args) throws IOException {
    
    
		// 获取网页
		String urlContent = getURLContent("http://video.kaola100.com/yhcy/yhff/12322", "utf-8");
		// 准备正则
		Pattern p = Pattern.compile("<img(.+?)/>");
		// 匹配并处理
		Matcher m = p.matcher(urlContent);
		int count = 0;
		while (m.find()) {
    
    
			String temp = m.group(1);
			temp = "http://video.kaola100.com" + temp.substring(temp.indexOf("\"/") + 1, temp.lastIndexOf("\""));
			System.out.println("下载" + temp + "...");
			savePic(temp, "D:/math/");
			count++;
		}
		System.out.println("共保存" + count + "个图片");
	}
}

好活！！！运行即保存，但这代码并不具有通用性，对于其他网页的处理上需要进行稍加改动，此处不予赘述~

运行后效果