java多线程的爬虫撸177图片~~

#来个多线程的

主程序
package cn.fu.threadimage;import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;public class CrawImage {static String url = "http://www.177picaa.pw/html/2017/12/1610354.html"+"/";static String file;//下载存放路径static Integer num;//分页static Integer subcut;//图片命名截取imgurl,仅仅针对当前网站适用;static {try {Document document = Jsoup.parse(new URL(url), 5000);//获取标题Element element = document.getElementsByClass("entry-title").first();file = "F://paqu/" + element.text();//判断目标文件夹是否存在File files = new File(file);if (!files.exists()) {files.mkdirs();}Elements select = document.select(".page-links>a");//获取分页num = select.size();//177pic vpn访问网:www.177pic.pw 内网:www.177picaa.pwif (url.contains("aa")) {subcut = 40;} else {subcut = 38;}} catch (IOException e) {e.printStackTrace();}}public static void main(String[] args) throws Exception {try {//创建一个缓冲池ExecutorService pool = Executors.newCachedThreadPool();//设置其容量为9pool = Executors.newFixedThreadPool(9);for (int i = 1; i < num; i++) {//获取指定网页源码Document document = Jsoup.connect(url + i).userAgent("Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31").get();Elements pages = document.select(".page-links>a");getUrl(document, pool);}pool.shutdown();} catch (Exception e) {System.out.print(e);}}public static void getUrl(Document document, ExecutorService pool) {Elements elements = document.getElementsByClass("alignnone");for (Element el : elements) {String imageUrl = el.attr("data-lazy-src");if (imageUrl != "") {//下载图片pool.execute(new DownloadImage(imageUrl, file, subcut));System.out.println(imageUrl);}}}
}

下载工具
package cn.fu.threadimage;import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;public class DownloadImage implements Runnable {String file;//下载的目标路径String downUrl;int subcut;public DownloadImage(String downUrl, String file,int subcut) {this.downUrl = downUrl;this.file = file;this.subcut=subcut;}public void run() {InputStream is;FileOutputStream out;try {URL url = new URL(downUrl);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");is = connection.getInputStream();// 创建文件File fileofImg = new File(file + "/" + downUrl.substring(subcut));out = new FileOutputStream(fileofImg);int i = 0;while ((i = is.read()) != -1) {out.write(i);}is.close();out.close();} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}