selenuim爬虫实战 (下)

SuperLOFTERDownloader7.java

package test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

import javax.swing.JOptionPane;

import org.openqa.selenium.By;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.Keys;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxBinary;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxOptions;
import org.openqa.selenium.interactions.Actions;

public class SuperLOFTERDownloader7 {
    // static String html;
    static int urlCount = 0;
    static String username = "fenchenyue";
    static String url = "http://" + username + ".lofter.com/view";
    static String picUrl;
    static boolean ifToBreak = false;
    static ArrayList<String> urlList = new ArrayList<String>();
    // 注意:目录路径必须以""结尾
    static String downloadToDir = "E:\爬虫\妹纸2\";

    public static void main(String[] args) {
        System.setProperty("webdriver.gecko.driver", "C:\Users\Jim\Desktop\GeckoDriver\geckodriver.exe");

        FirefoxOptions options = new FirefoxOptions();

        // 启动配置"不加载图片"
        options.addPreference("permissions.default.image", 2);

        // 启动参数"无界面"
        FirefoxBinary myBinary = new FirefoxBinary();
        myBinary.addCommandLineOptions("--headless");
        options.setBinary(myBinary);

        FirefoxDriver driver = new FirefoxDriver(options);
        driver.manage().timeouts().implicitlyWait(16, TimeUnit.SECONDS); // 隐式等待
        driver.get(url);

        // ((JavascriptExecutor)
        // driver).executeScript("document.querySelector('.m-txtsch').style.display="inline"");

        int givenNumber = Integer.parseInt(driver.findElementByCssSelector(
                "body > div.g-bdfull.g-bdfull-show.ztag > div.g-bdc.ztag > div.m-fbar.f-cb > div.schbtn.f-cb > div:nth-child(1) > div > div.txt > a.ztag.currt > span")
                .getAttribute("innerHTML"));

        Actions action = new Actions(driver);

        Timer timer = new Timer();
        timer.schedule(new TimerTask() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                action.sendKeys(/* driver.findElement(By.cssSelector("body")), */ Keys.END).perform();
            }
        }, 1, 700);

        /*
         * WebDriverWait wait = new WebDriverWait(driver, 256, 2048);
         * wait.until(ExpectedConditions .numberOfElementsToBe(By.
         * cssSelector("div.ztag > div.m-filecnt.m-filecnt-1 > ul > li"), number));
         */

        new Thread(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                int flag = JOptionPane.showConfirmDialog(null, "正在收集资源...
如果觉得时间过长,点击'是'提前中断", "是否中断",
                        JOptionPane.YES_NO_OPTION);
                if (flag == JOptionPane.YES_OPTION) {
                    ifToBreak = true;
                }
            }
        }).start();

        // 周期查询文档是否加载完或者用户选择中断
        String js = "let count=0;document.querySelectorAll('.g-bdc > div:nth-child(3) > div.m-filecnt.m-filecnt-1 > ul').forEach(function(e,i){count+=e.children.length});return count;";
        while (true) {

            long countFromJs = (long) ((JavascriptExecutor) driver).executeScript(js);
            System.out.println("已收集到资源数 : " + countFromJs);
            if (Math.abs((int) countFromJs - givenNumber) < 5 || ifToBreak) {
                break;
            }
            try {
                Thread.sleep(1600);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        timer.cancel();

        for (WebElement element : driver.findElements(
                By.cssSelector("div.ztag > div.m-filecnt.m-filecnt-1 > ul > li > a > div > div > img.realimg"))) {
            picUrl = element.getAttribute("src").split("\?")[0];
            System.out.println(picUrl);
            urlList.add(picUrl);
            urlCount++;

        }

        System.out.println("爬取到" + givenNumber + "篇文章中的" + urlCount + "张图的url");

        int flag = JOptionPane.showConfirmDialog(null, "核对url,是否开始下载?", "是否继续", JOptionPane.YES_NO_OPTION);
        if (flag == JOptionPane.NO_OPTION) {
            System.exit(0);
        } else if (flag == JOptionPane.YES_OPTION) {
            System.out.println("正在下载.....");
            try {
                Runtime.getRuntime().exec("explorer " + downloadToDir);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println("完成,成功下载了" + DownloadFromUrlList3.download(urlList, downloadToDir) + "张图");
            System.out.println("失败数:" + DownloadFromUrlList3.errCount);
        }
        // JOptionPane.showMessageDialog(null, "浏览器可以关闭了吗?");
        driver.quit();
        System.exit(0);
    }
}

DownloadFromUrlList3.java

package test;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;

public class DownloadFromUrlList3 {
    static private int count = 0;
    static ThreadGroup myThreadGroup = new ThreadGroup("myGroup");
    static picThread myThread;
    public static int errCount = 0;
    static long timeOut = 8 * 1000;

    public static synchronized int updateCount() {
        count++;
        return count;
    };

    public static int download(ArrayList<String> urlList, String dirPath) {
        if (new File(dirPath).exists()) {
            if (!new File(dirPath).isDirectory()) {
                System.out.println("ERROR!! THE PATH GIVEN ISN'T A DIRECTORY");
                return 0;
            }
        } else {
            new File(dirPath).mkdir();
        }

        for (String urlstr : urlList) {
            String myUrlStr = urlstr;
            myThread = new picThread(myThreadGroup, new Runnable() {

                @Override
                public void run() {
                    // TODO Auto-generated method stub
                    try {
                        URL url = new URL(myUrlStr);
                        BufferedInputStream is;
                        try {
                            // 网络流量一定要用高效的buffered
                            is = new BufferedInputStream(url.openStream());
                        } catch (Exception e) {
                            // TODO Auto-generated catch block
                            System.out.println("发现一个url资源出错:
" + myUrlStr);
                            errCount++;
                            return;
                        }
                        String extention = "." + HttpURLConnection.guessContentTypeFromStream(is).split("/")[1];
                        File file = new File(dirPath + updateCount() + extention);
                        ((picThread) Thread.currentThread()).file = file;
                        file.createNewFile();
                        OutputStream os = new FileOutputStream(file);
                        int len;
                        byte[] buffer = new byte[1024];
                        while ((len = is.read(buffer)) != -1) {
                            os.write(buffer, 0, len);
                        }
                        is.close();
                        os.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                }
            });
            myThread.urlStr = myUrlStr;
            myThread.start();
            // threadList.add(myThread);
            try {
                myThread.join(timeOut);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        /*
         * for (Thread iThread : threadList) { try { // 等待所有线程执行完毕 iThread.join(1000 *
         * 15); } catch (InterruptedException e) { e.printStackTrace(); } }
         */
        try {
            Thread.sleep(1024);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Thread[] activeThreads = new Thread[myThreadGroup.activeCount()];
        myThreadGroup.enumerate(activeThreads);
        for (Thread thread : activeThreads) {
            System.out.println("一张图片下载超时 :" + ((picThread) thread).file.getName() + "
" + ((picThread) thread).urlStr);
            errCount++;
            // ((picThread) thread).file.delete();
        }
        return count - myThreadGroup.activeCount();
    }

    // 使用示例:
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<String>();
        list.add(
                "http://imglf1.nosdn.127.net/img/WnhZUEZYSVNPd1lsd1doNjVPSWVkREFwNTRrNTdUM2tQYkk2bHVabHpIYjJOZVFFeEdaUWRnPT0.jpg");
        list.add("http://imgsrc.baidu.com/imgad/pic/item/b58f8c5494eef01f2c2e59feebfe9925bc317dd6.jpg");
        list.add(
                "http://imglf1.nosdn.127.net/img/WnhZUEZYSVNPd1p2Wk54NlRNMTZKLzJnci9HanJsbUNFUTlJdWdFaDhJQUlQQ3h5Y1kzOFlRPT0.jpg");
        list.add("http://b.hiphotos.baidu.com/image/pic/item/7a899e510fb30f247b237cc9c195d143ac4b03ba.jpg");
        System.out.println("完成,成功下载了:" + download(list, "C:\Users\Jim\Desktop\testPic\"));
        System.out.println("失败:" + DownloadFromUrlList3.errCount);
        System.exit(0);
    }

}

class picThread extends Thread {
    public String urlStr = "";
    public File file;
    /*
     * public void setUrl(String url) { urlStr = url; }
     * 
     * public String getUrl() { return urlStr; }
     */

    public picThread(ThreadGroup group, Runnable run) {
        super(group, run);
    }
}