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java 抓取网页图片

2024-07-02 02:20:30   230人阅读

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import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/***
 * java抓取网络图片
 *
 * @author swinglife
 *
 */
public class CatchImage
{
 
    // 地址
    private static final String URL = "http://www.4493.com/";
    // 编码
    private static final String ECODING = "UTF-8";
    // 获取img标签正则
    private static final String IMGURL_REG = "<img.*src=http://www.mamicode.com/(.*?)[^>]*?>";
    // 获取src路径的正则
    private static final String IMGSRC_REG = "http:\"?(.*?)(\"|>|\\s+)";
 
    private static final String IMGDSRC_REG = "[\"\‘](http.+\\.(jpg|JPG|png|PNG|gif|GIF))[\"\‘]";
    private static final String[] picstuffix = { "jpg", "JPG", "gif", "GIF", "png", "PNG" };
 
    private static List<String> pList = new ArrayList<>();
 
    public static void main(String[] args) throws Exception
    {
        CatchImage cm = new CatchImage();
        // 获得html文本内容
        String HTML = cm.getHTML(URL);
        // System.out.println(HTML);
        // 获取图片标签
        List<String> imgUrl = cm.getImageUrl(HTML);
         // 获取图片src地址
         List<String> imgSrc = http://www.mamicode.com/cm.getImageSrc(imgUrl);
         // 下载图片
         cm.Download(imgSrc, "E:\\Imagesave"+saveDiff());
         
//      cm.getImageSrc(HTML);
        // cm.ThreadDownload(imgSrc, "E:\\Imagesave"+saveDiff() , 6);
//      cm.TOThreadDownload(pList, "E:\\Imagesave" + saveDiff(), 6, 6000);
    }
 
    /***
     * 获取HTML内容
     *
     * @param url
     * @return
     * @throws Exception
     */
    private String getHTML(String url) throws Exception
    {
        URL uri = new URL(url);
        URLConnection connection = uri.openConnection();
        InputStream in = connection.getInputStream();
        byte[] buf = new byte[1024];
        int length = 0;
        StringBuffer sb = new StringBuffer();
        while ((length = in.read(buf, 0, buf.length)) > 0)
        {
            sb.append(new String(buf, ECODING));
        }
        in.close();
        return sb.toString();
    }
 
    /***
     * 获取ImageUrl地址
     *
     * @param HTML
     * @return
     */
    private List<String> getImageUrl(String HTML)
    {
        Matcher matcher = Pattern.compile(IMGURL_REG).matcher(HTML);
        List<String> listImgUrl = new ArrayList<String>();
        while (matcher.find())
        {
            listImgUrl.add(matcher.group());
        }
        return listImgUrl;
    }
 
    /***
     * 获取ImageSrc地址
     *
     * @param listImageUrl
     * @return
     */
    private List<String> getImageSrc(List<String> listImageUrl)
    {
        List<String> listImgSrc = http://www.mamicode.com/new ArrayList<String>();
        for (String image : listImageUrl)
        {
            Matcher matcher = Pattern.compile(IMGSRC_REG).matcher(image);
            while (matcher.find())
            {
                listImgSrc.add(matcher.group().substring(0, matcher.group().length() - 1));
            }
        }
        return listImgSrc;
    }
 
    /**
     * 获取html里面的图片
     *
     * @param html
     * @return
     */
    private void getImageSrc(String html)
    {
        Pattern p = Pattern.compile(IMGDSRC_REG);
        Matcher m = p.matcher(html);
        while (m.find())
        {
            getpicsrc(m.group(1));
        }
    }
 
    /**
     * 截取字符串里面的图片
     *
     * @param src
     * @return
     */
    public void getpicsrc(String src)
    {
        if (src.contains("http:"))
        {
            String[] app = src.split("http:");
            for (int i = 0; i < app.length; i++)
            {
                if (!isBlank(app[i]))
                {
                    for (int j = 0; j < picstuffix.length; j++)
                    {
                        if (app[i].contains("." + picstuffix[j]))
                        {
                            int inum = app[i].indexOf(picstuffix[j]);
                            String url = "http:" + app[i].substring(0, inum) + picstuffix[j];
                            pList.add(url);
                        }
                    }
                }
            }
        }
    }
 
    /**
     * 去处重复元素
     *
     * @param result
     * @return
     */
    public static List<String> RemoveRepeated(List<String> result)
    {
        List<String> tmpArr = new ArrayList<String>();
        for (int i = 0; i < result.size(); i++)
        {
            if (!tmpArr.contains(result.get(i)))
            {
                tmpArr.add((String) result.get(i));
            }
        }
        return tmpArr;
    }
 
    /**
     * 判断非空
     *
     * @param cs
     * @return
     */
    public static boolean isBlank(CharSequence cs)
    {
        int strLen;
        if (cs == null || (strLen = cs.length()) == 0)
        {
            return true;
        }
        for (int i = 0; i < strLen; i++)
        {
            if (Character.isWhitespace(cs.charAt(i)) == false)
            {
                return false;
            }
        }
        return true;
    }
 
    /***
     * 单线程下载图片
     *
     * @param listImgSrc
     */
    private void Download(List<String> listImgSrc, String savedir)
    {
        for (String url : listImgSrc)
        {
            try
            {
                String imageName = url.substring(url.lastIndexOf("/") + 1, url.length());
                URL uri = new URL(url);
                InputStream in = uri.openStream();
                FileOutputStream fo = new FileOutputStream(new File(savedir + imageName));
                byte[] buf = new byte[1024];
                int length = 0;
                while ((length = in.read(buf, 0, buf.length)) != -1)
                {
                    fo.write(buf, 0, length);
                }
                in.close();
                fo.close();
                System.out.println("*^_^*");
            } catch (Exception e)
            {
                System.out.println("-_-!");
            }
        }
    }
 
    /**
     * 多线程下载图片
     *
     * @param listImgSrc
     * @param savedir
     * @param tnum
     */
    private void ThreadDownload(List<String> listImgSrc, String savedir, int tnum)
    {
        for (int i = 0; i < listImgSrc.size(); i += tnum)
        {
            new DThread(savedir, tnum, listImgSrc, i).start();
        }
    }
 
    /**
     *
     * 2014-4-3上午10:52:38 Describe: 多线程下载照片
     *
     * @author: ITWANG
     */
    class DThread extends Thread
    {
 
        private String savedir = null;
        private int tnum;
        private List<String> listImgSrc;
        private int bunm;
 
        public DThread(String savedir, int tnum, List<String> listImgSrc, int bnum)
        {
            this.savedir = savedir;
            this.tnum = tnum;
            this.listImgSrc = http://www.mamicode.com/listImgSrc;
            this.bunm = bnum;
        }
 
        @Override
        public void run()
        {
            for (int i = 0; i < tnum; i++)
            {
                try
                {
                    String url = listImgSrc.get(bunm + i);
                    String sps = url.substring(url.lastIndexOf("."), url.length());
                    String imageName = UUID.randomUUID().toString() + sps;
                    URL uri = new URL(url);
                    InputStream in = uri.openStream();
                    System.out.println(savedir + imageName);
                    FileOutputStream fo = new FileOutputStream(new File(savedir + imageName));
                    byte[] buf = new byte[1024];
                    int length = 0;
                    while ((length = in.read(buf, 0, buf.length)) != -1)
                    {
                        fo.write(buf, 0, length);
                    }
                    in.close();
                    fo.close();
                    System.out.println("*^_^*");
                } catch (Exception e)
                {
                    System.out.println("-_-!");
                }
            }
        }
    }
 
    /**
     * 多线程超时下载
     *
     * @param listImgSrc
     * @param savedir
     * @param tnum
     * @param timeout
     */
    private void TOThreadDownload(List<String> listImgSrc, String savedir, int tnum, int timeout)
    {
        for (int i = 0; i < listImgSrc.size(); i += tnum)
        {
            new TODThread(savedir, tnum, listImgSrc, i, timeout).start();
        }
    }
 
    /**
     *
     * 2014-4-3上午10:52:07 Describe: 超时方式下载照片线程
     *
     * @author: ITWANG
     */
    class TODThread extends Thread
    {
        private String savedir = null;
        private int tnum;
        private List<String> listImgSrc;
        private int bunm;
        private int timeout = 3000;
 
        public TODThread(String savedir, int tnum, List<String> listImgSrc, int bnum, int timeout)
        {
            this.savedir = savedir;
            this.tnum = tnum;
            this.listImgSrc = http://www.mamicode.com/listImgSrc;
            this.bunm = bnum;
            this.timeout = timeout;
        }
 
        @Override
        public void run()
        {
            for (int i = 0; i < tnum; i++)
            {
                String url = listImgSrc.get(bunm + i);
                String sps = url.substring(url.lastIndexOf("."), url.length());
                String imageName = UUID.randomUUID().toString() + sps;
                try
                {
                    if (getPic(url, savedir, imageName, timeout))
                    {
                        System.out.println("*^_^*");
                    } else
                    {
                        System.out.println("-_-!");
                    }
                } catch (Exception e)
                {
                    System.out.println("下载异常");
                }
            }
 
        }
    }
 
    /**
     * GET方式下载照片
     *
     * @param purl
     * @param folder
     * @param filename
     * @param timeout
     * @return
     * @throws Exception
     */
    public boolean getPic(String purl, String folder, String filename, int timeout) throws Exception
    {
        URL url = new URL(purl);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(timeout);
        conn.setRequestMethod("GET");
        conn.setDoOutput(true);
        conn.setDoInput(true);
        if (conn.getResponseCode() == 200)
        {
            InputStream is = conn.getInputStream();
            byte[] bs = new byte[1024];
            int len;
            File sf = new File(folder);
            if (!sf.exists())
            {
                sf.mkdirs();
            }
            OutputStream os = new FileOutputStream(sf.getPath() + "\\" + filename);
            while ((len = is.read(bs)) != -1)
            {
                os.write(bs, 0, len);
            }
            os.close();
            is.close();
            return true;
        }
        return false;
    }
 
    /**
     * 时间文件夹
     *
     * @return
     */
    public static String saveDiff()
    {
        SimpleDateFormat formate = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
        return "\\" + formate.format(System.currentTimeMillis()) + "\\";
    }
 
}

　　


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