/* *

 *@Description:

 *@Author:TYJ

 *@Date: create in  2020/4/22 18:18

 */

import javax.net.ssl.*;

import java.security.cert.CertificateException;

import java.security.cert.X509Certificate;

public class SslUtils {

    private static void trustAllHttpsCertificates() throws Exception {

        TrustManager[] trustAllCerts = new TrustManager[1];

        TrustManager tm = new miTM();

        trustAllCerts[0] = tm;

        SSLContext sc = SSLContext.getInstance("SSL");

        sc.init(null, trustAllCerts, null);

        HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());

    }

    static class miTM implements TrustManager,X509TrustManager {

        public X509Certificate[] getAcceptedIssuers() {

            return null;

        }

        public boolean isServerTrusted(X509Certificate[] certs) {

            return true;

        }

        public boolean isClientTrusted(X509Certificate[] certs) {

            return true;

        }

        public void checkServerTrusted(X509Certificate[] certs, String authType)

                throws CertificateException {

            return;

        }

        public void checkClientTrusted(X509Certificate[] certs, String authType)

                throws CertificateException {

            return;

        }

    }

    /**

     * 忽略HTTPS请求的SSL证书，必须在openConnection之前调用

     * @throws Exception

     */

    public static void ignoreSsl() throws Exception{

        HostnameVerifier hv = new HostnameVerifier() {//实现自己的脚丫逻辑，这里就直接返回true，不进行校验

            public boolean verify(String urlHostName, SSLSession session) {

                System.out.println("Warning: URL Host: " + urlHostName + " vs. " + session.getPeerHost());

                return true;

            }

        };

        trustAllHttpsCertificates();

        HttpsURLConnection.setDefaultHostnameVerifier(hv);

    }

}

import org.jsoup.Jsoup;

import org.jsoup.nodes.Document;

import java.io.*;

import java.net.*;

import java.util.ArrayList;

import java.util.List;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class WallpaperDownload {

    private static final String BY_PREFIX = "https://bing.ioliu.cn";

    public static void main(String[] args) {

        // 运行时指定一个本地下载路径

        String path = "";

        for(int i=0; i<args.length; i++){

            path = args[i];

        }

        if(path == null || path.length()==0){

            path = "C:\\Users\\HP\\Pictures\\bing";

        }

        File filePath = new File(path);

        if(!filePath.exists()){

            System.out.println("创建目录：" + filePath.getName());

            filePath.mkdirs();

        }

        System.out.println("下载位置：" + filePath.getName());

        download(path);

    }

    public static void download(String path) {

        long start = System.currentTimeMillis();

        String pageHtml = "https://bing.ioliu.cn/ranking";

        for (int i = 1; i <= 105; i++) {

            if (i > 1) {

                pageHtml = pageHtml + "?p=" + i;

            }

            try {

                String[] links = getAddress(pageHtml);

                execute(links, path);

            } catch (IOException e) {

                e.printStackTrace();

            }

            pageHtml = "https://bing.ioliu.cn/ranking";

        }

        long end = System.currentTimeMillis();

        long time = (end - start) / 1000;

        System.out.println("下载耗时：" + time);

    }

    /**

     * 下载图片

     *

     * @param links

     * @param path  下载位置

     * @throws

     */

    public static void execute(String[] links, String path) throws IOException {

        if (!path.endsWith("\\")) {

            path = path + "\\";

        }

        for (int i = 0; i < links.length; i++) {

            HttpURLConnection urlConnection = getConnection(links[i]);

            InputStream ins = urlConnection.getInputStream();

            String imageName = links[i].substring(links[i].lastIndexOf("/") + 1).split("\\?")[0];

            File file = new File(path + imageName + ".jpg");

            OutputStream outputStream = null;

            if (!file.exists()) {

                outputStream = new FileOutputStream(file);

                int readCount;

                byte[] bytes = new byte[10240];

                while ((readCount = ins.read(bytes)) != -1) {

                    outputStream.write(bytes, 0, readCount);

                }

                System.out.println("[" + imageName + "] download finished ...");

            } else {

                System.out.println(file.getName() + " existed ...");

            }

        }

    }

    /**

     * 获取下载链接地址

     *

     * @return

     * @throws IOException

     */

    public static String[] getAddress(String htmlPage) throws IOException {

        System.out.println("get [" + htmlPage + "] info ...");

        HttpURLConnection connection = getConnection(htmlPage);

        InputStream is = connection.getInputStream();

        String newLine = System.getProperty("line.separator");

        BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));

        StringBuilder result = new StringBuilder();

        String line;

        String html;

        while ((line = reader.readLine()) != null) {

            result.append(line + newLine);

        }

        html = result.toString();

        Document doc = Jsoup.parseBodyFragment(html);

        html = doc.body().html();

        String[] links = extractLinks(html);

        return links;

    }

    /**

     * 提取图片链接

     *

     * @param html

     */

    static String[] extractLinks(String html) {

        List<String> list = new ArrayList<>();

        String pattern = "/photo/.*_.*\\?force=download";

        Pattern r = Pattern.compile(pattern);

        Matcher m = r.matcher(html);

        while (m.find()) {

            String group = m.group();

            String[] split = group.split("&");

            list.add(split[0]+"?force=download");

        }

        String[] results = new String[list.size()];

        for (int i = 0; i < list.size(); i++) {

            results[i] = BY_PREFIX + list.get(i);

        }

        return results;

    }

    /**

     * 获取连接

     *

     * @param urlStr

     * @return

     */

    public static HttpURLConnection getConnection(String urlStr) {

        HttpURLConnection urlConnection = null;

        try {

            URI uri = new URI(urlStr);

            URL url = uri.toURL();

            try {

                //自己伪造ssl证书

                SslUtils.ignoreSsl();

            } catch (Exception e) {

                e.printStackTrace();

            }

            urlConnection = (HttpURLConnection) url.openConnection();

            //防止403

            //Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.67 Safari/537.36 Edg/87.0.664.55

            urlConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.67 Safari/537.36 Edg/87.0.664.55");

        } catch (URISyntaxException e) {

            e.printStackTrace();

        } catch (MalformedURLException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

        return urlConnection;

    }

}