AntiXXN.java

X.java

import javax.net.ssl.SSLParameters;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;
import java.util.Date;
import java.util.concurrent.atomic.AtomicLong;

public class X {
    public static void main(String[] args) {
        for (int i = 0; i < Runtime.getRuntime().availableProcessors() * 2; ++i) {
            final int fi = i;
            Thread t = new Thread(() -> run(fi));
            t.start();
        }
    }

    private static final AtomicLong count = new AtomicLong(0);

    public static void run(int threadIndex) {
        var sslParams = new SSLParameters();
        sslParams.setApplicationProtocols(new String[]{"http/1.1"});
        var client = HttpClient.newBuilder()
            .connectTimeout(Duration.ofMillis(2000))
            .version(HttpClient.Version.HTTP_1_1)
            .sslParameters(sslParams)
            .followRedirects(HttpClient.Redirect.ALWAYS)
            .build();

        var ua = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.0.0 Safari/537.36";
        var req1 = HttpRequest
            .newBuilder(URI.create("https://cs.xidian.edu.cn/info/1003/14561.htm"))
            .header("User-Agent", ua)
            .build();
        var req2 = HttpRequest
            .newBuilder(URI.create("https://cs.xidian.edu.cn/system/resource/code/datainput.jsp?owner=1609340945&e=1&w=1920&h=1200&treeid=1003&refer=&pagename=L0NvbnRlbnQuanNw&newsid=14561"))
            .header("User-Agent", ua)
            .build();
        var req3 = HttpRequest
            .newBuilder(URI.create("https://cs.xidian.edu.cn/system/resource/code/news/click/dynclicks.jsp?clickid=14561&owner=1609340945&clicktype=wbnews"))
            .header("User-Agent", ua)
            .build();

        System.out.println("thread[" + threadIndex + "]: started");

        //noinspection InfiniteLoopStatement
        while (true) {
            try {
                client.send(req1, HttpResponse.BodyHandlers.discarding());
            } catch (Throwable t) {
                System.err.println("thread[" + threadIndex + "]: failed sending req1: " + t);
            }
            try {
                client.send(req2, HttpResponse.BodyHandlers.discarding());
            } catch (Throwable t) {
                System.err.println("thread[" + threadIndex + "]: failed sending req2: " + t);
            }
            HttpResponse<String> resp;
            try {
                resp = client.send(req3, HttpResponse.BodyHandlers.ofString());
            } catch (Throwable t) {
                System.err.println("thread[" + threadIndex + "]: failed sending req3: " + t);
                continue;
            }
            if (resp.statusCode() == 200) {
                long count;
                try {
                    count = Long.parseLong(resp.body().trim());
                } catch (NumberFormatException e) {
                    System.err.println("thread[" + threadIndex + "]: req3 returns invalid response: " + resp.body());
                    count = -1;
                }
                if (count != -1) {
                    long old = X.count.get();
                    if (count / 1_000 > old / 1_000) {
                        synchronized (X.count) {
                            old = X.count.get();
                            if (count / 1_000 > old / 1_000) {
                                var now = new Date();
                                System.out.println("thread[" + threadIndex + "]: " + now + " - " + resp.body().trim());
                                X.count.set(count);
                            }
                        }
                    }
                }
            } else {
                System.err.println("thread[" + threadIndex + "]: failed sending req3: " + resp.statusCode() + ": " + resp.body());
            }
            try {
                //noinspection BusyWait
                Thread.sleep(200);
            } catch (InterruptedException ignore) {
            }
        }
    }
}