思路

系統中自定義了404，自定義404頁面的mime-type是:text/html;charset=UTF-8,使用HTTP HEAD請求，判斷有沒有Content-Length頭。

如果有Content-Length頭說明是正常的二進位制附件。

import lombok.extern.slf4j.Slf4j;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpHead;
 
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.TrustStrategy;

import javax.net.ssl.HostnameVerifier;
import
 
 javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Collections;
 
import java.util.List;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;


@Slf4j
public class Main {

    static String folder ="";

    public static void main(String[] args) throws IOException{


        Properties prop = System.getProperties();

        String os = prop.getProperty("os.name");
        if (os != null && os.toLowerCase().indexOf("linux") > -1) {
           folder="/home/erdpc/";
        }else
        {
            folder="d:/";
        }

        Main bootstrap = new Main();

        List<String> files = bootstrap.readAttachments();

        ExecutorService executor1 = Executors.newFixedThreadPool(50);


        for (int i = 0; i <files.size(); i++)
        {
            MyTask task = new MyTask(files.get(i).replace("\\","/"));
            executor1.execute(task);
        }



        System.in.read(); //阻塞主執行緒

    }



    static class MyTask implements Runnable {
        private String filename;

        public MyTask(String filename) {
            this.filename = filename;
        }

        @Override
        public void run() {


            try {
                String uri = "https://www.ksst-erdpc.cn/".concat(filename.replaceAll(" ","%20"));
                HttpHead httpHead = new HttpHead(uri);
                //巡檢時更改為信任證書
                CloseableHttpClient httpClient = buildDefaultHttpClientTrustSSL();

                httpHead.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64)spider");
                httpHead.addHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8");
                httpHead.addHeader("Accept-Encoding", "gzip, deflate");
                httpHead.addHeader("Accept-Language", "zh-CN,zh;q=0.9");

                HttpResponse response = httpClient.execute(httpHead);
                Header contentLength = response.getFirstHeader("Content-Length");
                Header contentType = response.getFirstHeader("Content-Type");
                if(contentLength == null&&"text/html;charset=UTF-8".equals(contentType.getValue()))
                {
                    write(filename.replaceAll("%20"," ").concat("\r\n"));
                }
            } catch (IOException e) {
                System.err.printf("檔案檢測出錯:%s,資訊:%s\r\n",filename.replaceAll("%20"," "),e.getMessage());
                write(filename.replaceAll("%20"," ").concat("\r\n").concat(e.getMessage()));
            }
        }

        @Override
        public String toString() {
            return "MyTask [filename=" + filename + "]";
        }
    }


    private static void write(String url)
    {
        try {
            Files.write(Paths.get(folder.concat("error.txt")),url.getBytes(),StandardOpenOption.APPEND);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private List<String> readAttachments() {
        try {
            List<String> files = Files.readAllLines(Paths.get(folder.concat("attachment.txt")));
            System.out.println(files.size());
            return files.stream().map(file->{
                if(file.startsWith("\""))
                {
                    file = file.substring(1);
                }

                if(file.endsWith("\""))
                {
                    file= file.substring(0,file.length()-1);
                }
                return file;
            }).collect(Collectors.toList());
        } catch (IOException e) {
            e.printStackTrace();
        }
        return Collections.emptyList();
    }




    /**
     * 信任SSL證書
     *
     * @return
     */
    public static CloseableHttpClient buildDefaultHttpClientTrustSSL() {
        SSLContext sslContext = null;
        try {
            sslContext = SSLContextBuilder.create().useProtocol(SSLConnectionSocketFactory.SSL).loadTrustMaterial(new TrustStrategy() {
                @Override
                public boolean isTrusted(X509Certificate[] x, String y) throws CertificateException {
                    return true;
                }
            }).build();
        } catch (Exception e) {
            e.printStackTrace();
        }
        RequestConfig config = RequestConfig.custom()
                .setSocketTimeout(30000)
                .setConnectTimeout(30000)
                .setConnectionRequestTimeout(30000)
                .setContentCompressionEnabled(true)
                .build();
        return HttpClientBuilder.create().setDefaultRequestConfig(config).setSSLContext(sslContext).setSSLHostnameVerifier(new HostnameVerifier() {
            @Override
            public boolean verify(String x, SSLSession y) {
                return true;
            }
        }).build();
    }

程式執行結果

下圖是檔案丟失的（部分是黑客掃描資料）

參考來源：

https://stackoverflow.com/questions/4992317/illegal-character-in-path-at-index-16