a

src/SSLCertChecker.java

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+import javax.net.ssl.HttpsURLConnection;
+import javax.net.ssl.SSLPeerUnverifiedException;
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.security.cert.Certificate;
+import java.security.cert.X509Certificate;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+public class SSLCertChecker {
+    public static boolean isValidHttpsUrl(String urlString) {
+        try {
+            URL url = new URL(urlString);
+            return "https".equalsIgnoreCase(url.getProtocol());
+        } catch (MalformedURLException e) {
+            return false;
+        }
+    }
+    public static void readUrls(String file) {
+        try(BufferedReader br = new BufferedReader(new FileReader(file))){
+            String urls;
+            while ((urls = br.readLine()) != null){
+                if(isValidHttpsUrl(urls)) {
+                    System.out.println(urls);
+                    checkCert(urls);
+                }
+                else
+                    System.out.println(urls+" is not valid");
+            }
+        }
+        catch (IOException e){
+            System.out.println("Error reading file");
+        }
+    }
+    public static void checkCert(String curl){
+        try {
+            URL url = new URL(curl);
+            HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
+            connection.connect();
+
+            Certificate[] certs = connection.getServerCertificates();
+            for (Certificate cert : certs) {
+                if (cert instanceof X509Certificate) {
+                    X509Certificate x509Cert = (X509Certificate) cert;
+                    Date expiryDate = x509Cert.getNotAfter();
+                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+                    System.out.println("Zertifikatsablaufdatum: " + sdf.format(expiryDate));
+
+                    // Überprüfen, ob das Zertifikat abgelaufen ist
+                    if (expiryDate.before(new Date())) {
+                        System.out.println("WARNUNG: Das SSL-Zertifikat ist abgelaufen!");
+                    } else {
+                        System.out.println("Das SSL-Zertifikat ist gültig.");
+                    }
+                }
+            }
+            connection.disconnect();
+        } catch (SSLPeerUnverifiedException e) {
+            System.out.println("SSL-Fehler: Zertifikat kann nicht verifiziert werden.");
+        } catch (Exception e) {
+            System.out.println("Fehler beim Abrufen des Zertifikats: " + e.getMessage());
+        }
+    }
+    public static void main(String[] args){
+        if(args.length <1)
+            System.out.println("Kein Url-File angegeben");
+        readUrls(args[0]);
+
+    }
+}

src/urls.txt

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+https://edv.zsi-tec.com
+https://ticket.edv.zsi-tec.com
+https://mail.zsi-tec.com