StudentSSBAccessValve.java

package com.test.tomcat;

import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletException;

import org.apache.catalina.valves.ValveBase;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;

public class StudentSSBAccessValve extends ValveBase {

    private static final String LOG_FILE = "/opt/tomcat/logs/student_ssb_access.log";
    private static final SimpleDateFormat formatter = new SimpleDateFormat("dd/MMM/yyyy:HH:mm:ss Z");

    public StudentSSBAccessValve() {
        super(true);
    }

    @Override
    public void invoke(Request request, Response response) throws IOException, ServletException {
        getNext().invoke(request, response); // Process the request

        String uri = request.getRequestURI();
        if (uri.startsWith("/StudentSelfService/ssb/*")) {
            String logEntry = String.format("%{X-Forwarded-For}i %l %u %t "%r" %s",
                    request.getRemoteAddr(),
                    formatter.format(new Date()),
                    request.getMethod(),
                    uri,
                    request.getProtocol(),
                    response.getStatus(),
                    response.getContentLength());

            try (FileWriter fw = new FileWriter(LOG_FILE, true)) {
                fw.write(logEntry);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}