MyServlet.java Source code

Introduction

Here is the source code for MyServlet.java

Source

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

public class MyServlet extends HttpServlet {

    int count;

    public void init() throws ServletException {
        FileReader fileReader = null;
        BufferedReader bufferedReader = null;
        try {
            fileReader = new FileReader("InitDestroyCounter.initial");
            bufferedReader = new BufferedReader(fileReader);
            String initial = bufferedReader.readLine();
            count = Integer.parseInt(initial);
            bufferedReader.close();
            return;
        } catch (Exception ignored) {
        }

        String initial = getInitParameter("initial");
        try {
            count = Integer.parseInt(initial);
            return;
        } catch (NumberFormatException ignored) {
        } // null or non-integer value
        count = 0;
    }

    public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        res.setContentType("text/plain");
        PrintWriter out = res.getWriter();
        count++;
        out.println("Since the beginning, this servlet has been accessed " + count + " times.");
    }

    public void destroy() {
        super.destroy();
        saveState();
    }

    public void saveState() {
        FileWriter fileWriter = null;
        PrintWriter printWriter = null;
        try {
            fileWriter = new FileWriter("InitDestroyCounter.initial");
            printWriter = new PrintWriter(fileWriter);
            printWriter.println(count);
            printWriter.close();
            return;
        } catch (IOException e) {
        }
    }
}