web servlet - J2EE

/*
     Web Servlet - J2EE

*/

package tedoweb1;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
//
/**
 * Servlet implementation class Fajna
 */
/*@WebServlet("/Hello1.do")*/
public class Fajna extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException
    {
        //ciekawe(request, response);
        ciekawe2(request, response);
        //ciekawe3(request, response);
    }

    /**
     * @see HttpServlet#HttpServlet()
     */
    public Fajna() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        //response.getWriter().append("Served at: ").append(request.getContextPath());
        processRequest(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        //doGet(request, response);
        processRequest(request, response);
    }

    //przyklad uzycia forward do pliku pokaz.jsp
        void ciekawe3(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException{
            response.setContentType("text/html;charset=UTF-8");
            PrintWriter out = response.getWriter();
            /*HttpSession ssn = request.getSession();


            if(ssn != null){
                out.println("Your session Id is : ");
                String ssnId = ssn.getId();
                out.println(ssnId);

            }*/

            try{
                request.setAttribute("MD5", dane());
                request.getRequestDispatcher("/pokaz.jsp").forward(request, response);
            }finally{
                out.close();
            }
        }
    private String dane(){
        return "10984938";
    }

    //przyklad uzycia sesji
    void ciekawe2(HttpServletRequest request, HttpServletResponse response) throws IOException{
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        HttpSession ssn = request.getSession();

        Integer visitCount = new Integer(0);
        String visitCountKey = new String("visitCount");
        String userIDKey = new String("userID");
        String userID = new String("ABCD");

        // Check if this is new comer on your web page.
         /* if (ssn.isNew()){
             out.println("Witaj po raz pierwszy na stronie");
              //ssn.setAttribute(userIDKey, userID);
          } else {
             visitCount = (Integer)ssn.getAttribute(visitCountKey);
             visitCount = visitCount + 1;
             out.println("licznik wizyt: " + visitCount);
           }
          ssn.setAttribute(visitCountKey,  visitCount);*/
        if(ssn != null){
            out.println("Your session Id is : ");
            String ssnId = ssn.getId();
            out.println(ssnId);

        }

        try{
            /*if (ssn.isNew()){
             out.println("Witaj po raz pierwszy na stronie");
              ssn.setAttribute(userIDKey, userID);
          } else {
             visitCount = (Integer)ssn.getAttribute(visitCountKey);
             visitCount = visitCount + 1;
             userID = (String)ssn.getAttribute(userIDKey);

           }
          ssn.setAttribute(visitCountKey,  visitCount);
          out.println("licznik wizyt: " + visitCount);*/

            /*if (request.getSession()==null)
            {
                out.println("Witaj na stronie pierwszy raz");
                request.getSession();
            }else
                out.println("Witaj na stronie kolejny raz");*/

            out.println("Autorem skryptu jest " + this.getInitParameter("Autor"));
        }finally{
            out.close();
        }
    }


    void ciekawe(HttpServletRequest request, HttpServletResponse response) throws IOException{
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try{
            String login = request.getParameter("imie");
            //wyslij kod bledu
            //response.sendError(404, "numer telefonu");
            //redirect to another web site
            //response.sendRedirect("http://www.tedo-tech.co.uk");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet Wita </title>");
            out.println("</head>");
            out.println("<body");


            //out.println(request.getContextPath());
            out.println(request.getServletPath());
            //out.println(request.getQueryString());
            /*Cookie[] cookies1 = request.getCookies();
            if(cookies1!=null)
            for (int i = 0; i < cookies1.length; i++) {
             cookies1[i].setMaxAge(0);
            }*/
            //usuwanie Cookie
            /*Cookie cookie = new Cookie("color", "");

            cookie.setMaxAge(0);

            response.addCookie(cookie);*/

            boolean foundCookie = false;
            Cookie[] cookies = request.getCookies();


            for(int i = 0; i < cookies.length; i++) {
                Cookie cookie1 = cookies[i];
                if (cookie1.getName().equals("color")) {
                    out.println("bgcolor = " + cookie1.getValue());
                    foundCookie = true;
                }
            }

            if (!foundCookie) {
                Cookie cookie1 = new Cookie("color", "yellow");
                cookie1.setMaxAge(24*60*60);
                response.addCookie(cookie1);
            }

            out.println(">");
            out.println("<H1>Setting and Reading Cookies</H1>");
            out.println("This page will set its background color using a cookie when reloaded.");
            out.println("<h1>Witaj " + login + ", na tym swiecie!</h1>");
            out.println("</BODY>");
            out.println("</HTML>");

        }finally{
            out.close();
        }

    }

}
/*
*   Maven POM
*
*/
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>tedoweb1</groupId>
  <artifactId>tedoweb1</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.6</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
          <failOnMissingWebXml>false</failOnMissingWebXml>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.3</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
  </build>

  <dependencies>
        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm-all</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-bundle</artifactId>
            <version>1.14</version>
        </dependency>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20090211</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>

    </dependencies>
</project>

/*
 some jsp file
*/

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="Hello1.do">
    <p> wprowadz imie:</p>
    <input type="text" name="imie" />
    <input type="submit" name="OK" />
</form>
</body>
</html>