📄 simplevoteservlet.java
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package org.com.Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.com.JavaBean.Counter;
public class SimpleVoteServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public SimpleVoteServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
String vote = request.getParameter("vote");
if(vote == null)
{
response.sendRedirect("simple_showvote.jsp");
}
else if(vote.equals("A"))
{
Counter counter = new Counter();
int a = Integer.parseInt(counter.readFile(request.getRealPath("a.txt")));
counter.writeFile(request.getRealPath("a.txt"),a+1);
}
else if(vote.equals("B"))
{
Counter counter = new Counter();
int a = Integer.parseInt(counter.readFile(request.getRealPath("b.txt")));
counter.writeFile(request.getRealPath("b.txt"),a+1);
}
else if(vote.equals("C"))
{
Counter counter = new Counter();
int a = Integer.parseInt(counter.readFile(request.getRealPath("c.txt")));
counter.writeFile(request.getRealPath("c.txt"),a+1);
}
response.sendRedirect("simple_showvote.jsp");
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
}
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