Re: Refreshing problems with Tomcat

Ok, here the code for the servlet that generates HTML:

package simple_chart_view;

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

/**
* Title: 
* Description: 
* Copyright: Copyright (c) 2004
* Company: 
* @author not attributable
* @version 1.0
*/

public class Servlet_SIMPLE_Chart_View
extends HttpServlet {
private static final String CONTENT_TYPE = "text/html";
//Initialize global variables
private StringBuffer pageHtml = new StringBuffer();
private String selectedLang = "";
private String selectedType = "";

public void init() throws ServletException {
pageHtml = new StringBuffer();
selectedLang = "";
selectedType = "";
}

//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws
ServletException, IOException {
doPost(request, response);
}

//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse
response) throws
ServletException, IOException {

selectedLang = request.getParameter("lang");
selectedType = request.getParameter("type");
response.setContentType(CONTENT_TYPE);
constructPage();
PrintWriter out = response.getWriter();
out.println(pageHtml.toString());
out.flush();
out.close();
}

//Clean up resources
public void destroy() {
}

private void constructPage() {
java.util.Random rand = new java.util.Random();
int randInt = rand.nextInt();
pageHtml.append("<HTML>");
pageHtml.append("<HEAD>");
pageHtml.append("<TITLE>SIMPLE Chart</TITLE>");
pageHtml.append("</HEAD>");
pageHtml.append("<BODY>");
pageHtml.append("");
pageHtml.append("Time Series Graph");
pageHtml.append("");
if( selectedType != null ) {
if( selectedType.equalsIgnoreCase("0") ) {
pageHtml.append("<IMG SRC=\"ServletChartGenerator");
}
else if( selectedType.equalsIgnoreCase("1") ) {
pageHtml.append("<IMG SRC=\"ServletChartGenerator1");
}
else if( selectedType.equalsIgnoreCase("2") ) {
pageHtml.append("<IMG SRC=\"ServletChartGenerator2");
}
}
else{
pageHtml.append("<IMG SRC=\"ServletChartGenerator");
}
if( selectedLang != null ) {
if( selectedLang.equalsIgnoreCase("EN") ) {
pageHtml.append("?lang=EN&id=" + randInt + "\"");
}
else if( selectedLang.equalsIgnoreCase("FR") ) {
pageHtml.append("?lang=FR&id=" + randInt + "\"");
}
else if( selectedLang.equalsIgnoreCase("ALL") ) {
pageHtml.append("?lang=ALL&id=" + randInt + "\"");
}
}
else{
pageHtml.append("?lang=ALL&id=" + randInt + "\"");
}
pageHtml.append(" BORDER=1 WIDTH=800 HEIGHT=600/>");
pageHtml.append("</BODY>");
pageHtml.append("</HTML>");
}
}

I hope that will help.

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Re: Refreshing problems with Tomcat

Martin Lew

2004-10-27