Brittle Things: Appache

Servlet program for change background color

Change background color using servlet

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

public class ColorServlet extends HttpServlet
{
    public void doGet(HttpServletRequest req,HttpServletResponse res)throws IOException,ServletException
    {
        res.setContentType("Text/Html");
        String c=req.getParameter("color");
        PrintWriter pw=res.getWriter();
        if(c.equals("red"))
            pw.println("<body BGCOLOR=red>");
        if(c.equals("green"))
            pw.println("<body BGCOLOR=green>");
        if(c.equals("green"))
            pw.println("<body BGCOLOR=green>");

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Login page using JSP

JSP simple log in page

jsp code that implement the business logic

<HTML>
    <HEAD>
        <TITLE>
            Welcome..
        </TITLE>
        <%@page language="java" contentType="text/html"%>
    </HEAD>
    <BODY><center><h2>
        <% if((request.getParameter("name").equals("sscollege"))&&(request.getParameter("pass").equals("college")))
            {
                out.println("Login successfully...");
             }
            else
            {
                out.println("Invalid username or password");
             }
        %>
        </h2>

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JSP custom tag with body

Custom tag JSP

Steps for creating custom tag get from here

code for creating jsp custom tag with body

Tag implementation

TagBody.java

package st;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.io.*;

public class TagBody extends TagSupport
{

     public int doStartTag() throws JspException
     {
        try{
               JspWriter out = pageContext.getOut();
               out.println( "<table border=1>");

                      out.println("<tr><td> ");


            }
        catch(Exception ex)
        {
        }
        return EVAL_BODY_INCLUDE;
     }

    public int doEndTag() throws JspException

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Custom tag using JSP without body

JSP custom tag without body

steps

first create a folder named as st in WEB-INF\classes directory

Then create java file named as HellTag.java inside st

paste the following on HellTag.java file

package st;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.io.*;

public class HellTag extends TagSupport
{
    public int doStartTag()
    {
        try{
            JspWriter js=pageContext.getOut();
            js.print("Hello");
        }
        catch(Exception ex)
        {
            System.out.println(ex.getMessage());
        }
        return SKIP_BODY;
    }
}

compile the HelloTag.java file by following manner
javac HellTag.java -classpath "C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib\jsp-api.jar"

Then create st.tld file inside the WEB-INF directory

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Brittle Things

Pages

Thursday, 6 December 2012

Servlet program for change background color

Change background color using servlet

Login page using JSP

JSP simple log in page

jsp code that implement the business logic

JSP custom tag with body

Custom tag JSP

Tag implementation

Custom tag using JSP without body

JSP custom tag without body

steps