servlets

swoosh · #1 (**permalink**) 03-15-2007, 06:53 PM

If I already have servlets why would I need to use JSP technology for? What are some main addition of this technology that could make my existing sites more optimized?

ragavraj · #2 (**permalink**) 03-17-2007, 06:26 AM

JavaServer Pages (JSP) technology is the Java platform technology for delivering dynamic content to web clients in a portable, secure and well-defined way. The JavaServer Pages specification extends the Java Servlet API to provide web application developers with a robust framework for creating dynamic web content on the server using HTML, and XML templates, and Java code, which is secure, fast, and independent of server platforms. JSP has been built on top of the Servlet API and utilizes Servlet semantics. JSP has become the preferred request handler and response mechanism. Although JSP technology is going to be a powerful successor to basic Servlets, they have an evolutionary relationship and can be used in a cooperative and complementary manner.

Servlets are powerful and sometimes they are a bit cumbersome when it comes to generating complex HTML. Most servlets contain a little code that handles application logic and a lot more code that handles output formatting. This can make it difficult to separate and reuse portions of the code when a different output format is needed. For these reasons, web application developers turn towards JSP as their preferred servlet environment

Thanks
Ragav

Karpagarajan · #3 (**permalink**) 03-18-2007, 11:13 PM

Thanks Ragav, Can you give a sample program about the servlet object and how it will be used in web applications? It will be better tp give the client source and servlet object with a sample program.

thanks

ragavraj · #4 (**permalink**) 03-20-2007, 08:31 AM

Quote:

Originally Posted by Karpagarajan

Thanks Ragav, Can you give a sample program about the servlet object and how it will be used in web applications? It will be better tp give the client source and servlet object with a sample program.

thanks

Hi

I have written a Sample program in servlets

//#--Server Side Programm example1.java
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Hello extends HttpServlet {

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws IOException, ServletException {

response.setContentType("text/html");

PrintWriter out = response.getWriter();

String param = request.getParameter("param");

if (param != null)
out.println("Thanks for Ur Visit ='" + param + "'!!!!");

}

}

//#-- Client Side
<FORM METHOD="GET" ACTION="http://localhost.8080/cgi-bin/servletrun/example1">
<TR><TD>Name:</TD><TD><INPUT NAME="param" size="50"></TD> </TR>
<TR><TD><input type="submit" name="ClickMe" value="ClickMe"></TD></TR>

</FORM>

above program just print a String what ever u give value in text box

Thanks
Ragav

leoraja8 · #5 (**permalink**) 08-29-2007, 06:36 AM

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

import util.HTMLFilter;

/**
* Example servlet showing request headers
*
*/

public class RequestHeaderExample extends HttpServlet {

ResourceBundle rb = ResourceBundle.getBundle("LocalStrings");

public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
response.setContentType("text/html");

PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<body bgcolor=\"white\">");
out.println("<head>");

String title = rb.getString("requestheader.title");
out.println("<title>" + title + "</title>");
out.println("</head>");
out.println("<body>");

// all links relative

// XXX
// making these absolute till we work out the
// addition of a PathInfo issue

out.println("<a href=\"../reqheaders.html\">");
out.println("<img src=\"../images/code.gif\" height=24 " +
"width=24 align=right border=0 alt=\"view code\"></a>");
out.println("<a href=\"../index.html\">");
out.println("<img src=\"../images/return.gif\" height=24 " +
"width=24 align=right border=0 alt=\"return\"></a>");

out.println("<h3>" + title + "</h3>");
out.println("<table border=0>");
Enumeration e = request.getHeaderNames();
while (e.hasMoreElements()) {
String headerName = (String)e.nextElement();
String headerValue = request.getHeader(headerName);
out.println("<tr><td bgcolor=\"#CCCCCC\">");
out.println(HTMLFilter.filter(headerName));
out.println("</td><td>");
out.println(HTMLFilter.filter(headerValue));
out.println("</td></tr>");
}
out.println("</table>");
}

public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
doGet(request, response);
}

}

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