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First servlet example
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Servlet is way to replacement of CGI technology. Servlet works on request and response system with http client and server side. Servlet take request and give it to server and server process, request and send back response to http browser or client. Here we have a servlet example.
How to write first servlet, This servlet examples helps to write servlet. Write this servlet code in nodepad of or any editor and save this servlet example with java extension.
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This first servlet java file should be saved in webapps of tomcat in your application context in WEB-INF in classes and compile it, Run javac command in command prompt. Servlet does not contain main method. So servlet can not run on java directly, mean like simple java program, servlet can not execute on command prompt. You can execute servlet on web browser, but servlet class file should be in tomcat web server of WEB-INF/classes folder. When you try compile first servlet example,
classpath of tomcat/lib/servlet-api.jar jar file should be set.
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First Servlet Example
// Java servlet Document
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class first extends HttpServlet
{
public void doGet(HttpServletRequest req,HttpServletResponse res)
throws ServletException,IOException
{
PrintWriter out = res.getWriter();
res.setContentType("text/html");
out.println("this is First servlet Example ");
}
}
first servlet can be executed on web browser with
http://localhost:8080/servlet/first
Another Servlet Example
This servlet uses post method instead of get method. But we need get method also
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;
public class SecondServlet extends HttpServlet {
public void init() throws ServletException
{
///// Can make here database connection
///// This init method once for a servlet
}
public void doPost(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 Second Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print("example");
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws IOException,ServletException {
doPost(request, response);
}
public void destroy() {
////// Close all database connnection here
///// Called when servlet closing
}
}
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