Servlet First Program
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Servlet First Program
Servlet programming is very simple but you need some basic knowledge for example interface, abstract class, exception handling.
Steps to write servlet program
- Define web directory structure
- Define .jsp/.html pages
- Define servlet program, compile into classes folder
- Define web.xml, into WEB-INF folder
- Deploy the webroot into web server deployment folder location.
- Start the server
- Open web browser and invoke servlet/.html/.jsp.
Write a web applicaton to send hello word as response to client using servlet.
FirstServlet.java
import java.io.*;
import javax.servlet.*;
public class FirstServlet extends HttpServlet {
public void service(HttpServletRequest request, HttpServletResponse response)throws IOException, ServletException
{
// get request parameter
// business operation
String resultvalue="<body bgcolor="cyan" text="red"> <h1> hello word</h1></body>";
// prepare response
resp.setContentType("text/html");
printWriter out=resp.getWriter();
// send response
out.print(resultvalue);
out.close();
}
}
web.xml
<web-app>
<servlet>
<servlet-name>s1</servlet-name>
<servlet-class>FirstServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>s1</servlet-name>
<url-pattern>/servlet1</url-pattern>
</servlet-mapping>
</web-app>
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FirstServlet.java
import java.io.*;
import javax.servlet.*;
public class FirstServlet extends HttpServlet {
public void service(HttpServletRequest request, HttpServletResponse response)throws IOException, ServletException
{
// get request parameter
// business operation
String resultvalue="<body bgcolor="cyan" text="red"> <h1> hello word</h1></body>";
// prepare response
resp.setContentType("text/html");
printWriter out=resp.getWriter();
// send response
out.print(resultvalue);
out.close();
}
}
web.xml
<web-app> <servlet> <servlet-name>s1</servlet-name> <servlet-class>FirstServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>s1</servlet-name> <url-pattern>/servlet1</url-pattern> </servlet-mapping> </web-app>
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