Showing posts with label Tomcat server. Show all posts
Showing posts with label Tomcat server. Show all posts
How to install and configure Apache Tomcat 7
Read the steps here
http://www3.ntu.edu.sg/home/ehchua/programming/howto/tomcat_howto.htm
@webservlet annotation to simplify deployment of servlets
Servlet 3.0, which is supported by Tomcat 7, introduces the @WebServlet annotation, which greatly simplifies the deployment of servlets. You no longer need to write the deployment descriptor in "web.xml". Instead, you can use the @WebServlet annotation to specify the url mapping.
For example, let us write a new servlet called HelloAgainServlet.java, by modifying the HelloServlet.java written earlier, with url mapping of "sayhi".
// To save as "\webapps\hello\WEB-INF\classes\AnotherHelloServlet.java"
import java.io.*;
import javax.servlet.*;
import javax.servlet.annotation.*;
import javax.servlet.http.*;
@WebServlet("/sayhi")
public class AnotherHelloServlet extends HttpServlet {
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
// Set the response MIME type
response.setContentType("text/html;charset=UTF-8");
// Allocate a output writer to write the response message into the network socket
PrintWriter out = response.getWriter();
// Write the response message, in an HTML page
try {
out.println("");
out.println("Hello, World ");
out.println("");
out.println("
Hello world, again!
"); // says Hello // Echo client's request information out.println("Request URI: " + request.getRequestURI() + "
"); out.println("Protocol: " + request.getProtocol() + "
"); out.println("PathInfo: " + request.getPathInfo() + "
"); out.println("Remote Address: " + request.getRemoteAddr() + "
"); // Generate a random number upon each request out.println("A Random Number: " + Math.random() + "
"); out.println(""); } finally { out.close(); // Always close the output writer } } } In Line 7, the annotation @WebServlet("/sayhi") is used to declare the url mapping for this servlet, i.e., http://localhost:9999/hello/sayhi. There is no need to provide any more configuration in "web.xml"!
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