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Thursday, April 18, 2013

Tomcat Hello World Servlet

Here's a no-IDE quick-start how-to. Create the following directories:

c:\users\John Smith\Documents\scratch\helloTomcat\src
c:\users\John Smith\Documents\scratch\helloTomcat\dist\WEB-INF

open NotePad++ and create the following two files.

c:\users\John Smith\Documents\scratch\helloTomcat\dist\WEB-INF\web.xml

  '-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN'

c:\users\John Smith\Documents\scratch\helloTomcat\src\

import javax.servlet.http.*;
import javax.servlet.*;

public class HelloServlet extends HttpServlet {
  public void doGet (HttpServletRequest req,
                                         HttpServletResponse res)
        throws ServletException, IOException
        PrintWriter out = res.getWriter();
        out.println("Hello, You!");
Open a command prompt
C:\Users\John Smith\Documents\scratch\helloTomcat\src>javac -cp "C:\Program Files\Apache Software Foundation\Tomcat 7.0\lib\servlet-api.jar"
C:\Users\John Smith\Documents\scratch\helloTomcat\src>mkdir ..\dist\WEB-INF\classes
C:\Users\John Smith\Documents\scratch\helloTomcat\src>copy *.class ..\dist\WEB-INF\classes
C:\Users\John Smith\Documents\scratch\helloTomcat\src>cd ..\dist
C:\Users\John Smith\Documents\scratch\helloTomcat\dist>jar cvf web-arc-test.war
Open a command prompt as Administrator
C:\Users\John Smith\Documents\scratch\helloTomcat\dist>copy web-arc-test.war "C
:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps"
open browser and browse to http://localhost:8085/web-arc-test/mihello
Note: change port to whatever tomcat is running on.