Java Reference
In-Depth Information
15.private static final long serialVersionUID = 1L;
16.
17. /**
18. * @see HttpServlet#HttpServlet()
19. */
20. public HelloWorld() {
21. super();
22. // TODO Auto-generated constructor stub
23. }
24.
25./**
26. * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
27. */
28.protected void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
29.// TODO Auto-generated method stub
30.}
31.
32./**
33. * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
34. */
35.protected void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
36.// TODO Auto-generated method stub
37.}
38.
39.}
Line 13
: This line shows the usage of the
@WebServlet
annotation. The
HelloWorld
servlet is decorated with the
@WebServlet
annotation to specify
the name, URL pattern, initialization parameters, and other configuration items
usually specified in the
web.xml
deployment descriptor.
Line 14
: This line shows that the
HelloWorld
servlet extends the
HTTPServlet
.
Lines 28 to 37
: These lines show the
doGet
and
doPost
methods generated by
the IDE.
Add the code in Listing 2-13 to the
doGet
method of the
HelloWorld
servlet.
Listing 2-13. Printing “Hello World”
PrintWriter out = response.getWriter();
out.println("<h2>Hello World !</h2>");
You will have to import
java.io.Printwriter
. You can do this in Eclipse by selecting Source
➤
Add Import or by pressing Ctrl+Shift+M; now you can run the application on the server. Right-click
HelloWorld.java
in the helloworld project in Eclipse and then select Run As
➤ Run on Server. The
server you are using in this case is Tomcat 7.0. Then use the following URL to access the application:
