11.4. Creating a Servlet
Problem
You want to use Eclipse to develop servlets.
Solution
Develop the servlet’s Java code using Eclipse, and
add servlet.jar or
servlet-api.jar (depending on your version of
Tomcat) as external .jar files. After compiling
the servlet, copy it over to your Tomcat installation.
Discussion
JSP files such as that developed in the previous recipe were introduced to make online Java programming easier. JSPs actually are compiled into servlet code, which is pure Java code, with no HTML mixed in. Developing servlets in Eclipse is like developing other Java code: Eclipse can detect problems even before you compile.
You can see the Java code for a servlet in Example 11-2. Servlet code such as this extends the
HttpServlet class, and you have to include a
.jar file in the build path to get that support.
In Tomcat 4.x, that .jar file is
servlet.jar; in Tomcat 5.x,
it’s servlet-api.jar.
Example 11-2. A sample servlet
package org.cookbook.ch11; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class ServletClass extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { response.setContentType("text/html"); PrintWriter out = response.getWriter( ); out.println("<HTML>"); out.println("<HEAD>"); out.println("<TITLE>"); out.println("Servlet Sample"); out.println("</TITLE>"); out.println("</HEAD>"); out.println("<BODY>"); out.println("<H1>"); out.println("Servlet Sample"); ...Get Eclipse Cookbook now with the O’Reilly learning platform.
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