example.cmp.find
Class FindServlet

java.lang.Object
  |
  +--javax.servlet.GenericServlet
        |
        +--javax.servlet.http.HttpServlet
              |
              +--example.cmp.find.FindServlet

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class FindServlet

extends javax.servlet.http.HttpServlet

A client to illustrate Course bean's finder methods. The example uses three finder methods from the CourseHome interface:

• findByPrimaryKey - the standard find method available in every bean.
• findAll - a collection finder returning all the courses.
• findByInstructor - a single-bean finder returning the course taught by an instructor.

See Also:

Serialized Form

Field Summary

private CourseHome

home The course local home interface.

Fields inherited from class javax.servlet.GenericServlet

config

Constructor Summary

FindServlet()

Method Summary

void	init() Finds the course's home interface using JNDI.
void	service(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doGet, doHead, doOptions, doPost, doPut, doTrace, encodeBase64, generateETag, getLastModified, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait

Field Detail

home

private CourseHome home

The course local home interface. It is set in the servlet's init() method.

Constructor Detail

FindServlet

public FindServlet()

Method Detail

init

public void init()
          throws javax.servlet.ServletException

Finds the course's home interface using JNDI. Since the home interface never changes, looking it up in the init() interface avoids the relatively slow JNDI call for each request.

The course bean is located at java:comp/env/cmp/finder_CourseBean.

Overrides:

init in class javax.servlet.GenericServlet

Throws:

javax.servlet.ServletException - if the JNDI lookup fails.

service

public void service(javax.servlet.http.HttpServletRequest req,
                    javax.servlet.http.HttpServletResponse res)
             throws java.io.IOException,
                    javax.servlet.ServletException

Overrides:

service in class javax.servlet.http.HttpServlet