Prentice Hall and Sun Microsystems. Personal use only; do not redistribute.
522
Appendix A
Servlet and JSP Quick Reference
Servlet Life Cycle
  public void init() throws ServletException,
public void init(ServletConfig config) throws ServletException 
Executed once when the servlet is first loaded. Not called for each 
request. Use 
getInitParameter
 to read initialization parameters.
  public void service(HttpServletRequest request, 
public void service(
HttpServletResponse response) 
throws ServletException, IOException 
Called in a new thread by server for each request. Dispatches to 
doGet
, 
doPost
, etc. Do not override this method!
  public void doGet(HttpServletRequest request, 
public void doGet(
HttpServletResponse response) 
throws ServletException, IOException 
Handles 
GET
 requests. Override to provide your behavior.
  public void doPost(HttpServletRequest request, 
public void doPost(
HttpServletResponse response) 
throws ServletException, IOException 
Handles 
POST
 requests. Override to provide your behavior. If you want 
GET
 and 
POST
 to act identically, call 
doGet
 here.
  doPut, doTrace, doDelete, etc.
Handles the uncommon HTTP requests of 
PUT
, 
TRACE
, etc.
  public void destroy() 
Called when server deletes servlet instance. Not called after each 
request.
  public long getLastModified(HttpServletRequest request) 
Called by server when client sends conditional 
GET
 due to cached copy. 
See Section 2.8.
  SingleThreadModel
If this interface implemented, causes server to avoid concurrent 
invocations.
Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.
Servlet and JSP training courses by book's author: courses.coreservlets.com.






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