Kenyth Zeng's Library tagged servlet → View Popular

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02 Nov 09

Apache Tomcat 4 - Class Loader HOW-TO

tomcat.apache.org/...class-loader-howto.html - Preview

tomcat doc classloader starred servlet-container servlet 4.1

Apache Tomcat 6.0 - Class Loader HOW-TO

tomcat.apache.org/...class-loader-howto.html - Preview

tomcat i18n doc classloader starred servlet-container servlet 6.0

Some JVMs may
implement this as more than one class loader, or it may not be visible
(as a class loader) at all.
the standard Tomcat 6 startup scripts
($CATALINA_HOME/bin/catalina.sh or
%CATALINA_HOME%\bin\catalina.bat) totally ignore the contents
of the CLASSPATH environment variable itself
6 more annotations...
- All unpacked classes and resources in
  $CATALINA_HOME/lib
- tomcat-i18n-**.jar - Optional JARs containing resource bundles
  for other languages. As default bundles are also included in each
  individual JAR, they can be safely removed if no internationalization
  of messages is needed.
- When a request to load a
  class from the web application's WebappX class loader is processed,
  this class loader will look in the local repositories first,
  instead of delegating before looking.
- All other class loaders in Tomcat 6 follow the usual delegation pattern.
- JDK 1.5 supports a mechanism called the "Endorsed Standards Override
  Mechanism" to allow replacement of APIs created outside of the JCP (i.e.
  DOM and SAX from W3C). It can also be used to update the XML parser
  implementation.
- Tomcat utilizes this mechanism by including the system property setting
  -Djava.endorsed.dirs=$JAVA_ENDORSED_DIRS in the
  command line that starts the container.

01 Nov 09

page 2 > The Chain of Responsibility pattern's pitfalls and improvements - JavaWorld

www.javaworld.com/...jw-0816-chain.html - Preview

pattern article best-practice servlet filter event starred

By nature, a global event hook chain is not classic CoR. The event must be delivered to all listeners in the chain,
regardless of whether a listener already handles it. So the CallNextHookEx() call seems to be the job of the base class, not the individual listeners. Letting the individual listeners make the call
doesn't do any good and introduces the possibility for stopping the chain accidentally.
"4. a) Either invoke the next entity in the chain using the FilterChain object (chain.doFilter()), 4. b) or not pass on the request/response pair to the next entity in the filter chain to block the request processing."

page 1 > The Chain of Responsibility pattern's pitfalls and improvements - JavaWorld

www.javaworld.com/...jw-0816-chain.html - Preview

pattern article best-practice servlet filter event starred

I wrote two Java programs (for Microsoft Windows OS) that must catch global keyboard events generated by other applications
concurrently running on the same desktop. Microsoft provides a way to do that by registering the programs as a global keyboard
hook listener.
The code that registers the program itself as a hook listener was missing the CallNextHookEx() call required by the hook framework.
1 more annotations...
- Events are sent to the first listener in the chain. To allow all
  listeners to receive events, each listener must make the CallNextHookEx() call to relay the events to the listener next to it. If any listener forgets to do so, the subsequent listeners will not
  get the events; as a result, their designed functions will not work.

18 May 09

[疑难杂症]终于搞清了getServletContext()空指针异常的原因了～～ - windelk - JavaEye技术网站

windelk.javaeye.com/147177 - Preview

troubleshooting servlet

原来我重写了init(ServletConfig)，但第一行没有调用super.init(config)；就是这导致了错误！父类的init(ServletConfig)有处理获取ServletContext对象的引用，在doGet()等方法中才能够通过getServletContext()方法获取到SeverletContext对象！！

Hello World - cometd | The Dojo Toolkit

www.dojotoolkit.org/...hello-world-cometd - Preview

tutorial getting-started dojo comet jetty cometd tomcat servlet

I am using the Tomcat 6 server with the Jetty continuation servlet

17 May 09

page 6 > Asynchronous HTTP and Comet architectures - JavaWorld

www.javaworld.com/...jw-03-asynchhttp.html - Preview

http comet servlet 3.0 feature starred

The long poll is one of the two Comet strategies to reduce the frequency of HTTP calls
The second Comet strategy is response body streaming.
6 more annotations...
- // handle the time request
  if (req.getRequestURI().endsWith("/time")) {
  
  // write the message header by retrieving the body handle
  final BodyDataSink outChannel = respCtx.send(new HttpResponseHeader(200, "text/html"));
  
  // timer task definition
  TimerTask timerTask = new TimerTask() {
  
  public void run() {
  try {
  String script = "<script>\r\n" +
  " parent.printTime(\"" + new Date().toString() + "\");\r\n" +
  "</script>";
  outChannel.write(script);
  } catch (IOException ioe) {
  cancel();
  try {
  outChannel.close();
  } catch (IOException ignore) { }
  }
  }
  };
  
  // start the timer task
  timer.schedule(timerTask, 0, 1000);
- Comet support is one of the key features of the upcoming Servlet API 3.0.
- The continuation suspends the request and frees the current servlet
  request-handling thread.
- In this sense a Jetty continuation is not a "true" continuation: a classic continuation
  represents an execution state of a program at a certain point.
- The Jetty approach implies that the service method
  is idempotence, which means it yields the same result after the method is applied multiple times.
- Grizzly, the NIO framework on which the Glassfish HTTP Listener is built, also handles Comet events. In contrast to Tomcat, Grizzly's
  Comet event handling is integrated with the servlet's service methods.

14 May 09

Resin : Tutorials : Server-Push Servlet

www.caucho.com/...servlet-comet - Preview

tutorial java servlet comet example code ajax resin push-tech

the browser executes the script as part of its
progressive rendering, the user will see the updates immediately without
waiting for the entire HTTP request to complete.
The CometController is Resin's thread-safe encapsulation
of control and communication from the application's service to the
Comet servlet.
4 more annotations...
- As with other servlets, the
  ServletRequest, ServletResponse, writers and
  output stream can only be used by the servlet thread itself, never by
  any other threads.
- Either the
  service() or resume() methods may return false,
  telling Resin to close the connection. The service might call
  CometController.close() which will also close the connection.
- after the service() completes, Resin suspends the servlet.
  The TimerService detects an event, in this case the timer event.
  The TimerService calls controller.setAttribute() to send new data.
  The TimerService calls controller.wake() to wake the servlet.

WEB-INF/classes/example/TestCometServlet.java

www.caucho.com/...viewfile - Preview

comet code servlet java http http-header

res.setHeader("Cache-Control", "no-cache, must-revalidate");
res.setHeader("Expires", "Mon, 27 Jul 1997 05:00:00 GMT");

res.setContentType("text/html");

out.println("<html><body>");

29 Apr 09

Building a Server-based Application with Equinox

www.eclipse.org/...server-side - Preview

Equinox servlet server OSGi tutorial eclipse getting-started

put a
check next to the org.eclipse.equinox.http.jetty bundle

06 Jan 09

Servlet Tutorial: Handling Form Data

www.apl.jhu.edu/...ervlet-Tutorial-Form-Data.html - Preview

tutorial servlet java example

It can be
attached to the end of the URL after a question mark (as above), for
GET requests, or sent to the server on a separate line, for
POST requests.
traditionally
one of the most tedious parts of CGI programming
6 more annotations...
- spaces get converted to plus signs
- a parameter
  can have more than one value in that the same parameter
  can appear more than once
- parameter names are case sensitive
- uudecoded value
- first occurrence of that parameter name
- If the
  parameter could potentially have more than one value, as in the example
  above, you should call getParameterValues instead of
  getParameter.

06 Oct 08

OpenEntityManagerInViewFilter (Spring Framework API 2.5)

static.springframework.org/...EntityManagerInViewFilter.html - Preview

javadoc api session jpa transaction ORM spring-web-mvc filter servlet

Servlet 2.3 Filter that binds a JPA EntityManager to the thread for the
entire processing of the request.

OpenSessionInViewFilter (Spring Framework API 2.5)

static.springframework.org/...OpenSessionInViewFilter.html - Preview

javadoc api session hibernate transaction ORM spring-web-mvc filter servlet

Servlet 2.3 Filter that binds a Hibernate Session to the thread for the entire
processing of the request.

24 Aug 08

Diff btw response.sendRedirect, jsp:forward and RequestDispatch .forward methods? (Servlets forum at JavaRanch)

saloon.javaranch.com/...ultimatebb.cgi - Preview

javaee comparison jsp servlet jsp:forward

It actually modifies response header and tells the client the browser that the requested page is relocated and header also contains the new location of the page.
No response is send to the browser, the web container internally redirects the request to the other page.
1 more annotations...
- two flavours of RequestDispatcher , one : you get from ServletContext .The pathname must begin with a "/" and is interpreted as relative to the current context root.
  Second : you get from ServletRequest. The pathname specified may be relative, although it cannot extend outside the current servlet context. If the path begins with a "/" it is interpreted as relative to the current context root

23 Aug 08

RequestDispatcher (Java EE 5)

java.sun.com/...RequestDispatcher.html - Preview

servlet javax api Java EE 5 javadoc

as a wrapper around a server resource located
at a particular path or given by a particular name
This interface is intended to wrap servlets
1 more annotations...
- forward should be called before the response has been
  committed to the client (before response body output has been flushed).

ServletConfig (Java EE 5)

java.sun.com/...ServletConfig.html - Preview

config servlet api doc javaee

Implementing Classes:
GenericServlet, HttpServlet

HttpSession (Java EE 5)

java.sun.com/...HttpSession.html - Preview

Java EE 5 api javaee servlet javadoc doc httpsession session

across more than one page
request
The session persists
for a specified time period, across more than one connection or
page request from the user
4 more annotations...
- The server can maintain a
  session in many ways such as using cookies or rewriting URLs.
- This interface allows servlets to
  
  View and manipulate information about a session, such as
  the session identifier, creation time, and last accessed time
  
  Bind objects to sessions, allowing user information to persist
  across multiple user connections
- A servlet should be able to handle cases in which
  the client does not choose to join a session, such as when cookies are
  intentionally turned off.
- Session information is scoped only to the current web application
  (ServletContext), so information stored in one context
  will not be directly visible in another.

09 May 08

ONJava.com -- Servlet Best Practices, Part 1

www.onjava.com/...index1.html - Preview

tutorial session servlet article

Servlet Tutorial: Session Tracking

www.apl.jhu.edu/...Tutorial-Session-Tracking.html - Preview

servlet tutorial session http

HTTP
is a "stateless" protocol
three typical solutions
7 more annotations...
- Cookies.
- use HTTP
  cookies to store information about a shopping session, and each
  subsequent connection can look up the current session and then
  extract information about that session from some location on
  the server machine.
- Extracting the cookie that stores the session identifier
- expiration time
- URL Rewriting
- Hidden form fields
- HttpSession session = request.getSession(true);

Cookie (Java EE 5)

java.sun.com/...Cookie.html - Preview

Java EE 5 api javaee servlet javadoc doc cookie

saved by the browser, and later sent back to the server
sent by a servlet to
a Web browser, saved by the browser, and later sent back to the server
4 more annotations...
- The browser is expected to
  support 20 cookies for each Web server, 300 cookies total, and
  may limit cookie size to 4 KB each.
- Cookies affect the caching of the Web pages that use them.
  HTTP 1.0 does not cache pages that use cookies created with
  this class. This class does not support the cache control
  defined with HTTP 1.1.
- public String getPath()
  
  Returns the path on the server
  to which the browser returns this cookie. The
  cookie is visible to all subpaths on the server.
- public void setSecure(boolean flag)
  
  Indicates to the browser whether the cookie should only be sent
  using a secure protocol, such as HTTPS or SSL.

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