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portal越来越流行了

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<A NAME="init(javax.portlet.PortletConfig)"><!-- --></A><H3>
init</H3>
<PRE>
void <B>init</B>(<A HREF="../../javax/portlet/PortletConfig.html" title="interface in javax.portlet">PortletConfig</A>&nbsp;config)
          throws <A HREF="../../javax/portlet/PortletException.html" title="class in javax.portlet">PortletException</A></PRE>
<DL>
<DD>Called by the portlet container to indicate to a portlet that the 
 portlet is being placed into service.

 <p>The portlet container calls the <code>init</code>
 method exactly once after instantiating the portlet.
 The <code>init</code> method must complete successfully
 before the portlet can receive any requests.

 <p>The portlet container cannot place the portlet into service
 if the <code>init</code> method
 <ol>
 <li>Throws a <code>PortletException</code>
 <li>Does not return within a time period defined by the portlet container.
 </ol>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>config</CODE> - a <code>PortletConfig</code> object 
                                        containing the portlet's
                                        configuration and initialization parameters
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javax/portlet/PortletException.html" title="class in javax.portlet">PortletException</A></CODE> - if an exception has occurred that
                                        interferes with the portlet's normal
                                        operation.
<DD><CODE><A HREF="../../javax/portlet/UnavailableException.html" title="class in javax.portlet">UnavailableException</A></CODE> - if the portlet cannot perform the initialization at this time.</DL>
</DD>
</DL>
<HR>

<A NAME="processAction(javax.portlet.ActionRequest, javax.portlet.ActionResponse)"><!-- --></A><H3>
processAction</H3>
<PRE>
void <B>processAction</B>(<A HREF="../../javax/portlet/ActionRequest.html" title="interface in javax.portlet">ActionRequest</A>&nbsp;request,
                   <A HREF="../../javax/portlet/ActionResponse.html" title="interface in javax.portlet">ActionResponse</A>&nbsp;response)
                   throws <A HREF="../../javax/portlet/PortletException.html" title="class in javax.portlet">PortletException</A>,
                          java.io.IOException</PRE>
<DL>
<DD>Called by the portlet container to allow the portlet to process
 an action request. This method is called if the client request was
 originated by a URL created (by the portlet) with the 
 <code>RenderResponse.createActionURL()</code> method.
 <p>
 Typically, in response to an action request, a portlet updates state 
 based on the information sent in the action request parameters.
 In an action the portlet may:
 <ul>
 <li>issue a redirect
 <li>change its window state
 <li>change its portlet mode
 <li>modify its persistent state
 <li>set render parameters
 </ul>
 <p>
 A client request triggered by an action URL translates into one 
 action request and many render requests, one per portlet in the portal page.
 The action processing must be finished before the render requests
 can be issued.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>request</CODE> - the action request<DD><CODE>response</CODE> - the action response
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javax/portlet/PortletException.html" title="class in javax.portlet">PortletException</A></CODE> - if the portlet has problems fulfilling the
                   request
<DD><CODE><A HREF="../../javax/portlet/UnavailableException.html" title="class in javax.portlet">UnavailableException</A></CODE> - if the portlet is unavailable to process the action at this time
<DD><CODE><A HREF="../../javax/portlet/PortletSecurityException.html" title="class in javax.portlet">PortletSecurityException</A></CODE> - if the portlet cannot fullfill this request because of security reasons
<DD><CODE>java.io.IOException</CODE> - if the streaming causes an I/O problem</DL>
</DD>
</DL>
<HR>

<A NAME="render(javax.portlet.RenderRequest, javax.portlet.RenderResponse)"><!-- --></A><H3>
render</H3>
<PRE>
void <B>render</B>(<A HREF="../../javax/portlet/RenderRequest.html" title="interface in javax.portlet">RenderRequest</A>&nbsp;request,
            <A HREF="../../javax/portlet/RenderResponse.html" title="interface in javax.portlet">RenderResponse</A>&nbsp;response)
            throws <A HREF="../../javax/portlet/PortletException.html" title="class in javax.portlet">PortletException</A>,
                   java.io.IOException</PRE>
<DL>
<DD>Called by the portlet container to allow the portlet to generate
 the content of the response based on its current state.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>request</CODE> - the render request<DD><CODE>response</CODE> - the render response
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javax/portlet/PortletException.html" title="class in javax.portlet">PortletException</A></CODE> - if the portlet has problems fulfilling the
              rendering request
<DD><CODE><A HREF="../../javax/portlet/UnavailableException.html" title="class in javax.portlet">UnavailableException</A></CODE> - if the portlet is unavailable to perform render at this time
<DD><CODE><A HREF="../../javax/portlet/PortletSecurityException.html" title="class in javax.portlet">PortletSecurityException</A></CODE> - if the portlet cannot fullfill this request because of security reasons
<DD><CODE>java.io.IOException</CODE> - if the streaming causes an I/O problem</DL>
</DD>
</DL>
<HR>

<A NAME="destroy()"><!-- --></A><H3>
destroy</H3>
<PRE>
void <B>destroy</B>()</PRE>
<DL>
<DD>Called by the portlet container to indicate to a portlet that the
 portlet is being taken out of service.  
 <p>
 Before the portlet container calls the destroy method, it should 
 allow any threads that are currently processing requests within 
 the portlet object to complete execution. To avoid
 waiting forever, the portlet container can optionally wait for 
 a predefined time before destroying the portlet object.

 <p>This method enables the portlet to do the following:
 <ul>
 <li>clean up any resources that it holds (for example, memory,
 file handles, threads) 
 <li>make sure that any persistent state is
 synchronized with the portlet current state in memory.
 </ul>
<P>
<DD><DL>
</DL>
</DD>
</DL>
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