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]]> - 使用Ldap˜qžæŽ¥æ±?/title><link>http://www.aygfsteel.com/Hut/archive/2005/08/01/8942.html</link><dc:creator>Hut</dc:creator><author>Hut</author><pubDate>Mon, 01 Aug 2005 09:21:00 GMT</pubDate><guid>http://www.aygfsteel.com/Hut/archive/2005/08/01/8942.html</guid><wfw:comment>http://www.aygfsteel.com/Hut/comments/8942.html</wfw:comment><comments>http://www.aygfsteel.com/Hut/archive/2005/08/01/8942.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Hut/comments/commentRss/8942.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Hut/services/trackbacks/8942.html</trackback:ping><description><![CDATA[<!--StartFragment --> æ¥æºåQ?A >http://java.sun.com/products/jndi/tutorial/ldap/connect/pool.html</A><BR><BR>SampleåQ?BR><PRE>import javax.naming.*;<BR>import javax.naming.directory.*;<BR><BR>import java.util.Hashtable;<BR><BR>/**<BR> * Demonstrates how to enable connection pooling. Use debug option<BR> * to observe connection usage.<BR> *<BR> * usage: java -Dcom.sun.jndi.ldap.connect.pool.debug=fine UsePool<BR> */<BR>class UsePool {<BR> public static void main(String[] args) {<BR> // Set up environment for creating initial context<BR> Hashtable env = new Hashtable(11);<BR> env.put(Context.INITIAL_CONTEXT_FACTORY, <BR> "com.sun.jndi.ldap.LdapCtxFactory");<BR> env.put(Context.PROVIDER_URL, "ldap://localhost:389/o=JNDITutorial");<BR><BR> // Enable connection pooling<BR> env.put("com.sun.jndi.ldap.connect.pool", "true");<BR><BR> try {<BR> // Create one initial context (Get connection from pool)<BR> DirContext ctx = new InitialDirContext(env);<BR><BR> System.out.println(ctx.getAttributes("ou=NewHires"));<BR><BR> // do something useful with ctx<BR><BR> // Close the context when we're done<BR> ctx.close(); // Return connection to pool<BR><BR> // Create another initial context (Get connection from pool)<BR> DirContext ctx2 = new InitialDirContext(env);<BR><BR> System.out.println(ctx2.getAttributes("ou=People"));<BR><BR> // do something useful with ctx2<BR><BR> // Close the context when we're done<BR> ctx2.close(); // Return connection to pool<BR><BR> } catch (NamingException e) {<BR> e.printStackTrace();<BR> }<BR> }<BR>}</PRE><A name=TIMEOUT>
<H4>Creation Timeout</H4></A>The pool of connections maintained by the LDAP service provider may be limited in size; this is described in detail in the <A >Connection Pooling Configuration</A> section. When connection pooling has been enabled and no pooled connection is available, the client application will block, waiting for an available connection. You can use the <TT>"com.sun.jndi.ldap.connect.timeout"</TT> environment property to specify how long to wait for a pooled connection. If you omit this property, the application will wait indefinitely.
<P>This same property is also used to specify a timeout period for establishment of the LDAP connection, as described in the <A >Connection Creation</A> section. </P>
<H4>When Not to Use Pooling</H4>Pooled connections are intended to be reused. Therefore, if you plan to perform operations on a <TT>Context</TT> instance that might alter the underlying connection's state, then you should not use connection pooling for that <TT>Context</TT> instance. For example, if you plan to invoke the Start TLS extended operation on a <TT>Context</TT> instance, or plan to change security-related properties (such as <TT>"java.naming.security.principal"</TT> or <TT>"java.naming.security.protocol"</TT>) after the initial context has been created, you should not use connection pooling for that <TT>Context</TT> instance because the LDAP provider does not track any such state changes. If you use connection pooling in such situations, you might be compromising the security of your application.<BR><BR>----------------------------------------------------------------------------------------------------<BR>
<H2>Connection Pooling Configuration</H2><A >http://java.sun.com/products/jndi/tutorial/ldap/connect/config.html</A> <img src ="http://www.aygfsteel.com/Hut/aggbug/8942.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Hut/" target="_blank">Hut</a> 2005-08-01 17:21 <a href="http://www.aygfsteel.com/Hut/archive/2005/08/01/8942.html#Feedback" target="_blank" style="text-decoration:none;">å‘表评论</a></div>]]></description></item></channel></rss> <footer>
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