Wed, 25 Mar 2009 11:27:00 GMT知行合一http://blog.csdn.net/kingquake21/http://blog.csdn.net/kingquake21/archive/2009/03/25/4022811.aspxhttp://blog.csdn.net/kingquake21/comments/4022811.aspx0http://blog.csdn.net/kingquake21/comments/commentRss/4022811.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=4022811<br /> interface Collection { public boolean containsAll(Collection c); public boolean addAll(Collection c); // hey, type variables can have bounds too! }<br /><br />刚开始看到这样的方法定义时不知道方法返回类型前面的有什么用，其实这就是泛型方法的定义方式。<br /><br />以前总是通过在类的定义中加参数化类型，如果只需对某个方法做泛型处理，可以通过这种方式将方法的参数和返回值类型泛型化。<br /><br /><img src ="http://blog.csdn.net/kingquake21/aggbug/4022811.aspx" width = "1" height = "1" />Wed, 25 Mar 2009 19:27:00 +0800lorbhttp://blog.csdn.net/kingquake21/archive/2009/03/25/4022811.aspx#Feedbackhttp://blog.csdn.net/kingquake21/archive/2009/03/25/4022811.aspxlorbhttp://blog.csdn.net/kingquake21/archive/2009/03/25/4022811.aspxhttp://blog.csdn.net/kingquake21/rss.aspxcsdn.net/kingquake21/~1345591/206305963/1350529http://blog.csdn.net/kingquake21/archive/2009/03/17/3996782.aspxhttp://blog.csdn.net/kingquake21/comments/3996782.aspx0http://blog.csdn.net/kingquake21/comments/commentRss/3996782.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=3996782<br />1.dependency<br />   当一个类使用了另一个类的实例。例：<br />   class A{ void method(){ B b = new B(); b.anotherMethod(); } }<br />2.association<br />   一个类拥有其他类的一个或多个对象，以属性的形式。例：<br />class A{ B b ; void method(){ b.anotherMethod(); } }<br />3.aggregation和composition<br />   这两者是association的强关系版。区别是<br />   aggregation：此类拥有另外类的实例，同时这个实例也可能被别的类共享使用；即，当此类被GC后，所拥有的实例并不会被GC；aggregation采用空心菱形表示<br />   composition：此类拥有另外类的实例，同时这个实例不被别的类共享使用；即，当此类被GC后，所拥有的实例就会被GC；composition<img src ="http://blog.csdn.net/kingquake21/aggbug/3996782.aspx" width = "1" height = "1" />Tue, 17 Mar 2009 16:59:00 +0800lorbhttp://blog.csdn.net/kingquake21/archive/2009/03/17/3996782.aspx#Feedbackhttp://blog.csdn.net/kingquake21/archive/2009/03/17/3996782.aspxlorbhttp://blog.csdn.net/kingquake21/archive/2009/03/17/3996782.aspxhttp://blog.csdn.net/kingquake21/rss.aspxcsdn.net/kingquake21/~1345591/206305964/1350529http://blog.csdn.net/kingquake21/archive/2009/03/09/3973288.aspxhttp://blog.csdn.net/kingquake21/comments/3973288.aspx0http://blog.csdn.net/kingquake21/comments/commentRss/3973288.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=3973288springframework java.lang.ClassNotFoundException<br />收集了几个异常：<br />(1)org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class <br />'com.microsoft.sqlserver.jdbc.SQLServerDriver'<br />      答：sqljdbc.jar<br />(2)java.lang.ClassNotFoundException: org.springframework.ejb.config.JeeNamespaceHandler<br />     答：spring-remoting.jar<br />(3)java.lang.ClassNotFoundException: org.springframework.scripting.config.LangNamespaceHandler    <br />     答：spring-support.jar<br />(4)java.<img src ="http://blog.csdn.net/kingquake21/aggbug/3973288.aspx" width = "1" height = "1" />Mon, 09 Mar 2009 23:07:00 +0800lorbhttp://blog.csdn.net/kingquake21/archive/2009/03/09/3973288.aspx#Feedbackhttp://blog.csdn.net/kingquake21/archive/2009/03/09/3973288.aspxlorbhttp://blog.csdn.net/kingquake21/archive/2009/03/09/3973288.aspxhttp://blog.csdn.net/kingquake21/rss.aspxcsdn.net/kingquake21/~1345591/206305965/1350529http://blog.csdn.net/kingquake21/archive/2009/03/09/3971555.aspxhttp://blog.csdn.net/kingquake21/comments/3971555.aspx0http://blog.csdn.net/kingquake21/comments/commentRss/3971555.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=3971555<br />http://www.twvbb.com/vbb/forum/32/<img src ="http://blog.csdn.net/kingquake21/aggbug/3971555.aspx" width = "1" height = "1" />Mon, 09 Mar 2009 18:37:00 +0800lorbhttp://blog.csdn.net/kingquake21/archive/2009/03/09/3971555.aspx#Feedbackhttp://blog.csdn.net/kingquake21/archive/2009/03/09/3971555.aspxlorbhttp://blog.csdn.net/kingquake21/archive/2009/03/09/3971555.aspxhttp://blog.csdn.net/kingquake21/rss.aspxcsdn.net/kingquake21/~1345591/206305966/1350529http://blog.csdn.net/kingquake21/archive/2009/03/05/3960508.aspxhttp://blog.csdn.net/kingquake21/comments/3960508.aspx0http://blog.csdn.net/kingquake21/comments/commentRss/3960508.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=3960508<br />首先，需要准备三个文件（1.win32平台的comm.jar;2.win32com.dll;3.javax.comm.properties）<br />其次，将win32com.dll放入java.library.path下面（可以System.out.println(System.getProperty("java.library.path"));将路径打出来看）<br />然后，将comm.jar包放在classpath上面。<br />再次，配置文件javax.comm.properties需要放在所运行的JRE的LIB下。我的目录是：D:\Program Files\Java\jre6\lib。这个没有放好的话将会报NoSuchPortException (当驱动程序不能找到指定端口时抛出）<br />最后，完成<br /><br />注：一般在串口上的问题都是由上述配置不正确导致的<img src 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+0800lorbhttp://blog.csdn.net/kingquake21/archive/2009/02/25/3934920.aspx#Feedbackhttp://blog.csdn.net/kingquake21/archive/2009/02/25/3934920.aspxlorbhttp://blog.csdn.net/kingquake21/archive/2009/02/25/3934920.aspxhttp://blog.csdn.net/kingquake21/rss.aspxcsdn.net/kingquake21/~1345591/206305968/1350529http://blog.csdn.net/kingquake21/archive/2009/02/24/3932146.aspxhttp://blog.csdn.net/kingquake21/comments/3932146.aspx0http://blog.csdn.net/kingquake21/comments/commentRss/3932146.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=3932146<br />两者都是为了初始化用，不推荐在构造函数中对servlet做初始化工作<br />由于servlet实例的生命周期是由容器控制的。构造函数中的初始化工作只会在容器构造这个servlet时做一次。但是servlet的实例是会被多个请求所复用的，但是构造函数却只能提供一次初始化，所以必须将初始化工作放入init中，由容器来控制<img src ="http://blog.csdn.net/kingquake21/aggbug/3932146.aspx" width = "1" height = "1" />Tue, 24 Feb 2009 22:26:00 +0800lorbhttp://blog.csdn.net/kingquake21/archive/2009/02/24/3932146.aspx#Feedbackhttp://blog.csdn.net/kingquake21/archive/2009/02/24/3932146.aspxlorbhttp://blog.csdn.net/kingquake21/archive/2009/02/24/3932146.aspxhttp://blog.csdn.net/kingquake21/rss.aspxcsdn.net/kingquake21/~1345591/206305969/1350529http://blog.csdn.net/kingquake21/archive/2009/02/17/3901409.aspxhttp://blog.csdn.net/kingquake21/comments/3901409.aspx0http://blog.csdn.net/kingquake21/comments/commentRss/3901409.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=3901409总共三个类，消费者、生产者、消息队列<img src ="http://blog.csdn.net/kingquake21/aggbug/3901409.aspx" width = "1" height = "1" />Wed, 18 Feb 2009 01:01:00 +0800lorbhttp://blog.csdn.net/kingquake21/archive/2009/02/17/3901409.aspx#Feedbackhttp://blog.csdn.net/kingquake21/archive/2009/02/17/3901409.aspxlorbhttp://blog.csdn.net/kingquake21/archive/2009/02/17/3901409.aspxhttp://blog.csdn.net/kingquake21/rss.aspxcsdn.net/kingquake21/~1345591/206305970/1350529http://blog.csdn.net/kingquake21/archive/2009/02/12/3882158.aspxhttp://blog.csdn.net/kingquake21/comments/3882158.aspx0http://blog.csdn.net/kingquake21/comments/commentRss/3882158.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=3882158<br /><img src ="http://blog.csdn.net/kingquake21/aggbug/3882158.aspx" width = "1" height = "1" />Thu, 12 Feb 2009 23:39:00 +0800lorbhttp://blog.csdn.net/kingquake21/archive/2009/02/12/3882158.aspx#Feedbackhttp://blog.csdn.net/kingquake21/archive/2009/02/12/3882158.aspxlorbhttp://blog.csdn.net/kingquake21/archive/2009/02/12/3882158.aspxhttp://blog.csdn.net/kingquake21/rss.aspxcsdn.net/kingquake21/~1345591/206305971/1350529http://blog.csdn.net/kingquake21/archive/2009/02/11/3876772.aspxhttp://blog.csdn.net/kingquake21/comments/3876772.aspx0http://blog.csdn.net/kingquake21/comments/commentRss/3876772.aspxhttp://tb.blog.csdn.net/TrackBack.aspx?PostId=3876772当客户端的链接异常断开，此时代表这个链接的channel一直处于readable的状态，如何检查链接已断开呢？<img src ="http://blog.csdn.net/kingquake21/aggbug/3876772.aspx" width = "1" height = "1" />Wed, 11 Feb 2009 20:36:00 +0800lorbhttp://blog.csdn.net/kingquake21/archive/2009/02/11/3876772.aspx#Feedbackhttp://blog.csdn.net/kingquake21/archive/2009/02/11/3876772.aspxlorbhttp://blog.csdn.net/kingquake21/archive/2009/02/11/3876772.aspxhttp://blog.csdn.net/kingquake21/rss.aspxcsdn.net/kingquake21/~1345591/206305972/1350529