请教和 ... 的区别

dr2tr 2006-04-23 10:24:17

书上说：
a jsp:useBean element results in a new bean being instantiated only if no bean with the same id and scope can be found. If a bean with the id and scope is found, the preexisting bean is simply bound to the variable referenced by id.

但实际上，我通过程序的测试发现，<jsp:useBean .... />根本就是执行了create，而不是bound啊

能解释一下吗？

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yzk0370 2006-04-23

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<tag>...</tag>是标准的标签配对方式，不过如果标签是单边的就要用<tag.../>方式

junjunok 2006-04-23

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在CREATE时<jsp:useBean> .... </jsp:useBean>似乎比<jsp:useBean .... />好用，BOUND么正相反

zhangxp2006 2006-04-23

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这两个应该是没有区别的

dr2tr 2006-04-23

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《core Servlet and Java》
“the statement between (<jsp:useBean> .... </jsp:useBean>) executed only if a new bean is created, not if an existing bean is used. "

这个应该是比较正确的说法

sheep219 2006-04-23

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lip009 2006-04-23

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有那么一点点区别，如果你要给这个javaBean设置参数，你就必须用
<jsp:useBean>
<jsp:setProperty></jsp:setProperty>
</jsp:useBean>这种写法

dr2tr 2006-04-23

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但是这段话如何理解呢？
a jsp:useBean element results in a new bean being instantiated only if no bean with the same id and scope can be found. If a bean with the id and scope is found, the preexisting bean is simply bound to the variable referenced by id.

from: Java Servlet Programming(Jason Hunter)