以下是从其官方网站的User Guide摘抄的对其功能的描述,
Introduce A String Constant - 从字符串常量创建bean
<bean:define id="foo" value="This is a new String"/>
<bean:define id="bar" value='<%= "Hello, " + user.getName() %>'/>
<bean:define id="last" scope="session"
value='<%= request.getRequestURI() %>'/>
Copy An Existing Bean - 为已有的bean创建新的引用(type属性声明该引用的类型)
<bean:define id="foo" name="bar"/>
<bean:define id="baz" name="bop" type="com.mycompany.MyBopClass"/>
Copy An Existing Bean Property - 从已存在的bean的属性创建bean。可以使用的bean的属性有三种:simple, nested, or indexed。
<bean:define id="foo" name="bar" property="baz" scope="request" toScope="session"/> <bean:define id="bop" name="user" property="role[3].name"/>
Other Struts Copying Tags
Copy A Cookie - 从cookie创建bean。如果指定的cookie不存在则会抛出运行时异常 - 因此,常和 <logic:present cookie="xxx"> 标签一起使用来保证cookie的存在。 通过指定multiple属性,可以从多个同名cookie创建一个包含多个cookie的数组。
<bean:cookie id="foo" name="cookiename"/>
<bean:cookie id="all" name="JSESSIONID" multiple="true"/>
Copy A Request Header - 从请求头创建bean。 (其余说明同上)
<bean:header id="agent" name="User-Agent"/> <bean:header id="languages" name="Accept-Language" multiple="true"/>
Copy A Dynamically Created Response - You can generate an internal request to the application you are running, and turn the response data that is returned from that request into a bean (of type String). One possible use for this technique is to acquire dynamically created XML formatted data that will be stored in a bean and later manipulated (such as by applying an XSLT stylesheet). If the current request is part of a session, the generated request for the include will also include the session identifier (and thus be considered part of the same session).(由于学识有限,这段还不太理解,所以没有翻译)
<bean:include id="text" name="/generateXml?param1=a¶m2=b"/>
Copy A JSP Implicitly Defined Object - 从JSP内置对象建立bean。
<bean:page id="app" property="application"/> <bean:page id="sess" property="session"/>
Copy A Request Parameter - 从请求参数建立bean。(其余说明同bean:cookie)
<bean:parameter id="name" name="name"/>
<bean:header id="options" name="option" multiple="true"/>
Copy a Web Application Resource - 从web应用程序资源建立一个包含web应用程序资源字符串、或一个InputStream输入流以供读取其中的资源的bean。
<bean:resource id="deployment" name="/WEB-INF/web.xml"/> <bean:resource id="stream" name="/WEB-INF/web.xml" input="true"/>
Copy A Struts Configuration Object - 从struts标准配置对象建立bean。
<bean:struts id="form" formBean="CustomerForm"/>
<bean:struts id="fwd" forward="success"/>
<bean:struts id="map" mapping="/saveCustomer"/>
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Bean Output
Render An Internationalized Message - 处理国际化message。在使用前要预先对该资源进行读取、配置等操作。
<bean:message key="label.Cancel"/>
<bean:message key="message.hello" arg0='<%= user.getFullName() %>'/>
Render A Bean or Bean Property - 输出bean或bean的属性。
<bean:write name="username"/>
<bean:write name="user" property="fullName"/>
<bean:write name="customer" property="orders[2].partNumber"
scope="session"/>
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