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                            ## 概述
對象圖導航語言,是一種強大的表達式語言,是一門獨立的表達式語言.比EL強大.ognl屬于Struts2.Struts2只是把它整合到Struts2了.ognl不能再Struts2中單獨使用.必須要嵌套進Struts2內置標簽中使用.

## 使用
導入標簽:
~~~
<%@taglib prefix="s" uri="/struts-tags" %>
~~~
調用方法:
~~~
<s:property value="'hello'.length()"></s:property>
~~~
調用靜態屬性:

開啟可以使用靜態方法.

~~~
<s:property value="@java.lang.Math@PI"/>       //@全限定名@屬性
~~~
調用靜態方法:
~~~
<constant name="struts.ognl.allowStaticMethodAccess" value="true"/>
~~~
~~~
<s:property value="@java.lang.Math@random()"/>
~~~

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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