EL中运算符:
==/eq
!=/ne
</lt
>/gt
<=/le
>=/ge
&&/and
||/or
!/not
//div
%/mod
==/eq
!=/ne
</lt
>/gt
<=/le
>=/ge
&&/and
||/or
!/not
//div
%/mod
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<h1>测试EL表达式</h1><br>
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<hr>
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<li>普通字符串</li><br>
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hello(jsp脚本):<%=request.getAttribute("hello") %><br>
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hello(el表达式,el表达式的使用方法$和{}):${hello }<br>
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hello(el表达式,el的隐含对象pageScope,requestScope,sessionScope,applicationScope,<br> 如果未指定scope,它的搜索顺序为pageScope~applicationScope):${requestScope.hello }<br>
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hello(el表达式,scope=session):${sessionScope.hello }<br>
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<p>
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<li>结构,采用.进行导航,也称存取器</li><br>
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姓名:${user.username }<br>
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年龄:${user.age }<br>
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所属组:${user.group.name }<br>
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<p>
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<li>输出map,采用.进行导航,也称存取器</li><br>
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mapvalue.key1:${mapvalue.key1 }<br>
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mapvalue.key2:${mapvalue.key2 }<br>
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<p>
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<li>输出数组,采用[]和下标</li><br>
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strarray[2]:${strarray[1] }<br>
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<p>
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<li>输出对象数组,采用[]和下标</li><br>
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userarray[3].username:${users[2].username }<br>
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<p>
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<li>输出list,采用[]和下标</li><br>
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userlist[5].username:${userlist[4].username }<br>
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<p>
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<li>el表达式对运算符的支持</li><br>
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1+2=${1+2 }<br>
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10/5=${10/5 }<br>
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10 div 5=${10 div 5 }<br>
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10%3=${10 % 3 }<br>
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10 mod 3=${10 mod 3 }<br>
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<!--
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==/eq
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!=/ne
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</lt
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>/gt
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<=/le
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>=/ge
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&&/and
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||/or
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!/not
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//div
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%/mod
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-->
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<li>测试empty</li><br>
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value1:${empty value1 }<br>
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value2:${empty value2 }<br>
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value3:${empty value3 }<br>
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value4:${empty value4 }<br>
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value4:${!empty value4 }<br>
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