1、实例
(1)创建一个el.jsp,action也是el.jsp
![](https://upload-images.jianshu.io/upload_images/2058461-d1e74f284a0d4289.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
(2)随便写些东西
![](https://upload-images.jianshu.io/upload_images/2058461-d671db8cc0feae7b.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
(3)
![](https://upload-images.jianshu.io/upload_images/2058461-bd06ba8589f84ec3.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![](https://upload-images.jianshu.io/upload_images/2058461-6895e2904c72ce00.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![](https://upload-images.jianshu.io/upload_images/2058461-d673d6e3918ca441.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
(4)el2.jsp改为如下
![](https://upload-images.jianshu.io/upload_images/2058461-a906c85dab77a372.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
这样就正确了。。。
![](https://upload-images.jianshu.io/upload_images/2058461-dcc9bbee62dc1992.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
(5)点操作符合[]的用法
![](https://upload-images.jianshu.io/upload_images/2058461-bba732dd426182cb.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![](https://upload-images.jianshu.io/upload_images/2058461-5e9cf857f371da0e.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
(6)param,EL可以进行类型的自动转换
![](https://upload-images.jianshu.io/upload_images/2058461-5111947d744549b0.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![](https://upload-images.jianshu.io/upload_images/2058461-771fb79fb98366fb.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
2、隐含对象之范围相关的
pageScope、requestScope、sessionScope、applicationScope
3、其他隐含对象
pageContext、cookie、header、initParam
pageContext:${pageContext.request.contextPath}
sessionId:${pageContext.session.id }
![](https://upload-images.jianshu.io/upload_images/2058461-9e249c0bc91ae5a6.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
4、EL的关系运算符
![](https://upload-images.jianshu.io/upload_images/2058461-586e6b55b0b4c847.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![](https://upload-images.jianshu.io/upload_images/2058461-33b92480d10dec69.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
还有其他的运算符,与其他语言的用法一样。。。
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