【黑马程序员】EL表达式与JSTL标签的结合用法.doc

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1、文档『黑马程序员』EL表达式与JSTL标签的结合用法EL与JSTL作为JAVAWEB开发者来说,熟练的运用它们,在View模式下效率更高.因为它们的存在,基本上在视图页是不会出现JAVA代码的!它们的强大之处将在下面一一列举!至于概念性的就不多说了,就以例子来介绍!target.jsp：[AppleScript]纯文本查看复制代码?001002003004005006007<%pagelanguage="java"contentType="text/html;charset=GB2312"import=".itcast.el.*,jav

2、a.util.*"%>                <%--    Objectobj=session.getAttribute("person");    if(obj!=null){31/31文档008009010011012013014015016017018     Pe

3、rsonp=(Person)obj;   %>    name:<%=p.getName()%>
    email:<%=p.getEmail()%>
    password:<%=p.getPassword()%>    <%     }    --%>         1.
    name:${sessionScope.person.name}--${sessionScope["person"].name}
    email:${sessionScope.person.email}
    pa

4、ssword:${sessionScope.person.password}

         2.    <%     //pageContext.setAttribute("username","Bob");            application.setAttribute("username","Bob");    %>    
依次从pagerequestsession31/31文档019020021022023024025026027028029application中寻找指定的属性值
    

5、username:${username}--(原理:<%=pageContext.findAttribute("username")%>)    

         3.
    <%     Stringage=request.getParameter("age");     out.println("age+12(error):"+(age+12)+",(right):"+(Integer.parseInt(age)+12));    %>    
    age+12:${param.age+12}   

6、 

         4.
    <%     Personp=newPerson();     p.setEmail("email123");     p.setName("Tom123");     p.setPassword("123456123");31/31文档030031032033034035036037038039040     request.setAttribute("person123",p);    %>    requestScope.person.email:((强转成javaBean类

7、型)request.getAttribute("person123")).getEmail();
    email:${requestScope.person123.email}    

         5.
    <%     inti=0;    %>    <%=i%>    name:${param.name}---<%=request.getParameter("name")%>
    age:${param.age}---<%=request.getParameter("age")%>

8、
    interesing:${paramValues.interesing[0]}   ${paramValues.interesing[1]}                ---