你的代码没有大问题,我调整了一下结构,你用用看!
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Condition Flow</title>
</head>
<body>
<h3>
Condition Flow
</h3>
<s:set name="name" value="<%="'" + request.getParameter("name") + "'"%>" />
<s:if test="#name == 'Max'">
Max's file here
</s:if>
<s:elseif test="#name == 'Scott'">
Scott's file here
</s:elseif>
<s:else>
Other's file here
</s:else>
</body>
</html>
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Condition Flow</title>
</head>
<body>
<h3>
Condition Flow
</h3>
<s:set name="name" value="<%="'" + request.getParameter("name") + "'"%>" />
<s:if test="#name == 'Max'">
Max's file here
</s:if>
<s:elseif test="#name == 'Scott'">
Scott's file here
</s:elseif>
<s:else>
Other's file here
</s:else>
</body>
</html>
<%%>这样的代码。你的action里面如果有getName()方法,
可以直接用<s:if test="name=='max'">
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Condition Flow</title>
</head>
<body>
<h3>Condition Flow</h3>
<!--
这里有点小技巧:
本来可以用#parameters.name[0]来获得,请求中name的值。但是,在我实现include例子时,
无论我用param标志给name赋任何值,#parameters里面不会含有任何值,所以#parameters.name也为空值。
其原因为:
当使用include标志时,被包含的页面(included)里#parameters拿到的是包含页面里的请求参数。
因此,这里必须手工调用request.getParameter("name")。
-->
<s:set name="name" value="Max" />
<s:if test="#name == 'Max'">
Max's file here
</s:if>
<s:elseif test="#name == 'Scott'">
Scott's file here
</s:elseif>
<s:else>
Other's file here
</s:else>
</body>
</html>这样没出错了,但输出结果是:Other's file here
搞不懂,按道理应该是输出Max's file here吧
==〉
<s:property value="#parameters.name" />
会报错ava.lang.ClassCastException: [Ljava.lang.String; cannot be cast to java.lang.String
at org.apache.struts2.components.Property.start(Property.java:136)
at org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:54)
at org.apache.jsp.unUi_jsp._jspx_meth_s_005fproperty_005f0(unUi_jsp.java:155)
at org.apache.jsp.unUi_jsp._jspService(unUi_jsp.java:95)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:390)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:413)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:212)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:818)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:624)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Unknown Source)