struts2標簽使用注意事項

soft_xiang 2011-04-21

展開全文

本文主要為項目過程中碰到Struts2的s標簽不能使用的問題的一個記錄，先將產生的原因記錄如下：

因過濾器配置不當引起s標簽不能使用

在jsp頁面中加入了<%@ taglib uri="/struts-tags" prefix="s" %>后使用s標簽報錯，錯誤如下：

org.apache.jasper.JasperException: An exception occurred processing JSP page /jsp/stores/AddStoresIn.jsp at line 95

92: 	</head>
93: 
94: 	<body>
95: 		<s:text name="gtest">asfdasfdsf</s:text>
96: 		<table class="mainTable" width="100%" border="0" cellspacing="0"
97: 			cellpadding="0">
98: 			<tr>


Stacktrace:
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

root cause

The Struts dispatcher cannot be found.  This is usually caused by using Struts tags without the associated filter. Struts tags are only usable when the request has passed through its servlet filter, which initializes the Struts dispatcher needed for this tag. - [unknown location]
	org.apache.struts2.views.jsp.TagUtils.getStack(TagUtils.java:60)
	org.apache.struts2.views.jsp.StrutsBodyTagSupport.getStack(StrutsBodyTagSupport.java:44)
	org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:48)
	org.apache.jsp.jsp.stores.AddStoresIn_jsp._jspx_meth_s_005ftext_005f0(AddStoresIn_jsp.java:462)
	org.apache.jsp.jsp.stores.AddStoresIn_jsp._jspService(AddStoresIn_jsp.java:152)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

參考文章：http://www./developer/article-bd15.html

原因：因為web.xml中的
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
攔截的是*.action的請求行為，如果不經過action就無法調用struts2的標簽包，使得s標簽無法使用
解決辦法：把<url-pattern>*.action</url-pattern>改為<url-pattern>/*</url-pattern>或者通過action訪問帶s標簽的jsp頁面

另一個注意事項，如果使用的是servlet2.3以下的規(guī)范須在web.xml加入taglib申明。。。。。