? struts 中如果配置多個module, 可能有問題, 我調(diào)試了struts源碼發(fā)現(xiàn)確實是問題, 有待于網(wǎng)友們進(jìn)一步確認(rèn).我使用的是struts1.1, 配置了兩個module:? 缺省: struts-config.xml , admin:?? struts-config-admin.xml

?
?? category.jsp
?? --------------------------------
?? <frameset rows="*" cols="180,*" frameborder="yes" framespacing="1px" border="0"? >
? ?? ?<frame? name="menuFrame" src="../categoryAction.jspx?method=loadAllMenus" scrolling="No" noresize="noresize"? >
? ?? ?<frame? name="deatilFrame" src="categoryDetail.jsp"? >
?? ----------------------------------

? categoryDetail.jsp
? ----------------------------------
?? ? <html:form action="categoryAction.jspx?method=saveCategory" >
????????? ... ...
????? <html:form>
? -----------------------------------

? struts-config-admin.xml:
? ------------------------------------
???? <action
????? attribute="categoryForm"
????? input="/product/categoryDetail.jsp"
????? name="categoryForm"
????? parameter="method"
????? path="/categoryAction"
????? scope="request"
????? validate="false"
????? type="com.book.web.struts.action.CategoryAction" >
???? ?
?????? <forward name="viewMenu" path="/product/categoryMenu.jsp" />
?????? <forward name="succ" path="/product/categoryDetail.jsp" />
????? </action>

? -----------------------------------
????? 以鏈接的形式訪問正確, 直接訪問action http://localhost:8080/promtion/admin/categoryAction.jspx?method=saveCategory 正確.


???? 但把a(bǔ)ction 放到j(luò)sp頁面中就出錯, http://localhost:8080/promtion/admin/category.jsp
??? javax.servlet.ServletException: Cannot retrieve mapping for action /categoryAction
?? ?org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
?? ?org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
?? ?org.apache.jsp.admin.product.categoryDetail_jsp._jspService(categoryDetail_jsp.java:101)
?? ?org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
?? ?javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
?? ?org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
?? ?org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
?? ?org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
?? ?javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
??
root cause
javax.servlet.jsp.JspException: Cannot retrieve mapping for action /categoryAction
?? ?org.apache.struts.taglib.html.FormTag.lookup(FormTag.java:810)
?? ?org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:506)???? org.apache.jsp.admin.product.categoryDetail_jsp._jspx_meth_html_form_0(categoryDetail_jsp.java:187)??? org.apache.jsp.admin.product.categoryDetail_jsp._jspx_meth_html_html_0(categoryDetail_jsp.java:147)
?? ?org.apache.jsp.admin.product.categoryDetail_jsp._jspService(categoryDetail_jsp.java:92)
?? ?org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
?? ?javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
?? ?org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
?? ?org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
?? ?org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
?? ?javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
?
我調(diào)試了struts 源碼發(fā)現(xiàn) 剛開始 也能取到module 的name 值為admin, 但在后續(xù)處理的時候就把該值丟了, 于是struts只能從struts-config.xml 文件讀取, 而不是從struts-config-admin.xml中讀取action, 所有就找不到了action, 拋出異常.
?
? struts 1.2 我還有待測試, 不知道是否有同樣的問題.?

? 其它相同問題的網(wǎng)友發(fā)言:

??? ?????原文鏈接1：http://www.aygfsteel.com/shaofan/archive/2006/03/01/32974.html ????
????????? 原文鏈接2：http://202.100.72.44/news/itschool/pro/pro44134.htm

? DispatchAction 必須不寫execute(... ...)方法, 否則反而有問題, 使用中我發(fā)現(xiàn)如果你寫了exceute 方法 struts仍然首先調(diào)用改excute()方法, 這是即使你配置了 method 參數(shù)如 action="abcAction.do?method=load" 也無效, struts 仍然首先執(zhí)行execute, 故DispatchAction中不要寫execute( ... ...) 方法.?

?? jsp 頁面提交以后, actionservlet根據(jù)配置文件struts-config.xml 中action 的配置,? 首先到 reqest 或session 中查找對應(yīng)的form(action 的attribute 即為form 對象的名稱)對象是否存在, 如果不存在, 首先new 一個form對象.

??? 然后調(diào)用reset方法設(shè)置該form對象的屬性;
??? 再從jsp頁面取得屬性并set bean的屬性,
??? 然后再調(diào)用validate方法(validate = true),驗證出錯, 則直接返回到input 頁面,正確則調(diào)用action的方法進(jìn)行出來.
??