靈魂-放水

exception

javax.servlet.ServletException: Cannot retrieve mapping for action /showProLists
	org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:846)
	org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:779)
	org.apache.jsp.apply.showProList_jsp._jspService(showProList_jsp.java:193)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	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:810)
	org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
	org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
起初，懷疑是:struts-config.xml里的action配置錯誤，后來仔細檢查，發現無錯誤，排除此疑！
用到的action：
public class ShowProListAction extends Action {
??? public ActionForward execute(ActionMapping mapping,
???????????????????????????????? ActionForm actionForm,
??????????????????????????????? HttpServletRequest request,
???????????????????????????????? HttpServletResponse Response) {
????? // ShowProListForm form = (ShowProListForm)actionForm;
?????? 
?????? String temp=request.getParameter("testSecID");
?????? int ID=Integer.parseInt(temp);
?????? System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"+ID);
?????? ShowProListDAO prolistDAO=new ShowProListDAO();

?????? ArrayList arr=new ArrayList();
?????? arr=prolistDAO.getProList(ID);
?????? if(arr==null){
?????????? return mapping.findForward("null");
?????? }
?????? if(arr !=null){
?????????? if(arr.size()==0){
?????????????? return mapping.findForward("null");
?????????? }
?????????? else{
?????????????? request.setAttribute("showProList",arr);
?????????????? request.setAttribute("stationID",temp);

?????????????? ArrayList proList=(ArrayList)request.getAttribute("showProList");
?????????????? for(int i=0;i<proList.size();i++){
?????????????? ShowProList projects=(ShowProList)proList.get(i);
?????????????? System.out.println(projects.getProjectName());
?????????????? }
?????????????? System.out.println(temp);

?????????????? return mapping.findForward("success");
?????????? }
?????? }
return mapping.findForward("fail");
??? }
}
System.out.println(temp)和System.out.println(projects.getProjectName());
均正常輸出。懷疑，return mapping.findForward("success")懷疑這一步跳轉錯誤？
修改過若干遍struts-config.xml文件，依舊未果！！！！！




最后，dxian來幫忙檢查，發現實際上，該action類，完全通過了。是在跳轉到下個jsp頁面后，jsp頁面里有一表單form：
部分代碼如下：
<html:form action="showProLists" method="post">showProListAction.do
<br><br>
<%
ArrayList proList=(ArrayList)request.getAttribute("showProList");
%>
因為，剛開始寫該jsp頁面時，是copy了一個過來直接改的，忘記把里的form去掉！結果，發生了錯誤！
至此，該問題解決！先前都沒遇到過這個情況，花了好多時間在這個上面。
末了，要感謝下幫過我無數次的 dxian：）