0
我是struts的新手，並且正在使用（必須保留它）Struts 1.x.在Struts中迭代的Map元素上測試一個條件JSP
地圖已經被遍歷，我只需要添加一個
<c:if>標籤來檢查，如果地圖的特性，讓我們說map.isGood = true。
我所做的：
<c:if test=${map.isGood}> <!--do stuff--> </c:if>
但它引發了異常。這是如何定義地圖：
我該怎麼做我想要的，任何人都可以請幫忙？
編輯：
的fullMap是地圖上的地圖。鍵是字符串，值是另一個映射。 map是一個簡單的HashMap<String, String>。
堆棧跟蹤：
[2017-05-04 13:11:52,352] ERROR ContainerBase - Servlet.service() for servlet jsp threw exception
javax.servlet.jsp.JspException: An error occurred while evaluating custom action attribute "test" with value "${map.isGood}": Unable to find a value for "isGood" in object of class "java.util.TreeMap$Entry" using operator "." (null)
at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:131)
at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:151)
at org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.evaluate(ExpressionEvaluatorManager.java:97)
at org.apache.taglibs.standard.tag.el.core.IfTag.condition(IfTag.java:80)
at javax.servlet.jsp.jstl.core.ConditionalTagSupport.doStartTag(ConditionalTagSupport.java:106)
at org.apache.jsp.fragments.mapList_jsp._jspx_meth_c_005fif_005f1(mapList_jsp.java:830)
at org.apache.jsp.fragments.mapList_jsp._jspx_meth_c_005fif_005f0(mapList_jsp.java:715)
at org.apache.jsp.fragments.mapList_jsp._jspx_meth_logic_005fpresent_005f1(mapList_jsp.java:473)
at org.apache.jsp.fragments.mapList_jsp._jspService(mapList_jsp.java:362)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387)
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:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:505)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:614)
at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:99)
at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:135)
at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:760)
at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:892)
at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462)
at org.apache.jsp.layouts.classicLayout_jsp._jspx_meth_tiles_005finsert_005f6(classicLayout_jsp.java:372)
at org.apache.jsp.layouts.classicLayout_jsp._jspService(classicLayout_jsp.java:141)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387)
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:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:469)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:403)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:239)
at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:302)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.brix.web.filter.SecurityFilter.doFilter(SecurityFilter.java:72)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.brix.web.security.BRIXAuthFilter.doFilter(BRIXAuthFilter.java:310)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.brix.web.security.CheckTokenFilter.doFilter(CheckTokenFilter.java:43)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
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:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
它拋出異常？也許......發佈stacktrace會有幫助。但是如果'map'是一張真實的地圖，那麼它可能沒有'isGood'屬性。 –
我在擴展的Action類中設置了這個屬性。 '$ {map.isGood}'是我的想法，我不知道從'map'獲取名爲'isGood'的屬性的實際語法，並在'' –
nullpointer
中使用它'如果它屬於一個對象*在地圖中，那麼你應該在該對象上調用它，而不是地圖本身。如果它是* action *上的一個屬性，那麼根本就不需要地圖參與。但是我們都只是猜測，因爲你既沒有包括異常，也沒有包含有問題的數據結構。 –