Java 在Struts JSP中迭代的映射元素上测试条件

我是struts新手，正在使用Struts1.x

地图已经被迭代了，我只需要添加一个

标记以检查map的属性是否正确，比如说

map.isGood=true

我做到了：

<c:if test=${map.isGood}>  <!--do stuff--> </c:if>

---

我认为

map

变量具有值（根据我对Struts的了解很少），但它不是。这只是一个条目。我必须做：

---

map.value['isGood']

并按预期工作。

它引发了异常？也许。。。张贴stacktrace会很有帮助。但是如果

map

是一个实际的map，那么上面可能没有

isGood

属性。我正在扩展动作类中设置这个属性

${map.isGood}

是我的想法，我不知道从

map

获取名为

isGood

的属性并在

中使用它的实际语法。如果它是映射中对象的属性，那么应该在该对象上调用它，而不是映射本身。如果它是动作的属性，那么你根本不需要地图。但我们都只是猜测，因为您既不包括异常也不包括所讨论的数据结构。我添加了数据结构详细信息，在关闭旧的堆栈跟踪时需要一些时间，而获取新的堆栈跟踪（构建）需要时间。

map

在

fullMap

中，

fullMap

是一个请求属性。@DaveNewton我现在也添加了堆栈跟踪。

<logic:iterate id="fullMap" name="fullMap" scope="request">
      <bean:define id="map" name="map" scope="page" toScope="request" />

[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)