将会话变量数组列表获取到显示标签中

Question

您好，我从 jsp 中的会话中获取了 ArrayList。

<%java.util.ArrayList<Organisation> OrganisationList1 = 
                    (java.util.ArrayList<DAOrganisation>) 
                   request.getSession().getAttribute("organisationArray");%>

然后我尝试获取此数组列表并使用显示标签进行显示。

<display:table class="displayTable" id="orgList"
                name="OrganisationList" requestURI="" pagesize="13"
                defaultsort="1" sort="list">
                <display:column property="organisationName"
                title="Organisation Name" sortable="true" headerClass="sortable"  paramId="organisationId" paramProperty="organisationId" />
                <display:column property="description" title="Description">
                </display:column>
            </display:table>

但它在显示表中没有显示任何内容。我将分页添加到其他的旧编码中。所以，我需要遵循结构，不能改变它。据我所知，我可以直接将 ArrayList 与 Display Tag 一起使用。因此，我只想使用显示标记显示会话中的数组列表。谢谢。

编辑：在旧代码中，他尝试通过循环转换为Organization Java Bean并用于一一显示。

堆栈跟踪：

org.apache.jasper.JasperException：处理中发生异常 JSP 页面 /organizationlist.jsp 第 81 行

78:79:80:81:82:83:

堆栈跟踪： org.apache.jasper.servlet.JspServletWrapper.handleJspException（JspServletWrapper.java:519） org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:422) 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.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:154) org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186) com.opensymphony.xwork2.DefaultActionInspiration.executeResult(DefaultActionInitation.java:361) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:265) com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:163) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:249) org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:148) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:93) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:128) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.java:104) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:148) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:128) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52) org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:468) org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)

根本原因

java.lang.IllegalStateException：无法访问页面中的会话范围 不参加任何会话 org.apache.jasper.runtime.PageContextImpl.doGetAttribute(PageContextImpl.java:264) org.apache.jasper.runtime.PageContextImpl.getAttribute(PageContextImpl.java:249) org.displaytag.util.LookupUtil.getBeanValue(LookupUtil.java:100) org.displaytag.tags.TemplateTag.evaluateExpression(TemplateTag.java:84) org.displaytag.tags.TableTag.initParameters(TableTag.java:932) org.displaytag.tags.TableTag.doStartTag(TableTag.java:767) org.apache.jsp.organizationlist_jsp._jspService(organizationlist_jsp.java:223) 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:386) 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.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:154) org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186) com.opensymphony.xwork2.DefaultActionInspiration.executeResult(DefaultActionInitation.java:361) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:265) com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:163) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:249) org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:148) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:93) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:128) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.java:104) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:148) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:128) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176) com.opensymphony.xwork2.DefaultActionInitation.invoke(DefaultActionInvocau.java:236) org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52) org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:468) org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)

Answer 1

JSP 标记不使用 scriptlet 变量。他们使用 JSP EL 表达式。 scriptlet 是过去的东西，不应该再在 JSP 中使用。

只需使用Or：

<display:table name="${organisationArray}" ...>

如果你想更明确，

<display:table name="${sessionScope.organisationArray}" ...>