使用 primefaces 2.0 从数据表导出数据

Question

我有一个页面，将一些数据加载到数据表中，并提供三个按钮用于导出到 pdf、xls 和 csv。我使用了 Primefaces 在其网页中相同的示例代码：

<h:commandLink>  
   <p:graphicImage value="../resources/images/Excel.png" />  
   <p:dataExporter type="xls" target="grdAudit" fileName="ApplicationLog" />  
</h:commandLink> 

当我单击 commandLink 时，我收到以下异常错误：

java.lang.NoClassDefFoundError: com/lowagie/text/DocumentException
at org.primefaces.component.export.PDFExporter.export(PDFExporter.java:45)
at org.primefaces.component.export.DataExporter.processAction(DataExporter.java:94)
at javax.faces.event.ActionEvent.processListener(ActionEvent.java:84)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:773)
at javax.faces.component.UICommand.broadcast(UICommand.java:296)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:783)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1248)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute 
(InvokeApplicationPhase.java:77)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run
(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet
(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.RequestEventsFilter.doFilter
(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun
(WebAppServletContext.java:3715)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run
(WebAppServletContext.java:3681)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs
(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.internal.WebAppServletContext.securedExecute
(WebAppServletContext.java:2277)
at weblogic.servlet.internal.WebAppServletContext.execute
(WebAppServletContext.java:2183)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
Caused by: java.lang.ClassNotFoundException: com.lowagie.text.DocumentException
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass
(GenericClassLoader.java:297)
at weblogic.utils.classloaders.GenericClassLoader.findClass
(GenericClassLoader.java:270)
at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass
(ChangeAwareClassLoader.java:64)
at java.lang.ClassLoader.loadClass(ClassLoader.java:305)
at java.lang.ClassLoader.loadClass(ClassLoader.java:246)
at weblogic.utils.classloaders.GenericClassLoader.loadClass
(GenericClassLoader.java:179)
at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass
(ChangeAwareClassLoader.java:43)
... 29 more

显然，此类丢失：com.lowagie.text.DocumentException 但我不知道如何获取它，在哪里安装它以及为什么会出现错误。有什么想法吗？

Answer 1

首先，primefaces 2.2.1 的用户指南第 12 页指出，您需要特定版本的 POI 和 iText 库才能导出。下载正确的版本并将其包含在项目中后，导出应该可以进行。

Answer 2

• iText-2.1.5.jar
• poi-bin-3.7-20101029.zip

下载这两个文件并将其导入到您的项目中，它将解决您的错误。