为fileDownload生成PDF的调用方法

Question

我需要你的帮助来解决在iText jar中找不到类com/lowagie/text/Document的问题。Primefaces的版本是5.0,iText的版本是2.1.7。当我在actionListner中添加方法名称以调用它以从方法生成PDF文件并使其在单击命令按钮时可下载时，会产生错误。

我真的删除了所有的jar并一个接一个地添加它们，但问题仍然是一样的。所有的jar都是唯一的，我使用的是Jdeveloper。

Bean代码是:

public void createPdf1() {
    com.lowagie.text.Document doc = new com.lowagie.text.Document(PageSize.A4, 50, 50, 50, 50);
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ByteArrayInputStream in ;
    try {
        PdfWriter writer;
        writer = PdfWriter.getInstance(doc, out);
        doc.open();
        PdfPTable table = new PdfPTable(1);
        PdfPCell cell = new PdfPCell(new Phrase("First PDF"));
        cell.setBorder(Rectangle.NO_BORDER);
        cell.setRunDirection(PdfWriter.RUN_DIRECTION_LTR);
        table.addCell(cell);
        doc.add(table);
        in = new ByteArrayInputStream(out.toByteArray());
        file = new DefaultStreamedContent(in, "application/pdf", "xxx.pdf");
        System.out.println("INSIDE");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

jsf代码是我所遵循的展示:

<p:commandButton value="Download" ajax="false" onclick="PrimeFaces.monitorDownload(start, stop);" icon="ui-icon-arrowthick-1-s" actionListner="#{pdf.createPdf1}">
    <p:fileDownload value="#{pdf.file}" />
</p:commandButton>

在单击命令按钮时，我得到错误:

javax.faces.el。EvaluationException: java.lang.NoClassDefFoundError:com/lowagie/text/Document在javax.faces.component.MethodBindingMethodExpressionAdapter.invoke (MethodBindingMethodExpressionAdapter.java: 102)在com.sun.faces.application.ActionListenerImpl.processAction (ActionListenerImpl.java: 102)(uiccommand .java:315javax.faces.component.UIViewRoot.broadcastEvents (UIViewRoot.java: 787)在javax.faces.component.UIViewRoot.processApplication (UIViewRoot.java: 1252)在oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._invokeApplication (LifecycleImpl.java: 973)在oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase (LifecycleImpl.java: 354)在oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute (LifecycleImpl.java: 202)javax.faces.webapp.FacesServlet.service (FacesServlet.java: 508)产生原因:java.lang.ClassNotFoundException: com.lowagie.text.Document在weblogic.utils.classloaders.GenericClassLoader.findLocalClass (GenericClassLoader.java: 297)在weblogic.utils.classloaders.GenericClassLoader.findClass (GenericClassLoader.java: 270)在weblogic.utils.classloaders.ChangeAwareClassLoader.findClass (ChangeAwareClassLoader.java: 64)在java.lang.ClassLoader.loadClass(ClassLoader.java:305java.lang.ClassLoader.loadClass (ClassLoader.java: 246)weblogic.utils.classloaders.GenericClassLoader.loadClass (GenericClassLoader.java: 179)在weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass (ChangeAwareClassLoader.java: 43)

Answer 1

iText WAR文件保存在/lib文件夹下，它工作得很好。兼容的版本是iText 2.1.7，请参考指南中的依赖项。