从JTable Java导出到Excel问题

Question

我正在尝试将jTable输出导出到Excel，在路径上创建了输出文件，但是没有我的数据，并且遇到异常，我尝试了很多尝试找到任何有效的代码，但始终会出现差异问题。 请检查下面的代码并给我答案

Exception in thread "AWT-EventQueue-0" java.lang.AbstractMethodError: gnu.xml.dom.DomDocument.getXmlStandalone()Z
at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.setDocumentInfo(DOM2TO.java:377)
at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(DOM2TO.java:131)
at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(DOM2TO.java:98)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:699)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:743)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:357)
at org.apache.poi.openxml4j.opc.StreamHelper.saveXmlInStream(StreamHelper.java:80)
at org.apache.poi.openxml4j.opc.internal.marshallers.ZipPartMarshaller.marshallRelationshipPart(ZipPartMarshaller.java:174)
at org.apache.poi.openxml4j.opc.ZipPackage.saveImpl(ZipPackage.java:464)
at org.apache.poi.openxml4j.opc.OPCPackage.save(OPCPackage.java:1441)
at org.apache.poi.POIXMLDocument.write(POIXMLDocument.java:212)
at newtimesheet.ImpMyWork.jButton7ActionPerformed(ImpMyWork.java:1021)
at newtimesheet.ImpMyWork.access$1900(ImpMyWork.java:44)
at newtimesheet.ImpMyWork$17.actionPerformed(ImpMyWork.java:461)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6525)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6290)
at java.awt.Container.processEvent(Container.java:2234)
at java.awt.Component.dispatchEventImpl(Component.java:4881)
at java.awt.Container.dispatchEventImpl(Container.java:2292)
at java.awt.Component.dispatchEvent(Component.java:4703)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
at java.awt.Container.dispatchEventImpl(Container.java:2278)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4703)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

我正在使用带有以下代码的Apache POI-3.13

private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    Workbook wb = new XSSFWorkbook();
    Sheet sheet = wb.createSheet();
    Row row = sheet.createRow(0);
    TableModel model = jTable1.getModel();
    for (int i = 0; i < model.getColumnCount(); i++) {
        row.createCell(i).setCellValue(model.getColumnName(i));
    }
    for (int i = 0; i < model.getRowCount(); i++) {
        row = sheet.createRow(i + 1);
        for (int j = 0; j < model.getColumnCount(); j++) {
            row.createCell(j).setCellValue(
                    model.getValueAt(i, j).toString()
            );
        }
    }
    FileOutputStream fileOut;
    try {
        fileOut = new FileOutputStream("D:\\filename.xlsx");
        wb.write(fileOut);
        fileOut.close();
    } catch (FileNotFoundException ex) {
        Logger.getLogger(ImpMyWork.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IOException ex) {
        Logger.getLogger(ImpMyWork.class.getName()).log(Level.SEVERE, null, ex);
    }

}

Answer 1

我在这里有两个问题

对于第一个问题，我找到了这个答案

1-这是一种配置问题，是由于您在编译代码时与在运行时在类路径上的代码不同而在类路径上使用了不同的JAR引起的。您可以在此链接中进行检查

异常创建xml文件

并且我曾经使用过一些与Apache POI-3.13库冲突的Java流程图库，所以我将其删除并正常工作

2-您应该替换这些代码行

  row.createCell(j).setCellValue(
  model.getValueAt(i, j).toString()

通过

   if (model.getValueAt(i, j) != null) {
   val = model.getValueAt(i, j).toString();
   } else {
  val = "NULL"; //you can change value to any thing you want to represent null values
          }
   row.createCell(j).setCellValue(val);

避免空指针异常错误

那是因为如果您在数据库中允许空值，则会得到空指针异常