我在使用Java中的iText创建Excel报表时遇到了一些问题。我想从数据库中检索包含图像文件的一些数据并将其导出到Excel工作表中，但图像文件不会出现在Excel工作表中。并得到错误：
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/apache/commons/codec/digest/DigestUtils
at org.apache.poi.hssf.usermodel.HSSFWorkbook.addPicture(HSSFWorkbook.java:1705)
at CompInfoTable.ExcelReport(CompInfoTable.java:301)
at CompInfoTable$6.actionPerformed(CompInfoTable.java:748)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.codec.digest.DigestUtils
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 40 more
我用不同的代码尝试了很多次但总是出错。这是我的代码：
public void ExcelReport()
{
try
{
filename="Company Report.xls";
workbook=new HSSFWorkbook();
HSSFSheet sheet=workbook.createSheet("Company Report");
HSSFRow rowhead;
HSSFCell cellhead;
/*-------------------------------Adding A Custom Color ------------------------*/
/* HSSFPalette palette=workbook.getCustomPalette();
palette.setColorAtIndex(new Byte ((byte)41), new Byte ((byte)82), new Byte ((byte)35), new Byte ((byte)85));
style.setFillForegroundColor(palette.getColor(41).getIndex());
/*-------------------------------Adding A Custom Color ------------------------*/
HSSFCellStyle style=workbook.createCellStyle();
style.setBorderBottom(HSSFCellStyle.BORDER_MEDIUM);
style.setBorderLeft(HSSFCellStyle.BORDER_MEDIUM);
style.setBorderRight(HSSFCellStyle.BORDER_MEDIUM);
style.setBorderTop(HSSFCellStyle.BORDER_MEDIUM);
style.setAlignment(CellStyle.ALIGN_CENTER);
style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
style.setFillPattern(CellStyle.SOLID_FOREGROUND);
style.setFillForegroundColor(IndexedColors.DARK_RED.getIndex());
HSSFCellStyle style1=workbook.createCellStyle();
style1.setBorderBottom(HSSFCellStyle.BORDER_MEDIUM);
style1.setBorderLeft(HSSFCellStyle.BORDER_MEDIUM);
style1.setBorderRight(HSSFCellStyle.BORDER_MEDIUM);
style1.setBorderTop(HSSFCellStyle.BORDER_MEDIUM);
style1.setAlignment(CellStyle.ALIGN_CENTER);
style1.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
style1.setFillPattern(CellStyle.SOLID_FOREGROUND);
style1.setFillForegroundColor(IndexedColors.DARK_TEAL.getIndex());
HSSFFont font3=workbook.createFont();
font3.setFontName("Calibri");
font3.setFontHeightInPoints((short)20);
font3.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font3.setItalic(true);
font3.setColor(IndexedColors.WHITE.getIndex());
style.setFont(font3);
HSSFFont font1=workbook.createFont();
font1.setFontName("Calibri");
font1.setFontHeightInPoints((short)18);
font1.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font1.setItalic(true);
font1.setColor(IndexedColors.WHITE.getIndex());
style1.setFont(font1);
HSSFCellStyle style2=workbook.createCellStyle();
style2.setBorderBottom(HSSFCellStyle.BORDER_MEDIUM);
style2.setBorderLeft(HSSFCellStyle.BORDER_MEDIUM);
style2.setBorderRight(HSSFCellStyle.BORDER_MEDIUM);
style2.setBorderTop(HSSFCellStyle.BORDER_MEDIUM);
style2.setAlignment(CellStyle.ALIGN_CENTER);
style2.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
style2.setFillPattern(CellStyle.SOLID_FOREGROUND);
style2.setFillForegroundColor(IndexedColors.SEA_GREEN.getIndex());
HSSFFont font2=workbook.createFont();
font2.setFontName("Calibri");
font2.setFontHeightInPoints((short)14);
font2.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font2.setItalic(true);
font2.setColor(IndexedColors.BLACK.getIndex());
style2.setFont(font2);
rowhead=sheet.createRow(4);
cellhead=rowhead.createCell(0);
cellhead.getRow().setHeightInPoints(30);
CellRangeAddress cellrange=new CellRangeAddress(4,5,0,7);
sheet.addMergedRegion(cellrange);
HSSFRegionUtil.setBorderBottom(CellStyle.BORDER_MEDIUM,cellrange,sheet, workbook);
HSSFRegionUtil.setBorderLeft(CellStyle.BORDER_MEDIUM,cellrange,sheet, workbook);
HSSFRegionUtil.setBorderRight(CellStyle.BORDER_MEDIUM,cellrange,sheet, workbook);
HSSFRegionUtil.setBorderTop(CellStyle.BORDER_MEDIUM,cellrange,sheet, workbook);
cellhead.setCellValue("Company Information");
cellhead.setCellStyle(style);
rowhead=sheet.createRow(8);
cellhead=rowhead.createCell(0);
cellhead.getRow().setHeightInPoints(25);
cellhead.setCellValue("Comp_Name");
cellhead.setCellStyle(style1);
cellhead=rowhead.createCell(1);
cellhead.setCellValue("Comp_Address");
cellhead.setCellStyle(style1);
cellhead=rowhead.createCell(2);
cellhead.setCellValue("Comp_Contact");
cellhead.setCellStyle(style1);
cellhead=rowhead.createCell(3);
cellhead.setCellValue("Comp_Email");
cellhead.setCellStyle(style1);
cellhead=rowhead.createCell(4);
cellhead.setCellValue("Comp_TIN");
cellhead.setCellStyle(style1);
cellhead=rowhead.createCell(5);
cellhead.setCellValue("Comp_ST");
cellhead.setCellStyle(style1);
cellhead=rowhead.createCell(6);
cellhead.setCellValue("Comp_CIN");
cellhead.setCellStyle(style1);
cellhead=rowhead.createCell(7);
cellhead.setCellValue("Comp_Image");
cellhead.setCellStyle(style1);
for(int i=0;i<=7;i++)
{
sheet.setColumnWidth(i,7000);
}
query="Select * from CompanyInfo";
PStat=con.prepareStatement(query);
res=PStat.executeQuery();
int Row=10;
while(res.next())
{
rowhead=sheet.createRow(Row);
cellhead=rowhead.createCell(0);
cellhead.setCellValue(res.getString("Comp_Name"));
cellhead.setCellStyle(style2);
cellhead=rowhead.createCell(1);
cellhead.setCellValue(res.getString("Comp_Address"));
cellhead.setCellStyle(style2);
cellhead=rowhead.createCell(2);
cellhead.setCellValue(res.getString("Comp_Contact"));
cellhead.setCellStyle(style2);
cellhead=rowhead.createCell(3);
cellhead.setCellValue(res.getString("Comp_Email"));
cellhead.setCellStyle(style2);
cellhead=rowhead.createCell(4);
cellhead.setCellValue(res.getString("Comp_TIN"));
cellhead.setCellStyle(style2);
cellhead=rowhead.createCell(5);
cellhead.setCellValue(res.getString("Comp_ST"));
cellhead.setCellStyle(style2);
cellhead=rowhead.createCell(6);
cellhead.setCellValue(res.getString("Comp_CIN"));
cellhead.setCellStyle(style2);
//InputStream is=new FileInputStream((res.getBytes("Comp_Images")).toString());
//byte[] bytes=IOUtils.toByteArray(is);
byte[] bytes=res.getBytes("Comp_Images");
int pics=workbook.addPicture(bytes,HSSFWorkbook.PICTURE_TYPE_JPEG);
//is.close();
CreationHelper helper=workbook.getCreationHelper();
Drawing drawing=sheet.createDrawingPatriarch();
ClientAnchor anchor=helper.createClientAnchor();
anchor.setCol1(7);
anchor.setRow1(Row);
Picture picture=drawing.createPicture(anchor, pics);
picture.resize();
Row++;
}
FileOutputStream fileout=new FileOutputStream(filename);
workbook.write(fileout);
fileout.close();
workbook.close();
JOptionPane.showMessageDialog(null,"Excel file is Generated");
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null,e);
}
}