如何为使用WorkbookFactory创建的工作簿创建CellStyle？

Question

I am working on a java code where I have to compare two excel sheets regardless of the format ( xls or xlsx) and copy the rows that differ to a new excel sheet. Then I read about WorkbookFactory which would accept both format. Below is the code snippet I created : Please help!!

    import org.apache.poi.ss.usermodel.Workbook;
    import org.apache.poi.ss.usermodel.WorkbookFactory;
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    import org.apache.poi.ss.usermodel.CellStyle;
    import org.apache.poi.ss.usermodel.IndexedColors;

    class Compare extends CopyRow
    {   
     //<-------VARIABLES DECLARATION & INITIALISATION----->

      Workbook outputWorkbook,workbook1,workbook2;
 Sheet excel1Sheet,excel2Sheet,newSheet;

       public void compare(String fileA,String fileB)

         {
    try
    {
      if(fileA.endsWith(".xls")outputWorkbook = new XSSFWorkbook(new FileInputStream("C:/Documents and Settings/eclipse/workspace/CompareExcelV2/output.xls"));
else
outputWorkbook = new XSSFWorkbook(new FileInputStream("C:/Documents and Settings/eclipse/workspace/CompareExcelV2/output.xlsx"))
      workbook1 = WorkbookFactory.create(new File(fileA));
      workbook2 = WorkbookFactory.create(new File(fileB));

      CellStyle excel1Red = new workbook1.createCellStyle(); **//ERROR HERE**
 CellStyle excel2Green = new workbook2.createCellStyle(); **//ERROR HERE**
      CellStyle newStyle = new outputWorkbook.createCellStyle();**//ERROR HERE**

     }
   catch {}

}

I am not able to create CellStyle. I get the following error:

workbook1 cannot be resolved to a type

workbook2 cannot be resolved to a type

outputWorkbook cannot be resolved to a type

Answer 1

If we take your code:

if(fileA.endsWith(".xls")outputWorkbook = new XSSFWorkbook(new FileInputStream("C:/Documents and Settings/eclipse/workspace/CompareExcelV2/output.xls"));
else outputWorkbook = new XSSFWorkbook(new FileInputStream("C:/Documents and Settings/eclipse/workspace/CompareExcelV2/output.xlsx"))
workbook1 = WorkbookFactory.create(new File(fileA));
workbook2 = WorkbookFactory.create(new File(fileB));

Then there's a few things. One is that opening from a File is lower memory than from a stream , the second is that your code doesn't seem to be doing what you want. You appear to be opening outputWorkbook based on a file, when I suspect you just want a new empty one that you later save. Instead, how about something like:

final String path = "C:/Documents and Settings/eclipse/workspace/CompareExcelV2/";
Workbook outputWorkbook;
FileOutputStream outputTo;
if (fileA.endsWith(".xls") {
   outputWorkbook = new HSSFWorkbook();
   outputTo = new FileOutputStream(path + "output.xls");
} else {
   outputWorkbook = new XSSFWorkbook();
   outputTo = new FileOutputStream(path + "output.xlsx");
}
Workbook workbook1 = WorkbookFactory.create(new File(fileA));
Workbook workbook2 = WorkbookFactory.create(new File(fileB));

Finally, make sure you have all the right jars on your classpath, see the Components and their Dependencies section on the POI website for details