嘗試讀取單元格時發生奇怪的越界異常

Question

我一直在嘗試讀取Excel表格並將單元格中的數據插入到程序中。我很成功，但是當我嘗試從位置4及以後的單元格獲取數據時，我遇到了一個越​​界異常。不知道爲什麼會這樣，因爲我可以稱呼位置0,1,2和3就好。這是我的代碼。

public void readExcel(File file) { 

try { 

//Workbook newBook = new Workbook(); 
Workbook workbook = Workbook.getWorkbook(file); 
WritableWorkbook workbookOutput = Workbook.createWorkbook(new File("output.xls")); 
// Workbook workbook = Workbook.getWorkbook(new File(「Res.xls」)); 
WritableSheet sheetOutput = workbookOutput.createSheet("First Sheet", 0); 


sheet = workbook.getSheet(0); 
boolean isnotnull = true; 
int i = 0; 
while(isnotnull){ 

    //Cell a1 = sheet.getCell(0, 2); 
try{ 
    Cell a2 = sheet.getCell(0, i); 
    Cell a3 = sheet.getCell(1, i); 
    Cell a4 = sheet.getCell(2, i); 
    stringa1 = a2.getContents(); 
    stringa2 = a3.getContents(); 
    stringa3 = a4.getContents(); 

    char c = stringa2.charAt(0); 
    char d = stringa2.charAt(1); 

    if(Character.isDigit(c) || Character.isDigit(d)){ 
     System.out.println("found one"); 
     stringa1 = stringa1 + "" + stringa2; 
     stringa2 = stringa3; 
     Cell a5 = sheet.getCell(3, i); 
     try{ 
      Cell a10 = sheet.getCell(4, i); 
      // System.out.print("Cell" + a6.getContents()); 
     } 
     catch(Exception e){ 
      System.out.println(e); 
     } 

     stringa4 = a5.getContents(); 
     stringa3 = stringa4; 
     // checkCells(1, i); 

    } 
    Label label = new Label(0, i, stringa1); 
    Label label2 = new Label(1, i, stringa2); 
    Label label3 = new Label(2, i, stringa3); 
    sheetOutput.addCell(label); 
    sheetOutput.addCell(label2); 
    sheetOutput.addCell(label3); 
    i++; 
    System.out.println(stringa1 + " |||||||||||| " + stringa2 + " |||||||| " + stringa3 + " " + i); 
}catch(Exception e){ 
    System.out.println(e); 
    isnotnull = false; 
} 

} 

workbookOutput.write(); 
try{ 
workbookOutput.close(); 
}catch(Exception r){ 
    System.out.println(r); 
} 
System.out.println(stringa1); 

workbook.close(); 

} catch (BiffException e) { 

e.printStackTrace(); 

} catch (IOException e) { 

    e.printStackTrace(); 

} 

}`enter code here` 

Answer 1

此單元格根本不存在於電子表格中。看來createSheet方法只創建少數第一個單元格。