如何爲使用WorkbookFactory創建的工作簿創建CellStyle？

我正在研究一個java代碼，我必須比較兩個excel表格，不管格式（xls或xlsx）如何，並複製不同於新Excel表格的行。然後我讀了WorkbookFactory，它可以接受這兩種格式。 下面是我創建的代碼片段：請幫助！如何爲使用WorkbookFactory創建的工作簿創建CellStyle？

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 {}

}

我不能夠創造CellStyle。我得到以下錯誤：

workbook1 cannot be resolved to a type

workbook2 cannot be resolved to a type

outputWorkbook cannot be resolved to a type

來源

2014-06-10 jake295

如果我們把你的代碼：

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));

然後有幾件事情。一個是opening from a File is lower memory than from a stream，第二個是你的代碼似乎沒有做你想做的。你似乎打開outputWorkbook基於一個文件，當我懷疑你只是想要一個新的空的，你以後保存。取而代之的是，怎麼樣是這樣的：

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));

最後，確保你有你的classpath中所有正確的罐子，看the Components and their Dependencies section的POI網站上的詳細信息

來源

2014-06-10 11:19:54 Gagravarr

感謝您的幫助！ @Gagravarr我也發現了CellStyle的問題，我試圖使用（我的壞）'excel1Red = new workbook1.createCellStyle（）;來初始化CellStyle;'所以編譯器正在尋找一個名爲'workbook1'的構造函數。此外，workbookFactory不能創建一個新的Excel？它只能讀取excel文件？如果是這樣，如果我比較'.xls'和'.xlsx'文件，根據我的代碼，它將創建一個'.xls'輸出文件，因爲它是'fileA'，所以在將輸出寫入輸出文件，因爲'fileB'。請賜教，我是Java和Apache POI的新手。提前致謝。 – jake295

'WorkbookFactory'根據給定的輸入創建適當類型的工作簿，使您無需檢查。對於輸出來說，如果你從一個新文件開始，只有你知道你想要什麼類型，所以你可以根據自己的需求/要求初始化一個適當的'HSSFWorkbook'或'XSSFWorkbook' – Gagravarr

如何爲使用WorkbookFactory創建的工作簿創建CellStyle？

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