Excel工作表編寫JAVA + POI API

Question

我正在使用以下POI API通過Java代碼在Excel上進行編寫

public static HSSFWorkbook sampleWorkbook = new HSSFWorkbook();
public static HSSFSheet sampleDataSheet = sampleWorkbook.createSheet("ABC");

它正在Excel中創建一個名為ABC的工作表。 沒關系，我的問題是我需要在同一工作簿中添加/創建另一個名為“ XYZ”的工作表。 我怎么做？ 好像我寫這樣的東西

public static HSSFSheet sampleDataSheet = sampleWorkbook.createSheet("XYZ");

它將覆蓋第一個（ABC）。

Answer 1

它不會覆蓋第一個表，它將創建一個新表，但是您需要將其分配給另一個變量：

HSSFSheet firstSheet = sampleWorkbook.createSheet("ABC");
HSSFSheet secondSheet = sampleWorkbook.createSheet("XYZ");

這是文檔 ：

公共XSSFSheet createSheet（java.lang.String sheetname）

為此工作簿創建一個新工作表並返回高級表示。 使用它來創建新的工作表。

Answer 2

為了清楚起見，您可以將相同的變量名稱分配給2個不同的工作表，然后將創建這2個工作表。 但是，這不是一個好習慣，因為您丟失了創建的第一個工作表的句柄。

編碼：

public static HSSFSheet sampleDataSheet = sampleWorkbook.createSheet("ABC");

建議您在類成員部分中創建一個新表。 不建議這樣做， sampleWorkbook可能尚未初始化諸如sampleWorkbook因變量。

用於創建工作表/ Excel文件的方法如下所示：

private void createExcelFile() {
   HSSFWorkbook workbook = new HSSFWorkbook();
   HSSFSheet sampleDataSheet1 = workbook.createSheet("ABC");
   HSSFSheet sampleDataSheet2 = workbook.createSheet("XYZ");
   // save to disk
}

有關更多信息，請參見：

公共HSSFSheet createSheet（）

Answer 3

用Excel寫

public class Writesheet 
{

 public static void main(String[] args) throws Exception 

 {

  //Create blank workbook
  XSSFWorkbook workbook = new XSSFWorkbook(); 
  //Create a blank sheet
  XSSFSheet spreadsheet = workbook.createSheet( 
  " Employee Info ");
  XSSFSheet spreadsheet1 = workbook.createSheet( 
          " Employee Info1 ");
  XSSFSheet spreadsheet2 = workbook.createSheet( 
          " Employee Info2 ");
  XSSFSheet spreadsheet3 = workbook.createSheet( 
          " Employee Info3 ");
  XSSFSheet spreadsheet4 = workbook.createSheet( 
          " Employee Info4 ");
  XSSFSheet spreadsheet5 = workbook.createSheet( 
          " Employee Info5 ");


  XSSFSheet spreadsheet9 = workbook.createSheet( 

  //Create row object
//This data needs to be written (Object[])
  Map < String, Object[] > empinfo =  new TreeMap < String, Object[] >();
  empinfo.put( "1", new Object[] { "EMP ID", "EMP NAME", "DESIGNATION" });
  empinfo.put( "2", new Object[] { "tp1", "Gopal", "Technical Manager" });
  empinfo.put( "3", new Object[] {  "tp2", "Manisha", "Proof Reader" });
  empinfo.put( "4", new Object[] { "tp3", "Masthan", "Technical Writer" });
  empinfo.put( "5", new Object[] {  "tp4", "Satish", "Technical Writer" });
  empinfo.put( "6", new Object[] { "tp5", "Krishna", "Technical Writer" });

  Map < String, Object[] > empinfo1 =  new TreeMap < String, Object[] >();
  empinfo1.put( "1", new Object[] { "tp6", "Gop", "Technical Manager" });
  empinfo1.put( "2", new Object[] {  "tp7", "Mani", "Proof Reader" });
  empinfo1.put( "3", new Object[] { "tp8", "than", "lyricist" });
  empinfo1.put( "4", new Object[] {  "tp9", "Sat", " Writer" });
  empinfo1.put( "5", new Object[] { "tp10", "Krish", "Technical Writer" });

  Map < String, Object[] > empinfo2 =  new TreeMap < String, Object[] >();
  empinfo2.put( "1", new Object[] { "tp11", "nayan", " Manager" });
  empinfo2.put( "2", new Object[] {  "tp12", "priyanka", " developer" });
    empinfo2.put( "3", new Object[] { "tp13", "pradyot", "Technical Writer" });
  empinfo2.put( "4", new Object[] {  "tp14", "manisa", "developer" });
  empinfo2.put( "5", new Object[] { "tp15", "limca", "Technical Writer" });

  //Iterate over data and write to sheet
 func1( spreadsheet,empinfo);

 func1( spreadsheet1,empinfo1);

 func1( spreadsheet2,empinfo2);


 func1( spreadsheet3,empinfo);

 func1( spreadsheet4,empinfo1);

 func1( spreadsheet5,empinfo2);

  //Write the workbook in file system
  FileOutputStream out = new FileOutputStream( 
  new File("Writesheet2.xlsx"));
  workbook.write(out);
  out.close();
  System.out.println( 
  "Writesheet.xlsx written successfully" );
  workbook.close();

  }




 static void func1(XSSFSheet var,Map<String, Object[]> var1)
   {


   XSSFRow row;
Set < String > keyid = var1.keySet();
   int rowid = 0;
   for (String key : keyid)
   {

    row = var.createRow(rowid++);
       Object [] objectArr = var1.get(key);
       int cellid = 0;
       for (Object obj : objectArr)
        {
           Cell cell = row.createCell(cellid++);
           cell.setCellValue((String)obj);
        }
   }
 }

 }