與SXSSFWorkbook

Question

創建groupRows閱讀https://poi.apache.org/apidocs/org/apache/poi/xssf/streaming/SXSSFSheet.html#groupRow(int,%20int)

它說，集團應當窗口大小內創建，但如何創建立交橋窗口大小

Answer 1

這個小例子，產生從第2行一個groupRow到行554組帶200

public static final int ROWS=1000; 
public static final int WINDOW_SIZE=100; 
//public static final int WINDOW_SIZE=1000; 

public static void main(String args[]) throws FileNotFoundException, IOException{ 
    File outputFile = new File("testFile-actual.xlsx"); 
    SXSSFWorkbook sworkbook = new SXSSFWorkbook(WINDOW_SIZE); 
    creatXLSX(outputFile, sworkbook); 

    File expectedoutputFile = new File("testFile-expected.xlsx"); 
    XSSFWorkbook workbook = new XSSFWorkbook(); 
    creatXLSX(expectedoutputFile, workbook); 
} 

private static void creatXLSX(File outputFile, Workbook workbook) 
    throws IOException, FileNotFoundException { 
    Sheet sheet = workbook.createSheet(); 
    int posFirstRow = 1; 
    boolean addgroup = true; 
    for(int i = 0; i < ROWS; i++) { 
     Row row = sheet.createRow(i); 
     Cell cell = row.createCell(0); 
     cell.setCellValue(i); 
     if (addgroup && i % WINDOW_SIZE == 0) { 
      sheet.groupRow(posFirstRow, i); 
      posFirstRow = i+1; 
     } 
     if (i == 556) { 
      sheet.groupRow(posFirstRow, 553); 
      posFirstRow = 556; 
      addgroup = false; 
     } 
    } 
    workbook.write(new FileOutputStream(outputFile)); 
} 

鍵的窗口大小練成的1000行是：

groupRow(1,n) 
groupRow(n+1, m) 

連接兩組，產生相同

groupRow(1,m) 

更多的信息在這裏https://bz.apache.org/bugzilla/show_bug.cgi?id=58077