在下面的代码中，我从excel电子表格中流式传输数据并对其进行分组，我的问题是如何将每个分组流导出到Excel文件？
package excelgroupdata;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Iterator;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ExcelGroupData {
public static void main(String args[]) throws Exception
{
//create a input stream for your excel file from which data will be read.
FileInputStream excelSheetInput = new FileInputStream("C:/test1.xlsx");
//POIFSFileSystem myFileSystem = new POIFSFileSystem(excelSheetInput);
XSSFWorkbook myWorkBook = new XSSFWorkbook(excelSheetInput);
//get first work sheet in your excel file.
Sheet sheet = myWorkBook.getSheetAt(0);
//we will read data in first rows(0) second column(1)
Iterator<Row> rowIterator = sheet.iterator();
Row myRow = sheet.getRow(1);
Cell myCell= myRow.getCell(0);
Iterator<Cell> cellIterator ;
String firstCell = myCell.getStringCellValue();
int count =1;
String nextCell;
String Matter = "Matter Number: "+firstCell;
System.out.println(Matter);
while(rowIterator.hasNext())
{
myRow = sheet.getRow(count);
cellIterator = myRow.cellIterator();
myCell= myRow.getCell(0);
nextCell= myCell.getStringCellValue();
if(nextCell.equals(firstCell))
{
while(cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch(cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
System.out.print(cell.getBooleanCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_NUMERIC:
cell.setCellType(Cell.CELL_TYPE_STRING);
System.out.print(cell.getStringCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue() + "\t\t");
break;
}
}
System.out.println();
count++;
}
else
{
myRow = sheet.getRow(count);
myCell= myRow.getCell(0);
nextCell=myCell.getStringCellValue();
firstCell=nextCell;
Matter = "Matter Number: "+firstCell;
System.out.println(Matter);
}
}
}
}
我知道有一些错误编码的元素，但目前并不关心，一般的想法是有效的。
这里是我输入的数据以及分组输出的外观：
Matter Number: A4041222
A4041222 Sihlaba 2011/09/16 2013/09/15 2012/11/20
Matter Number: A4041231
A4041231 Gwavu 2011/09/26 2013/09/26 2012/11/22
Matter Number: A4041260
A4041260 Lin 2011/11/21 2013/11/20 2012/11/29
A4041260 Lin 2011/09/16 2013/09/15 2012/11/29
Matter Number: A4041281
A4041281 Sharma 2011/09/16 2013/09/15 2013/01/21
Matter Number: A4041336
A4041336 Nkwankwana 2011/09/16 2013/09/15 2013/01/21
A4041336 Nkwankwana 2011/09/16 2013/09/15 2013/01/21
Matter Number: A4041420
A4041420 Gqozo 2011/09/22 2013/09/21 2012/07/18
A4041420 Gqozo 2011/09/22 2013/09/21 2012/07/20
Matter Number: A4041494
A4041494 Henneberry 2011/09/21 2013/09/20 2013/01/21
Matter Number: A4041522
A4041522 Monepya 2011/09/16 2013/09/15 2013/01/21
Matter Number: A4041600
A4041600 Vezi 2011/09/16 2013/09/15 2012/12/13
Matter Number: A4041640
A4041640 Cupido 2011/09/27 2013/09/26 2012/09/25
A4041640 Cupido 2011/09/26 2013/09/25 2012/11/27
Matter Number: A4041644
A4041644 Mfingwana 2011/09/27 2013/09/26 2013/01/21
A4041644 Mfingwana 2011/09/27 2013/09/27 2013/01/21
Matter Number: A4041665
A4041665 Mafura 2011/09/29 2013/09/28 2012/12/13
Matter Number: A4041770
A4041770 Mlangeni 2011/09/17 2013/09/16 2012/10/12
Matter Number: A4041965
A4041965 Vukeya 2011/09/17 2013/09/17 2012/11/22
Matter Number: A4042005
A4042005 Tayerera 2011/09/17 2013/09/16 2012/11/27
A4042005 Tayerera 2011/11/11 2013/11/10 2012/11/27
A4042005 Tayerera 2011/11/11 2013/11/10 2012/11/27
A4042005 Tayerera 2011/09/17 2013/09/16 2012/11/27
Matter Number: A4042029
A4042029 Wallace 2011/09/17 2013/09/16 2013/01/21
Matter Number: A4042188
A4042188 Khoza 2011/10/04 2013/10/04 2012/04/04
Matter Number: A4042212
A4042212 Gocini 2011/09/30 2013/09/29 2012/10/29
答案 0 :(得分：1)
The tutorials contain examples如何使用POI创建Excel文件。对于您的情况，从“时间表”演示开始，它可能最接近您的需要。
答案 1 :(得分：1)
我编辑了我的代码，如下所示：
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.util.Iterator;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ExcelGroupData {
public static void main(String args[]) throws Exception
{
//create a input stream for your excel file from which data will be read.
FileInputStream excelSheetInput = new FileInputStream("C:/book2.xlsx");
//POIFSFileSystem myFileSystem = new POIFSFileSystem(excelSheetInput);
XSSFWorkbook myWorkBook = new XSSFWorkbook(excelSheetInput);
//get first work sheet in your excel file.
Sheet sheet = myWorkBook.getSheetAt(0);
//we will read data in first rows(0) second column(1)
Iterator<Row> rowIterator = sheet.iterator();
Row myRow = sheet.getRow(1);
Cell myCell= myRow.getCell(0);
Iterator<Cell> cellIterator ;
String firstCell = myCell.getStringCellValue();
int count =1;
String nextCell;
String Matter = "Matter Number: "+firstCell;
String num = firstCell;
System.out.println(Matter);
FileWriter fWriter = null;
BufferedWriter writer = null;
fWriter = new FileWriter(num+".txt");
writer = new BufferedWriter(fWriter);
writer.write(Matter);
writer.newLine();
while(rowIterator.hasNext())
{
myRow = sheet.getRow(count);
cellIterator = myRow.cellIterator();
myCell= myRow.getCell(0);
nextCell= myCell.getStringCellValue();
if(nextCell.equals(firstCell))
{
while(cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch(cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
System.out.print(cell.getBooleanCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_NUMERIC:
cell.setCellType(Cell.CELL_TYPE_STRING);
System.out.print(cell.getStringCellValue() + "\t\t");
writer.write(cell.getStringCellValue()+ "\t");
break;
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue() + "\t\t");
writer.write(cell.getStringCellValue()+ "\t");
break;
}
}
System.out.println();
writer.newLine();
count++;
}
else
{
writer.close();
myRow = sheet.getRow(count);
myCell= myRow.getCell(0);
nextCell=myCell.getStringCellValue();
firstCell=nextCell;
Matter = "Matter Number: "+firstCell;
num = firstCell;
System.out.println(Matter);
fWriter = new FileWriter(num+".txt");
writer = new BufferedWriter(fWriter);
writer.write(Matter);
writer.newLine();
}
}
}
}
现在将每个组写入文本文件，但是它没有将最后一个组写入文本文件，但一般概念就在那里。