我创建了代码，在其中可以通过数据库访问数据，然后将数据写入excel工作表中。
现在数据已成功写入。但是，当将数据写入excel文件第一列的excel工作表中时，问题是。
但是在第二列时，这些行打印在第二列中，从第一列的最后一行开始。
我想并列打印列。请参考这张图片link，以获取更好的理解。请说明一下，这将有助于回答我的问题。为了简化起见，我缩短了代码。
Integer col = 5;
Double sl_counter = 0.0;
Double coff_counter = 0.0;
try {
ConnectionClass cn = new ConnectionClass();
Connection con = cn.connectDb();
String filename = "E:\\export.csv" ;
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("FirstSheet");
HSSFRow leave_count = sheet.createRow((short)4);
while(rs7.next()){
HSSFRow SL = sheet.createRow(col);
SL.createCell(17).setCellValue(rs7.getString("leave_Date"));
col++;
sl_counter++;
}
while(rs11.next()){
HSSFRow SL = sheet.createRow(col);
SL.createCell(17).setCellValue(rs11.getString("leave_Date")+" (FIRST HALF DAY)");
col++;
sl_counter += 0.5;
}
while(rs15.next()){
HSSFRow SL= sheet.createRow(col);
SL.createCell(17).setCellValue(rs15.getString("leave_Date")+" (SECOND HALF DAY)");
col++;
sl_counter += 0.5;
}
leave_count.createCell(17).setCellValue(sl_counter);
//int cols = 5;
while(rs8.next()){
HSSFRow leave_date = sheet.createRow(col);
leave_date.createCell(18).setCellValue(rs8.getString("leave_Date"));
col++;
coff_counter++;
}
while(rs12.next()){
HSSFRow leave_date = sheet.createRow(col);
leave_date.createCell(18).setCellValue(rs12.getString("leave_Date")+" (FIRST HALF DAY)");
col++;
coff_counter += 0.5;
}
while(rs16.next()){
HSSFRow leave_date = sheet.createRow(col);
leave_date.createCell(18).setCellValue(rs16.getString("leave_Date")+" (SECOND HALF DAY)");
col++;
coff_counter += 0.5;
}
leave_count.createCell(18).setCellValue(coff_counter);
FileOutputStream fileOut = new FileOutputStream(filename);
workbook.write(fileOut);
fileOut.close();
// workbook.close();
cl_counter = 0.0;
col = 0;
} catch ( Exception ex ) {
System.out.println(ex);
}
答案 0 :(得分：0)
为了创建新的工作表，您需要第二个对象 HSSFSheet ，并需要对其进行初始化。
我已将URL中的poi jar添加到Access HSSFSheet类。
我已经使用临时数据列表准备了带有HSSF库的演示，因此您可以对如何使用该库通过创建多个工作表来生成excel文件有一个小小的想法。
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public class Excel {
public static void main(String[] args) {
int col = 1;
try {
String filename = "I:\\export.csv";
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("FirstSheet");
List rs7 = new ArrayList();
rs7.add("06/27/2019");
List rs8 = new ArrayList();
rs8.add("06/23/2019");
List rs11 = new ArrayList();
rs11.add("06/23/2019");
List rs12 = new ArrayList();
rs12.add("06/26/2019");
List rs15 = new ArrayList();
rs15.add("06/26/2019");
List rs16 = new ArrayList();
rs16.add("06/25/2019");
int r7,r8, r11,r12, r15,r16;
r7=r8=r11=r12=r15=r16=0;
sheet.createRow(0).createCell(1).setCellValue("SL");
while (r7<rs7.size()) {
HSSFRow SL = sheet.createRow(col++);
SL.createCell(1).setCellValue(""+rs7.get(r7++));
}
while (r11<rs11.size()) {
HSSFRow SL = sheet.createRow(col++);
SL.createCell(1).setCellValue(rs11.get(r11++) + " (FIRST HALF DAY)");
}
while (r15<rs15.size()) {
HSSFRow SL = sheet.createRow(col++);
SL.createCell(1).setCellValue(rs15.get(r15++) + " (SECOND HALF DAY)");
}
HSSFSheet sheet2 = workbook.createSheet("SecondSheet");
sheet2.createRow(0).createCell(1).setCellValue("C-OFF");
col=1;
while (r8<rs8.size()) {
HSSFRow leave_date = sheet2.createRow(col++);
leave_date.createCell(1).setCellValue(""+rs8.get(r8++));
}
while (r12<rs12.size()) {
HSSFRow leave_date = sheet2.createRow(col++);
leave_date.createCell(1).setCellValue(rs12.get(r12++) + " (FIRST HALF DAY)");
}
while (r16<rs16.size()) {
HSSFRow leave_date = sheet2.createRow(col++);
leave_date.createCell(1).setCellValue(rs16.get(r16++) + " (SECOND HALF DAY)");
}
FileOutputStream fileOut = new FileOutputStream(filename);
workbook.write(fileOut);
fileOut.close();
col = 0;
} catch (Exception ex) {
System.out.println(ex);
}
}
}
如果您不需要创建多个工作表并且只需要在一个数据表中显示数据，则可以用下面的代码替换上面的第二部分，以帮助您了解用法。
//HSSFSheet sheet2 = workbook.createSheet("SecondSheet");
sheet.getRow(0).createCell(2).setCellValue("C-OFF");
// sheet2.createRow(0).createCell(1).setCellValue("C-OFF");
col=1;
while (r8<rs8.size()) {
sheet.getRow(col++).createCell(2).setCellValue(""+rs8.get(r8++));
/*HSSFRow leave_date = sheet2.createRow(col++);
leave_date.createCell(1).setCellValue(""+rs8.get(r8++));*/
}
while (r12<rs12.size()) {
sheet.getRow(col++).createCell(2).setCellValue(""+rs12.get(r12++)+ " (FIRST HALF DAY)");
/*HSSFRow leave_date = sheet2.createRow(col++);
leave_date.createCell(1).setCellValue(rs12.get(r12++) + " (FIRST HALF DAY)");*/
}
while (r16<rs16.size()) {
sheet.getRow(col++).createCell(2).setCellValue(""+rs16.get(r16++)+ " (SECOND HALF DAY)");
/*HSSFRow leave_date = sheet2.createRow(col++);
leave_date.createCell(1).setCellValue(rs16.get(r16++) + " (SECOND HALF DAY)");*/
}
FileOutputStream fileOut = new FileOutputStream(filename);
workbook.write(fileOut);
fileOut.close();
col = 0;