事实上我们依然可以通过程序将Excel写出来，事实上开始我确实也是这么做了，但是在做的过程中发现，要手写代码生成这种几十行的Excel实在是一个很大的工作量，尤其是对样式的控制更是繁琐；而且用程序生拼单元格生成Sheet不能正常打印到A4纸中，最后果断放弃，事实证明这个选择是正确的！
好吧，说了这么多总算进入正题，最后我选择了通过程序Copy整个Sheet的方式，采用通过这种实现方式，我只需要相关人员给我提供设置好模版，在批量生成的时候先通过Copy的方式生成新的Sheet，然后在向指定的Sheet中填写相关数据即可，而且当模版发生变化时只需调整Sheet中写值的代码即可！
重点是两个方法：copySheet和copyRow,主要代码如下：
package org.pihai.utils.excel.poi;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFPrintSetup;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.Region;
/**
* POI操作Excel
* @since: 1.0
* @version:1.0
* @createTime:2011年05月21日 16：12：15
* @updateTime:2011年07月21日 10：47：20
* @author niejy [email protected]
*/
public class PoiExcelSheetCopy {
/**
* 根据源Sheet样式copy新Sheet
* @param fromsheetname
* @param newsheetname
* @param targetFile
*/
public void copySheet(String fromsheetname, String newsheetname,String targetFile) {
HSSFWorkbook wb = null;
try {
FileInputStream fis = new FileInputStream(targetFile);
wb = new HSSFWorkbook(fis);
HSSFSheet fromsheet = wb.getSheet(fromsheetname);
if (fromsheet != null && wb.getSheet(newsheetname) == null) {
HSSFSheet newsheet = wb.createSheet(newsheetname);
//设置打印参数
newsheet.setMargin(HSSFSheet.TopMargin,fromsheet.getMargin(HSSFSheet.TopMargin));// 页边距（上）
newsheet.setMargin(HSSFSheet.BottomMargin,fromsheet.getMargin(HSSFSheet.BottomMargin));// 页边距（下）
newsheet.setMargin(HSSFSheet.LeftMargin,fromsheet.getMargin(HSSFSheet.LeftMargin) );// 页边距（左）
newsheet.setMargin(HSSFSheet.RightMargin,fromsheet.getMargin(HSSFSheet.RightMargin));// 页边距（右
HSSFPrintSetup ps = newsheet.getPrintSetup();
ps.setLandscape(false); // 打印方向，true：横向，false：纵向(默认)
ps.setVResolution((short)600);
ps.setPaperSize(HSSFPrintSetup.A4_PAPERSIZE); //纸张类型
File file = new File(targetFile);
if (file.exists() && (file.renameTo(file))) {
copyRows(wb, fromsheet, newsheet, fromsheet.getFirstRowNum(), fromsheet.getLastRowNum());
FileOutputStream fileOut = new FileOutputStream(targetFile);
wb.write(fileOut);
fileOut.flush();
fileOut.close();
} else {
System.out.println(“文件不存在或者正在使用,请确认…”);
}
}
fis.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 拷贝Excel行
* @param wb
* @param fromsheet
* @param newsheet
* @param firstrow
* @param lastrow
*/
public void copyRows(HSSFWorkbook wb, HSSFSheet fromsheet,HSSFSheet newsheet, int firstrow, int lastrow) {
if ((firstrow == -1) || (lastrow == -1) || lastrow < firstrow) {
return;
}
// 拷贝合并的单元格
Region region = null;
for (int i = 0; i < fromsheet.getNumMergedRegions(); i++) {
region = fromsheet.getMergedRegionAt(i);
if ((region.getRowFrom() >= firstrow)&& (region.getRowTo() <= lastrow)) {
newsheet.addMergedRegion(region);
}
}
HSSFRow fromRow = null;
HSSFRow newRow = null;
HSSFCell newCell = null;
HSSFCell fromCell = null;
// 设置列宽
for (int i = firstrow; i <= lastrow; i++) {
fromRow = fromsheet.getRow(i);
if (fromRow != null) {
for (int j = fromRow.getLastCellNum(); j >= fromRow.getFirstCellNum(); j–) {
int colnum = fromsheet.getColumnWidth((short) j);
if (colnum > 100) {
newsheet.setColumnWidth((short) j, (short) colnum);
}
if (colnum == 0) {
newsheet.setColumnHidden((short) j, true);
} else {
newsheet.setColumnHidden((short) j, false);
}
}
break;
}
}
// 拷贝行并填充数据
for (int i = 0; i <= lastrow; i++) {
fromRow = fromsheet.getRow(i);
if (fromRow == null) {
continue;
}
newRow = newsheet.createRow(i – firstrow);
newRow.setHeight(fromRow.getHeight());
for (int j = fromRow.getFirstCellNum(); j < fromRow.getPhysicalNumberOfCells(); j++) {
fromCell = fromRow.getCell((short) j);
if (fromCell == null) {
continue;
}
newCell = newRow.createCell((short) j);
newCell.setCellStyle(fromCell.getCellStyle());
int cType = fromCell.getCellType();
newCell.setCellType(cType);
switch (cType) {
case HSSFCell.CELL_TYPE_STRING:
newCell.setCellValue(fromCell.getRichStringCellValue());
break;
case HSSFCell.CELL_TYPE_NUMERIC:
newCell.setCellValue(fromCell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_FORMULA:
newCell.setCellFormula(fromCell.getCellFormula());
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
newCell.setCellValue(fromCell.getBooleanCellValue());
break;
case HSSFCell.CELL_TYPE_ERROR:
newCell.setCellValue(fromCell.getErrorCellValue());
break;
default:
newCell.setCellValue(fromCell.getRichStringCellValue());
break;
}
}
}
}
public static void main(String[] args) {
PoiExcelSheetCopy ew = new PoiExcelSheetCopy();
ew.copySheet(“template”, “test2″, “d:/template.xls”);
}
}
转自：http://www.pihai.me/archives/882.html#header