11、设置列自动换行

   HSSFCellStyle cellStyle =  workbook.createCellStyle();
   cellStyle.setWrapText(true);
   sheet.setDefaultColumnStyle((short)0, cellStyle);

    设置列的宽度

   sheet.setColumnWidth((short)0,(short)9000);

 

  sheet.setDefaultColumnStyle((short)0, cellStyle);

  与

  sheet.setDefaultColumnWidth((short)70);冲突

  只会换行 不会设置列宽

单元格拷贝示例：

package testpoi;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import org.apache.poi.hssf.usermodel.HSSFCell;

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;

import org.apache.poi.poifs.filesystem.POIFSFileSystem;

/**

 * 将某SHEET页中的某几行复制到某SHEET页的某几行中。抱括被合并了的单元格。

 */

public class RowCopy {

/**

* @param args

* @throws IOException

* @throws FileNotFoundException

*/

@SuppressWarnings("deprecation")

public static void main(String[] args) {

try {

POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(

"d:\\exlsample.xls"));

HSSFWorkbook wb = new HSSFWorkbook(fs);

// source为源sheet 页,target为目标sheet页

copyRows(wb, "source", "target", 5, 6, 20);

FileOutputStream fileOut = new FileOutputStream("d:\\exlsample.xls");

wb.write(fileOut);

fileOut.flush();

fileOut.close();

System.out.println("Operation finished");

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* @param wb HSSFWorkbook

* @param pSourceSheetName 源sheet页名称

* @param pTargetSheetName 目标sheet页名称

* @param pStartRow 源sheet页中的起始行

* @param pEndRow  源sheet页中的结束行

* @param pPosition 目标sheet页中的开始行

*/

public static void copyRows(HSSFWorkbook wb, String pSourceSheetName,

String pTargetSheetName, int intStartRow, int intEndRow, int intPosition) {

// EXECL中的行是从1开始的，而POI中是从0开始的，所以这里要减1.

int pStartRow = intStartRow - 1;

int pEndRow = intEndRow - 1;

int pPosition = intPosition - 1;

HSSFRow sourceRow = null;

HSSFRow targetRow = null;

HSSFCell sourceCell = null;

HSSFCell targetCell = null;

HSSFSheet sourceSheet = null;

HSSFSheet targetSheet = null;

Region region = null;

int cType;

int i;

int j;

int targetRowFrom;

int targetRowTo;

if ((pStartRow == -1) || (pEndRow == -1)) {

return;

}

sourceSheet = wb.getSheet(pSourceSheetName);

targetSheet = wb.getSheet(pTargetSheetName);

System.out.println(sourceSheet.getNumMergedRegions());

// 拷贝合并的单元格

for (i = 0; i < sourceSheet.getNumMergedRegions(); i++) {

region = sourceSheet.getMergedRegionAt(i);

if ((region.getRowFrom() >= pStartRow)

&& (region.getRowTo() <= pEndRow)) {

targetRowFrom = region.getRowFrom() - pStartRow + pPosition;

targetRowTo = region.getRowTo() - pStartRow + pPosition;

region.setRowFrom(targetRowFrom);

region.setRowTo(targetRowTo);

targetSheet.addMergedRegion(region);

}

}

// 设置列宽

for (i = pStartRow; i <= pEndRow; i++) {

sourceRow = sourceSheet.getRow(i);

if (sourceRow != null) {

for (j = sourceRow.getLastCellNum(); j > sourceRow

.getFirstCellNum(); j--) {

targetSheet

.setColumnWidth(j, sourceSheet.getColumnWidth(j));

targetSheet.setColumnHidden(j, false);

}

break;

}

}

// 拷贝行并填充数据

for (; i <= pEndRow; i++) {

sourceRow = sourceSheet.getRow(i);

if (sourceRow == null) {

continue;

}

targetRow = targetSheet.createRow(i - pStartRow + pPosition);

targetRow.setHeight(sourceRow.getHeight());

for (j = sourceRow.getFirstCellNum(); j < sourceRow

.getPhysicalNumberOfCells(); j++) {

sourceCell = sourceRow.getCell(j);

if (sourceCell == null) {

continue;

}

targetCell = targetRow.createCell(j);

targetCell.setCellStyle(sourceCell.getCellStyle());

cType = sourceCell.getCellType();

targetCell.setCellType(cType);

switch (cType) {

case HSSFCell.CELL_TYPE_BOOLEAN:

targetCell.setCellValue(sourceCell.getBooleanCellValue());

System.out.println("--------TYPE_BOOLEAN:"

+ targetCell.getBooleanCellValue());

break;

case HSSFCell.CELL_TYPE_ERROR:

targetCell

.setCellErrorValue(sourceCell.getErrorCellValue());

System.out.println("--------TYPE_ERROR:"

+ targetCell.getErrorCellValue());

break;

case HSSFCell.CELL_TYPE_FORMULA:

// parseFormula这个函数的用途在后面说明

targetCell.setCellFormula(parseFormula(sourceCell

.getCellFormula()));

System.out.println("--------TYPE_FORMULA:"

+ targetCell.getCellFormula());

break;

case HSSFCell.CELL_TYPE_NUMERIC:

targetCell.setCellValue(sourceCell.getNumericCellValue());

System.out.println("--------TYPE_NUMERIC:"

+ targetCell.getNumericCellValue());

break;

case HSSFCell.CELL_TYPE_STRING:

targetCell

.setCellValue(sourceCell.getRichStringCellValue());

System.out.println("--------TYPE_STRING:" + i

+ targetCell.getRichStringCellValue());

break;

}

}

}

}

/**

* POI对Excel公式的支持是相当好的，但是有一个问题，如果公式里面的函数不带参数，比如now()或today()，

* 那么你通过getCellFormula()取出来的值就是now(ATTR(semiVolatile))和today(ATTR(semiVolatile))，

* 这样的值写入Excel是会出错的，这也是我上面copyRow的函数在写入公式前要调用parseFormula的原因，

* parseFormula这个函数的功能很简单，就是把ATTR(semiVolatile)删掉。

* @param pPOIFormula

* @return

*/

private static String parseFormula(String pPOIFormula) {

final String cstReplaceString = "ATTR(semiVolatile)"; //$NON-NLS-1$

StringBuffer result = null;

int index;

result = new StringBuffer();

index = pPOIFormula.indexOf(cstReplaceString);

if (index >= 0) {

result.append(pPOIFormula.substring(0, index));

result.append(pPOIFormula.substring(index

+ cstReplaceString.length()));

} else {

result.append(pPOIFormula);

}

return result.toString();

}

}