记录开发过程用的代码段001--POI生成excel表格，如何合并单元格

POI生成excel表格，如何合并单元格

import java.io.FileOutputStream;
import java.io.IOException;

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

public class ExcelTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws IOException {

		try {
			HSSFWorkbook wb = new HSSFWorkbook();
			HSSFSheet sheet = wb.createSheet("new   sheet");
			HSSFCellStyle style = wb.createCellStyle(); // 样式对象

			style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直
			style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 水平
			HSSFRow row = sheet.createRow((short) 0);
			HSSFRow row2 = sheet.createRow((short) 1);

			sheet.addMergedRegion(new Region(0, (short) 0, 1, (short) 0));
			HSSFCell ce = row.createCell((short) 0);
			ce.setEncoding(HSSFCell.ENCODING_UTF_16);// 中文处理
			ce.setCellValue("项目\\日期"); // 表格的第一行第一列显示的数据
			ce.setCellStyle(style); // 样式，居中
			int num = 0;
			for (int i = 0; i < 9; i++) { // 循环9次，每一次都要跨单元格显示
				// 计算从那个单元格跨到那一格
				int celln = 0;
				int celle = 0;
				if (i == 0) {
					celln = 0;
					celle = 1;
				} else {
					celln = (i * 2);
					celle = (i * 2 + 1);
				}
				// 单元格合并
				// 四个参数分别是：起始行，起始列，结束行，结束列
				sheet.addMergedRegion(new Region(0, (short) (celln + 1), 0,
						(short) (celle + 1)));
				HSSFCell cell = row.createCell((short) (celln + 1));
				cell.setCellValue("merging" + i); // 跨单元格显示的数据
				cell.setCellStyle(style); // 样式
				// 不跨单元格显示的数据，如：分两行，上一行分别两格为一格，下一行就为两格，“数量”，“金额”
				HSSFCell cell1 = row2.createCell((short) celle);
				HSSFCell cell2 = row2.createCell((short) (celle + 1));
				cell1.setEncoding(HSSFCell.ENCODING_UTF_16);
				cell1.setCellValue("数量");
				cell1.setCellStyle(style);
				cell2.setEncoding(HSSFCell.ENCODING_UTF_16);
				cell2.setCellValue("金额");
				cell2.setCellStyle(style);
				num++;
			}

			// 在后面加上合计百分比

			// 合计 在最后加上，还要跨一个单元格
			sheet.addMergedRegion(new Region(0, (short) (2 * num + 1), 0,
					(short) (2 * num + 2)));
			HSSFCell cell = row.createCell((short) (2 * num + 1));
			cell.setEncoding(HSSFCell.ENCODING_UTF_16);
			cell.setCellValue("合计");
			cell.setCellStyle(style);
			HSSFCell cell1 = row2.createCell((short) (2 * num + 1));
			HSSFCell cell2 = row2.createCell((short) (2 * num + 2));
			cell1.setEncoding(HSSFCell.ENCODING_UTF_16);
			cell1.setCellValue("数量");
			cell1.setCellStyle(style);
			cell2.setEncoding(HSSFCell.ENCODING_UTF_16);
			cell2.setCellValue("金额");
			cell2.setCellStyle(style);

			// 百分比 同上
			sheet.addMergedRegion(new Region(0, (short) (2 * num + 3), 0,
					(short) (2 * num + 4)));
			HSSFCell cellb = row.createCell((short) (2 * num + 3));
			cellb.setEncoding(HSSFCell.ENCODING_UTF_16);
			cellb.setCellValue("百分比");
			cellb.setCellStyle(style);
			HSSFCell cellb1 = row2.createCell((short) (2 * num + 3));
			HSSFCell cellb2 = row2.createCell((short) (2 * num + 4));
			cellb1.setEncoding(HSSFCell.ENCODING_UTF_16);
			cellb1.setCellValue("数量");
			cellb1.setCellStyle(style);
			cellb2.setEncoding(HSSFCell.ENCODING_UTF_16);
			cellb2.setCellValue("金额");
			cellb2.setCellStyle(style);

			FileOutputStream fileOut = new FileOutputStream("workbook.xls");
			wb.write(fileOut);
			fileOut.close();
			System.out.print("OK");
		} catch (Exception ex) {
			ex.printStackTrace();
		}

	}

}