POI进行跨行需要用到对象HSSFSheet对象,现在就当我们程序已经定义了一个HSSFSheet对象sheet。
跨第1行第1个到第2个单元格的操作为
sheet.addMergedRegion(new Region(0,(short)0,0,(short)1));
跨第1行第1个到第2行第1个单元格的操作为
sheet.addMergedRegion(new Region(0,(short)0,1,(short)0));
重点注意事项:
1.单元格CELL和ROW对象下标都是从0开始的。
2.单元格合并时Region(1,2,3,4)第1个值的行号必须要比3位置的行号小,如果大于3就不能正常合并单元格
3.合并单元格的时候要合并的单单元格必须先创建,这样方便后面再次获取这个单元格来填充数据,主要就是因为合并时不能由后向前进行合并引起的。
- 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);
- /***这里是问题的关键,将这个工作簿写入到一个流中就可以输出相应的名字,这里需要写路径就ok了。
- FileOutputStream fileOut = new FileOutputStream("workbook.xls");
- wb.write(fileOut);
- fileOut.close();
- **/
- /**第二种是输出到也面中的excel名称
- * pName="栏目统计表";
- response.reset();
- response.setContentType("application/x-msdownload");
- response.setHeader("Content-Disposition","attachment; filename="+new String(pName.getBytes("gb2312"),"ISO-8859-1")+".xls");
- ServletOutputStream outStream=null;
- try{
- outStream = response.getOutputStream();
- wb.write(outStream);
- }catch(Exception e)
- {
- e.printStackTrace();
- }finally{
- outStream.close();
- }
- * */
- System.out.print("OK");
- } catch (Exception ex) {
- ex.printStackTrace();
- }
- }
- }
以上就是poi对excel的基本操作。这里主要介绍的是合并单元格和导出excel。