POI 简单合并单元格

public class MergedCells {
   /** 测试使用的POI版本是3.1
     * @param args
     */
     public static void main(String[] args) throws IOException {   
            HSSFWorkbook wb = new HSSFWorkbook();   
            HSSFSheet sheet = wb.createSheet("new sheet");   

            HSSFRow row = sheet.createRow(1);   
            HSSFCell cell = row.createCell((short)1);   
            cell.setCellValue("This is a test of merging");   
            
            //1.生成字体对象
            HSSFFont font = wb.createFont();
            font.setFontHeightInPoints((short) 10);
            font.setFontName("新宋体");
            font.setColor(HSSFColor.BLUE.index);
            font.setBoldweight((short) 0.8);
            //2.生成样式对象
            HSSFCellStyle style = wb.createCellStyle();
            style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
            style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
            style.setFont(font); //调用字体样式对象
            style.setWrapText(true);
                           //增加表格边框的样式 例子
                           style.setBorderTop(HSSFCellStyle.BORDER_DOUBLE);
                       style.setBorderLeft(HSSFCellStyle.BORDER_DOUBLE);
                       style.setTopBorderColor(HSSFColor.GOLD.index);
                       style.setLeftBorderColor(HSSFColor.PLUM.index);

            //3.单元格应用样式
            cell.setCellStyle(style);
            

            
            //新版用法 3.8版
//             sheet.addMergedRegion(new CellRangeAddress(   
//                     1, //first row (0-based)  from 行   
//                     2, //last row  (0-based)  to 行   
//                     1, //first column (0-based) from 列   
//                     1  //last column  (0-based)  to 列   
//             ));   
            //表示合并B2,B3
            sheet.addMergedRegion(new Region(   
                     1, //first row (0-based)     
                    (short)1, //first column  (0-based)     
                     2, //last row (0-based)  
                    (short)1  //last column  (0-based)     
             ));   
            
            //合并叠加  表示合并B3 B4。但是B3已经和B2合并了，所以，变成B2:B4合并了
            sheet.addMergedRegion(new Region(   
                     2, //first row (0-based)     
                    (short)1, //first column  (0-based)     
                     3, //last row (0-based)  
                    (short)1  //last column  (0-based)     
             ));  
            
            //一下代码表示在D4 cell 插入一段字符串
            HSSFRow row2 = sheet.createRow(3);
            HSSFCell cell2 = row2.createCell((short)3); 
            cell2.setCellValue("this is a very very very long string , please check me out.");
                      //cell2.setCellValue(new HSSFRichTextString("我是单元格！"));


             // Write the output to a file   
             FileOutputStream fileOut = new FileOutputStream("workbook.xls");   
             wb.write(fileOut);   
             fileOut.close();   
         }   
}