Apache POI导出excel

public String exportXls(HttpServletRequest request, HttpServletResponse response) {
        try {
            HSSFWorkbook wb = new HSSFWorkbook();
            HSSFRow row = null;
            HSSFCell cell = null;
            //建立新的sheet对象
            HSSFSheet sheet = wb.createSheet("导出信息");//sheet的名称
            sheet.setColumnWidth(0, 5*256);//设置第columnIndex+1列的列宽，单位为字符宽度的1/256
            sheet.setColumnWidth(1, 30*256);
            sheet.setColumnWidth(2, 20*256);
            sheet.setColumnWidth(3, 10*256);
            sheet.setColumnWidth(4, 10*256);
            sheet.setColumnWidth(5, 10*256);
            sheet.setColumnWidth(6, 10*256);
            sheet.setColumnWidth(7, 10*256);
            //标题样式
            HSSFCellStyle titleStyle = wb.createCellStyle();
            titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
            titleStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
            org.apache.poi.ss.usermodel.Font ztFont = wb.createFont();
            ztFont.setItalic(false);
            ztFont.setColor(org.apache.poi.ss.usermodel.Font.COLOR_NORMAL);
            ztFont.setFontHeightInPoints((short) 16);
            ztFont.setFontName("宋体");
            ztFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);

            titleStyle.setFont(ztFont);

            //----------------二级标题格样式----------------------------------
            HSSFCellStyle titleStyle2 = wb.createCellStyle();        //表格样式
            titleStyle2.setAlignment(HSSFCellStyle.ALIGN_LEFT);
            titleStyle2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
            HSSFFont ztFont2 = wb.createFont();
            ztFont2.setItalic(false);                     // 设置字体为斜体字
            ztFont2.setColor(org.apache.poi.ss.usermodel.Font.COLOR_NORMAL);
            ztFont2.setFontHeightInPoints((short)11);    // 将字体大小设置为18px
            ztFont2.setFontName("宋体");             // 字体应用到当前单元格上
            titleStyle2.setFont(ztFont2);
            //----------------------------------------------------------
            //----------------单元格样式----------------------------------
            HSSFCellStyle cellStyle = wb.createCellStyle();        //表格样式
            cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
            cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
            cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
            cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
            cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
            cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
            HSSFFont cellFont = wb.createFont();
            cellFont.setItalic(false);                     // 设置字体为斜体字
            cellFont.setColor(org.apache.poi.ss.usermodel.Font.COLOR_NORMAL);
            cellFont.setFontHeightInPoints((short)10);    // 将字体大小设置为18px
            cellFont.setFontName("宋体");             // 字体应用到当前单元格上
            cellStyle.setFont(cellFont);
            cellStyle.setWrapText(true);//设置自动换行
            //----------------------------------------------------------
            // ----------------------创建第一行---------------
            // 在sheet里创建第一行，参数为行索引(excel的行)，可以是0～65535之间的任何一个
            row = sheet.createRow(0);
            // 创建单元格（excel的单元格，参数为列索引，可以是0～255之间的任何一个
            cell = row.createCell(0);
            // 合并单元格CellRangeAddress构造参数依次表示 起始行，截至行，起始列， 截至列
            sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 7));
            // 设置单元格内容
            cell.setCellValue("测试excel");
            cell.setCellStyle(titleStyle);
            // ----------------------------------------------

            // ------------------创建第二行()---------------------
            row = sheet.createRow(1); // 创建第二行
            cell = row.createCell(0);
            sheet.addMergedRegion(new CellRangeAddress(1, 1, 0, 1));
            cell.setCellValue("入库单号:15203");
            cell.setCellStyle(titleStyle2);


            cell = row.createCell(2);
            sheet.addMergedRegion(new CellRangeAddress(1, 1, 2, 4));
            cell.setCellValue("执行单号:14520");
            cell.setCellStyle(titleStyle2);

            cell = row.createCell(5);
            sheet.addMergedRegion(new CellRangeAddress(1, 1, 5, 7));
            String createDate = MapUtil.getRealValue(headInfo, "create_date", "");
            cell.setCellValue("创建时间:2018-06-19 13:59:23");
            cell.setCellStyle(titleStyle2);

            //---------------------创建第三行-------------------------------------

            row = sheet.createRow(2);
            cell = row.createCell(0);
            sheet.addMergedRegion(new CellRangeAddress(2, 2, 0, 1));
            cell.setCellValue("供应商:京东");
            cell.setCellStyle(titleStyle2);


            cell = row.createCell(2);
            sheet.addMergedRegion(new CellRangeAddress(2, 2, 2, 4));
            cell.setCellValue("仓库名称:一号仓库");
            cell.setCellStyle(titleStyle2);

            cell = row.createCell(5);
            sheet.addMergedRegion(new CellRangeAddress(2, 2, 5, 7));
            cell.setCellValue("总金额:23.65");
            cell.setCellStyle(titleStyle2);



            // ------------------创建表头start---------------------
            row = sheet.createRow(3); // 创建第四行
            sheet.addMergedRegion(new CellRangeAddress(3, 3, 0, 0));
            cell = row.createCell(0);
            cell.setCellValue("序号");
            cell.setCellStyle(cellStyle);

            sheet.addMergedRegion(new CellRangeAddress(3, 3, 1, 1));
            cell = row.createCell(1);
            cell.setCellValue("物料名称");
            cell.setCellStyle(cellStyle);

            sheet.addMergedRegion(new CellRangeAddress(3, 3, 2, 2));
            cell = row.createCell(2);
            cell.setCellValue("物料编号");
            cell.setCellStyle(cellStyle);

            sheet.addMergedRegion(new CellRangeAddress(3, 3, 3, 3));
            cell = row.createCell(3);
            cell.setCellValue("物料产地");
            cell.setCellStyle(cellStyle);


            sheet.addMergedRegion(new CellRangeAddress(3, 3, 4, 4));
            cell = row.createCell(4);
            cell.setCellValue("入库价格");
            cell.setCellStyle(cellStyle);

            sheet.addMergedRegion(new CellRangeAddress(3, 3, 4, 4));
            cell = row.createCell(5);
            cell.setCellValue("参考价格");
            cell.setCellStyle(cellStyle);


            sheet.addMergedRegion(new CellRangeAddress(3, 3, 5, 5));
            cell = row.createCell(6);
            cell.setCellValue("需求数量");
            cell.setCellStyle(cellStyle);

            sheet.addMergedRegion(new CellRangeAddress(3, 3, 6, 6));
            cell = row.createCell(7);
            cell.setCellValue("总金额");
            cell.setCellStyle(cellStyle);

　　　　　　　　//循环填充数据
            int i =1;
            int rowNum= 3;
            List<Object> data = null;
            for (Map m : mapList) {
                data = new ArrayList<>();
                data.add(i);
                data.add((String) m.get("wuliao_name"));
                data.add((String) m.get("wuliao_no"));
                data.add((String) m.get("wuliao_address"));
                data.add((Double) m.get("danjia"));
                data.add((Double) m.get("reference_price"));
                data.add((Integer) m.get("wuliao_count"));
                data.add((Double) m.get("totalmoney"));

                rowNum ++;    //从第四行开始
                row = sheet.createRow(rowNum);
                for (int j = 0; j < data.size(); j++) {        //将数据添加到单元格中
                    sheet.addMergedRegion(new CellRangeAddress(rowNum, rowNum, j, j));
                    cell = row.createCell(j);
                    cell.setCellValue(""+data.get(j)+"");
                    cell.setCellStyle(cellStyle);
                }
                i++;
            }
　　　　　　//添加底部合计行
            row = sheet.createRow(rowNum+1);
            sheet.addMergedRegion(new CellRangeAddress(rowNum+1, rowNum+1, 0, 4));
            cell = row.createCell(0);
            cell.setCellStyle(cellStyle);
            cell = row.createCell(1);
            cell.setCellStyle(cellStyle);
            cell = row.createCell(2);
            cell.setCellStyle(cellStyle);
            cell = row.createCell(3);
            cell.setCellStyle(cellStyle);
            cell = row.createCell(4);
            cell.setCellStyle(cellStyle);

            cell = row.createCell(5);
            cell.setCellStyle(cellStyle);

            cell = row.createCell(6);
            cell.setCellValue(totalNumber);
            cell.setCellStyle(cellStyle);

            cell = row.createCell(7);
            cell.setCellValue(new BigDecimal(totalMoney).setScale(2, RoundingMode.DOWN).toString());
            cell.setCellStyle(cellStyle);

            OutputStream output = response.getOutputStream();
            response.reset();
            response.setHeader("Content-disposition",
                    "attachment; filename=测试导出.xls");    //filename =  文件名
            response.setContentType("application/msexcel");
            wb.write(output);
            output.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
}