导出Excel表格

// 第一步，创建一个webbook，对应一个Excel文件
HSSFWorkbook wb = new HSSFWorkbook();
// 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
HSSFSheet sheet = wb.createSheet("平均分");
//设置列宽
sheet.setColumnWidth(0,12*500);
sheet.setColumnWidth(1,25*500);
sheet.setColumnWidth(2,12*500);
sheet.setColumnWidth(3,5*500);
sheet.setColumnWidth(4,20*500);
sheet.setColumnWidth(5,5*500);
//字体
HSSFFont font = wb.createFont();
font.setFontHeightInPoints((short) 14);//设置字体大小
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//粗体
HSSFFont font1 = wb.createFont();
font.setFontHeightInPoints((short) 12);//设置字体大小
// 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
HSSFRow row = sheet.createRow((int) 0);
row.setHeightInPoints(25);
// 第四步，创建单元格
HSSFCellStyle styletitle  = wb.createCellStyle();//头样式
styletitle.setWrapText(true);//设置自动换行
styletitle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
styletitle.setAlignment(HorizontalAlignment.CENTER);//水平居中
styletitle.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
styletitle.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
styletitle.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
styletitle.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
styletitle.setFont(font);
HSSFCellStyle style = wb.createCellStyle();//内容样式
style.setFont(font1);
style.setWrapText(true);//设置自动换行
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
style.setAlignment(HorizontalAlignment.CENTER);//水平居中
style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
style.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
style.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
HSSFCell cell = row.createCell((short) 0);
cell.setCellValue("列1");
cell.setCellStyle(styletitle);
cell = row.createCell((short) 1);
cell.setCellValue("列2");
cell.setCellStyle(styletitle);
cell = row.createCell((short) 2);
cell.setCellValue("列13");
cell.setCellStyle(styletitle);
cell = row.createCell((short) 3);
cell.setCellValue("列4");
cell.setCellStyle(styletitle);
cell = row.createCell((short) 4);
cell.setCellValue("列5");
cell.setCellStyle(styletitle);
cell = row.createCell((short) 5);
cell.setCellValue("列6");
cell.setCellStyle(styletitle);
// 第五步，写入实体数据 实际应用中这些数据从数据库得到，
List<DepartmentScoreVo> departmentScoreVos = this.questionnaireService.selectScore(id);
if(departmentScoreVos != null && departmentScoreVos.size() > 0){
    int row1 = 1;
    int row2 = 1;
    int row3 = 0;
    if (departmentScoreVos != null && departmentScoreVos.size() > 0){
        for (int i = 0; i < departmentScoreVos.size(); i++) {
            row1 = row3+1;
            // 第四步，创建单元格，并设置值
            List<QuestionScoreVo> questionScoreVos = departmentScoreVos.get(i).getQuestionScoreVos();
            if (questionScoreVos != null && questionScoreVos.size() > 0){
                for (int j = 0; j < questionScoreVos.size(); j++){
                    row2 = row3+1;
                    List<DepartmentMarkVo> departmentMarkVos = questionScoreVos.get(j).getDepartmentMarkVos();
                    if (departmentMarkVos != null && departmentMarkVos.size() > 0){
                        for (int k = 0; k < departmentMarkVos.size(); k++){
                            row = sheet.createRow(row3+1);
                            row.setHeightInPoints(20);
                            row3++;
                            row.createCell((short) 0).setCellValue(departmentScoreVos.get(i).getDepartment().getName());
                            row.createCell((short) 1).setCellValue(questionScoreVos.get(j).getQuestion().getTitle());
                            row.createCell((short) 2).setCellValue(departmentMarkVos.get(k).getName());
                            if(departmentMarkVos != null && departmentMarkVos.get(k) != null && departmentMarkVos.get(k).getScore() != null){
                                row.createCell((short) 3).setCellValue(departmentMarkVos.get(k).getScore());
                            }else {
                                row.createCell((short) 3).setCellValue("弃权");
                            }
                            row.createCell((short) 4).setCellValue(departmentMarkVos.get(k).getCommentDesc());
                            if(questionScoreVos.get(j) != null && questionScoreVos.get(j).getAverageScore() != null && questionScoreVos.get(j).getAverageScore() != null){
                                row.createCell((short) 5).setCellValue(questionScoreVos.get(j).getAverageScore().doubleValue());
                            }else {
                                row.createCell((short) 5).setCellValue("");
                            }
                            row.getCell(0).setCellStyle(style);
                            row.getCell(1).setCellStyle(style);
                            row.getCell(2).setCellStyle(style);
                            row.getCell(3).setCellStyle(style);
                            row.getCell(4).setCellStyle(style);
                            row.getCell(5).setCellStyle(style);
                        }
                    }
                    if((row3 - row2) > 0){
                        sheet.addMergedRegion(new CellRangeAddress(row2,row3,1,1));
                        sheet.addMergedRegion(new CellRangeAddress(row2,row3,5,5));
                    }
                }
            }
            if ((row3 - row1) > 0){
                sheet.addMergedRegion(new CellRangeAddress(row1,row3,0,0));
            }
        }
    }

}
// 第六步，将文件存到指定位置
OutputStream out = null;
try {
    out = response.getOutputStream();
    String fileName = "表1.xls";// 文件名
    response.setContentType("application/x-msdownload");
    response.setHeader("Content-Disposition", "attachment; filename="
            + URLEncoder.encode(fileName, "UTF-8"));
    wb.write(out);
} catch (Exception e) {
} finally {
    try {
        out.close();
    } catch (IOException e) {
    }
}