Controller层代码如下：

   @Controller

    public class ExportController{   

        @Autowired   

        private ExportService exportService;   

        @RequestMapping(value = "/export/excel")   

        public void exportExcel(HttpServletRequest request, HttpServletResponse response)   

        throws Exception {   

            //生成一个列表信息

            List<Student> list = new ArrayList<Student>();   

            list.add(new Student(0001,"童年","22","男"));   

            list.add(new Student(0002,"光光","23","女"));   

            list.add(new Student(0003,"丁丁","21","男")); 

            XSSFWorkbook wb = exportService.export(list);   

            response.setContentType("application/vnd.ms-excel");   

            response.setHeader("Content-disposition", "attachment;filename=student.xlsx");   

            OutputStream ouputStream = response.getOutputStream();   

            wb.write(ouputStream);   

            ouputStream.flush();   

            ouputStream.close();   

      }   

    } 

Service层代码如下：

@Service

public class ExportService {

        //定义表头

        String[] excelHeader = {"学号", "姓名", "年龄","性别"};   

        public XSSFWorkbook export(List<Campaign> list) {   

            //这里需要说明一个问题：如果是 Offices 2007以前的Excel版本，new的对象是：**HSSFWorkbook** ，Offices 2007以后的Excel版本new的对象才是XSSFWorkbook

            XSSFWorkbook wb = new XSSFWorkbook(); 

            //生成一个工作表

            Sheet sheet = wb.createSheet("学生表");

            //生成第一行

            Row row = sheet.createRow((int) 0);   

            //生成单元格的样式style

            XSSFCellStyle style = wb.createCellStyle();   

            style.setAlignment(CellStyle.ALIGN_CENTER);

            for (int i = 0; i < excelHeader.length; i++) {

                //获取每一个单元格

                Cell cell = row.createCell(i);   

                //给单元格赋值

                cell.setCellValue(excelHeader[i]);   

                //设置单元格的样式

                cell.setCellStyle(style);

            }   

            for (int i = 0; i < list.size(); i++) {   

                //得到当前行数的下一行（row.getRowNum()：得到当前行数）

                row = sheet.createRow(row.getRowNum() + 1);   

                Student student = list.get(i);   

                //赋值

                row.createCell(0).setCellValue(student.getSno());   

                row.createCell(1).setCellValue(student.getName());   

                row.createCell(2).setCellValue(student.getAge());   

                row.createCell(3).setCellValue(student.getSex());

            }   

            return wb;   

        }   

    }