Java Web利用POI导出Excel简单例子

采用Spring mvc架构： 
Controller层代码如下 

@Controller
public class StudentExportController{

    @Autowired
    private StudentExportService studentExportService;

    @RequestMapping(value = "/excel/export")
    public void exportExcel(HttpServletRequest request, HttpServletResponse response)
    throws Exception {

        List<Student> list = new ArrayList<Student>();
        list.add(new Student(1000,"zhangsan","20"));
        list.add(new Student(1001,"lisi","23"));
        list.add(new Student(1002,"wangwu","25"));
        HSSFWorkbook wb = studentExportService.export(list);
        response.setContentType("application/vnd.ms-excel");
        response.setHeader("Content-disposition", "attachment;filename=student.xls");
        OutputStream ouputStream = response.getOutputStream();
        wb.write(ouputStream);
        ouputStream.flush();
        ouputStream.close();
   }
}

Service层代码如下： 

@Service
public class StudentExportService {

    String[] excelHeader = { "Sno", "Name", "Age"};
    public HSSFWorkbook export(List<Student> list) {
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("Student");
        HSSFRow row = sheet.createRow((int) 0);
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        for (int i = 0; i < excelHeader.length; i++) {
            HSSFCell cell = row.createCell(i);
            cell.setCellValue(excelHeader[i]);
            cell.setCellStyle(style);
            sheet.autoSizeColumn(i);
         // sheet.SetColumnWidth(i, 100 * 256);
        }

        for (int i = 0; i < list.size(); i++) {
            row = sheet.createRow(i + 1);
            Student student = list.get(i);
            row.createCell(0).setCellValue(student.getSno());
            row.createCell(1).setCellValue(student.getName());
            row.createCell(2).setCellValue(student.getAge());
        }
        return wb;
    }
}

前台的js代码如下： 

<script>
function exportExcel(){
     location.href="excel/export";
     <!--这里不能用ajax请求，ajax请求无法弹出下载保存对话框-->
 }
</script>