Java导出Excel的Springmvc实例

 @RequestMapping(value = "downloadExcel", method = RequestMethod.GET)
 public String download(HttpServletRequest request,HttpServletResponse response) throws IOException{
        String fileName="excel文件";
        //填充projects数据
        ExcelUtil excelUtil = new ExcelUtil();
        List<Project> projects = excelUtil.createData();
        List<Map<String,Object>> list = excelUtil.createExcelRecord(projects);
        String columnNames[]={"ID","项目名","销售人","负责人","所用技术","备注"};//列名
        String keys[]   =    {"id","name","saler","principal","technology","remarks"};//map中的key
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            ExcelUtil.createWorkBook(list,keys,columnNames).write(os);
        } catch (IOException e) {
            e.printStackTrace();
        }
        byte[] content = os.toByteArray();
        InputStream is = new ByteArrayInputStream(content);
        // 设置response参数，可以打开下载页面
        response.reset();
        response.setContentType("application/vnd.ms-excel;charset=utf-8");
        response.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".xls").getBytes(), "utf-8"));
        ServletOutputStream out = response.getOutputStream();
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            bis = new BufferedInputStream(is);
            bos = new BufferedOutputStream(out);
            byte[] buff = new byte[2048];
            int bytesRead;
            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, bytesRead);
            }
            bos.flush();
        } catch (final IOException e) {
         
         logger.error("导出Excel异常:",e);
            throw e;
        } finally {
            if (bis != null)
                bis.close();
            if (bos != null)
                bos.close();
        }
        return null;
    }
 
 /**
     * 导出Excel
     * @param request
     * @param response
     */
 @RequestMapping(value = "ProcessRequestExcel", method = RequestMethod.GET)
    public void ProcessRequest(HttpServletRequest request,HttpServletResponse response){
        java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyyMMddhhmmss");
        String now = format.format(new Date());
        String exportFileName = "信息导出_"+now+".xls";//导出文件名
        List<Basicinfo> list = getInfoList();
        HSSFWorkbook workBook = null;
        String[] cellTitle = {"序号", "姓名", "性别", "部门"};
        try {
            workBook = new HSSFWorkbook();//创建工作薄
            HSSFSheet sheet = workBook.createSheet();
            workBook.setSheetName(0, "订单信息");//工作簿名称
            HSSFFont font = workBook.createFont();  
            font.setColor(HSSFFont.COLOR_NORMAL);
            font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
            HSSFCellStyle cellStyle = workBook.createCellStyle();//创建格式
            cellStyle.setFont(font);
            cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
            cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
            //创建第一行标题
            HSSFRow titleRow = sheet.createRow((short) 0);//第一行标题
            for(int i = 0,size = cellTitle.length; i < size; i++){//创建第1行标题单元格    
                sheet.setColumnWidth(i,4000);
                HSSFCell cell = titleRow.createCell(i,0);        
                cell.setCellStyle(cellStyle);
                cell.setCellValue(cellTitle[i]);
            }
            //从第二行开始写入数据
            for(int i=1,size = list.size();i<size;i++){
                HSSFRow row = sheet.createRow((short) i);
                Basicinfo entity = list.get(i);
                for (int j = 0,length=cellTitle.length; j < length; j++) {
                    HSSFCell cell = row.createCell(j, 0);// 在上面行索引0的位置创建单元格
                    cell.setCellType(HSSFCell.CELL_TYPE_STRING);// 定义单元格为字符串类型
                    switch(j){// 在单元格中输入一些内容
                    case 0:
                        cell.setCellValue(String.valueOf(i));
                        break;
                    case 1:
                        cell.setCellValue(entity.getName());
                        break;
                    case 2:
                        cell.setCellValue(entity.getSex());
                        break;
                    case 3:
                        cell.setCellValue(entity.getDepart());
                        break;
                    }
                }
            }
             
            // 表示以附件的形式把文件发送到客户端
            response.setHeader("Content-Disposition", "attachment;filename=" + new String((exportFileName).getBytes(), "ISO8859-1"));//设定输出文件头
            response.setContentType("application/vnd.ms-excel;charset=UTF-8");// 定义输出类型
             
            // 通过response的输出流把工作薄的流发送浏览器形成文件
            OutputStream outStream = response.getOutputStream();
            workBook.write(outStream);
            outStream.flush();
            outStream.close();
        }catch(IOException e){
            System.out.println("IO 异常！"+e.getMessage());
            e.printStackTrace();
        }finally{
         
        }
    }
     
    /**
     * 模拟数据库获取信息
     * @return
     */
    @SuppressWarnings("unchecked")
 public List<Basicinfo> getInfoList(){
        List<Basicinfo> list = new ArrayList();
        for(int i=1;i<101;i++){
            Basicinfo entity = new Basicinfo();
            entity.setName("员工"+i);
            entity.setSex(i%2==1?"男":"女");
            entity.setDepart(i>80?"销售部":"财务部");
            list.add(entity);
        }
        return list;
    }

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