初试poi HssfWorkBook导出excel

昨天看了一个例子，是用户在填写注册信息的时候，能够导出该用户的注册信息，现在仅仅实现了这个功能，这是直接在servlet里面写的！

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
            response.setContentType("application/ vnd.ms-excel");//设置正文的MIME类型为excel           
        String name = request.getParameter("name");
        String psswd = request.getParameter("passwd");
        String sex = request.getParameter("sex");
        String email = request.getParameter("email");
        String fileName = "userinfo.xls";
        response.setHeader("Content-disposition","attachment;filename="+fileName);
        ServletOutputStream out = response.getOutputStream();//响应输出流对象
        HSSFWorkbook wb = new HSSFWorkbook();//创建excel表格
        HSSFSheet sheet = wb.createSheet("用户注册信息");//创建工作簿
        sheet.setColumnWidth(4, 5000);//设置列宽
        HSSFRow titleRow = sheet.createRow(0);//设置标题行
        HSSFCell titleCell = titleRow.createCell(0);//第一个单元格
        titleCell.setCellValue("用户姓名");//第一个值
        HSSFCell titleCel2 = titleRow.createCell(1);
        titleCel2.setCellValue("用户密码");
        HSSFCell titleCel3 = titleRow.createCell(2);
        titleCel3.setCellValue("用户性别");
        HSSFCell titleCel4 = titleRow.createCell(3);
        titleCel4.setCellValue("用户邮箱");
        HSSFRow rowValue = sheet.createRow(1);//设置第二行
        HSSFCell nameCell = rowValue.createCell(0);
        nameCell.setCellValue(name);
        HSSFCell passCell = rowValue.createCell(1);
        passCell.setCellValue(psswd);
        HSSFCell sexCell = rowValue.createCell(2);
        sexCell.setCellValue(sex);
        HSSFCell emailCell = rowValue.createCell(3);
        emailCell.setCellValue(email);
        wb.createCellStyle();
        wb.write(out);
        out.flush();
        out.close();
    }