JavaWeb开发中采用FreeMarker生成Excel表格

   public void exportExcel(){

            /** 1.从数据库查出数据 */

            List<User> uList = userService.findAll();

            /** 2.封装数据 */

            Map<String, Object> dataMap = new HashMap<String, Object>();

            List<Map<String, String>> userList = new ArrayList<>(uList.size());

            for (User u : uList) {

                Map<String, String> rowData = new HashMap<>();

                rowData.put("name", u.getName());

                rowData.put("account", u.getAccount());

                rowData.put("dept", u.getDept());

                rowData.put("gender", u.isGender() ? "男" : "女");

                rowData.put("email", u.getEmail());

                userList.add(rowData);

            }

            dataMap.put("userList", userList);

            /** 3.调用FreeMarker的Api生成Excel */

            Configuration cfg = new Configuration(Configuration.VERSION_2_3_22);

            // 设置加载模板文件的位置

            cfg.setServletContextForTemplateLoading(ServletActionContext.getServletContext(), "/ftl");

            // 获取模板

            Template template = cfg.getTemplate("exportExcel.ftl");

            // 设置response的header 

            HttpServletResponse response = ServletActionContext.getResponse();

            // 防止乱码，设置下编码

            response.setCharacterEncoding("utf-8");

            response.setHeader("Content-Disposition", "attachment; filename=testExcel.xls");

            // 生成Excel

            template.process(dataMap, response.getWriter());

        } catch (Exception e) {

            e.printStackTrace();

        }

    }