freemaker导出

一、创建ftl模板文件

1、将xls文件转换为xml格式

需要将xml中内容格式化一下，在线 XML 格式化 | 菜鸟工具 (jyshare.com)

将格式化好的内容，保存在 ftl 文件中，放入项目文件。

二、后端对数据做组装

Java代码中对导出文件做赋值

@Overridepublic void exportFile(String cityId, Date filingTime, HttpServletRequest request, HttpServletResponse response) {try {String fileName = "xxxxx.xls";String tplType = "ftl/constructionSafetySupervision.ftl";response.reset();response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");response.setCharacterEncoding("utf-8");response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName, "UTF8"));ConstructionSafetySupervision surveyDesignSupervision = new ConstructionSafetySupervision();surveyDesignSupervision.setFilingTime(filingTime);surveyDesignSupervision.setCityId(cityId);List<ConstructionSafetySupervision> list = this.mapper.findList2(surveyDesignSupervision);TemplateResourceUtils.renderResponse(response.getWriter(), new TemplateResourceUtils.AbstractTemplateMap() {@Overrideprotected void getMapData(Map<String, Object> map) {map.put("empList", list);map.putAll(TemplateResourceUtils.getYearMouth(surveyDesignSupervision.getFilingTime()));}}, tplType, UserUtils.getUser().getId());FileUtil.deleteAllFilesOfDir(new File(System.getProperty("user.dir") + File.separator + "static/" + UserUtils.getUser().getId()));} catch (Exception e) {e.printStackTrace();}}

String tplType = "ftl/constructionSafetySupervision.ftl"; 模板所属路径

设置返回体的类型

response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");

存放文件名称 filename，URLEncoder.encode工具类将带有汉字的文件名做转换

 response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName, "UTF8"));

这里的map存放的就是在模板中需要遍历的数据集

  @Overrideprotected void getMapData(Map<String, Object> map) {map.put("empList", list);map.putAll(TemplateResourceUtils.getYearMouth(surveyDesignSupervision.getFilingTime()));

将数据传入到流中写入到文件里

    public static void renderResponse(Writer writer, AbstractTemplateMap templateMap, String templateFilePath ,String userId) throws Exception {Map<String,Object> map = Maps.newHashMap();templateMap.getMapData(map);String targetFilePath = System.getProperty("user.dir") + File.separator + "static/" + userId +File.separator + FileUtil.getFileName(templateFilePath);String content = FileUtils.getContentsAsString(getFile(templateFilePath,targetFilePath));FreeMarkers.renderResponse(writer ,content ,map);}

三、数据在 ftl 模板中如何遍历