SpringBoot+thymeleaf實現模板文件下載

1.配置文件：
    pom.xml中添加依賴：
    <!-- thymeleaf模版 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
    application.yml文件中添加要下載的模板文件存放地址

    
    添加讀取配置的模板存放地址

2.前台代碼
    <a href="javascript:downTemple()" style="color:#1c99ef;text-decoration:underline;">下載模板</a>

　　function downTemple(){
       window.location.href="/UserController/downTemple";
   }

3.后台代碼
     @RequestMapping(value = "/downTemple")
    public String downTemple(HttpServletResponse response, RedirectAttributes redirectAttributes) {
         String fileName = "用戶信息模板.xlsx";// 設置文件名，根據業務需要替換成要下載的文件名
         if (fileName != null) {
             //設置文件路徑
             String realPath = configProperties.getExcelTemplateDpwloadPath();//這里使用配置類配置文件路徑
             File file = new File(realPath , fileName);
             if (file.exists()) {
                 try {
                    response.setContentType("application/force-download");// 設置強制下載不打開
                    fileName =java.net.URLDecoder.decode(fileName,"UTF-8");
                    response.addHeader("Content-Disposition", "attachment;fileName=" +  new String(fileName.getBytes("GB2312"),"iso8859-1"));// 設置文件名 中文要編碼后才可以
                 } catch (UnsupportedEncodingException e1) {
                    // TODO 自動生成的 catch 塊
                    e1.printStackTrace();
                 }
                
                 byte[] buffer = new byte[1024];
                 FileInputStream fis = null;
                 BufferedInputStream bis = null;
                 try {
                     fis = new FileInputStream(file);
                     bis = new BufferedInputStream(fis);
                     OutputStream os = response.getOutputStream();
                     int i = bis.read(buffer);
                     while (i != -1) {
                         os.write(buffer, 0, i);
                         i = bis.read(buffer);
                     }
                 } catch (Exception e) {
                     e.printStackTrace();
                 } finally {
                     if (bis != null) {
                         try {
                             bis.close();
                         } catch (IOException e) {
                             e.printStackTrace();
                         }
                     }
                     if (fis != null) {
                         try {
                             fis.close();
                         } catch (IOException e) {
                             e.printStackTrace();
                         }
                     }
                 }
             }
         }
        return null;
    }