java文件下载 springboot模板下载

 @RequiresPermissions("person:contract:list")
    @GetMapping("/downLoadTemplateChang")
    @ApiOperation("人员个税变更模板下载")
    public ResultData<?> downLoadTemplateChang(HttpServletRequest request,HttpServletResponse response,String name) throws IOException {
        service.downLoadTemplateChang(request,response,name);
        return ResultData.result();
    }

@Override
    public void downLoadTemplateChang(HttpServletRequest request, HttpServletResponse response, String name) {
        String filePath = null;
        try {
            //  filePath = request.getSession().getServletContext().getRealPath("/")+"public/template/personnelChange_template.xlsx";
            filePath = getClass().getResource("/public/template/personnelChange_template.xlsx").getPath();
        } catch (Exception e) {
            e.printStackTrace();
            throw new BaseException("下载异常,稍后重试");
        }
        FileUtils.goToDownload(response,filePath,name);
    }

/**
     * 下载
     *
     * @param response
     * @param downUrl  下载的路径
     * @param fileName 下载文件的名称
     */
    public static void goToDownload(HttpServletResponse response, String downUrl, String fileName) {
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/x-msdownload");
        try {
            //转Unicode不然ie会乱码
            String encodeFileName = URLEncoder.encode(fileName, "UTF-8");
            response.setHeader("Content-Disposition", "attachment;fileName=" + new String(encodeFileName.getBytes("UTF-8"), "ISO8859-1"));
            downUrl = URLDecoder.decode(downUrl, "UTF-8");
            File file = new File(downUrl);
            if (!file.exists()) {
                response.sendError(404, "File not found!");
                return;
            }
            long fileLength = file.length();
            response.setHeader("Content-Length", String.valueOf(fileLength));
            BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
            BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream());
            byte[] buff = new byte[2048];
            int bytesRead;
            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, bytesRead);
            }
            bis.close();
            bos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

<script type="text/javascript">
		//下载导入模板
		function download() {
			var name="人员个税变更模板.xlsx"
			var oReq = new XMLHttpRequest();
			oReq.open("GET", "/individualTaxChange/downLoadTemplateChang?name="+name, true);
			oReq.responseType = "blob";
			oReq.onload = function (oEvent) {
				var content = oReq.response;
				var elink = document.createElement('a');
				elink.download = name;
				elink.style.display = 'none';
				var blob = new Blob([content]);
				elink.href = URL.createObjectURL(blob);
				document.body.appendChild(elink);
				elink.click();
				document.body.removeChild(elink);
			};
			oReq.send();
		}
		</script>

<div id="show_div" style="display: none">
		<form class="form-horizontal m-t" id="shoutForm"  enctype="multipart/form-data" novalidate="novalidate">
			<div class="form-group">
				<button onclick="download()" type="button" class="btn btn-outline btn-success cens_item">下载导入模板</button>
			</div>
			<input type="file"  name="file" id="file_w" class="btn btn-sm btn-success btn_bg j-addGf" >
			<div class="form-group">

			</div>
			<div class="form-group">
				<div class="col-sm-4 col-sm-offset-3">
					<button class="btn btn-primary" onclick="submitSc()" type="button"  >提交</button>
				</div>
			</div>
		</form>
	</div>