springboot复杂的模板导出

直接上干货：

	@ApiOperation(value = "模板下载", notes = "GET http://{host}:{port}/credit/publicity/config/template/downloadById")
	@RequestMapping(method = RequestMethod.GET,path="/template/downloadById")
	public ResponseEntity downloadById(HttpServletRequest request, String id){
		String filepath ="";

		switch (id) {
			case "1":
				filepath = "/file/template/模板名称.xlsx";
				break;
			case "2":
				filepath = "/file/template/模板名称2.xlsx";
				break;
			default:
				break;
		}

		ClassPathResource file = new ClassPathResource(filepath);
		try {
			HttpHeaders headers = new HttpHeaders();
			headers.add("Cache-Control", "no-cache, no-store, must-revalidate");
			headers.add("Content-Disposition", "attachment;filename="+ new String(file.getFilename().getBytes("utf-8"), "ISO8859-1"));
			headers.add("Pragma", "no-cache");
			headers.add("Expires", "0");
			return ResponseEntity
					.ok()
					.headers(headers)
					.contentLength(file.contentLength())
					.contentType(MediaType.parseMediaType("application/octet-stream"))
					.body(new InputStreamResource(file.getInputStream()));
		} catch (IOException e) {
			logger.error("系统异常：{}",e);
			return null;
		}
	}