在使用springmvc提供rest接口实现文件上传时，有时为了测试需要使用RestTemplate进行调用，那么在使用RestTemplate调用文件上传接口时有什么特别的地方呢？实际上只需要注意一点就行了，就是创建文件资源时需要使用org.springframework.core.io.FileSystemResource类，而不能直接使用java.io.File对象。

Controller中的rest接口代码如下：

	@ResponseBody
	@RequestMapping(value = "/upload.do", method = RequestMethod.POST)
	public String upload(String fileName, MultipartFile jarFile) {
		// 下面是测试代码
		System.out.println(fileName);
		String originalFilename = jarFile.getOriginalFilename();
		System.out.println(originalFilename);
		try {
			String string = new String(jarFile.getBytes(), "UTF-8");
			System.out.println(string);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		// TODO 处理文件内容...
		return "OK";
	}

	@Test
	public void testUpload() throws Exception {
		String url = "http://127.0.0.1:8080/test/upload.do";
		String filePath = "C:\\Users\\MikanMu\\Desktop\\test.txt";

		RestTemplate rest = new RestTemplate();
		FileSystemResource resource = new FileSystemResource(new File(filePath));
		MultiValueMap<String, Object> param = new LinkedMultiValueMap<>();
		param.add("jarFile", resource);
		param.add("fileName", "test.txt");

		String string = rest.postForObject(url, param, String.class);
		System.out.println(string);
	}

其中：

		String string = rest.postForObject(url, param, String.class);

		HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String,Object>>(param);
		ResponseEntity<String> responseEntity = rest.exchange(url, HttpMethod.POST, httpEntity, String.class);
		System.out.println(responseEntity.getBody());

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springmvc RestTemplate文件上传