Android客户端采用RestTemplate实现附件的上传_resttemplate android-优快云博客

本文链接：https://blog.youkuaiyun.com/smileiam/article/details/50588950

本文介绍了一个具体的案例，展示了如何使用Android客户端通过RestTemplate上传图片到服务器，并详细解释了服务器端如何处理这些上传的图片文件。文章包括了客户端和服务端的具体代码实现。

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由于项目需要，近期研究了下Android客户端上传图片至服务器端，服务器端和客户端分别怎么处理的。公司Android客户端的请求一直用的是webService这套框架，理由也不多说。下面分别说说服务器端和客户端都怎么实现的：

1、服务器端代码

// 上传个人资料的头像
	@RequestMapping(value = "/uploadAttachement", method = RequestMethod.POST)
	public void uploadAttachement(@RequestParam(value = "avatar", required = false) MultipartFile file,
								  HttpServletRequest request, HttpServletResponse response) throws Exception {
		RequestContext requestContext = new RequestContext(request);
		JSONObject json = new JSONObject();
		if (!file.isEmpty()) {
			if (file.getSize() > 2097152) {
				json.put("message", requestContext.getMessage("g_fileTooLarge"));
			} else {
				try {
					String originalFilename = file.getOriginalFilename();
					String fileName = sdf.format(new Date()) + JavaEEFrameworkUtils.getRandomString(3) + originalFilename.substring(originalFilename.lastIndexOf("."));
					File filePath = new File(getClass().getClassLoader().getResource("/").getPath().replace("/WEB-INF/classes/", "/static/upload/img/" + DateFormatUtils.format(new Date(), "yyyyMM")));
					if (!filePath.exists()) {
						filePath.mkdirs();
					}
					file.transferTo(new File(filePath.getAbsolutePath() + "\\" + fileName));
					
				} catch (Exception e) {
					e.printStackTrace();
					json.put("message", requestContext.getMessage("g_uploadFailure"));
				}
			}
		} else {
			json.put("message", requestContext.getMessage("g_uploadNotExists"));
		}
		writeJSON(response, json.toString());
	}

2、Android客户端采用RestTemplate实现附件的上传

/**
    * 附件上传
     * @param serverUrl 服务器地址
     * @param imagePath 图片地址，本地SD卡图片地址
    */
    public String uploadAvatars(String serverUrl, String imagePath){
        String response = "";
        serverUrl = "http://192.168.XX.XX/sys/sysuser/uploadAttachement";//自己服务器地址
        imagePath = Environment.getExternalStoragePublicDirectory("download/50/jxhd/").getPath() + "/test.jpg";//图片径

        MultiValueMap<String, Object> parts = new LinkedMultiValueMap<String, Object>();
        parts.add("avatar", new FileSystemResource(imagePath));

        RestTemplate restTemplate = new RestTemplate();
        try{
            FormHttpMessageConverter converter = new FormHttpMessageConverter();
            converter.addPartConverter(new ResourceHttpMessageConverter());//资源转换器设置
            restTemplate.getMessageConverters().add(converter);
        } catch (Exception e){
            e.printStackTrace();
        }

        HttpHeaders imageHeaders = new HttpHeaders();
        imageHeaders.setContentType(MediaType.MULTIPART_FORM_DATA);//Content-Type设置为multipart/form-data
        HttpEntity<MultiValueMap<String, Object>> imageEntity = new HttpEntity<MultiValueMap<String, Object>>(parts, imageHeaders);

        try {
            response = restTemplate.postForObject(serverUrl, imageEntity, String.class);
        } catch (HttpClientErrorException e) {
            e.printStackTrace();

        } catch (HttpServerErrorException e) {
            e.printStackTrace();

        } catch (ResourceAccessException e) {
            e.printStackTrace();

        } catch (RestClientException e) {
            e.printStackTrace();

        } catch (Exception e) {
            e.printStackTrace();
        }
        return response;

    }

大致就这样，中间也遇到很多问题，如：

遇到下面的错，主要是因为这是资源，用的转换器不正确，应该用ResourceHttpMessageConverter转换器

 Could not write request: no suitable HttpMessageConverter found for request type [org.springframework.web.multipart.commons.CommonsMultipartFile]