HttpClient上传文件传入MultipartFile类型

Love The Way You Lie 2022-01-26 01:47 595阅读 0赞

通常我们在使用httpclient的时候，一把都是使用get或者postd的方式传输一些数据。在近期的项目中有这样的一个需求，我需要通过httpclient去调用一个写好的文件上传的接口，接口中是使用MultipartFile 来接受文件类型参数的。在这种情况下我们就开辟一个HttpClient中的高级功能了。直接上代码，封装了一个工具类：

/**
         * 使用httpclint 发送文件
         * @author: qingfeng
         * @date: 2019-05-27
         * @param file
         *            上传的文件
         * @return 响应结果
         */
        public static String uploadFile(String url ,MultipartFile file,String fileParamName,Map<String,String>headerParams,Map<String,String>otherParams) {
            CloseableHttpClient httpClient = HttpClients.createDefault();
            String result = "";
            try {
                String fileName = file.getOriginalFilename();
                HttpPost httpPost = new HttpPost(url);
                //添加header
                for (Map.Entry<String, String> e : headerParams.entrySet()) {
                    httpPost.addHeader(e.getKey(), e.getValue());
                }
                MultipartEntityBuilder builder = MultipartEntityBuilder.create();
                builder.setCharset(Charset.forName("utf-8"));
                builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);//加上此行代码解决返回中文乱码问题
                builder.addBinaryBody(fileParamName, file.getInputStream(), ContentType.MULTIPART_FORM_DATA, fileName);// 文件流
                for (Map.Entry<String, String> e : otherParams.entrySet()) {
                    builder.addTextBody(e.getKey(), e.getValue());// 类似浏览器表单提交，对应input的name和value
                }
                HttpEntity entity = builder.build();
                httpPost.setEntity(entity);
                HttpResponse response = httpClient.execute(httpPost);// 执行提交
                HttpEntity responseEntity = response.getEntity();
                if (responseEntity != null) {
                    // 将响应内容转换为字符串
                    result = EntityUtils.toString(responseEntity, Charset.forName("UTF-8"));
                }
            } catch (IOException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return result;
        }

要注意，这种情况下，一旦对方返回的结果中存在中文有可能出现乱码，解决方法就是向上面的代码中加入：

builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);//加上此行代码解决返回中文乱码问题、

解决浏览器兼容问题。 这样就可以顺利得到返回值了

调用案例：

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
     List<MultipartFile> files = multipartRequest.getFiles("repayFile");//从request中获取前端穿过来的文件
    
    //调用httpclient
     String res = HttpUtil.uploadFile("localhost:8080/upload", files.get(0), "repayFile", headers, paramMap);

上传文件的接口：

@RequestMapping(value = "/upload", method = {RequestMethod.POST })
    	public void fileBatchRepay(
    			@RequestParam(value = "repayFile") MultipartFile repayFile,
    			@RequestParam(value = "type") String type) {
    		Map<String, Object> result = new HashMap<String, Object>();
    		List<List<String>> list=new ArrayList<List<String>>();
    	    try {
    			list = borrowRepayService.fileBatchRepay(repayFile,type);
    	    	String title = "exel模板demo";
    	    	RepayExcelModel report = new RepayExcelModel();
    			String fileName = report.saveExcelByList(list, title, repayFile.getOriginalFilename(),request);
    	    	result.put(Constant.RESPONSE_DATA, "/down.htm?path="+fileName);
    	    	result.put(Constant.RESPONSE_CODE, Constant.SUCCEED_CODE_VALUE);
    			result.put(Constant.RESPONSE_CODE_MSG, "获取成功");
    		} catch (BussinessException e) {
    			logger.error(e.getMessage(),e);
    			result.put(Constant.RESPONSE_CODE, Constant.FAIL_CODE_VALUE);
    			result.put(Constant.RESPONSE_CODE_MSG, e.getMessage());
    		} catch (Exception e) {
    			logger.error(e.getMessage(),e);
    			result.put(Constant.RESPONSE_CODE, Constant.FAIL_CODE_VALUE);
    			result.put(Constant.RESPONSE_CODE_MSG, "失败");
    		}
    	    ServletUtils.writeToResponse(response, result);
    	}

好了，就分享到这里，希望对大家有帮助

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