[Java知识库]POST请求发送MultipartFile文件

业务背景
上传商品到第三方平台,需要先将商品的图片地址换成该平台的图片地址

	/**
	 * POST请求发送MultipartFile文件参数
	 */
	public String doPostFile(String url, List<String> imageUrls, String fileParName,
													 int timeout) {
		String resultMap = null;
		CloseableHttpClient httpClient = HttpClients.createDefault();
		String result = "";
		try {
			HttpPost httpPost = new HttpPost(url);
			MultipartEntityBuilder builder = MultipartEntityBuilder.create();
			builder.setCharset(java.nio.charset.Charset.forName("UTF-8"));
			builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
			for (String imageUrl : imageUrls) {
				byte[] bytes = HttpUtil.downloadBytes(imageUrl);
				builder.addBinaryBody(fileParName, bytes, ContentType.MULTIPART_FORM_DATA, UUID.randomUUID().toString());// 文件流
			}
			//决中文乱码
			// ContentType contentType = ContentType.create(HTTP.PLAIN_TEXT_TYPE, HTTP.UTF_8);

			HttpEntity entity = builder.build();
			httpPost.setEntity(entity);
			org.apache.http.HttpResponse response = httpClient.execute(httpPost);// 执行提交

			// 设置连接超时时间
			RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(timeout)
				.setConnectionRequestTimeout(timeout).setSocketTimeout(timeout).build();
			httpPost.setConfig(requestConfig);

			HttpEntity responseEntity = response.getEntity();

			if (responseEntity != null) {
				// 将响应内容转换为字符串
				result = EntityUtils.toString(responseEntity, java.nio.charset.Charset.forName("UTF-8"));
				resultMap = result;
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				httpClient.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return resultMap;
	}