Java通过HttpClient实现请求接口发送文件

引入POM：

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.13</version>
        </dependency>
		 <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>4.5.13</version>
        </dependency>

代码实现：

    public void httpPostFile(String url, MultipartFile file) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        try {
            HttpPost httpPost = new HttpPost(url);
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            String filename = file.getOriginalFilename();
            builder.addBinaryBody("file", file.getBytes(), ContentType.MULTIPART_FORM_DATA, filename);
            // 如果需要，传递额外参数
            // StringBody fileName = new StringBody("文件名称", ContentType.MULTIPART_FORM_DATA);
            // StringBody userName = new StringBody("用户名", ContentType.MULTIPART_FORM_DATA);
            // builder.addPart("fileName", fileName);
            // builder.addPart("userName", userName);

            HttpEntity entity = builder.build();
            httpPost.setEntity(entity);
            CloseableHttpResponse response = httpClient.execute(httpPost);
            String result = EntityUtils.toString(response.getEntity(), "UTF-8");
            System.out.println("结果：" + result);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }