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();     } }    }