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 JSON：

public String sendRequest(String request, String url, String token) throws IOException {        HttpClient httpclient = HttpClients.createDefault();        HttpPost httpPost = new HttpPost(url);        StringEntity entity = new StringEntity(request, "UTF-8");        entity.setContentEncoding("UTF-8");        entity.setContentType("application/json");        httpPost.setEntity(entity);        httpPost.setHeader("authorization", "Bearer " + token);        HttpResponse httpResponse = httpclient.execute(httpPost);        HttpEntity httpEntity = httpResponse.getEntity();        InputStream is = httpEntity.getContent();        ByteArrayOutputStream baos = new ByteArrayOutputStream();        byte[] buffer = new byte[2048];        int bytesRead;        try {            while ((bytesRead = is.read(buffer, 0, 1024)) != -1) {                baos.write(buffer, 0, bytesRead);            }        } catch (IOException ex) {            throw new RuntimeException(ex);        }        byte[] rep = baos.toByteArray();        String reponse = new String(rep, "UTF-8");        return reponse;    }

文件：

......httpPost.setEntity(MultipartEntityBuilder.create().addBinaryBody("file", file, ContentType.DEFAULT_BINARY, fileName).build());......

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