HttpClient

 

HttpClient详细使用示例

https://blog.csdn.net/justry_deng/article/details/81042379

multipart/form-data 示列

        String result = null;
　　　　 File file = new File("");

        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.addBinaryBody("file", file, ContentType.APPLICATION_OCTET_STREAM, file.getName());

        HttpPost httpPost = new HttpPost(url);
        httpPost.addHeader("Content-Type", "multipart/form-data");
        httpPost.setEntity(builder.build());
        HttpResponse response = HttpClients.createDefault().execute(httpPost);
        if (response != null) {
            HttpEntity resEntity = response.getEntity();
            if (resEntity != null) {
                result = EntityUtils.toString(resEntity, "utf-8");
            }
        }