Question

我想将一些文字和图片发送到服务器。我为此目的使用MultipartEntityBuilder。但是从API 22开始HttpEntity被折旧。那么，我该如何将我的多部分添加到HttpURLConnection？

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);

MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();
multipartEntityBuilder.setCharset(MIME.UTF8_CHARSET);

multipartEntityBuilder.addTextBody("fname", fname, ContentType.create("text/plain", MIME.UTF8_CHARSET));
                    .
                    .
                    .
multipartEntityBuilder.addTextBody("admin_id", adminDataListener.getAdminId(),
                            ContentType.create("text/plain", MIME.UTF8_CHARSET));

if (imageAttached){
multipartEntityBuilder.addTextBody("existing_image", adminDataListener.getAdminId(),
ContentType.create("text/plain", MIME.UTF8_CHARSET));
                        multipartEntityBuilder.addBinaryBody("image1 ", newImageFile, ContentType.MULTIPART_FORM_DATA,
                                newImageFile.getName());
} else {
        multipartEntityBuilder.addTextBody("existing_image", adminDataListener.getAdminImage(),
        ContentType.create("text/plain", MIME.UTF8_CHARSET));
        }

Answer 1

您必须定义边界并使用它构建多部分有效负载。

String boundary = "-----stackoverflow--------" + System.currentTimeMillis();

multipartEntityBuilder.setBoundary(boundary);

然后你应该通过以下方式告诉服务器使用的边界：

conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

最后构建一个HttpEntry并让它将其内容写入输出流

HttpEntity entity = multipartEntityBuilder.build();
entity.writeTo(conn.getOutputStream());

以通常的方式获取响应代码并返回页面。

将MulitpartEnityBuilder添加到HttpURLConnection

1 个答案: