weixin_java
weixin
2016-01-08
近期研究微信文件上传接口，
使用环境，Java开发，httpclient4.3.6，
部分代码如下：
HttpEntity reqEntity = MultipartEntityBuilder.create()
.setMode(HttpMultipartMode.BROWSER_COMPATIBLE)
.addBinaryBody("media", file, ContentType.create("image/jpeg"), file.getName())
.setCharset(Consts.UTF_8)
.build();
出现{"errcode":41005,"errmsg":"media data missing hint: [......]"}
错误信息，通过wireshark抓包分析后，
异常数据包头：
Content-Length: 22033
Content-Type: multipart/form-data; boundary=2LQLHP0BPrf8kJsfxQwWI5lyJ3tp4eK9V1ryWo; charset=ISO-8859-1
Content-Encoding: UTF-8
Host: file.api.weixin.qq.com
Connection: Keep-Alive
User-Agent: Apache-HttpClient/4.3.1 (java 1.5)
Accept-Encoding: gzip,deflate
--2LQLHP0BPrf8kJsfxQwWI5lyJ3tp4eK9V1ryWo
Content-Disposition: form-data; name="media"; filename="......_20160105_175814.jpg"
Content-Type: image/jpeg
......
.. ...
--2LQLHP0BPrf8kJsfxQwWI5lyJ3tp4eK9V1ryWo--
正常数据包头:
Content-Length: 22041
Content-Type: multipart/form-data; charset=ISO-8859-1
Content-Encoding: UTF-8
Host: file.api.weixin.qq.com
Connection: Keep-Alive
User-Agent: Apache-HttpClient/4.3.1 (java 1.5)
Accept-Encoding: gzip,deflate
-------------------------------1452219591728
Content-Disposition: form-data; name="media"; filename="......_20160105_175814.jpg"
Content-Type: image/jpeg
......
-------------------------------1452219591728--
Google后解决，正确代码如下：
HttpEntity reqEntity = MultipartEntityBuilder.create()
.setMode(HttpMultipartMode.BROWSER_COMPATIBLE)
.addBinaryBody("media", file, ContentType.create("image/jpeg"), file.getName())
.setCharset(Consts.UTF_8)
.build();
httpPost.setHeader("Content-Encoding", "UTF-8");
httpPost.setHeader("Content-Type", ContentType.MULTIPART_FORM_DATA.toString());
发现问题出在"Content-Type"上：
httpPost.setHeader("Content-Type", ContentType.MULTIPART_FORM_DATA.toString());