键值对和文件，其实就像网页上的表单一样,

传json就像上面一样，还可以传xml，

Content-Type:text/xml

Content-Type: application/x-www-form-urlencoded

这是键值对形式

HttpPost request = new HttpPost(url + action);

request.addHeader(USER_AGENT, AGENT);

request.addHeader("Content-Type", "application/json");

request.addHeader("Accept-Encoding", "gzip");

request.setEntity(new ByteArrayEntity(jsonData.getBytes(ENCODE)));