小编mah*_*esh的帖子

我试图使用以下代码将JSONObject从Android应用程序发布到php Web应用程序.

String url = "http://10.0.2.2/test/"
URL rest_url = new URL(url);
JSONObject params = new JSONObject();
params.put("username","admin"); 

// Send POST data request
BufferedReader reader=null;

DataOutputStream printout;
URLConnection conn = rest_url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestProperty("Content-Type", "application/json");
conn.setRequestProperty("Accept", "application/json");
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write( params.toString());
wr.close();

当我尝试在php中检索用户名时,我得到空值.

 <?php echo $_POST['username'];
 ?>