1.conn.setRequestProPerty(name,value)，两个参数都是字符串。。。。

2.用httpURLConnection的setRequestProPerty(name,value)方法，就能向header里添加信息。

如：设置content-type

httpURLConnection.setRequestProperty("token", "10051:abc");
        httpURLConnection.setRequestProperty("Content-type", "application/json");