它们说的头部, 和用curl的header一个样吗?
...
URL httpUrl = new URL(billing_url);
HttpURLConnection http = (HttpURLConnection)httpUrl.openConnection();
http.setRequestProperty("opcode", String.valueOf(opcode)); //头部
http.setRequestProperty("appkey",appkey); //头部
http.setRequestProperty("sign", sign); //头部
http.setRequestProperty("tag", String.valueOf(tag)); //头部
http.setRequestProperty("channelId",String.valueOf(channelId)); //头部
http.setConnectTimeout(3000);
http.setRequestMethod("POST"); //post方式
http.setDoInput(true);
http.setDoOutput(true);
PrintWriter out = new PrintWriter(http.getOutputStream());
out.print("data="+data); //注意data传递方式
out.flush();
...
