java使用Post方式发送https请求的方法，直接可以用

                踩过无数坑之后，成功的方案，主要在设置Content-type  application/x-www-form-urlencoded这里，之前没设置，一直数据不通过，不过好了现在OK了

                URL reqURL = new URL(url); //创建URL对象

HttpURLConnection httpsConn = (HttpURLConnection)reqURL.openConnection();
httpsConn.setDoOutput(true); 
httpsConn.setRequestMethod("POST");
httpsConn.setRequestProperty("Content-type", "application/x-www-form-urlencoded");
httpsConn.setRequestProperty("Accept-Charset", "utf-8");
httpsConn.setRequestProperty("contentType", "utf-8");
httpsConn.setRequestProperty("Content-Length", stringA.length()
+ "");
OutputStreamWriter out = new OutputStreamWriter(httpsConn.getOutputStream(),"utf-8"); 
out.write(stringA.toString()); 
out.flush(); 
out.close();
//取得该连接的输入流，以读取响应内容 
InputStreamReader insr = new InputStreamReader(httpsConn.getInputStream(),"utf-8");


//读取服务器的响应内容并显示
String result = "";
int respInt = insr.read();
while(respInt != -1){
result += (char)respInt;
respInt = insr.read();
}

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