public boolean post(String username, String password) throws Exception {

username = URLEncoder.encode(username);// 中文数据需要经过URL编码

password = URLEncoder.encode(password);

String params = "username=" + username + "&password=" + password; 

byte[] data = params.getBytes();

URL url = new URL(address);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setConnectTimeout();

//这是请求方式为POST

conn.setRequestMethod("POST");

//设置post请求必要的请求头

conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");// 请求头, 必须设置

conn.setRequestProperty("Content-Length", data.length + "");// 注意是字节长度, 不是字符长度

conn.setDoOutput(true);// 准备写出

conn.getOutputStream().write(data);// 写出数据

return conn.getResponseCode() == ;

}