public static String sendPost(String url, String param) {
OutputStreamWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 開啟和URL之間的連線
HttpURLConnection  conn = (HttpURLConnection) realUrl.openConnection();
// 設定通用的請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 傳送POST請求必須設定如下兩行
conn.setDoOutput(true);
conn.setDoInput(true);
// 獲取URLConnection物件對應的輸出流
// out = new PrintWriter(conn.getOutputStream());
out = new OutputStreamWriter(conn.getOutputStream(), "utf-8"); // 8859_1
out.write(param); // post的關鍵所在
// 傳送請求引數
// out.print(param);
// flush輸出流的緩衝
out.flush();
// 定義BufferedReader輸入流來讀取URL的響應
int code = conn.getResponseCode(); 
if(code == 200) {
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
}else{
in = new BufferedReader(new InputStreamReader(conn.getErrorStream()));

}
String line;
while ((line = in.readLine()) != null) {
result += line;
}


} catch (Exception e) {
System.out.println("傳送 POST 請求出現異常！" + e);
e.printStackTrace();
}
// 使用finally塊來關閉輸出流、輸入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}