import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ConnectException;
import java.net.URL;


import javax.net.ssl.HttpsURLConnection;


public class HttpUtil {
    /**
     * 
     * @呼叫方式String result = sm.httpsRequest("https://api.weixin.qq.com", "POST", json.toString());
     */
    
public String httpsRequest(String requestUrl, String requestMethod, String outputStr){
        try {
            URL url = new URL(requestUrl);
            HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            // 設定請求方式（GET/POST）
            conn.setRequestMethod(requestMethod);
            conn.setRequestProperty("content-type", "application/x-www-form-urlencoded");
            // 當outputStr不為null時向輸出流寫資料
            if (null != outputStr) {
                OutputStream outputStream = conn.getOutputStream();
                // 注意編碼格式
                outputStream.write(outputStr.getBytes("UTF-8"));
                outputStream.close();
            }
            // 從輸入流讀取返回內容
            InputStream inputStream = conn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String str = null;
            StringBuffer buffer = new StringBuffer();
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            // 釋放資源
            bufferedReader.close();
            inputStreamReader.close();
            inputStream.close();
            inputStream = null;
            conn.disconnect();
            return buffer.toString();
        } catch (ConnectException ce) {
            System.out.println("連線超時：{}");
        } catch (Exception e) {
            System.out.println("https請求異常：{}");
        }
        return null;
    }
}