支付宝支付服务器如何生成支付订单

从私钥文件中将私钥文件获取出来

BufferedReader mBufferedReader = null;
try {
      FileReader mFileReader = new FileReader(new File("rsa_private_key_pkcs82.pem"));
      mBufferedReader = new BufferedReader(mFileReader);
      StringBuilder sb = new StringBuilder();
      String line = "";
      while (null != (line = mBufferedReader.readLine())) {
      if (!line.startsWith("-----")) {
      sb.append(line);
}
}

privateKey = sb.toString();

} catch (FileNotFoundException e1) {

e1.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

if (null != mBufferedReader) {

try {

mBufferedReader.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}