code: public static RSAKey keyGen(int keySize) {
  
          KeyPairGenerator generator = null;
          try {
              generator = KeyPairGenerator.getInstance(algorithm);
              generator.initialize(keySize);
  
              KeyPair keyPair = generator.generateKeyPair();
  
              return new RSAKey(keyPair.getPublic(), keyPair.getPrivate());
          } catch (NoSuchAlgorithmException e) {
              e.printStackTrace();
          }
  
          return null;
      }
docs: RSA 公密钥对生成
  <p>Function: keyGen</p>
  <p>Description: </p>
  
  @param keySize
  @return Key数组  index = 0 公钥 | index = 1 私钥
  @throws NoSuchAlgorithmException
  @throws FileNotFoundException
  @throws IOException
  @author acexy@thankjava.com
  @date 2016年8月10日 下午5:31:36
  @version 1.0