JAVA生成RSA密匙对

public static void generateKeyPair() throws Exception {

    KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
    keyPairGenerator.initialize(KEYSIZE);
    KeyPair keyPair = keyPairGenerator.genKeyPair();

    Key pub = keyPair.getPublic();
    Key pri = keyPair.getPrivate();

    String publicKey = new BASE64Encoder().encode(pub.getEncoded());
    String privateKey = new BASE64Encoder().encode(pri.getEncoded());
    System.out.println("-----BEGIN PUBLIC KEY-----");
    System.out.println(publicKey);
    System.out.println("-----END PUBLIC KEY-----\n");
    System.out.println("-----BEGIN PRIVATE KEY-----");
    System.out.println(privateKey);
    System.out.println("-----END PRIVATE KEY-----");

}