代码生成公钥私钥

import java.security.Key;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.interfaces.RSAPrivateKey;

import java.security.interfaces.RSAPublicKey;

import java.util.HashMap;

import java.util.Map;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

@SuppressWarnings("unused")

public class Keys {

 public static final String KEY_ALGORITHM = "RSA";

 public static final String SIGNATURE_ALGORITHM = "MD5withRSA";

 private static final String PUBLIC_KEY = "RSAPublicKey";

 private static final String PRIVATE_KEY = "RSAPrivateKey";

 public static void main(String[] args) {

  Map<String, Object> keyMap;

  try {

   keyMap = initKey();

   String publicKey = getPublicKey(keyMap);

   System.out.println("===========================publicKey=========================");

   System.out.println(publicKey);

   System.out.println("==============================================================");

   String privateKey = getPrivateKey(keyMap);

   System.out.println("===========================privateKey==========================");

   System.out.println(privateKey);

   System.out.println("================================================================");

  } catch (Exception e) {

   e.printStackTrace();

  }

 }

 public static String getPublicKey(Map<String, Object> keyMap)throws Exception {

  Key key = (Key) keyMap.get(PUBLIC_KEY);

  byte[] publicKey = key.getEncoded();

  return encryptBASE64(key.getEncoded());

 }

 public static String getPrivateKey(Map<String, Object> keyMap)

   throws Exception {

  Key key = (Key) keyMap.get(PRIVATE_KEY);

  byte[] privateKey = key.getEncoded();

  return encryptBASE64(key.getEncoded());

 }

 public static byte[] decryptBASE64(String key) throws Exception {

  return (new BASE64Decoder()).decodeBuffer(key);

 }

 public static String encryptBASE64(byte[] key) throws Exception {

  return (new BASE64Encoder()).encodeBuffer(key);

 }

 public static Map<String, Object> initKey() throws Exception {

  KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);

  keyPairGen.initialize(1024);

  KeyPair keyPair = keyPairGen.generateKeyPair();

  RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();

  RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();

  Map<String, Object> keyMap = new HashMap<String, Object>(2);

  keyMap.put(PUBLIC_KEY, publicKey);

  keyMap.put(PRIVATE_KEY, privateKey);

  return keyMap;

 }

}