package com.cncounter.util.comm; import java.security.Key; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class DESUtils {  // 密钥  private static Key key;  // KEY种子  private static String KEY_STR = "encrypt@cncounter.com";  // 常量  public static final String UTF_8 = "UTF-8";  public static final String DES = "DES";  // 静态初始化  static{   try {    // KEY 生成器    KeyGenerator generator = KeyGenerator.getInstance(DES);    // 初始化,安全随机算子    generator.init(new SecureRandom( KEY_STR.getBytes(UTF_8) ));    // 生成密钥    key = generator.generateKey();    generator = null;   } catch (Exception e) {    throw new RuntimeException(e);   }  }  /**   * 对源字符串加密,返回 BASE64编码后的加密字符串   * @param source 源字符串,明文   * @return 密文字符串   */  public static String encode(String source){   try {    // 根据编码格式获取字节数组    byte[] sourceBytes = source.getBytes(UTF_8);    // DES 加密模式    Cipher cipher = Cipher.getInstance(DES);    cipher.init(Cipher.ENCRYPT_MODE, key);    // 加密后的字节数组    byte[] encryptSourceBytes = cipher.doFinal(sourceBytes);    // Base64编码器    BASE64Encoder base64Encoder = new BASE64Encoder();    return base64Encoder.encode(encryptSourceBytes);   } catch (Exception e) {    // throw 也算是一种 return 路径    throw new RuntimeException(e);   }  }  /**   * 对本工具类 encode() 方法加密后的字符串进行解码/解密   * @param encrypted 被加密过的字符串,即密文   * @return 明文字符串   */  public static String decode(String encrypted){   // Base64解码器   BASE64Decoder base64Decoder = new BASE64Decoder();   try {    // 先进行base64解码    byte[] cryptedBytes = base64Decoder.decodeBuffer(encrypted);    // DES 解密模式    Cipher cipher = Cipher.getInstance(DES);    cipher.init(Cipher.DECRYPT_MODE, key);    // 解码后的字节数组    byte[] decryptStrBytes = cipher.doFinal(cryptedBytes);    // 采用给定编码格式将字节数组变成字符串    return new String(decryptStrBytes, UTF_8);   } catch (Exception e) {    // 这种形式确实适合处理工具类    throw new RuntimeException(e);   }  }  // 单元测试  public static void main(String[] args) {   // 需要加密的字符串   String email = "renfufei@qq.com";   // 加密   String encrypted = DESUtils.encode(email);   // 解密   String decrypted = DESUtils.decode(encrypted);   // 输出结果;   System.out.println("email: " + email);   System.out.println("encrypted: " + encrypted);   System.out.println("decrypted: " + decrypted);   System.out.println("email.equals(decrypted): " + email.equals(decrypted));  } }