public byte[] desCrypto(byte[] datasource,String password) {
try{
SecureRandom random = new SecureRandom();
DESKeySpec desKey = new DESKeySpec(password.getBytes());
//创建一个密匙工厂，然后用它把DESKeySpec转换成
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(desKey);
//Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance("DES");
//用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE,securekey,random);
//现在，获取数据并加密
//正式执行加密操作
return cipher.doFinal(datasource);
}catch(Throwable e){
e.printStackTrace();
}
return null;
}

private byte[] decrypt(byte[] src,String password) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom random = new SecureRandom();
// 创建一个DESKeySpec对象
DESKeySpec desKey = new DESKeySpec(password.getBytes());
// 创建一个密匙工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
// 将DESKeySpec对象转换成SecretKey对象
SecretKey securekey = keyFactory.generateSecret(desKey);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance("DES");
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE,random);
// 真正开始解密操作
return cipher.doFinal(src);
}

//待加密内容
String str = "测试内容";
//密码，长度要是8的倍数
String password = "12345678";
byte[] result = DESCrypto.desCrypto(str.getBytes(),password);
System.out.println("加密后内容为："+new String(result)); //直接将如上内容解密
try {
byte[] decryResult = des.decrypt(result,password);
System.out.println("加密后内容为："+new String(decryResult));
} catch (Exception e1) {
e1.printStackTrace();
}