使用JAVA实现DES密码加密、解密过程，密钥在程序中能够指定，也可改为用户自己输入-DES implementation using JAVA password encryption, decryption process, the key specified in the procedure can also be changed to the user' s own input

用JAVA语言实现DES算法。通过文件读取进行加密，密码由客户自行输入-JAVA language used DES algorithm. Read through the document is encrypted, the password input by the customer on its own