基于JCE的密钥分配-----------------------（二）分布式对称密钥分配

假定A,B通信的共享密钥已经都拥有了发送内容为从工程目录下名为"test-1.txt"的文件读入=========================DECUtil.java，DEC工具类===================package second;import java.security.Key;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;public class DESUtil { /**  * 生成密钥  *   * @return