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的字符串 * @param key 密钥 * @return */ public static String decrypt(String str,String key) { if (str == null || key == null) return null; Cipher cipher; try { cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); //参数分别代表 算法名称/加密模式/数据填充方式 注意：必须是这种形式，否则报错 javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8")); //这里要使用utf-8编码，否则转出来加密信息不一致。此处的key也可以用其他字符编码如GBK、GB2312 后期根据实际情况决定 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); //实例化Des加密方法 此步骤如果省略的话，会出现java.security.InvalidKeyException: No installed provider supports this key: javax.crypto.spec.DESKeySpec异常 cipher.init(Cipher