AES加密异常处理 InvalidAlgorithmParameterException：expected IV length of 16 but was 32
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java.security.InvalidAlgorithmParameterException: expected IV length of 16 but was 32.
大概的意思是：无效的算法参数异常：期望的阈值是16但是给的是32
注意到当前密码长度是32的，而我生成的密码配置是128bit（java int占4位，既32个整型）
那么既然要求长度16密码，生成密码的配置就是16x4=64bit。
这就简单了，处理如图生成秘钥的配置改成64bit：
ps：我这边AES加密配置的规则是“AES/CBC/PKCS5PADDING”，不知道是不是这里的规则导致对密码阈值的要求，知道的可以告知我下，非常感谢！ye.jg@qq.com
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