java中的AES 256算法遇到 Illegal key size or default parameters错的解决办法

报错堆栈如下：

Caused by: java.security.InvalidKeyException:Illegal key size or default parameters    at javax.crypto.Cipher.a(DashoA13*..)~[na:1.6]    at javax.crypto.Cipher.a(DashoA13*..)~[na:1.6]    at javax.crypto.Cipher.a(DashoA13*..)~[na:1.6]    at javax.crypto.Cipher.init(DashoA13*..)~[na:1.6]    at javax.crypto.Cipher.init(DashoA13*..)~[na:1.6]    at my.package.Something.decode(RC4Decoder.java:25)~[my.package.jar:na]

Google到问题原因，链接地址如下：

http://stackoverflow.com/questions/6481627/java-security-illegal-key-size-or-default-parameters

根据回答找到下载新jar包链接地址如下：

http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html

把里面的两个jar包：local_policy.jar 和 US_export_policy.jar 替换掉原来安装目录C:\Program Files\Java\jre6\lib\security 下的两个jar包接可以了

然后就重新运行程序，不会报错了

BTW:

 If ur JVM is IBM JVM pls refer to the below link to update the unlimited key size jars

http://pic.dhe.ibm.com/infocenter/wasinfo/v7r0/index.jsp?topic=%2Fcom.ibm.websphere.nd.multiplatform.doc%2Finfo%2Fae%2Fae%2Ftwbs_tunev6wss.html