根据官方下载：
策略文件（请到官网下载对应的版本， 例如JDK7的下载地址：http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html 下载后解压，可以看到local_policy.jar和US_export_policy.jar以及readme.txt，如果安装了JRE，将两个jar文件放到%JRE_HOME%\lib\security目录下覆盖原来的文件；如果安装了JDK，将两个jar文件放到%JDK_HOME%\jre\lib\security目录下覆盖原来文件
覆盖文件后，使用了 source /etc/profile 重启了 nutzwk 微信收到消息后还是提示 illegal Key Size
java.security.InvalidKeyException: Illegal key size
at javax.crypto.Cipher.checkCryptoPerm(Cipher.java:1039)
at javax.crypto.Cipher.implInit(Cipher.java:805)
at javax.crypto.Cipher.chooseProvider(Cipher.java:864)
at javax.crypto.Cipher.init(Cipher.java:1396)
at javax.crypto.Cipher.init(Cipher.java:1327)
at org.nutz.weixin.repo.com.qq.weixin.mp.aes.WXBizMsgCrypt.decrypt(WXBizMsgCrypt.java:160)
at org.nutz.weixin.repo.com.qq.weixin.mp.aes.WXBizMsgCrypt.decryptMsg(WXBizMsgCrypt.java:264)
at org.nutz.weixin.util.Wxs.handle(Wxs.java:617)
at cn.wizzer.modules.open.wx.WeixinController.msgIn(WeixinController.java:81)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.nutz.mvc.impl.processor.MethodInvokeProcessor.process(MethodInvokeProcessor.java:25)
at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
at org.nutz.mvc.impl.processor.AdaptorProcessor.process(AdaptorProcessor.java:33)
at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
at org.nutz.mvc.impl.processor.ActionFiltersProcessor.process(ActionFiltersProcessor.java:58)
at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
at cn.wizzer.common.processor.XssSqlFilterProcessor.process(XssSqlFilterProcessor.java:35)
at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
at cn.wizzer.common.processor.NutShiroProcessor.process(NutShiroProcessor.java:52)
at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
at org.nutz.mvc.impl.processor.ModuleProcessor.process(ModuleProcessor.java:123)
at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
at org.nutz.mvc.impl.processor.EncodingProcessor.process(EncodingProcessor.java:27)
at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
at org.nutz.mvc.impl.processor.UpdateRequestAttributesProcessor.process(UpdateRequestAttributesProcessor.java:15)
at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
at cn.wizzer.common.processor.GlobalsSettingProcessor.process(GlobalsSettingProcessor.java:37)
@wendal declare -x HISTCONTROL="ignoredups"
declare -x HISTSIZE="100"
declare -x HOME="/root"
declare -x HOSTNAME="*"
declare -x JAVA_HOME="/usr/java/default"
declare -x LANG="en_US.UTF-8"
declare -x LESSOPEN="||/usr/bin/lesspipe.sh %s"
declare -x LOGNAME="root"