jdk9 免安装包，配置环境变量即可

Java(TM) Cryptography Extension Policy Files for the Java(TM) Platform, Standard Edition Runtime Environment README ------------------------------------------------------------------------ The JCE architecture allows flexible cryptographic strength to be configured via the jurisdiction policy files contained within these directories. The default JCE policy files bundled in this Java Runtime Environment allow for "unlimited" cryptographic strengths. For convenience, this build also contains the historic "limited" strength policy files which contain restrictions on cryptographic strengths, but they must be specifically activated by updating the "crypto.policy" Security property (e.g. <java-home>/conf/security/java.security) to point to the appropriate directory. Each subdirectory contains a complete policy configuration, and additional subdirectories can be added/removed to reflect local regulations. JCE for Java SE has been through the U.S. export review process. The JCE framework, along with the various JCE providers that come standard with it (SunJCE, SunEC, SunPKCS11, SunMSCAPI, etc), is exportable from the United States. You are advised to consult your export/import control counsel or attorney to determine the exact requirements of your location, and what policy settings should be used. Please see The Java(TM) Cryptography Architecture (JCA) Reference Guide and the java.security file for more information.