AES 256 algorithm in Java encounters illegal key size or default parameters wrong solution

Error message:

Caused by: java.security.InvalidKeyException: Illegal key size or default parameters

Cause of the problem:

Java almost every common encryption algorithm can find the corresponding implementation. Due to export restrictions in the United States, Sun has imposed restrictions on access files (Local_policy.jar, Us_export_policy.jar). So there are some problems:
The key length does not meet the requirements (for example: Java.security.InvalidKeyException:Illegal key size or default parameters);
Some algorithms do not support, such as MD4, SHA-224 and other algorithms;
API is not very convenient to use, some of the commonly used conversion aids are not available, such as Base64 encoding conversion, hex encoding conversion tools.
Oracle provides policy-free file access on its official website (Unlimited Strength Jurisdiction policy files), and we can address the limitations by simply deploying it in the JRE environment.

Workaround:

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

JDK8 Jar Package:

Http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html

JDK7 Jar Package:

Http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html

JDK6 Jar Package:

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

Replace the two jar packages: Local_policy.jar and Us_export_policy.jar with the original JDK installation directory C:\Program files\java\jre6\lib\security two jar package.

AES 256 algorithm in Java encounters illegal key size or default parameters wrong solution