Java(TM) Cryptography Extension Policy Files
for the Java(TM) Platform, Standard Edition Runtime Environment
README
------------------------------------------------------------------------
Import and export control rules on cryptographic software vary from
country to country. The Java Cryptography Extension (JCE) architecture
allows flexible cryptographic key strength to be configured via the
jurisdiction policy files which are referenced by the "crypto.policy"
security property in the <java-home>/conf/security/java.security file.
By default, Java provides two different sets of cryptographic policy
files:
unlimited: These policy files contain no restrictions on cryptographic
strengths or algorithms
limited: These policy files contain more restricted cryptographic
strengths
These files reside in <java-home>/conf/security/policy in the "unlimited"
or "limited" subdirectories respectively.
Each subdirectory contains a complete policy configuration,
and subdirectories can be added/edited/removed to reflect your
import or export control product requirements.
Within a subdirectory, the effective policy is the combined minimum
permissions of the grant statements in the file(s) matching the filename
pattern "default_*.policy". At least one grant is required. For example:
limited = Export (all) + Import (limited) = Limited
unlimited = Export (all) + Import (all) = Unlimited
The effective exemption policy is the combined minimum permissions
of the grant statements in the file(s) matching the filename pattern
"exempt_*.policy". Exemption grants are optional. For example:
limited = grants exemption permissions, by which the
effective policy can be circumvented.
e.g. KeyRecovery/KeyEscrow/KeyWeakening.
Please see the Java Cryptography Architecture (JCA) documentation for
additional information on these files and formats.
YOU ARE ADVISED TO CONSULT YOUR EXPORT/IMPORT CONTROL COUNSEL OR ATTORNEY
TO DETERMINE THE EXACT REQUIREMENTS.
Please note that the JCE for Java SE, including the JCE framework,
cryptographic policy files, and standard JCE providers provided with
the Java SE, have been reviewed and approved for export as mass market
encryption item by the US Bureau of Industry and Security.
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《Alibaba Dragonwell:探索Java开发的高效选择》
Alibaba Dragonwell,这款由阿里巴巴公司推出的免费OpenJDK发行版,已经成为Java开发者们关注的焦点。它不仅为开发者提供了稳定且可靠的Java运行环境,还特别强调了性能优化与长期支持,确保了软件的安全性和稳定性。在本文中,我们将深入探讨Alibaba Dragonwell的核心特性、优势以及如何在Windows系统上安装和使用JDK 17版本。
Alibaba Dragonwell是一款基于OpenJDK的发行版,这意味着它遵循开放源代码的标准,允许社区成员参与开发和改进。这种开放性使得Dragonwell能够不断吸收社区的创新成果,同时也确保了与OpenJDK的兼容性,降低了开发者的学习成本和迁移风险。
对于JDK 17,这是Java的一个长期支持(LTS)版本,意味着它将得到更长时间的维护和安全更新。Alibaba Dragonwell的17.0.11.0.12+9-GA版本,包含了这个LTS版本的诸多改进,旨在提供更好的性能和安全性。其中,“GA”代表“General Availability”,表示该版本已经经过充分测试,适合生产环境使用。
在性能优化方面,Alibaba Dragonwell展现出了卓越的表现。阿里巴巴作为全球领先的技术公司,积累了大量的线上服务运行经验,这些经验被用于Dragonwell的优化之中。例如,它可能包含针对大规模并发、内存管理和垃圾回收的定制优化,以适应云环境和大规模分布式系统的需要。此外,Dragonwell还注重降低延迟,这对于实时性和响应速度要求高的应用尤其重要。
在安全性方面,Dragonwell定期发布安全更新,修复已知漏洞,保护用户的数据安全。对于企业级应用来说,这是一项至关重要的保障。同时,由于其与OpenJDK的紧密关系,Dragonwell能够及时引入社区的安全修复,确保用户始终运行在安全的环境中。
在Windows平台上,安装Alibaba Dragonwell 17.0.11.0.12+9-GA非常简单。只需解压"Alibaba-Dragonwell-Standard-17.0.11.0.12.9-x64-windows.zip"压缩包,将解压后的目录添加到系统PATH环境变量中,然后通过"java -version"命令即可验证安装成功。开发者可以像使用其他JDK版本一样,无缝切换到Dragonwell,进行开发和调试工作。
Alibaba Dragonwell以其高性能、高安全性以及长期支持的特点,成为Java开发者尤其是企业级应用的理想选择。结合Windows平台的广泛使用,它提供了一个强大且稳定的开发和运行环境,助力开发者构建和运行高性能的应用程序。无论是初创公司还是大型企业,都能从中受益,享受到开源技术带来的便利与优势。

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