本文深入探讨 JavaNativeAccess (JNA)，一种允许 Java 程序直接调用原生共享库的功能，无需编写 JNI 或原生代码。JNA 提供了类似 Windows Platform/Invoke 和 Python ctypes 的功能，通过简单的 Java 方法调用即可访问原生功能。它利用小型 JNI 库动态调用原生代码，并且具备平台库和实用接口，简化了对原生访问的操作。本文介绍了如何使用 JNA，包括配置、功能和已预映射的原生函数，以及其在不同 Linux 类似平台上构建和使用的可能性。
Java Native Access (JNA)
JNA provides Java programs easy access to native shared libraries without writing anything but Java code - no JNI or native code is required. This functionality is comparable to Windows' Platform/Invoke and Python's ctypes.
JNA allows you to call directly into native functions using natural Java method invocation. The Java call looks just like the call does in native code. Most calls require no special handling or configuration; no boilerplate or generated code is required.
JNA uses a small JNI library stub to dynamically invoke native code. The developer uses a Java interface to describe functions and structures in the target native library. This makes it quite easy to take advantage of native platform features without incurring the high overhead of configuring and building JNI code for multiple platforms.
In addition, JNA includes a platform library with many native functions already mapped as well as a set of utility interfaces that simplify native access. JNA will build on most linux-like platforms with a reasonable set of GNU tools and a JDK. See the native Makefile for native configurations that have been built and tested. If your platform is supported by libffi, then chances are you can build JNA for it.
libffi
A Portable Foreign Function Interface Library.
libffi-3.2.1 was released on November 12, 2014.
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