从类路径加载本机库 [英] Load Native Library from Class path

问题描述

我的项目设置遵循标准目录布局（不使用Maven）：

I have a project setup that follows the Standard Directory Layout (not using Maven though):

src/main
      | java
      | resources
         | library.dll

原生DLL位于资源文件夹和java文件夹中的源。 resources文件夹是Java类路径的成员。

Native DLLs are located in the resources folder and sources in the java folder. The resources folder is a member of the Java class path.

我现在想加载DLL而不必设置JRE -Djava。 library.path 选项或设置 PATH 变量，这样只需双击即可启动生成的jar文件。

I would now like to load a DLL without having to set the JRE -Djava.library.path option or setting the PATH variable so the resulting jar file can be started with a simple double click.

是否可以将资源文件夹添加到库搜索路径，而无需在运行jar文件时进行其他配置？
例如设置类似于清单中的 Class-Path ？

Is it possible to add the resource folder to the library search path without having to do additional configuration when running the jar file? E.g. with a setting similar to the Class-Path in the Manifest?

推荐答案

有一个旧的hack仍然可以在今天（1.7.0_55和1.8.0_05）工作，允许你使用System.setProperty（）进行
a运行时更新，并使
为JVM注意到变化。通常，您执行以下操作：

There is an old-time hack that still works as of today ( 1.7.0_55 & 1.8.0_05 ) to allow you to do to a runtime update using System.setProperty() and have the JVM notice the change. In general, you do the following:

System.setProperty("java.library.path", yourPath);
Field sysPath = ClassLoader.class.getDeclaredField( "sys_paths" );
sysPath.setAccessible( true );
sysPath.set( null, null );
System.loadLibrary(libraryName);

Google java sys_paths 并查找有关此技术的文章。

Google java sys_paths and look for articles about this technique.

注意处理错误/异常。
根据需要恢复原始路径。

Take care to handle errors/exceptions. Restore original paths as needed.

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