从JAR文件外部加载资源文件

With maven I'm building an application which has to load a driver dynamically. With the following code it only works if the driver.so is positioned inside the resulting JAR file. What can I do that the file can be found outside of the JAR within the path ./natives/driver.so.

使用maven我正在构建一个必须动态加载驱动程序的应用程序。使用以下代码,仅当driver.so位于生成的JAR文件中时才有效。我该怎么办才能在路径./natives/driver.so中找到JAR之外的文件。

package com.myproject;

public class Starter {
    public static void main(String[] args) {
        File classpathRoot = new File(Starter.class.getClassLoader().getResource("driver.so").getPath());
        System.out.println(classpathRoot);
    }
}

Output when driver is positioned inside JAR is:

驱动程序位于JAR内部时的输出是:

jar:file:/home/ted/java/myproject/target/myproject-0.1-SNAPSHOT.jar!/libgdx64.so

Output when positioned outside JAR (in target as well as in target/natives directory) is:

位于JAR外部(目标以及目标/本地目录中)的输出是:

null

I start the application via:

我通过以下方式启动申请:

cd /home/ted/java/myproject/target/
java -Djava.library.path=./natives -cp myproject-0.1-SNAPSHOT.jar com.myproject.Starter

What can I do?

我能做什么?

1 个解决方案

#1

Try this:

package com.myproject;

public class Starter {
    public static void main(String[] args) {
        File file = new File("natives/driver.so");
        System.out.println(file);
    }
}

or this:

package com.myproject;

public class Starter {
    public static void main(String[] args) {
        File file = new File(System.getProperty("java.library.path"), "driver.so");
        System.out.println(file);
    }
}