在Java运行时为本机库添加新路径

[此解决方案不适用于Java 10+]

没有一点黑客（即访问ClassLoader类的私有字段）似乎是不可能的

该博客提供了两种方法。

作为记录，这是简短版本。

选项1： 用新值完全替换java.library.path）

public static void setLibraryPath(String path) throws Exception {    System.setProperty("java.library.path", path);    //set sys_paths to null so that java.library.path will be reevalueted next time it is needed    final Field sysPathsField = ClassLoader.class.getDeclaredField("sys_paths");    sysPathsField.setAccessible(true);    sysPathsField.set(null, null);}

选项2： 向当前java.library.path添加新路径

public static void addLibraryPath(String pathToAdd) throws Exception{    final Field usrPathsField = ClassLoader.class.getDeclaredField("usr_paths");    usrPathsField.setAccessible(true);    //get array of paths    final String[] paths = (String[])usrPathsField.get(null);    //check if the path to add is already present    for(String path : paths) {        if(path.equals(pathToAdd)) { return;        }    }    //add the new path    final String[] newPaths = Arrays.copyOf(paths, paths.length + 1);    newPaths[newPaths.length-1] = pathToAdd;    usrPathsField.set(null, newPaths);}