java - 在运行时将包含 java 源的文件夹添加到类路径

Question

是否可以添加一个包含 java 源代码的文件夹作为类路径元素。我已经尝试了一些东西，似乎类加载器没有获取 java 源文件？我的尝试之一如下所示....

File uncompressedSrc = new File("uncompressed" + File.separator + "src" + File.separator);
URL uncompressedSrcURL = null;
try {
    uncompressedSrcURL = new URL("file://"
        + uncompressedSrc.getAbsolutePath());
} catch (MalformedURLException e) {
    e.printStackTrace();
}
URL elements[] = { uncompressedSrcURL };
new URLClassLoader(elements, ClassLoader.getSystemClassLoader());

Answer 1

我找到了解决问题的方法...我使用以下肮脏的“hack”将文件夹添加到类路径...

public static void addUrl(URL u) {
    URLClassLoader sysloader = (URLClassLoader) ClassLoader
            .getSystemClassLoader();
    Class<URLClassLoader> sysclass = URLClassLoader.class;

    try {
        Method method = sysclass.getDeclaredMethod("addURL", parameters);
        method.setAccessible(true);
        method.invoke(sysloader, new Object[] { u });
    } catch (Throwable t) {
        t.printStackTrace();
        try {
            throw new IOException(
                    "Error, could not add URL to system classloader");
        } catch (IOException e) {
            logger.log(Level.SEVERE, e.getMessage());
        }
    }
}