加载外部类

lxzo123

于 2011-01-21 13:57:00 发布

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CC 4.0 BY-SA版权

文章标签： classloader file url exception class

本文链接：https://blog.youkuaiyun.com/lxzo123/article/details/6156833

本文介绍了一种使用URLClassLoader加载指定目录下外部类的方法，并展示了如何获取该类的所有字段。

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public static void loadClassOuter() throws Exception {
        // 外部类路径
        File file = new File("D://Workspaces//MyEclipse 8.6//workone//Root//WEB-INF//classes");
        try {
            // Convert File to a URL
            URL url = file.toURL();
            URL[] urls = new URL[] { url };

// Create a new class loader with the directory
ClassLoader cl = new URLClassLoader(urls);

            // Load in the class; MyClass.class should be located in
            // the directory file:/c:/myclasses/com/mycompany
            Class cls = cl.loadClass("com.sohu.Node");
            Field[] fields = cls.getDeclaredFields();
            for (Field f : fields) {
                System.out.println(f.getName());
            }
        } catch (MalformedURLException e) {
        } catch (ClassNotFoundException e) {
        }

}