sun.misc.Launcher Java Examples

public static void main(String[] args) {
        // 启动类加载器默认的加载的类的路径
        System.out.println(System.getProperty("sun.boot.class.path"));
        // 扩展类加载器默认的加载的类的路径
        System.out.println(System.getProperty("java.ext.dirs"));
        // 系统类加载器默认的加载的类的路径
        System.out.println(System.getProperty("java.class.path"));

        System.out.println(ClassLoader.class.getClassLoader());
        // 上一行的运行结果是 null

        System.out.println(Launcher.class.getClassLoader());
        // 上一行的运行结果是 null
        // 因为AppClassLoader和ExtClassLoader是位于Launcher内的静态内部类，既然Launcher类是由启动类加载器加载，
        // 那么AppClassLoader和ExtClassLoader也是由启动类加载器所加载。

        System.out.println("---------------------------");

        // 下面的代码和运行方式是 用来说明 自定义系统类加载器 的方法
        System.out.println(System.getProperty("java.system.class.loader"));
        // 上一行的运行结果是 null。 说明默认情况下，java.system.class.loader 没有被定义
        //
        // 在 MyTest16中追加 只有ClassLoader类型的参数的构造函数
        // public MyTest16(ClassLoader parent) {
        //        super(parent);
        //    }
        // 运行命令 java -Djava.system.class.loader=zy.jvm.classloader.MyTest16 zy.jvm.classloader.MyTest18
        // 指定了哪个类作为系统类加载器
        /*
zy.jvm.classloader.MyTest16
         */
        System.out.println(MyTest18.class.getClassLoader());
        // IDEA直接运行和像上面一样用java命令运行，上一行的运行结果是 sun.misc.Launcher$AppClassLoader@135fbaa4。
        System.out.println(MyTest16.class.getClassLoader());
        // IDEA直接运行和像上面一样用java命令运行，上一行的运行结果是 sun.misc.Launcher$AppClassLoader@135fbaa4。
        System.out.println(ClassLoader.getSystemClassLoader());
        // IDEA直接运行，上一行的运行结果是 sun.misc.Launcher$AppClassLoader@135fbaa4。
        // 像上面一样用java命令运行的结果是 zy.jvm.classloader.MyTest16@4e25154f

    }
 

static void loadRule() {
    final String path = "rule";
    final File jarFile = new File(Rule.class.getProtectionDomain().getCodeSource().getLocation().getPath());

    if(jarFile.isFile()) {  // Run with JAR file
        try {
            final JarFile jar = new JarFile(jarFile);
            final Enumeration<JarEntry> entries = jar.entries(); //gives ALL entries in jar
            while(entries.hasMoreElements()) {
                final String name = entries.nextElement().getName();
                if (name.startsWith(path + "/")) { //filter according to the path
                    logger.debug(name);
                }
            }
            jar.close();
        } catch (Exception e) {
            logger.error("Exception:", e);
        }
    } else { // Run with IDE
        final URL url = Launcher.class.getResource("/" + path);
        if (url != null) {
            try {
                final File apps = new File(url.toURI());
                for (File app : apps.listFiles()) {
                    logger.debug(app.getAbsolutePath());
                }
            } catch (URISyntaxException ex) {
                // never happens
            }
        }
    }
}
 

public void test(String path) throws Exception {
    final File jarFile = getJarFile(null);

    if(jarFile.isFile()) {  // Run with JAR file
        final JarFile jar = new JarFile(jarFile);
        final Enumeration<JarEntry> entries = jar.entries(); //gives ALL entries in jar
        while(entries.hasMoreElements()) {
            final String name = entries.nextElement().getName();
            if (name.startsWith(path + "/")) { //filter according to the path
                System.out.println(name);
            }
        }
        jar.close();
    } else { // Run with IDE
        final URL url = Launcher.class.getResource("/" + path);
        if (url != null) {
            try {
                final File apps = new File(url.toURI());
                for (File app : apps.listFiles()) {
                    System.out.println(app);
                }
            } catch (URISyntaxException e) {
                e.printStackTrace();
            }
        }
    }
}
 

public static ClazzLoader createBootstrapClassLoader() {
    URLClassPath cp = Launcher.getBootstrapClassPath();
    return new UrlClazzLoader(BOOTSTRAP_CLASS_LOADER, "N/A", cp.getURLs());
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

private static URLClassPath getBootstrapClassPath() {
    return Launcher.getBootstrapClassPath();
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}
 

static boolean shouldUseOpaqueButtons() {
    final ClassLoader launcherClassLoader = Launcher.getLauncher().getClassLoader();
    if (classExists(launcherClassLoader, "com.installshield.wizard.platform.macosx.MacOSXUtils")) return true;
    return false;
}