使用URLClassLoader调用外部jar，并执行指定类方法
/** * 加载jar，并得到指定的类 ** @param jarFileName * @param classFullName * @return * @throws MalformedURLException */private Class loadClass(String jarFileName, String classFullName)throws MalformedURLException {//要使用URLClassLoader，因为不是同工程下，同工程下可使用ClassLoaderURLClassLoader classLoader = new URLClassLoader(new URL[] { new URL(jarFileName) });JarFile jarFile = null;Class c = null;try {jarFile = new JarFile(jarFileName.substring(5));} catch (IOException e) {e.printStackTrace();}Enumeration<JarEntry> en = jarFile.entries();while (en.hasMoreElements()) {JarEntry je = en.nextElement();String name = je.getName();String s5 = name.replace('/', '.');if (s5.lastIndexOf(".class") > 0) {String className = je.getName().substring(0, je.getName().length() - ".class".length()).replace('/', '.');if (classFullName.equals(className)) {try {c = classLoader.loadClass(className);System.out.println(className);} catch (ClassNotFoundException e) {System.out.println("NO CLASS: " + className);} catch (NoClassDefFoundError e) {System.out.println("NO CLASS: " + className);}break;}}}return c;}protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {Class clazz = this.loadClass("file:C:" + File.separator + "Main.jar","com.test.Main");System.out.println("开始执行！");// com.test.Main类中的二个方法，为了测试返回值写死，可以得到类中的方法集合String[] me_name = new String[] { "main", "a" };for (int i = 0; i < me_name.length; i++) {try {Method me = clazz.getMethod(me_name,new Class[] { new String[] {}.getClass() });// 方法的返回值,可以给方法加参数Object object = me.invoke(clazz.newInstance(), new Object[] { new String[] { "111111111" } });System.out.println(object);} catch (Exception e) {e.printStackTrace();}}System.out.println("开始js！");}
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