URLClassLoader加载jar包

//Test类:package com.classloader.test;public class Test {public static void main(String[] args) {try {MyClassLoader.test("file:G:/javaBY/TEST/FBY.jar","com.fby.test.Test");} catch (Exception ex) {ex.printStackTrace();}}}//加载器类package com.classloader.test;import java.lang.reflect.Method;import java.net.URL;import java.net.URLClassLoader;public class MyClassLoader extends URLClassLoader {public MyClassLoader(URL url) {super(new URL[] { url });}public static void test(String str, String cls) throws Exception {URL url = new URL(str);MyClassLoader t = new MyClassLoader(url);Class<?> claz = t.findClass(cls);Method[] methods = claz.getDeclaredMethods();if (methods != null) {for (int i = 0; i < methods.length; i++) {if ("main".equals(methods[i].getName())) {methods[i].invoke(claz, (Object) new String[] {});break;}}}}}