自定义类加载器通常通过继承java.lang.ClassLoader类,重写findClass()方法: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 public class CustomClassLoader extends ClassLoader { @Override public Class findClass(String name) throws ClassNotFoundException { byte[] b = loadClassFromFile(name); return de...
public class Launcher { private static Launcher launcher = new Launcher(); private static String bootClassPath = System.getProperty("sun.boot.class.path"); public static Launcher getLauncher() { return launcher; } private ClassLoader loader; public Launcher() { // Create the extension class loa...
check if the class has already been loaded89Class c =findLoadedClass(name);1011if(c ==null) {1213try{1415if(parent !=null) {1617c = parent.loadClass(name,false);1819}else{2021c = findBootstrapClassOrNull(name);//只有bootstrap会执行这一句2223}2425}catch(ClassNotFoundException e) {2627...
public class Test { public static void main(String[] args) throws Exception { MyClassLoader myClassLoader = new MyClassLoader("D:/test/"); Class<?> clazz = myClassLoader.loadClass("Sample"); Object obj = clazz.newInstance(); obj.getClass().getMethod("sayHello").invoke(obj); obj =...
ClassLoader loader = new NetworkClassLoader(host, port); Object main = loader.loadClass("Main", true).newInstance(); 网络类加载器子类必须定义findClass方法和loadClassData方法来从网络中加载类。 下载组成该类的字节后,应使用defineClass方法创建一个类实例。示例实现如下: class NetworkClassLoader extends ...
String className = "org.classloader.simple.NetClassLoaderSimple"; NetworkClassLoader ncl1 = new NetworkClassLoader(rootUrl); NetworkClassLoader ncl2 = new NetworkClassLoader(rootUrl); Class<?> clazz1 = ncl1.loadClass(className); Class<?> clazz2 = ncl2.loadClass(className); ...
可以看下JDK的ClassLoader类的loadClass方法: protectedClass<?>loadClass(Stringname,booleanresolve)throwsClassNotFoundException{synchronized(getClassLoadingLock(name)){// 检查类是否被加载过Class<?>c=findLoadedClass(name);if(c==null){longt0=System.nanoTime();try{if(parent!=null){// 调用父加载器...
The network class loader subclass must define the methods findClass and loadClassData to load a class from the network. Once it has downloaded the bytes that make up the class, it should use the method defineClass to create a class instance. A sample implementation is: 代码语言:javascript 代...
public class UrlLoader { public static void main(String[] args) throws Exception{ URLClassLoader urlClassLoader = new URLClassLoader(new URL[]{new URL("http://127.0.0.1:9999")}); Class<?> c = urlClassLoader.loadClass("ClassLoad1"); //加载恶意类 c.newInstance(); //类实例化调用 }...
io.File;import java.io.IOException;import java.io.InputStream;public class TestAll { public static void main(String[] args) throws ClassNotFoundException, IllegalAccessException, InstantiationException { ClassLoader classLoader = new ClassLoader() { @Override public Class<?> loadClass(String name)...