JDK和CGLIB動(dòng)態(tài)代理是Java編程中經(jīng)常使用的兩種代理方式，它們都有助于簡(jiǎn)化代碼和提高應(yīng)用程序的靈活性。

JDK動(dòng)態(tài)代理是Java標(biāo)準(zhǔn)庫的一部分，它使用Java Reflection API在運(yùn)行時(shí)生成代理對(duì)象。代理對(duì)象的實(shí)現(xiàn)由Java編譯器或者JVM自動(dòng)生成，無需手動(dòng)編寫代理類。

interface Subject {
void request();
}
class RealSubject implements Subject {
public void request() {
System.out.println("RealSubject");
}
}
class ProxyHandler implements InvocationHandler {
private Object target;
public ProxyHandler(Object target) {
this.target = target;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Object result = null;
// do something before
result = method.invoke(target, args);
// do something after
return result;
}
}
class Test {
public static void main(String[] args) {
Subject realSubject = new RealSubject();
InvocationHandler handler = new ProxyHandler(realSubject);
Subject proxy = (Subject) Proxy.newProxyInstance(realSubject.getClass().getClassLoader(),
realSubject.getClass().getInterfaces(),
handler);
proxy.request(); // RealSubject
}
}

CGLIB動(dòng)態(tài)代理是一個(gè)第三方工具包，它通過生成代理類的方式實(shí)現(xiàn)代理。與JDK動(dòng)態(tài)代理不同，CGLIB動(dòng)態(tài)代理可以代理非接口類型的類。

class RealSubject {
public void request() {
System.out.println("RealSubject");
}
}
class ProxyHandler implements MethodInterceptor {
private Object target;
public ProxyHandler(Object target) {
this.target = target;
}
public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
Object result = null;
// do something before
result = proxy.invoke(target, args);
// do something after
return result;
}
}
class Test {
public static void main(String[] args) {
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(RealSubject.class);
enhancer.setCallback(new ProxyHandler(new RealSubject()));
RealSubject proxy = (RealSubject) enhancer.create();
proxy.request(); // RealSubject
}
}

總的來說，JDK動(dòng)態(tài)代理適用于代理接口類型的類，使用簡(jiǎn)單方便；CGLIB動(dòng)態(tài)代理適用于代理非接口類型的類，功能更加強(qiáng)大。在實(shí)際開發(fā)中，應(yīng)根據(jù)具體情況選擇合適的代理方式。