java静态代理和动态代理(jdk,cglib)

一.项目结构:

package com.lee;public interface TotalInterface {public void method1();public void method2();}

二.基础接口(实现类).

1.接口

package com.lee;public interface TotalInterface {public void method1();public void method2();}

2.静态代理实现类:

package com.lee;public class TotalInterfaceForStaticImpl implements TotalInterface {@Overridepublic void method1() {System.out.println("TotalInterfaceForStaticImpl method1");}@Overridepublic void method2() {System.out.println("TotalInterfaceForStaticImpl method2");}}

3.动态代理实现类(基于JDK)

package com.lee;public class TotalInterfaceForDynamicJdkImpl implements TotalInterface {@Overridepublic void method1() {System.out.println("TotalInterfaceForDynamicJdkImpl method1");}@Overridepublic void method2() {System.out.println("TotalInterfaceForDynamicJdkImpl method2");}}

4.动态代理实现类(基于cglib),可以不实现任何接口.

package com.lee;public class TotalInterfaceForDynamicCglibmpl {public void method1() {System.out.println("TotalInterfaceForDynamicCglibmpl method1");}public void method2() {System.out.println("TotalInterfaceForDynamicCglibmpl method2");}}

三.创建代理类

1.静态代理类:

package com.lee.staticproxy;import com.lee.TotalInterface;public class OfferProxy implements TotalInterface {private TotalInterface delegate;public OfferProxy(TotalInterface delegate) {this.delegate = delegate;}@Overridepublic void method1() {System.out.println("pre");delegate.method1();System.out.println("end");}@Overridepublic void method2() {System.out.println("pre");delegate.method2();System.out.println("end");}public TotalInterface getDelegate() {return delegate;}public void setDelegate(TotalInterface delegate) {this.delegate = delegate;}}

2.静态代理测试类:

package com.lee.staticproxy;import com.lee.TotalInterface;import com.lee.TotalInterfaceForStaticImpl;public class TestProxy {public static void main(String[] args) {TotalInterface offer=new OfferProxy(new TotalInterfaceForStaticImpl());offer.method1();offer.method2();}}

执行结果:

pre
TotalInterfaceForStaticImpl method1
end
pre
TotalInterfaceForStaticImpl method2
end

3.基于JDK的动态代理

package com.lee.dynamicjdk;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;public class MyInvocationHandler implements InvocationHandler {private Object target;public MyInvocationHandler() {super();}public MyInvocationHandler(Object target) {super();this.target = target;}@Overridepublic Object invoke(Object proxy, Method method, Object[] args)throws Throwable {System.out.println("before "+method.getName());Object result = method.invoke(target, args);System.out.println("after "+method.getName());return result;}}

4.测试类

package com.lee.dynamicjdk;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Proxy;import com.lee.TotalInterface;import com.lee.TotalInterfaceForDynamicJdkImpl;public class InvocationHandlerTest {public static void main(String[] args) {TotalInterface ioffer =new TotalInterfaceForDynamicJdkImpl();//被代理类.委托类.InvocationHandler invocationHandler=new MyInvocationHandler(ioffer);TotalInterface iofferProxy=(TotalInterface)Proxy.newProxyInstance(ioffer.getClass().getClassLoader(), ioffer.getClass().getInterfaces(), invocationHandler);//代理iofferProxy.method1();iofferProxy.method2();}}

执行结果

before method1
TotalInterfaceForDynamicJdkImpl method1
after method1
before method2
TotalInterfaceForDynamicJdkImpl method2
after method2
5.cglib 代理类

package com.lee.dynamiccglib;import java.lang.reflect.Method;import net.sf.cglib.proxy.MethodInterceptor;import net.sf.cglib.proxy.MethodProxy;public class CglibProxy implements MethodInterceptor {@Overridepublic Object intercept(Object o, Method method, Object[] args,MethodProxy methodProxy) throws Throwable {System.out.println("before"+methodProxy.getSuperName());System.out.println(method.getName());Object result=methodProxy.invokeSuper(o, args);System.out.println("after"+methodProxy.getSuperName());return result;}}

6.cglib测试类

package com.lee.dynamiccglib;import com.lee.TotalInterfaceForDynamicCglibmpl;import net.sf.cglib.proxy.Enhancer;public class CglibProxytest {public static void main(String[] args) {CglibProxy cglibProxy=new CglibProxy();Enhancer en=new Enhancer();en.setSuperclass(TotalInterfaceForDynamicCglibmpl.class);en.setCallback(cglibProxy);TotalInterfaceForDynamicCglibmpl ioffer=(TotalInterfaceForDynamicCglibmpl)en.create();ioffer.method1();ioffer.method2();}}

执行结果

beforeCGLIB$method1$0
method1
TotalInterfaceForDynamicCglibmpl method1
afterCGLIB$method1$0
beforeCGLIB$method2$1
method2
TotalInterfaceForDynamicCglibmpl method2
afterCGLIB$method2$1

后续详解.