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 {

@Override
public void method1() {
System.out.println("TotalInterfaceForStaticImpl method1");
}

@Override
public 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 {

@Override
public void method1() {
System.out.println("TotalInterfaceForDynamicJdkImpl method1");
}

@Override
public 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;
}
@Override
public void method1() {
System.out.println("pre");
delegate.method1();
System.out.println("end");
}
@Override
public 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;
}
@Override
public 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 {

@Override
public 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.