java动态代理和cglib动态代理 (二)

public class JavaDynProxy implements InvocationHandler{
private Object target;
public Object getProxyInstance(Object target){
this.target = target;
return Proxy.newProxyInstance(target.getClass().getClassLoader(),
target.getClass().getInterfaces(), this);
}

@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
Object result = null;
System.out.println("before target method...");
result = method.invoke(target, args);
System.out.println("after target method...");
return result;
}
}测试：

[java]
package leon.aj.dynproxy.java;

import leon.aj.dynproxy.target.Hello;
import leon.aj.dynproxy.target.HelloImpl;
import leon.aj.dynproxy.target.UserDao;
import leon.aj.dynproxy.target.UserDaoImpl;

public class TestJavaProxy {
public static void main(String[] args) {
JavaDynProxy proxy = new JavaDynProxy();
Hello hello = (Hello)proxy.getProxyInstance(new HelloImpl());
String s = hello.sayHello("Leon");
System.out.println(s);

UserDao userDao = (UserDao) proxy.getProxyInstance(new UserDaoImpl());
userDao.login("Leon", "1234");
System.out.println(userDao.getClass().getName());
}
}

package leon.aj.dynproxy.java;

import leon.aj.dynproxy.target.Hello;
import leon.aj.dynproxy.target.HelloImpl;
import leon.aj.dynproxy.target.UserDao;
import leon.aj.dynproxy.target.UserDaoImpl;

public class TestJavaProxy {
public static void main(String[] args) {
JavaDynProxy proxy = new JavaDynProxy();
Hello hello = (Hello)proxy.getProxyInstance(new HelloImpl());
String s = hello.sayHello("Leon");
System.out.println(s);

UserDao userDao = (UserDao) proxy.getProxyInstance(new UserDaoImpl());
userDao.login("Leon", "1234");
System.out.println(userDao.getClass().getName());
}
}
下面是采用cglib实现的例子：

[java]
package leon.aj.dynproxy.cglib;

import java.lang.reflect.Method;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

public class CglibProxy implements MethodInterceptor {
private Object target;

public Object getProxyInstance(Object target) {
this.target = target;
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(this.target.getClass());
enhancer.setCallback(this); // call back method
return enhancer.create(); // create proxy instance
}

@Override
public Object intercept(Object target, Method method, Object[] args, MethodProxy proxy) throws Throwable {
System.out.println("before target method...");
Object result = proxy.invokeSuper(target, args);
System.out.println("after target method...");
return result;
}
}

package leon.aj.dynproxy.cglib;

import java.lang.reflect.Method;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

public class CglibProxy implements MethodInterceptor {
private Object target;

public Object getProxyInstance(Object target) {
this.target = target;
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(this.target.getClass())