BridgeLi's Blog

这两天研究了一下Java的动态代理，自己闲着无聊，用动态代理模拟了一下Spring的AOP，代码如下，当然真正的Spring是直接操作二进制文件，很复杂，有兴趣的可以自己研究下。

package cn.bridgeli.aop;

public interface UserService {
void addUser();
}

package cn.bridgeli.aop;

public class UserServiceImpl implements UserService {

public void addUser() {
System.out.println("User add...");
}

}

package cn.bridgeli.aop;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class UserServiceProxy implements InvocationHandler {

private UserService userService;

public UserServiceProxy(UserService userService) {
this.userService = userService;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
System.out.println("User add start...");
Object object = method.invoke(userService, args);
System.out.println("User add end...");
return object;
}

}

package cn.bridgeli.aop;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

import org.junit.Test;

public class UserServiceTest {
@Test
public void testAddUser() {
UserService userService = new UserServiceImpl();
InvocationHandler invocationHandler = new UserServiceProxy(userService);
UserService userServiceProxy = (UserService) Proxy.newProxyInstance(userService.getClass().getClassLoader(), userService.getClass().getInterfaces(), invocationHandler);
userServiceProxy.addUser();
}
}