当要实现AOP的类没有接口是使用CGLIB实现AOP;如果要实现的AOP类有接口则使用JDK中的Proxy
CGLIG实现AOP举例
PersonServiceImpl.java
package com.aop.service.impl;
public class PersonServiceImpl{
private String user = null;
public PersonServiceImpl() {
}
public PersonServiceImpl(String user){
this.user = user;
}
public String getUser() {
return user;
}
public void save() {
System.out.println("save()");
}
public void update() {
System.out.println("update()");
}
}
CGLibProxyFactory.java
package com.aop.factory;
import java.lang.reflect.Method;
import com.aop.service.impl.PersonServiceImpl;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
public class CGLibProxyFactory implements MethodInterceptor{
private Object targetObject;
public Object createProxyInstance(Object targetObject){
this.targetObject = targetObject;
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(this.targetObject.getClass());
enhancer.setCallback(this);
return enhancer.create();
}
@Override
public Object intercept(Object proxy, Method method, Object[] args,
MethodProxy methodProxy) throws Throwable {
PersonServiceImpl service = (PersonServiceImpl) this.targetObject;
Object result = null;
if(service.getUser() != null){
result = method.invoke(targetObject, args);
}
return result;
}
}
测试类:AOPTest.java
package com.aop.junit;
import com.aop.factory.CGLibProxyFactory;
import com.aop.service.impl.PersonServiceImpl;
public class AOPTest {
public static void main(String[] args) {
CGLibProxyFactory cgFactory = new CGLibProxyFactory();
PersonServiceImpl serviceImpl = (PersonServiceImpl) cgFactory.createProxyInstance(new PersonServiceImpl("aaaa"));
serviceImpl.update();
}
}