aop学习总结二------使用cglib动态代理简单实现aop功能
模拟业务需求：
1.拦截所有业务方法
2.判断用户是否有权限，有权限就允许用户执行业务方法，无权限不允许用户执行业务方法
（判断是否有权限是根据user是否为null）
CGLIB的代理：目标对象没有实现接口
业务类：
package ql.service.impl;public class PersonServiceBean { private String user=null; public PersonServiceBean(){} public PersonServiceBean(String user){ this.user=user; } public String getUser() { return user; } public void setUser(String user) { this.user = user; } public void save(String name) { System.out.println("我是save()方法"); } public void update(String name, Integer personId) { System.out.println("我是update()方法"); } public String getPersonName(Integer personId) { System.out.println("我是getPersonName()方法"); return "success"; }} CGLIB动态代理工厂类：
package ql.aop;import java.lang.reflect.Method;import net.sf.cglib.proxy.Enhancer;import net.sf.cglib.proxy.MethodInterceptor;import net.sf.cglib.proxy.MethodProxy;import ql.service.impl.PersonServiceBean;public class CGLIBProxyFactory implements MethodInterceptor { // 目标对象 private Object targetObject; // 得到一个代理实例 public Object createProxyIntance(Object targetObject) { this.targetObject = targetObject; // 该类用于生产代理对象 Enhancer enhancer = new Enhancer(); // 继承了目标对象，对目标类的所有非final方法进行覆盖，并加上自己的代码 enhancer.setSuperclass(this.targetObject.getClass()); enhancer.setCallback(this); return enhancer.create(); } public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable { PersonServiceBean bean = (PersonServiceBean) this.targetObject; Object result = null; if (bean.getUser() != null) { result = methodProxy.invoke(targetObject, args); } return result; }}
单元测试类：
package ql.test;import org.junit.Before;import org.junit.Test;import ql.aop.CGLIBProxyFactory;import ql.service.impl.PersonServiceBean;public class ProxyTest { @Before public void setUp() throws Exception { } @Test public void testCGLIBProxyFactory1() { CGLIBProxyFactory cglibProxyFactory=new CGLIBProxyFactory(); PersonServiceBean personServiceBean=(PersonServiceBean) cglibProxyFactory.createProxyIntance(new PersonServiceBean()); personServiceBean.save("小明"); } @Test public void testCGLIBProxyFactory2() { CGLIBProxyFactory cglibProxyFactory=new CGLIBProxyFactory(); PersonServiceBean personServiceBean=(PersonServiceBean) cglibProxyFactory.createProxyIntance(new PersonServiceBean("xxxx")); personServiceBean.save("小明"); }}