开发笔记:Spring基础3

package com.ual.dao;
public class GoodsDaoImpl implements GoodsDao {
@Override
public void save() {
System.out.println("保存");
}
@Override
public void update() {
System.out.println("更新");
}
}

package com.ual.Proxy;
import com.ual.dao.GoodsDao;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
public class GoodsJDKProxy {
public GoodsDao createProxy(GoodsDao goodsDao) {
GoodsDao goodsDaoProxy = (GoodsDao) Proxy.newProxyInstance(goodsDao.getClass().getClassLoader(),
goodsDao.getClass().getInterfaces(), new InvocationHandler() {
@Override//当调用对象的时候，所有的方法都会来到这里
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if("save".equals(method.getName())){
System.out.println("保存校验");
return method.invoke(goodsDao, args);//返回的代理对象
}
if("update".equals(method.getName())){
System.out.println("更新校验");//方法执行之前，执行
GoodsDao goodsDao1 = (GoodsDao)method.invoke(goodsDao, args);//返回的代理对象
System.out.println("日志打印");//方法执行之后
return goodsDao1;
}
return method.invoke(goodsDao, args);//返回的代理对象
}
});
return goodsDaoProxy;//返回一个代理对象，代理对象中的方法执行时，会回调匿名内部类中的Invoke方法。
}
}

package com.ual.test;
import com.ual.Proxy.GoodsJDKProxy;
import com.ual.dao.GoodsDao;
import com.ual.dao.GoodsDaoImpl;
import org.junit.Test;
public class GoodsDaoTest {
@Test
public void test() {
GoodsDao goodsDao = new GoodsDaoImpl();
/* goodsDao.save();*/
GoodsJDKProxy goodsJDKProxy = new GoodsJDKProxy();
GoodsDao proxy = goodsJDKProxy.createProxy(goodsDao);
proxy.save();
proxy.update();
}
}

package com.ual.test;
import com.ual.service.UserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class UserTest {
@Autowired
private UserService userService;
@Test
public void test() {
this.userService.delete();
}
}

package com.ual2.demo;
public class Myaspect {
public void check(){
System.out.println("校验");
}
}

<bean id="myaspect" class="com.ual2.demo.Myaspect">bean>

<aop:config>

<aop:pointcut id="pointDelete" expression="execution(* com.ual.dao.UserDaoImpl.delete(..))"/>

<aop:aspect ref="myaspect">
<aop:before method="check" pointcut-ref="pointDelete"/>
aop:aspect>
aop:config>
beans>