Spring AOP代理增强是什么？一文带你搞懂切面编程

public class MyBeforeAdvice implements MethodBeforeAdvicel
@override
public void before(Method arg0，Object[] arg1,Object arg2) throws Throwable {
System.out.println("this is MyBeforeAdvice");
}
public class MyBeforeAdvice implements MethodBeforeAdvice{
@Override
public void before(Method arg0，Object[] arg1,Object arg2)throws Throwable {
//获取目标方法名称
String method = argo.getName(;
System.out.println("the method : " +method);
//获取目标方法参数的实参
for(int i=0;i<arg1. length;i++)i
System.out.println("the arg1 : "+arg1[i]);
}
/获取目标类
System.out.println("the arg2 : "+arg2.getClass());
System.out.println("this is MyBeforeAdvice");

<!--增强功能–->
<bean id="myBeforeAdvice" class="com.gxy .aop.MyBeforeAdvice"></bean>

<!--AOP配置–->
<aop:config>
4
<aop:pointcut expression="execution(*com.gxy. service.*.*(..))" id="myPointCut"/>
3`5'
12
<aop:advisor advice-ref="myBeforeAdvice" pointcut-ref="myPointCut"/>
</aop:config>
package com.gxy.service; 2
import java.io.IOException;
public interface ProductService {
3
//商品展示
5
public List<Product> selectAll()throws IOException;

public class MyBeforeAdvice implements MethodBeforeAdvice{
@Override
public void before(Method arg0,Object[] arg1,Object arg2) throws Throwable {
/获取目标方法名称
String method = argo.getName();
System.out.println("the method: "+method);
/获取目标方法参数的实参列表
for(int i=0;i<arg1.length;i++)i
System.out.println("the arg1: "+arg1[i]);
}
//获取目标实现类的类路径
System.out.println("the arg2: "+arg2.getClass());
system.out.println("this is MyBeforeAdvice");
}

public class MyAfterAdvice implements AfterReturningAdvice{
@Override
public void afterReturning(Object arg0，Method argl，Object[] arg2,Object arg3)throws Throwable {
//获取反参参数的类型
system.out.println("the argo: "+argo.getClass());
/获取目标方法名称
system.out.println("the arg1 : "+arg1.getName());
获取目标方法多数的实参列表
for(int i=o;i<arg2.length;i++）
System.out.println("the arg2: "+arg2[i]);
)
广获取目标实现类的类路径
System.out.println("the arg3:"+arg3.getClass();
System.out.println("this is afterReturning advice");

public class MyThrowsAdvice implements ThrowsAdvice{
public void afterThrowing(Method method,0bject[] args,Object target,Exception ex){
.System.out.println(target+"里面的"+method.getName()+"产生了"+ex.getMessage());

public class MyInterceptor implements MethodInterceptor{
@override
public Object invoke(MethodInvocation argo)throws Throwable {
System.out.println("this is my interceptor");
//获取目标实现类对象
System.out.println("arg0.getThis()"+arg0.getThis().getClass().toString());
//获取目标方法名称
System.out.println("argo.getMethod() : "+arg0.getMethod().getName());
/获取目标方法参数的实参列表
Object[]arguments = argo.getArguments();
for(int i=O;i<arguments.length;i++)il
System.out.println("argo.getArguments() : "+arguments[i]);
}
7/由于启动了环绕增强，目标类的方法将不会被执行，而被.proceed取代，并返回目标类的反参
//执行目标方法
Object object = argo.proceed();
return object;

public @interface AnnotationLog {
//软接口

<aop:pointcut expression="@annotation(com.gxy.aop.AnnotationLog)" id="myPointCut"/>