基于接口和基于子类的动态代理

一：基于接口（JDK1.3之后提供）：

import com.aiitec.service.IAccountService;import com.aiitec.utils.TransactionManager;

import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.stereotype.Component;

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

public class AccountServiceFactory {    @Autowired    @Qualifier("accountService")    private IAccountService service;//被代理对象，必须实现至少一个接口

    @Autowired    private TransactionManager transactionManager;//事务控制器

　　

/** * 获取代理对象 * @return */

    public IAccountService getProxy() {        return (IAccountService) Proxy.newProxyInstance(service.getClass().getClassLoader(), service.getClass().getInterfaces(), new InvocationHandler() {            @Override            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {                Object result=null;                try{                    transactionManager.beginTransaction();                    System.out.println("前置通知生效。。。");

                    result=method.invoke(service,args);

                    transactionManager.commit();                    System.out.println("后置通知生效。。。");                }catch (Exception e){                    transactionManager.rollback();                    System.out.println("异常通知生效。。。");                    throw new RuntimeException(e);                }finally {                    transactionManager.relese();                    System.out.println("最终通知生效。。。");                }                return result;            }        });    }}

配置spring的IOC：

<!--配置基于接口的动态代理对象，工厂方法创建--><bean id="serviceProxy" factory-bean="accountServiceFactory" factory-method="getProxy"></bean>

<bean id="accountServiceFactory" class="com.aiitec.proxy.AccountServiceFactory"></bean>

使用：

    @Autowired    @Qualifier("serviceProxy")    private IAccountService ccountService;

一：基于子类（第三方Cglib提供）：先导包

<!--cglib基于子类的动态代理--><dependency>  <groupId>cglib</groupId>  <artifactId>cglib</artifactId>  <version>2.1_3</version></dependency>

import com.aiitec.service.impl.AccountServiceCglib;import com.aiitec.utils.TransactionManager;import net.sf.cglib.proxy.Enhancer;import net.sf.cglib.proxy.MethodInterceptor;import net.sf.cglib.proxy.MethodProxy;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

public class AccountServiceCglibFactory {    @Autowired    private AccountServiceCglib accountServiceCglib;//被代理对象，必须不是final类

    @Autowired    private TransactionManager transactionManager;

/** * 获取代理对象 * @return */

    public AccountServiceCglib getProxy() {        return (AccountServiceCglib) Enhancer.create(accountServiceCglib.getClass(), new MethodInterceptor() {            @Override            public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {                Object result=null;                try{                    transactionManager.beginTransaction();                    System.out.println("cglib前置通知生效。。。");                    result=method.invoke(accountServiceCglib,args);                    transactionManager.commit();                    System.out.println("cglib后置通知生效。。。");                }catch (Exception e){                    transactionManager.rollback();                    System.out.println("cglib异常通知生效。。。");                    throw new RuntimeException(e);                }finally {                    transactionManager.relese();                    System.out.println("cglib最终通知生效。。。");                }                return result;            }        });    }}

配置spring的IOC：

<!--配置基于子类的动态代理对象，工厂方法创建-->

<bean id="serviceCglib" factory-bean="accountCglibFactory" factory-method="getProxy"></bean><bean id="accountCglibFactory" class="com.aiitec.proxy.AccountServiceCglibFactory"></bean>

使用：

@Autowired@Qualifier("serviceCglib")private AccountServiceCglib serviceCglibProxy;

原文地址：https://www.cnblogs.com/zou-rong/p/12001345.html