//接口
public interface UserService {
public void addUser();
public void updateUser();
public void deleteUser();
}
//實作類
public class UserServiceImpl implements UserService {
@Override
public void addUser() {
// TODO 自動生成的方法存根
System.out.println("add a user");
}
@Override
public void updateUser() {
// TODO 自動生成的方法存根
System.out.println("upadte user");
}
@Override
public void deleteUser() {
// TODO 自動生成的方法存根
System.out.println("delete a user");
}
}
2.1.2、切面類：用于存儲通知MyAspect
public class MyAspect {
public void before() {
System.out.println("before-method");
}
public void after() {
System.out.println("after-method");
}
}
public class UserServiceImpl {
public void addUser() {
System.out.println("add a user");
}
public void updateUser() {
System.out.println("update a user");
}
public void deleteUser() {
System.out.println("delete a user");
}
}
2.2.2、切面類
public class MyAspect {
public void before() {
System.out.println("before-method");
}
public void after() {
System.out.println("after-method");
}
}
public interface UserService {
public void addUser();
public void updateUser();
public void deleteUser();
}
public class UserServiceImpl implements UserService {
@Override
public void addUser() {
System.out.println("add a user");
}
@Override
public void updateUser() {
System.out.println("update a user");
}
@Override
public void deleteUser() {
System.out.println("delete a user");
}
}
4.2、切面類
/*
* 切面類中确定通知，需要實作不同的接口，接口就是規範，進而就确定的方法的名稱
* 采用的是“環繞通知”：需要實作MethodInterceptor接口
* 環繞通知 必須手動的執行目标方法
*/
public class MyAspect implements MethodInterceptor{
@Override
public Object invoke(MethodInvocation mi) throws Throwable {
// TODO 自動生成的方法存根
System.out.println("前");
//手動執行目标方法:相當于通知spring執行目标方法
Object obj = mi.proceed();
System.out.println("後");
return obj;
}
}
4.3、配置檔案
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 建立目标類 -->
<bean id = "userServiceId" class = "test_b_factory_bean.UserServiceImpl"></bean>
<!-- 建立切面類 -->
<bean id = "myAspectId" class = "test_b_factory_bean.MyAspect"></bean>
<!-- 建立代理類
*使用bean FactoryBean，底層調用getObject() 傳回特殊bean
*ProxyFactoryBean用于建立代理工廠bean，生成特殊的代理對象
*再在該bean中配置
*interfaces:确定接口們，通過<array>可以設定多個值，隻有一個值的時候 使用value,值就是接口的全限定名
*target:确定目标類
*interceptorNames:通知切面類的名稱,采用String[] 設定一個值采用的是value，設定多個值采用<array>
*optimize:強制使用cglib
底層機制：如果目标類有接口，采用jdk動态代理
如果沒有接口，采用cglib
如果聲明是optimize = true，無論是否有接口，都采用cglib
-->
<bean id = "proxyUserServiceId" class = "org.springframework.aop.framework.ProxyFactoryBean">
<property name = "interfaces" value = "test_b_factory_bean.UserService"></property>
<property name = "target" ref = "userServiceId"></property>
<property name = "interceptorNames" value = "myAspectId"></property>
<property name = "optimize" value = "true"></property>
</bean>
</beans>
4.4、測試類
public class TestFactoryBean {
@Test
public void demo() {
String xmlPath = "test_b_factory_bean/applicationContext.xml";
ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
//在這裡獲得代理類
UserService userService = applicationContext.getBean("proxyUserServiceId",UserService.class);
userService.addUser();
userService.updateUser();
userService.deleteUser();
}
}
public interface UserService {
public void addUser();
public void updateUser();
public void deleteUser();
}
public class UserServiceImpl implements UserService {
@Override
public void addUser() {
System.out.println("add a user");
}
@Override
public void updateUser() {
System.out.println("update a user");
}
@Override
public void deleteUser() {
System.out.println("delete a user");
}
}
5.2、切面類
public class MyAspect implements MethodInterceptor{
@Override
public Object invoke(MethodInvocation mi) throws Throwable {
// TODO 自動生成的方法存根
System.out.println("************************");
System.out.println("前");
Object obj = mi.proceed();
System.out.println("後");
return obj;
}
}
