Spring aop 简单示例 第一种配置方式
基于xml方式配置
首先将service，dao注册到spring容器,配置一下扫描包
接下来看下service
package com.yangxin.core.service.impl;
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;
import com.yangxin.core.dao.UserDao; import com.yangxin.core.pojo.User; import com.yangxin.core.service.UserService;
@Service public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;
@Override
public void addUser(User user) {
userDao.insertUser(user);
System.out.println("添加成功");
}
@Override
public void deleteUser(String name) {
userDao.deteleUser(name);
System.out.println("删除成功");
}
}
接下来看下切面代码
package com.yangxin.core.transaction;
import org.aspectj.lang.ProceedingJoinPoint;
import com.yangxin.core.pojo.User;
public class TransactionDemo {
//前置通知
public void startTransaction(){
System.out.println("begin transaction ");
}
//后置通知
public void commitTransaction(){
System.out.println("commit transaction ");
}
//环绕通知
public void around(ProceedingJoinPoint joinPoint) throws Throwable{
System.out.println("begin transaction");
joinPoint.proceed();
System.out.println("commit transaction");
}
}
然后看下这个切面在applicationContext.xml中是如何配置的
aop:config <aop:pointcut expression="execution(* com.yangxin.core.service...*(..))" id="p1" />
<aop:aspect ref = "transactionDemo">
<aop:before method="startTransaction" pointcut-ref="p1" />
<aop:after-returning method="commitTransaction" pointcut-ref="p1"/>
</aop:aspect>
</aop:config>
这里没有演示环绕通知
好了，运行测试代码
测试代码如下
@Test public void test1(){ ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring/applicationContext.xml");
UserService userService = applicationContext.getBean(UserService.class);
User user = new User();
user.setAge(19);
user.setName("yangxin");
userService.addUser(user);
userService.deteleUser("yangxin");
}
控制台输出如下
begin transaction
添加成功
commit transaction
begin transaction
删除成功
commit transaction
现在来测试一下环绕通知
修改一下applicationContext.xml中的配置切面那一部分
修改后的代码
aop:config <aop:pointcut expression="execution(* com.yangxin.core.service...*(..))" id="p1" />
<aop:aspect ref = "transactionDemo">
<aop:around method="around" pointcut-ref="p1"/>
</aop:aspect>
</aop:config>
运行测试代码
输出如下
begin transaction 添加成功 commit transaction begin transaction 删除成功 commit transaction
好了，现在贴下如何用注解的方法
贴下基于注解的切面的代码
package com.yangxin.core.transaction;
import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut;
@Aspect public class TransactionDemo2 {
@Pointcut(value="execution(* com.yangxin.core.service.*.*.*(..))")
public void point(){
}
@Before(value="point()")
public void before(){
System.out.println("transaction begin");
}
@AfterReturning(value = "point()")
public void after(){
System.out.println("transaction commit");
}
@Around("point()")
public void around(ProceedingJoinPoint joinPoint) throws Throwable{
System.out.println("transaction begin");
joinPoint.proceed();
System.out.println("transaction commit");
}
}
在applicationContext.xml中配置