spring基于xml配置aop入门案例

spring基于xml配置aop入门案例

1、导入jar包

• 基于maven项目

<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.8.14</version>
</dependency>

2、编写实体类

package com.yl.bean;

import java.io.Serializable;

/**
 * 用户实体类
 */
public class User implements Serializable {
    private Integer id;
    private String username;
    private String password;

    public User() {
    }

    public User(Integer id, String username, String password) {
        this.id = id;
        this.username = username;
        this.password = password;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

3、编写业务层

• 业务层接口

package com.yl.service;

/**
 * 用户业务层接口
 */
public interface IUserService {

    /**
     * 查询用户
     */
    public void queryUser();

}

• 业务层接口实现类

package com.yl.service.impl;

import com.yl.dao.IUserDao;
import com.yl.service.IUserService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * 用户业务层接口实现类
 */
@Service("userService")
public class IUserServiceImpl implements IUserService {
    @Resource(name = "userDao")
    private IUserDao iUserDao;//用户持久层对象

    /**
     * 查询用户
     */
    @Override
    public void queryUser() {
//        int i=1/0;
        iUserDao.queryUser();
    }
}

4、编写持久层

• 持久层接口

package com.yl.dao;

/**
 * 用户持久层接口
 */
public interface IUserDao {

    /**
     * 查询用户
     */
    public void queryUser();

}

• 持久层接口实现类

package com.yl.dao.impl;

import com.yl.dao.IUserDao;
import org.springframework.stereotype.Repository;

/**
 * 用户持久层接口实现类
 */
@Repository("userDao")
public class IUserDaoImpl implements IUserDao {

    /**
     * 查询用户
     */
    @Override
    public void queryUser() {
        System.out.println("查询成功");
    }
}

5、编写通知类

package com.yl.inform;

import org.springframework.stereotype.Component;

/**
 * spring通知类
 */
@Component("userInform")
public class UserInform {

    /**
     * 前置通知
     */
    public void beforeInform(){
        System.out.println("开启事务");
    }

    /**
     * 后置通知
     */
    public void afterInform(){
        System.out.println("提交事务");
    }

    /**
     * 异常通知
     */
    public void throwInform(){
        System.out.println("异常通知");
    }

}

6、配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!--aop-->
    <aop:config>
        <!--切面-->
        <aop:aspect id="inform" ref="userInform">
            <!--前置通知-->
            <aop:before method="beforeInform" pointcut-ref="pc"></aop:before>
            <!--后置通知-->
            <aop:after-returning method="afterInform" pointcut-ref="pc"></aop:after-returning>
            <!--异常通知-->
            <aop:after-throwing method="throwInform" pointcut-ref="pc"></aop:after-throwing>
            <!--切入点-->
            <aop:pointcut id="pc" expression="execution(* com.yl.service.impl.IUserServiceImpl.*())"/>
        </aop:aspect>
    </aop:config>

    <!--指定spring要扫描的包-->
    <context:component-scan base-package="com.yl"></context:component-scan>

</beans>

7、测试

package com.yl.ui;

import com.yl.service.IUserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * 测试类
 */
public class MainTest {

    public static void main(String[] args) {
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("bean.xml");

        IUserService userService= (IUserService) applicationContext.getBean("userService");

        userService.queryUser();
    }

}