Spring AOP 实例

方式一：xml配置文件实现

BaseDao.java

package com.guo.dao;

public interface BaseDao {

    public void insert();

    public void delete();

    public void update();

    public void select();

}

OptLogger.java

package com.guo.dao;

public class OptLogger {

    public void myBefore() {
        System.out.println("before ...");
    }

}

UserDao.java

package com.guo.dao;

public class UserDao implements BaseDao {

    public void insert() {
        System.out.println("insert()");
    }

    public void delete() {
        System.out.println("delete()");
    }

    public void update() {
        System.out.println("update()");
    }

    public void select() {
        System.out.println("select()");
    }

}

applicationContext.xml

<?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:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">

    <bean id="userDao" class="com.guo.dao.UserDao"></bean>
    <bean id="optLogger" class="com.guo.dao.OptLogger"></bean>

    <aop:config>
        <aop:aspect ref="optLogger">
            <aop:before method="myBefore" pointcut="execution(* com.guo.dao.UserDao.*(..))" />
        </aop:aspect>
    </aop:config>

</beans>

UserDaoTest.java

package com.guo.test;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.guo.dao.BaseDao;
import com.guo.dao.UserDao;

public class UserDaoTest {
    public ApplicationContext context;

    @Before
    public void init() {
        context = new ClassPathXmlApplicationContext("applicationContext.xml");
    }

    @Test
    public void test1() {
        System.out.println("--------------无参构造实例化-----------------");
        BaseDao userDao = context.getBean("userDao", BaseDao.class); // aop 有效
        userDao.insert();

        BaseDao userDao1 = (BaseDao) context.getBean("userDao");// aop 有效
        userDao1.delete();

        UserDao userDao2 = (UserDao) context.getBean("userDao");// aop 无效
        userDao2.update();

        BaseDao userDao3 = context.getBean("userDao", UserDao.class);// aop 无效
        userDao3.delete();

        UserDao userDao4 = context.getBean("userDao", UserDao.class);// aop 无效
        userDao4.update();

        System.out.println("end");
    }

}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.guo</groupId>
    <artifactId>maven-spring-aop</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>
        <!-- junit单元测试 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.2.0.RELEASE</version>
            <scope>test</scope>
        </dependency>

        <!-- spring IOC -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>

        <!-- spring AOP -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.5.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-source-plugin</artifactId>
                <version>3.0.1</version>
                <executions>
                    <execution>
                        <id>attach-sources</id>
                        <goals>
                            <goal>jar</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

方式二：注解方法实现

只需修改方式一中的两个文件：

OptLogger.java

package com.guo.dao;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect
public class OptLogger {

    @Before("execution(* com.guo.dao.UserDao.*(..))")
    public void myBefore() {
        System.out.println("before ...");
    }

}

applicationContext.xml

<?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:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">

    <bean id="userDao" class="com.guo.dao.UserDao"></bean>
    <bean id="optLogger" class="com.guo.dao.OptLogger"></bean>

    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>

</beans>