spring 注解 AOP

1.MAVEN工程下的pom.xml配置
这是一次比较全的配置，后面将不会在写这个配置。

<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/maven-v4_0_0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>com.***</groupId>    <artifactId>spring</artifactId>    <packaging>war</packaging>    <version>0.0.1-SNAPSHOT</version>    <name>spring Maven Webapp</name>    <url>http://maven.apache.org</url>    <dependencies>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>4.12</version>            <scope>test</scope>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>javax.servlet-api</artifactId>            <version>3.1.0</version>            <scope>provided</scope>        </dependency>        <dependency>            <groupId>commons-logging</groupId>            <artifactId>commons-logging</artifactId>            <version>1.1.3</version>        </dependency>        <dependency>            <groupId>org.slf4j</groupId>            <artifactId>slf4j-api</artifactId>            <version>1.7.21</version>        </dependency>        <dependency>            <groupId>org.slf4j</groupId>            <artifactId>slf4j-log4j12</artifactId>            <version>1.7.21</version>        </dependency>        <dependency>            <groupId>javax</groupId>            <artifactId>javaee-api</artifactId>            <version>7.0</version>            <scope>provided</scope>        </dependency>        <!-- jsp标签库 -->        <dependency>            <groupId>org.glassfish.web</groupId>            <artifactId>javax.servlet.jsp.jstl</artifactId>            <version>1.2.2</version>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>jstl</artifactId>            <version>1.2</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-core</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-beans</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-tx</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context-support</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-web</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-webmvc</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-aop</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-aspects</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jdbc</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>        <dependency>            <groupId>c3p0</groupId>            <artifactId>c3p0</artifactId>            <version>0.9.1.2</version>        </dependency>        <dependency>            <groupId>com.mchange</groupId>            <artifactId>mchange-commons-java</artifactId>            <version>0.2.12</version>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>5.1.25</version>        </dependency>    </dependencies>    <build>        <finalName>spring</finalName>    </build></project>

2.log4j配置

# For JBoss: Avoid to setup Log4J outside $JBOSS_HOME/server/default/deploy/log4j.xml!# For all other servers: Comment out the Log4J listener in web.xml to activate Log4J.log4j.rootLogger=INFO, stdout, logfilelog4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%nlog4j.appender.logfile=org.apache.log4j.RollingFileAppenderlog4j.appender.logfile.File=logs/my.loglog4j.appender.logfile.MaxFileSize=512KB# Keep three backup files.log4j.appender.logfile.MaxBackupIndex=3# Pattern to output: date priority [category] - messagelog4j.appender.logfile.layout=org.apache.log4j.PatternLayoutlog4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n

3.在applicationContext.xml中添加配置 注解 自动扫描包

    <aop:aspectj-autoproxy/>    <context:annotation-config/>    <context:component-scan base-package="com.***"/>

4.接口IMessageService

public interface IMessageService {    public String getInfo();    public boolean remove(String mid);}

5.接口IMessageService的实现类MessageServiceImpl

@Component("messageServiceImpl")public class MessageServiceImpl implements IMessageService {@Override    public String getInfo() {        return null;    }    @Override    public boolean remove(String mid) {        Logger.getLogger(IMessageService.class).info("删除id:"+mid);//      Dept dept = null;//      dept.getDname();        return false;    }}

6.定义描述AOP程序处理的结构类

@Aspect@Componentpublic class ServiceProxy {    @Before(value="execution(* com.***..service..*.*(..))")    public void beforeDelete(){        Logger.getLogger(ServiceProxy.class).info("删除前执行操作");    }    @After(value="execution(* com.***..service..*.*(..))")    public void afterDelete(){        Logger.getLogger(ServiceProxy.class).info("删除后执行操作");    }    @Before(value="execution(* com.***..service..*.*(..)) and args(id)",argNames="id")    public void beforeInvoke(Object arg){        Logger.getLogger(ServiceProxy.class).info("业务层执行前调用，参数内容："+arg);    }    @Around(value="execution(* com.***..service..*.*(..))")    public Object arroundInvoke(ProceedingJoinPoint point) throws Throwable{        Logger.getLogger(ServiceProxy.class).info("Around执行参数："+Arrays.toString(point.getArgs()));        Object obj = point.proceed(new Object[]{"java,spring"});        Logger.getLogger(ServiceProxy.class).info("返回结果："+obj);        return true;    }    @AfterReturning(value="execution(* com.***..service..*.*(..))",returning="v",argNames="v")    public void returnInvoke(Object val){        Logger.getLogger(ServiceProxy.class).info("return返回值="+val);    }//环绕通知在所有具体方法通知之前都会自动先执行    @AfterThrowing(value="execution(* com.***..service..*.*(..))",throwing="e",argNames="e")    public void throwInvoke(Exception e){        Logger.getLogger(ServiceProxy.class).error("抛出异常："+e);    }}

7.测试类

public class TestMessageService {    private static ApplicationContext ctx = null;    static{//静态代码块优先于所有的代码块，目的是为了静态属性初始化        ctx = new ClassPathXmlApplicationContext("applicationContext.xml");    }    @Test    public void testGetInfo() {        IMessageService msgService = ctx.getBean("messageServiceImpl",IMessageService.class);        Logger.getLogger(TestMessageService.class).info(msgService.remove("90"));   }}

8.运行结果
当有异常出现时 MessageServiceImpl 执行结果：
Around执行参数：[90]
删除前执行操作
业务层执行前调用，参数内容：java,spring
删除id:java,spring
删除后执行操作
抛出异常：java.lang.NullPointerException

没有异常时
Around执行参数：[90]
删除前执行操作
业务层执行前调用，参数内容：java,spring
删除id:java,spring
返回结果：false
删除后执行操作
return返回值=true
true

9.总结

aop的advice有哪些
1)before:在执行切入的方法之前，执行代码
2)after returning:在执行切入的方法正常执行(没有异常)之后，执行代码
3)after throwing:在执行切入的方法发生异常的时候，执行代码
4)after:在执行切入的方法无论是否发生异常，都必须最后执行代码
5)around:相当于before和after returning的组合