Spring AOP几种方式的使用-蒲公英云

引入依赖

<spring-version>4.2.3.RELEASE</spring-version>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.11</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>${spring-version}</version>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-beans</artifactId>
    <version>${spring-version}</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>${spring-version}</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>${spring-version}</version>
</dependency>
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjrt</artifactId>
    <version>1.8.8</version>
</dependency>
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.8.8</version>
</dependency>

Service

HelloService.class

public interface HelloService {
    /**
     *  hello method
     */
    void hello(String words);
}

HelloServiceImpl .class

@Service("helloServiceImpl")
public class HelloServiceImpl implements HelloService {
    @Override
    public void hello(String words) {
        System.out.println(words);
        int i = 1 / 0;
    }
}

方式一：使用MethodInterceptor

切面类 LogInterceptor.class

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
/**
 * @author yuyufeng
 * @date 2017/11/14
 */
public class LogInterceptor implements MethodInterceptor {
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        System.out.println("#before");
        Object ret = invocation.proceed();
        System.out.println("#after");
        return ret;
    }
}

XML配置

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    <context:component-scan base-package="learn.service.impl"/>
    <bean id="logInterceptor" class="learn.interceptor.LogInterceptor"></bean>
    <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
        <property name="beanNames">
            <value>*ServiceImpl</value>
        </property>
        <!--强制代理目标类（cglib）-->
        <property name="proxyTargetClass" value="true"/>
        <property name="interceptorNames">
            <list>
                <value>logInterceptor</value>
            </list>
        </property>
    </bean>
</beans>

测试

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"classpath:spring/spring-service.xml"})
public class Demo1 {
    @Autowired
    private HelloService helloService;
    @Test
    public void test() {
        System.out.println("Demo1.test");
    }
    @Test
    public void testHelloService() {
        try{
            helloService.hello("hello 你好~");
        }catch (Exception e){
            System.out.println("出现异常");
        }
    }
}

执行结果

#before
hello 你好~
出现异常

方式二：使用@Aspect方式

配置Aspect类

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
/**
 * @author yuyufeng
 * @date 2017/11/14
 */
@Aspect
public class LogAspect {
    /**
     * 方法前执行
     * @param point
     */
    @Before("execution(* learn.service.impl.*.*(..))")
    public void methodBefore(JoinPoint point) {
        handleMethod(point);
        System.out.println("LogAspect.methodBefore");
    }
    /**
     * 无论方法以何种方式结束，都会执行（类似于finally）
     * @param point
     */
    @After("execution(* learn.service.impl.*.*(..))")
    public void methodAfter(JoinPoint point) {
        System.out.println("LogAspect.methodAfter");
    }
    /**
     * 环绕执行
     * @param proceedingJoinPoint
     * @return
     * @throws Throwable
     */
    @Around(value = "execution(* learn.service.impl.*.*(..))")
    public Object aroundAdvice(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        handleMethod(proceedingJoinPoint);
        //调用核心逻辑
        System.out.println("-----Start of aroundAdvice()-----");
        Object retVal = proceedingJoinPoint.proceed();
        System.out.println("-----End of aroundAdvice()------");
        return retVal;
    }
    /**
     * Throw后执行
     * @param point
     * @param ex
     */
    @AfterThrowing(pointcut = "execution(* learn.service.impl.*.*(..))", throwing = "ex")
    public void doAfterThrowingTask(JoinPoint point,Exception ex) {
        System.out.println(ex.toString());
    }
    /**
     * 运行方法后执行
     * @param joinPoint
     * @param retVal
     */
    @AfterReturning(value = "execution(* learn.service.impl.*.*(..))",returning="retVal")
    public void doAfterReturning(JoinPoint joinPoint,Object retVal){
        System.out.println("LogAspect.doAfterReturning:"+retVal);
    }
    /**
     * 获取方法名称
     *
     * @param joinPoint
     * @return
     * @throws Exception
     */
    public static String handleMethod(JoinPoint joinPoint){
        Class<?> clazz = joinPoint.getTarget().getClass();
        String name = joinPoint.getSignature().getName();
        Object[] parameterTypes = joinPoint.getArgs();
        System.out.println(name);
        for (Object parameterType : parameterTypes) {
            System.out.println("# "+parameterType);
        }
        for (Method method : clazz.getDeclaredMethods()) {
            System.out.println("* "+method.getName());
        }
        return "";
    }
}

XML配置

<?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-4.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    <context:component-scan base-package="learn.service.impl"/>
      <!--强制代理目标类（cglib） proxy-target-class="true"-->
        <aop:aspectj-autoproxy />
        <bean id="logAspect" class="learn.aspect.LogAspect"></bean>
</beans>

运行测试执行类Demo1.class，得到结果

hello
# hello 你好~
* hello
-----Start of aroundAdvice()-----
hello
# hello 你好~
* hello
LogAspect.methodBefore
hello 你好~
LogAspect.methodAfter
java.lang.ArithmeticException: / by zero
出现异常

备注

切入点表达式 execution (* com.sample.service.impl...(..))
整个表达式可以分为五个部分：
1、execution(): 表达式主体。
2、第一个号：表示返回类型，号表示所有的类型。
3、包名：表示需要拦截的包名，后面的两个句点表示当前包和当前包的所有子包，com.sample.service.impl包、子孙包下所有类的方法。
4、第二个号：表示类名，号表示所有的类。
5、(..):最后这个星号表示方法名，号表示所有的方法，后面括弧里面表示方法的参数，两个句点表示任何参数。