1.全注解配置

所需jar包

        <!--mybatis的jar包-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.3</version>
        </dependency>
        <!--數(shù)據(jù)庫連接-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!--spring上下文容器-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!--spring整合jdbc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!--druid連接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.16</version>
        </dependency>
        <!--mybatis整合spring-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
        <!--spring整合JUnit測試-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!--JUnit測試-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!--aspect切面-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
        </dependency>
    </dependencies>

service層接口

public interface UserService {
    public void add();
    public void delete();
    public void update();
    public void find();
}

service層接口的實現(xiàn)類

@Configuration
@Service("userService")
public class UserServiceImpl implements UserService {
    public void add() {
        System.out.println("新增用戶");
    }

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

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

    public void find() {
        System.out.println("查詢用戶");
    }
}

spring的配置類

@Configuration
@ComponentScan("com.*")
@EnableAspectJAutoProxy
public class SpringConfig {}

編寫注解通知順序類

@Component("logAdvice")
@Aspect
public class LogAdvice {
    //切入點-用于將方法插入
    //此方法也可以抽取成父類
    @Pointcut("execution(* com.*.service.impl.*.*(..))")
    public void pt1(){}

    //在插入目標地之前執(zhí)行
    @Before("pt1()")
    public void beforeLog(JoinPoint joinPoint){
        //獲取切入點方法的參數(shù)們
        Object[] args = joinPoint.getArgs();
        System.out.println(Arrays.asList(args));
        //獲取目標對象的類名
        String simpleName = joinPoint.getTarget().getClass().getSimpleName();
        String name = joinPoint.getSignature().getName();
        System.out.println(simpleName+":"+name+"方法執(zhí)行后");
    }

    //在執(zhí)行目標地的方法后執(zhí)行此方法
    @AfterReturning("pt1()")
    public void afterReturningLog(JoinPoint joinPoint){
        //獲取目標對象的類名
        String simpleName = joinPoint.getTarget().getClass().getSimpleName();
        String name = joinPoint.getSignature().getName();
        System.out.println(simpleName+":"+name+"方法執(zhí)行后");
    }

    // 目的地方法正常執(zhí)行后執(zhí)行
    @After("pt1()")
    public void afterLog(JoinPoint joinPoint){
        //獲取目標對象的類名
        String simpleName = joinPoint.getTarget().getClass().getSimpleName();
        String name = joinPoint.getSignature().getName();
        System.out.println(simpleName+":"+name+"方法執(zhí)行結(jié)束");
    }

    //目的地方法執(zhí)行時拋出異常后執(zhí)行
    @AfterThrowing(value = "pt1()",throwing = "e")
    public void afterThrowingLog(JoinPoint joinPoint, Throwable e){
        //獲取目標對象的類名
        String simpleName = joinPoint.getTarget().getClass().getSimpleName();
        //獲取切入點方法名
        String methodName = joinPoint.getSignature().getName();
        System.out.println(simpleName+"的"+methodName+"方法執(zhí)行產(chǎn)生異常后，異常為:"+e.getMessage());
    }

    //環(huán)繞--此方法可以代替其余所有方法
    //其中代碼執(zhí)行的順序有自己指定，順序和try-catch-finally一致
    public Object aroundLog(ProceedingJoinPoint pjp){
        String simpleName = pjp.getTarget().getClass().getSimpleName();
        Signature signature = pjp.getSignature();
        String methodName = signature.getName();
        try {
            // 前置
            System.out.println(simpleName+"的"+methodName+"方法執(zhí)行前");
            Object rtValue = pjp.proceed();
            //后置
            System.out.println(simpleName+"的"+methodName+"方法正常執(zhí)行后");
            return rtValue;
        } catch(Throwable throwable){
            System.out.println("Exception 異常");
            // 異常
            System.out.println(simpleName+"的"+methodName+"方法執(zhí)行產(chǎn)生異常后");
            return null;
        } finally{
            // 最終
            System.out.println(simpleName+"的"+methodName+"方法最終執(zhí)行結(jié)束");
        }
    }
}

2.spring代理

由上述的userServiceImpl舉例

public class UserServiceImlp{
        public void save(){
                System.out.println("水泥墻");
        }
}

提供一個方法，用于指定對象的代理對象

class UserServiceCglibProxy{
//如果你的jdk版本高于1.8這里的實現(xiàn)類不用寫final
    public static UserServiceImpl2 createUserServiceCglibProxy(final UserServiceImpl2 userService){
        UserServiceImpl2 userServiceProxy = (UserServiceImpl2) Enhancer.create(userService.getClass(), new MethodInterceptor() {
            public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
                if (method.getName().equals("save")){
                   //調(diào)用原始的父類方法...
                    Long startTime = 0L;
                    Date date = new Date();
                    startTime = date.getTime();
                    userService.find();
                    Object rtValue = method.invoke(userService, args);
                    Long endTime = date.getTime();
                    System.out.println("阿巴阿巴");
                    System.out.println(endTime-startTime);
                    return rtValue;
                }
                // 其它方法，原封不動的調(diào)用
                return method.invoke(userService, args);
            }
        });
        return userServiceProxy;
    }
}

測試代碼

public static void main(String[] args) {
    UserServiceImpl2 userServiceImpl = new UserServiceImpl2();
    UserServiceImpl2 userService = UserServiceCglibProxy.createUserServiceCglibProxy(userServiceImpl);
    userService.save();
}

切入點表達式

execution(*
execution(*
execution(public
*
execution(public
int
execution(public
void
execution(public
void com..*.*(..))
execution(public
void com..service
execution(public
void com.itheima.service
execution(public
void com.itheima.service.User
execution(public
void com.itheima.service .*
execution(public
void com.itheima.service.UserService
execution(public
User com.itheima.service.UserService.find
execution(public
User com.itheima.service.UserService .*
execution(public
User com.itheima.service.UserService.findById
execution(public
User com.itheima.service.UserService.findById int
execution(public
User com.itheima.service.UserService.findById int,int
execution(public
User com.itheima.service.UserService.findById int
execution(public
User com.itheima.service.UserService.findById int
execution(public
User com.itheima.service.UserService.findById
execution(List
com.itheima.service .* findAll