xml 切面

Author: Romantic-Lei

springBoot3/spring6/spring6-aop/src/main/java/com/luojia/xmlaop/Calculator.java

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+package com.luojia.xmlaop;
+
+public interface Calculator {
+    int add(int i, int j);
+
+    int sub(int i, int j);
+
+    int mul(int i, int j);
+
+    int div(int i, int j);
+}

springBoot3/spring6/spring6-aop/src/main/java/com/luojia/xmlaop/CalculatorImpl.java

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+package com.luojia.xmlaop;
+
+import org.springframework.stereotype.Component;
+
+/**
+ * 最基本的实现类
+ */
+@Component
+public class CalculatorImpl implements Calculator {
+    @Override
+    public int add(int i, int j) {
+        int result = i + j;
+        System.out.println("方法内部 result = " + result);
+        // 模拟异常
+        // int a = 1/0;
+        return result;
+    }
+
+    @Override
+    public int sub(int i, int j) {
+        int result = i - j;
+        System.out.println("方法内部 result = " + result);
+        return result;
+    }
+
+    @Override
+    public int mul(int i, int j) {
+        int result = i * j;
+        System.out.println("方法内部 result = " + result);
+        return result;
+    }
+
+    @Override
+    public int div(int i, int j) {
+        int result = i / j;
+        System.out.println("方法内部 result = " + result);
+        return result;
+    }
+}

springBoot3/spring6/spring6-aop/src/main/java/com/luojia/xmlaop/LogAspect.java

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+package com.luojia.xmlaop;
+
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.*;
+import org.springframework.stereotype.Component;
+
+import java.util.Arrays;
+
+// @Component 注解保证这个切面类能够放入IOC容器
+@Component
+public class LogAspect {
+
+    /**
+     * 前置通知
+     */
+    public void beforeMethod() {
+        System.out.println("LogAspect --> 前置通知");
+    }
+
+    /**
+     * 后置通知
+      */
+    public void afterMethod(JoinPoint joinPoint) {
+        String methodName = joinPoint.getSignature().getName();
+        Object[] args = joinPoint.getArgs();
+        System.out.println("LogAspect --> 后置通知，方法名称：" + methodName + ", 参数：" + Arrays.toString(args));
+    }
+
+    /**
+     *返回通知
+     */
+    public void afterReturningMethod(JoinPoint joinPoint, Object result) {
+        String methodName = joinPoint.getSignature().getName();
+        System.out.println("LogAspect --> 返回通知，方法名称：" + methodName + "， 目标方法返回结果：" + result);
+    }
+
+    /**
+     * 异常通知
+     */
+    @AfterThrowing(value = "execution(* com.luojia.xmlaop.CalculatorImpl.*(..))", throwing = "ex")
+    public void afterThrowingMethod(JoinPoint joinPoint, Throwable ex) {
+        String methodName = joinPoint.getSignature().getName();
+        System.out.println("LogAspect --> 异常通知，方法名称：" + methodName + "， 目标方法返回异常结果：" + ex);
+    }
+
+    /**
+     * 环绕通知
+     */
+    public Object aroundMethod(ProceedingJoinPoint joinPoint) {
+        String methodName = joinPoint.getSignature().getName();
+        Object[] args = joinPoint.getArgs();
+        Object result = null;
+        try {
+            System.out.println("LogAspect --> 环绕通知，目标方法之前执行，方法名：" + methodName + ", 参数：" + Arrays.toString(args));
+            result = joinPoint.proceed();
+
+            System.out.println("环绕通知，目标方法返回值之后执行");
+        } catch (Throwable e) {
+            e.printStackTrace();
+            System.out.println("环绕通知，目标方法出现异常执行");
+        } finally {
+            System.out.println("环绕通知，目标方法执行完毕后执行");
+        }
+        return result;
+    }
+
+    // 重用切入点表达式
+    @Pointcut(value = "execution(* com.luojia.xmlaop.CalculatorImpl.*(..))")
+    public void pointCut() {
+
+    }
+
+}

springBoot3/spring6/spring6-aop/src/main/java/com/luojia/xmlaop/TestAop.java

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+package com.luojia.xmlaop;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+public class TestAop {
+
+    @Test
+    public void testAdd() {
+        ApplicationContext context =
+                new ClassPathXmlApplicationContext("beanxmlaop.xml");
+
+        Calculator calculator = context.getBean(Calculator.class);
+        calculator.add(8, 9);
+    }
+}

springBoot3/spring6/spring6-aop/src/main/resources/beanxmlaop.xml

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+<?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.xsd">
+    <!--
+        基于注解的AOP的实现：
+        1、将目标对象和切面交给IOC容器管理（注解+扫描）
+        2、开启AspectJ的自动代理，为目标对象自动生成代理
+        3、将切面类通过注解@Aspect标识
+    -->
+    <context:component-scan base-package="com.luojia.xmlaop"></context:component-scan>
+
+    <!-- 配置aop的物种通知类型 -->
+    <aop:config>
+        <!-- 配置切面类 -->
+        <aop:aspect ref="logAspect">
+            <!-- 配置切入点 -->
+            <aop:pointcut id="pointcut" expression="execution(* com.luojia.xmlaop.CalculatorImpl.*(..))"/>
+            <!-- 配置五种通知类型 -->
+            <!--前置通知-->
+            <aop:before method="beforeMethod" pointcut-ref="pointcut"></aop:before>
+
+            <!--后置通知-->
+            <aop:after method="afterMethod" pointcut-ref="pointcut"></aop:after>
+
+            <!--返回通知-->
+            <aop:after-returning method="afterReturningMethod" returning="result" pointcut-ref="pointcut"></aop:after-returning>
+
+            <!--异常通知-->
+            <aop:after-throwing method="afterThrowingMethod" throwing="ex" pointcut-ref="pointcut"></aop:after-throwing>
+
+            <!--环绕通知-->
+            <aop:around method="aroundMethod" pointcut-ref="pointcut"></aop:around>
+
+        </aop:aspect>
+    </aop:config>
+
+</beans>
+