spring 中 AOP切面编程实例

pom.xml

@@ -12,6 +12,7 @@
         <module>spring_annotation</module>
         <module>springMvc</module>
         <module>spring_test</module>
+        <module>spring_aop</module>
     </modules>
 
     <properties>

spring_aop/pom.xml

@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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">
+    <parent>
+        <artifactId>spring_demo</artifactId>
+        <groupId>org.example</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>spring_aop</artifactId>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.aspectj</groupId>
+            <artifactId>aspectjweaver</artifactId>
+            <version>1.9.6</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <version>5.3.6</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.1</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+
+</project>

spring_aop/src/main/java/com/AopTest.java

@@ -0,0 +1,21 @@
+package com;
+
+
+import com.aop.TargetInterface;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration("classpath:context.xml")
+public class AopTest {
+
+    @Autowired
+    private TargetInterface targetInterface;
+    @Test
+    public void test() {
+        targetInterface.save2();
+    }
+}

spring_aop/src/main/java/com/aop/MyAspect.java

@@ -0,0 +1,33 @@
+package com.aop;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+
+public class MyAspect {
+    public void myBefore() {
+        System.out.println("aspect before...");
+    }
+    // 最终增强
+    public void after() {
+        System.out.println("aspect after...");
+    }
+
+    /**
+     * 环绕方法
+     * @param proceedingJoinPoint 正在执行的连接点 -》切点
+     */
+    public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
+        System.out.println("环绕前增强...");
+        // 切点方法
+        Object proceed = proceedingJoinPoint.proceed();
+        System.out.println("环绕后增强...");
+        return proceed;
+    }
+
+    /**
+     * 异常增强（在抛出异常时执行）
+     */
+    public void afterThrowing() {
+        System.out.println("异常抛出增强...");
+
+    }
+}

spring_aop/src/main/java/com/aop/TargetImpl.java

@@ -0,0 +1,19 @@
+package com.aop;
+
+public class TargetImpl implements TargetInterface{
+    @Override
+    public void save() {
+        System.out.println("target save");
+    }
+
+    @Override
+    public void save2() {
+        System.out.println("target save2");
+        int i = 1/0;
+    }
+
+    @Override
+    public void throwException() {
+
+    }
+}

spring_aop/src/main/java/com/aop/TargetInterface.java

@@ -0,0 +1,8 @@
+package com.aop;
+
+public interface TargetInterface {
+    void save();
+    void save2();
+    void throwException();
+
+}

spring_aop/src/main/resources/context.xml

@@ -0,0 +1,35 @@
+<?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/aop
+       https://www.springframework.org/schema/aop/spring-aop.xsd
+       http://www.springframework.org/schema/context
+       https://www.springframework.org/schema/context/spring-context.xsd
+
+    ">
+<!--       1、配置目标对象 2、配置切面对象 3、配置织入告诉Spring 哪些方法（切点）需要增强 -->
+    <bean id="target" class="com.aop.TargetImpl"></bean>
+    <bean id="myaspect" class="com.aop.MyAspect">
+    </bean>
+    <aop:config>
+        <!-- 声明切面-->
+        <aop:aspect ref="myaspect">
+            <!-- 切点 +通知 前置 后置 -->
+<!--            <aop:before method="myBefore"-->
+<!--                        pointcut="execution(void com.aop.TargetImpl.*())"-->
+<!--            />-->
+<!--            <aop:after method="after"-->
+<!--                        pointcut="execution(public void com.aop.TargetImpl.save())"-->
+<!--            />-->
+            <aop:pointcut id="save2" expression="execution(public void com.aop.TargetImpl.save2())"/>
+            <aop:around method="around" pointcut-ref="save2" />
+            <aop:after-throwing method="afterThrowing"  pointcut-ref="save2" />
+            <aop:after method="after" pointcut-ref="save2" />
+        </aop:aspect>
+    </aop:config>
+</beans>