Spring基于XML的AOP 开发
步骤:
1. 导入 AOP 相关坐标
2. 创建目标接口和目标类(内部有切点)
3. 创建切面类(内部有增强方法)
4. 将目标类和切面类的对象创建权交给 spring
5. 在 applicationContext.xml 中配置织入关系
6. 测试代码
导入 AOP 相关坐标
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.4</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
</dependencies>
创建目标接口和目标类
//自己写接口就一个save方法
package com.code_g.aop;
public class Target implements TargetInterface{
@Override
public void save() {
System.out.println("save data...");
}
}
创建切面类
package com.code_g.aop;
import org.aspectj.lang.ProceedingJoinPoint;
public class MyAspect {
public void before(){
System.out.println("前置增强");
}
public void after_returning(){
System.out.println("后置方法");
}
public Object around(ProceedingJoinPoint point) throws Throwable {
System.out.println("环绕的前置增强。。。");
Object proceed = point.proceed();
System.out.println("环绕的后置增强。。。");
return proceed;
}
public void exception(){
System.out.println("异常抛出增强...");
}
public void after(){
System.out.println("最终增强...");
}
}
将目标类和切面类的对象创建权交给 spring
在 applicationContext.xml 中配置织入关系
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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 http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
">
<!-- 目标对象-->
<bean id="target" class="com.code_g.aop.Target"/>
<!-- 切面对象-->
<bean id="myAspect" class="com.code_g.aop.MyAspect"/>
<!-- 配置织入-->
<aop:config>
<!-- 声明切面-->
<aop:aspect ref="myAspect">
<!-- 抽取切点表达式-->
<aop:pointcut id="cut1" expression="execution(* com.code_g.aop.*.*(..))"/>
<!-- 切面:切点+增强方法-->
<!-- 前置增强-->
<aop:before method="before" pointcut="execution(* com.code_g.aop.*.*(..))"/>
<!-- 后置增强-->
<aop:after-returning method="after_returning" pointcut="execution(* com.code_g.aop.*.*(..))"/>
<!-- 环绕增强-->
<aop:around method="around" pointcut="execution(* com.code_g.aop.*.*(..))"/>
<!-- 异常抛出增强-->
<aop:after-throwing method="exception" pointcut="execution(* com.code_g.aop.*.*(..))"/>
<!-- 最终增强-->
<aop:after method="after" pointcut="execution(* com.code_g.aop.*.*(..))"/>
<aop:around method="around" pointcut-ref="cut1"/>
<aop:after method="after" pointcut-ref="cut1"/>
</aop:aspect>
</aop:config>
</beans>
junit测试类
package com.code_g.test;
import com.code_g.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:applicationContext.xml")
public class AopTest {
@Autowired
private TargetInterface target;
@Test
public void test1(){
target.save();
}
}
Spring的AOP增强方法的几种类型
1. 前置
2. 后置
3. 环绕
4. 异常
5. 最终
// 配置文件中已经测试