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2022-12-19
Spring AOP的五种通知方式代码实例
这篇文章主要介绍了Spring AOP的五种通知方式代码实例,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
AOP的五种通知方式:
前置通知:在我们执行目标方法之前运行(@Before)
后置通知:在我们目标方法运行结束之后,不管有没有异常(@After)
返回通知:在我们的目标方法正常返回值后运行(@AfterReturning)
异常通知:在我们的目标方法出现异常后运行(@AfterThrowing)
环绕通知:目标方法的调用由环绕通知决定,即你可以决定是否调用目标方法,joinPoint.procced()就是执行目标方法的代码 。环绕通知可以控制返回对象(@Around)
一、导jar包
com.springsource.net.sf.cglib-2.2.0.jar
com.springsource.org.aopalliance-1.0.0.jar
com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
commons-logging-1.1.3.jar
spring-aop-4.0.0.RELEASE.jar
spring-aspects-4.0.0.RELEASE.jar
spring-beans-4.0.0.RELEASE.jar
spring-context-4.0.0.RELEASE.jar
spring-core-4.0.0.RELEASE.jar
spring-expression-4.0.0.RELEASE.jar
spring-jdbc-4.0.0.RELEASE.jar
spring-orm-4.0.0.RELEASE.jar
spring-tx-4.0.0.RELEASE.jar
spring-web-4.0.0.RELEASE.jar
spring-webmvc-4.0.0.RELEASE.jar
二、在类路径下建applicationContext.xml配置文件
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:aop="http://springframework.org/schema/aop" xmlns:context="http://springframework.org/schema/context" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-3.0.xsd http://springframework.org/schema/aop http://springframework.org/schema/aop/spring-aop-3.0.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context-3.0.xsd">
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xmlns:aop="http://springframework.org/schema/aop"
xmlns:context="http://springframework.org/schema/context"
xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-3.0.xsd
http://springframework.org/schema/aop http://springframework.org/schema/aop/spring-aop-3.0.xsd
http://springframework.org/schema/context http://springframework.org/schema/context/spring-context-3.0.xsd">
三、接口
//接口
public interface ArithmeticCalculator {
int add(int i, int j);
int sub(int i, int j);
int mul(int i, int j);
int div(int i, int j);
}
四、实现类
package com.atguigu.spring.aop;
import org.springframework.stereotype.Component;
/**
* @Author 谢军帅
* @Date2019/12/6 21:23
* @Description
*/
//实现类
@Component("arithmeticCalculator")
public class ArithmeticCalculatorImpl implements ArithmeticCalculator {
@Override
public int add(int i, int j) {
int relust = i+j;
return relust;
}
@Override
public int sub(int i, int j) {
int relust = i-j;
return relust;
}
@Override
public int mul(int i, int j) {
int relust = i*j;
return relust;
}
@Override
public int div(int i, int j) {
int relust = i/j;
return relust;
}
}
五、定义切面类
package com.atguigu.spring.aop;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
import java.util.Arrays;
/**
* @Author 谢军帅
* @Date2019/12/11 11:17
* @Description
*/
@Component
@Aspect
public class LoggingAspect {
/**
* 在每一个接口的实现类的每一个方法开始之前执行一段代码
*/
@Before("execution(public int com.atguigu.spring.aop.ArithmeticCalculator.* (..))")
public void beforeMethod(JoinPoint joinPoint){
String methodName = joinPoint.getSignature().getName();
Object[] args = joinPoint.getArgs();
System.out.println("The method "+methodName+" begins with "+ Arrays.asList(args));
}
@After("execution(public int com.atguigu.spring.aop.ArithmeticCalculator.* (..))")
public void afterMethod(JoinPoint joinPoint){
String methodName = joinPoint.getSignature().getName();
System.out.println("The method "+methodName +" end......");
}
/**
* 返回通知
* 在方法正常结束后执行的代码
* 返回通知是可以访问方法的返回值的!
* @param joinPoint*/
@AfterReturning(value = "execution(public int com.atguigu.spring.aop.ArithmeticCalculator.* (..))",
returning = "result")
public void afterReturning(JoinPoint joinPoint,Object result){
String methodName = joinPoint.getSignature().getName();
System.out.println("The method "+methodName +" end......result:"+result);
}
/**
* 在目标方法出现异常时会执行的代码
* 可以访问到异常对象,且可以指定在出现特定异常时在执行通知代码
* @param joinPoint
* @param ex*/
@AfterThrowing(value = "execution(public int com.atguigu.spring.aop.ArithmeticCalculator.* (..))", throwing = "ex")
public void afterThrowing(JoinPoint joinPoint, Exception ex){
String methodName = joinPoint.getSignature().getName();
System.out.println("The method "+methodName +"occurs exception :" +ex);
}
/**
* 环绕通知需要携带 ProceedingJoinPoint 类型的参数
* 环绕通知类似于动态代理的全过程:ProceedingJoinPoint 类型的参数可以决定是否执行目标方法。
* 且环绕通知必须有返回值,返回值即为目标方法的返回值
* @param proceedingJoinPoint
*/
/*@Around("execution(public int com.atguigu.spring.aop.ArithmeticCalculator.* (..))")
public Object aroundMethod(ProceedingJoinPoint proceedingJoinPoint){
Object result = null;
String methodName = proceedingJoinPoint.getSignature().getName();
try {
//前置通知
System.out.println("The method "+methodName+" begins with "+Arrays.asList(proceedingJoinPoint.getArgs()));
//执行目标方法
result = proceedingJoinPoint.proceed();
//返回通知
System.out.println("The method ends with "+result);
} catch (Throwable e) {
//异常通知
System.out.println("The method occurs exception:"+e);
throw new RuntimeException(e);
}
//后置通知
System.out.println("The method "+methodName+" ends........");
return result;
}*/
}
六、测试
public class Test_aop {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
ArithmeticCalculator arithmeticCalculator = (ArithmeticCalculator) context.getBean("arithmeticCalculator");
System.out.println(arithmeticCalculator.getClass().getName());
int result = arithmeticCalculator.add(1,2);
System.out.println("result:"+result);
result = arithmetihttp://cCalculator.div(200,0);
System.out.println("result:"+result);
}
}
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