spring AOP (使用AspectJ的xml方式 的aop实现) (7)
2024-08-27 10:18:48
一、定义计算器接口跟实现类
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);
}
public class ArithmeticCalculatorImpl implements ArithmeticCalculator {
@Override
public int add(int i, int j) {
int result = i + j;
return result;
}
@Override
public int sub(int i, int j) {
int result = i - j;
return result;
}
@Override
public int mul(int i, int j) {
int result = i * j;
return result;
}
@Override
public int div(int i, int j) {
int result = i / j;
return result;
}
}
二、定义两个切面，日志切面和验证切面
- 日志:
package com.hp.spring.aop.xml;
import java.util.Arrays;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
public class LoggingAspect {
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));
}
public void afterMethod(JoinPoint joinPoint){
String methodName = joinPoint.getSignature().getName();
System.out.println("The method " + methodName + " ends");
}
public void afterReturning(JoinPoint joinPoint, Object result){
String methodName = joinPoint.getSignature().getName();
System.out.println("The method " + methodName + " ends with " + result);
}
public void afterThrowing(JoinPoint joinPoint, Exception e){
String methodName = joinPoint.getSignature().getName();
System.out.println("The method " + methodName + " occurs excetion:" + e);
}
public Object aroundMethod(ProceedingJoinPoint pjd){
Object result = null;
String methodName = pjd.getSignature().getName();
try {
//前置通知
System.out.println("The method " + methodName + " begins with " + Arrays.asList(pjd.getArgs()));
//执行目标方法
result = pjd.proceed();
//返回通知
System.out.println("The method " + methodName + " ends with " + result);
} catch (Throwable e) {
//异常通知
System.out.println("The method " + methodName + " occurs exception:" + e);
throw new RuntimeException(e);
}
//后置通知
System.out.println("The method " + methodName + " ends");
return result;
}
}
- 验证:
package com.hp.spring.aop.xml;
import java.util.Arrays;
import org.aspectj.lang.JoinPoint;
public class VlidationAspect {
public void validateArgs(JoinPoint joinPoint){
System.out.println("-->validate:" + Arrays.asList(joinPoint.getArgs()));
}
}
三、在xml中配置切面
<?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: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-4.0.xsd">
<!-- 配置 bean -->
<bean id="arithmeticCalculator"
class="com.hp.spring.aop.xml.ArithmeticCalculatorImpl"></bean>
<!-- 配置切面的 bean. -->
<bean id="loggingAspect"
class="com.hp.spring.aop.xml.LoggingAspect"></bean>
<bean id="vlidationAspect"
class="com.hp.spring.aop.xml.VlidationAspect"></bean>
<!-- 配置 AOP -->
<aop:config>
<!-- 配置切点表达式 -->
<aop:pointcut expression="execution(* com.hp.spring.aop.xml.ArithmeticCalculator.*(..))"
id="pointcut"/>
<!-- 配置切面及通知 -->
<aop:aspect ref="loggingAspect" order="2">
<aop:before method="beforeMethod" pointcut-ref="pointcut"/>
<aop:after method="afterMethod" pointcut-ref="pointcut"/>
<aop:after-throwing method="afterThrowing" pointcut-ref="pointcut" throwing="e"/>
<aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="result"/>
<!--
<aop:around method="aroundMethod" pointcut-ref="pointcut"/>
-->
</aop:aspect>
<aop:aspect ref="vlidationAspect" order="1">
<aop:before method="validateArgs" pointcut-ref="pointcut"/>
</aop:aspect>
</aop:config>
</beans>
四、测试类
package com.hp.spring.aop.xml;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-aspectj-xml.xml");
ArithmeticCalculator arithmeticCalculator = (ArithmeticCalculator) ctx.getBean("arithmeticCalculator");
System.out.println(arithmeticCalculator.getClass().getName());
int result = arithmeticCalculator.add(1, 2);
System.out.println("result:" + result);
result = arithmeticCalculator.div(1000, 0);//这里故意除以0 让程序出错，让切面得到异常通知
System.out.println("result:" + result);
}
}
打印出：
com.sun.proxy.$Proxy2
-->validate:[1, 2]
The method add begins with [1, 2]
The method add ends
The method add ends with 3
result:3
-->validate:[1000, 0]
The method div begins with [1000, 0]
The method div ends
The method div occurs excetion:java.lang.ArithmeticException: / by zero
Exception in thread "main" java.lang.ArithmeticException: / by zero
at com.hp.spring.aop.xml.ArithmeticCalculatorImpl.div(ArithmeticCalculatorImpl.java:25)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
...
整个系列项目代码： http://git.oschina.net/nmc5/spring
最新文章
- [LeetCode] Number of Segments in a String 字符串中的分段数量
- go：多核并行化问题
- LINQ系列：Linq to Object分区操作符
- thinkPHP--SQL连贯操作
- ProgressDialog使用总结
- CSS之border
- Fatal error: Call to undefined function imagettftext()解决办法
- WPF 最大化最小化窗口
- linux中django+apache配置
- 第十二篇、高度自适应的textView
- MyEclipseアンロックの手順
- spring AOP 代理机制、执行过程、四种实现方式及示例详解
- [css]《css揭秘》学习（三）-灵活的背景定位
- 360浏览器不能打开CSDN登陆页面
- hbase hbck命令
- 7.SpringBoot 之 Web
- MongoDB--编译文件
- Java 10 - Java Character类
- 简单的socket编程
- Sql Server2005 Transact-SQL 新兵器学习总结之-排名函数