##一、前程提要
《基于注解方式配置SpringAOP》文章已经出炉，需要等同学可以通过超链接进行查看，由于使用注解方式配置SpringAOP在开发中时主流，所以关于SpringAOP的知识都放在那篇文章，这篇文章只会简单地介绍下基于XML方式配置SpringAOP。
##二、代码演示
###1.新建一个名为top.cheungchingyin.spring.aop.xml的包
###2.创建一个名为ArithmeticCalculator的接口
package top.cheungchingyin.spring.aop.xml;
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);
}
###3.创建一个名为ArithmeticCalculatorImpl的类，实现ArithmeticCalculator接口
package top.cheungchingyin.spring.aop.xml;
import org.springframework.stereotype.Component;
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;
}
}
###4.创建切面类LoggingAspect
package top.cheungchingyin.spring.aop.xml;
import java.util.Arrays;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
public class LoggingAspect {
public void declareJoinPointExpression() {
}
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 with");
}
public void afterReturningMethod(JoinPoint joinPoint, Object result) {
String methodName = joinPoint.getSignature().getName();
System.out.println("The Method " + methodName + " ends with " + result);
}
public void afterThrowing(JoinPoint joinPoint, Exception ex) {
String methodName = joinPoint.getSignature().getName();
System.out.println("The Method " + methodName + " occurs with " + ex);
}
public Object arroundMethod(ProceedingJoinPoint pjd) {
Object result = null;
String methodName = pjd.getSignature().getName();
// 执行目标方法
try {
// 前置通知
System.out.println("【Around】The method 【" + methodName + "】 begins with" + Arrays.asList(pjd.getArgs()));
result = pjd.proceed();
// 后置通知
System.out.println("【Around】The Method " + " ends with 【" + result + "】");
} catch (Throwable e) {
// 异常通知
System.out.println("The method occurs exception" + e);
}
// 后置通知
System.out.println("【Around】The Method 【" + methodName + "】 ends ");
return result;
}
}
###5.创建了另一个切面类VlidationAspect
package top.cheungchingyin.spring.aop.xml;
import java.util.Arrays;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/*
* 可以使用@order注解来指定切面的优先级，值越小优先级越高
*/
public class VlidationAspect {
public void validateArgs(JoinPoint joinpoint){
System.out.println("validate :"+Arrays.asList(joinpoint.getArgs()));
}
}
###6.配置xml文件applicationContext-xml.xml
顺序直接看代码的注释从上到下看下去即可
<?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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd">
<!-- 配置bean -->
<bean id="arithmeticCalculator"
class="top.cheungchingyin.spring.aop.xml.ArithmeticCalculatorImpl"></bean>
<!-- 配置切面的bean -->
<bean id="loggingAspect" class="top.cheungchingyin.spring.aop.xml.LoggingAspect"></bean>
<bean id="vlidationAspect" class="top.cheungchingyin.spring.aop.xml.VlidationAspect"></bean>
<!-- 配置AOP -->
<aop:config>
<!-- 配置切点表达式 -->
<aop:pointcut
expression="execution(* top.cheungchingyin.spring.aop.xml.ArithmeticCalculator.*(int , int ))"
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="ex"/> <aop:after-returning method="afterReturningMethod"
pointcut-ref="pointcut" returning="result"/> -->
<aop:around method="arroundMethod" pointcut-ref="pointcut"/>
</aop:aspect>
<aop:aspect ref="vlidationAspect" order="1">
<aop:before method="validateArgs" pointcut-ref="pointcut" />
</aop:aspect>
</aop:config>
</beans>
结果：
