一、看一下简单的通过XML的AOP配置
1.首先创建一个简单的Student类
public class Student {
private Integer age;
private String name;
public void setAge(Integer age) {
this.age = age;
}
public Integer getAge() {
System.out.println("Age : " + age);
return age;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
System.out.println("Name : " + name);
return name;
}
public void printThrowException() {
System.out.println("Exception raised");
throw new IllegalArgumentException();
}
}
2.创建一个简单的aspect切面class
public class Logging {/**
* This is the method which I would like to execute
* before a selected method execution.
*/public void beforeAdvice() {
System.out.println("Going to setup student profile.");
}
/**
* This is the method which I would like to execute
* after a selected method execution.
*/public void afterAdvice() {
System.out.println("Student profile has been setup.");
}
/**
* This is the method which I would like to execute
* when any method returns.
*/
public void afterReturningAdvice(Object retVal) {
System.out.println("Returning:" + retVal.toString());
}
/**
* This is the method which I would like to execute
* if there is an exception raised.
*/
public void AfterThrowingAdvice(IllegalArgumentException ex) {
System.out.println("There has been an exception: " + ex.toString());
}
}
3.SpringAOP.xml配置
<bean id="student" class="com.seeyon.SpringBean.aop.Student" p:name="yangyu" p:age="27"></bean>
<bean id="logging" class="com.seeyon.SpringBean.aop.Logging"></bean> <!--XML方式配置Spring AOP-->
<aop:config>
<aop:aspect id="log" ref="logging"> 【切面class】
<aop:pointcut id="studentMethod" expression="execution(* com.seeyon.SpringBean.aop.Student.get*(..))"/> 【切点】
<aop:before pointcut-ref="studentMethod" method="beforeAdvice"/> 【方法执行之前触发切面class的beforeAdvice方法】
<aop:after pointcut-ref="studentMethod" method="afterAdvice"/> 【方法执行之后触发切面class的afterAdvice方法】
</aop:aspect>
</aop:config>
分析一下这个execution(* com.seeyon.SpringBean.aop.Student.get*(..))切点表达式：
(1)第一个*代表方法的返回值是任意的
(2)get*代表以get开头的所有方法
(3)(..)代表方法的参数是任意个数
4.main方法
public class test {
public static void main(String[] args) {
ApplicationContext context =
new ClassPathXmlApplicationContext("SpringAop.xml");
Student student = (Student) context.getBean("student");
student.getName();
// student.getAge();
// student.printThrowException();
}
}
5.输出结果
Going to setup student profile.
Name : yangyu
Student profile has been setup.
二、Spring AOP注解的使用。
1.首先创建一个简单的Student类（同一.1中，请看上面