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  • Java:简单的通过XML的AOP配置

    发布:昆明Java培训      来源:达内新闻      时间:2016-10-21

  • 昆明Java培训机构的老师今天给大家讲,简单的通过XML的AOP配置。

    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.

    了解详情请登陆昆明达内Java培训官网(km.Java.tedu.cn)!

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