Spring之aop切面编程的xml实现.md

Spring之aop切面编程的xml实现

• 1、加入jar包

  jar包同注解的
  

• 2、详细代码实现

  业务层接口：

  package com.edu.service;
  
  public interface StudentService {
      Integer add();
      Integer delete(Integer integer);
  }  
  

  业务层实现：

  package com.edu.service.impl;
  
  import com.edu.service.StudentService;
  
  public class StudentServiceImpl implements StudentService {
      @Override
      public Integer add() {
          System.out.println("业务层执行add方法");
          if(1 == 2){
              throw new RuntimeException();
          }
          return 1;
      }
  
      @Override
      public Integer delete(Integer integer) {
          System.out.println("业务层执行delete方法");
          return 1;
      }
  }
  

  切面

  package com.edu.aop;
  
  import org.aspectj.lang.JoinPoint;
  import org.aspectj.lang.ProceedingJoinPoint;
  
  import java.util.Arrays;
  
  //@Component
  public class StudentAop2 {
      public void before(JoinPoint joinPoint) {
          System.out.println("学生增加之前操作--方法名:"
                  + joinPoint.getSignature().getName() +
                  "方法参数:"+Arrays.toString(joinPoint.getArgs()));
      }
      public void afterReturning(JoinPoint joinPoint,Object r) {
          System.out.println("正常返回后执行--方法名:" +
                  joinPoint.getSignature().getName()+"方法参数:" +
                  Arrays.toString(joinPoint.getArgs()) +
                  "==返回值"+r);
      }
      public void afterThrowing(JoinPoint joinPoint,Exception e) {
          System.out.println("出现异常时执行--方法名:" +
                  joinPoint.getSignature().getName()+"方法参数:" +
                  Arrays.toString(joinPoint.getArgs()) +
                  "异常"+e);
      }
      public void after(JoinPoint joinPoint) {
          System.out.println("后置执行--方法名:" +
                  joinPoint.getSignature().getName()+"方法参数:" +
                  Arrays.toString(joinPoint.getArgs()));
      }
      public Object around(ProceedingJoinPoint pjp) throws Throwable {
          String methodName = pjp.getSignature().getName();
          System.out.println("这是"+methodName+"方法的前置");
          Object result=null;
          try {
              result = pjp.proceed();
              System.out.println("这是"+methodName+"方法的返回通知");
          } catch (Throwable e) {
              System.out.println("这是"+methodName+"方法的异常通知");
              throw e;
          }finally {
              System.out.println("这是"+methodName+"方法的后置通知");
          }
          return result;
      }
  }
  

• 3、配置文件开启包扫描spring.xml

  <context:component-scan base-package="com.edu"/>
  
  <bean id="studentService" class="com.edu.service.impl.StudentServiceImpl"/>
  <bean id="studentAop2" class="com.edu.aop.StudentAop2"/>
  <aop:config>
      <aop:pointcut id="pointcut" expression="execution(* com..service.*.*(..))"/>
      <aop:aspect ref="studentAop2">
          <aop:before method="before" pointcut="execution(* com..service.*.*(..))"/>
          <aop:after method="after"  pointcut-ref="pointcut"/>
          <aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="r"/>
          <aop:after-throwing method="afterThrowing" pointcut-ref="pointcut" throwing="e"/>
          <!--<aop:around method="around" pointcut-ref="pointcut"/>-->
      </aop:aspect>
  </aop:config>
  

• 4、测试

  package com.edu;
  
  import com.edu.service.StudentService;
  import org.junit.Test;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.support.ClassPathXmlApplicationContext;
  
  public class StudentTest {
      @Test
      public void testAdd(){
          ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");
          StudentService service = applicationContext.getBean(StudentService.class);
          System.out.println(service.add());
      }
  
      @Test
      public void testDelete(){
          ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");
          StudentService service = applicationContext.getBean(StudentService.class);
          System.out.println(service.delete(1));
      }
  }