举例讲解Java的Spring框架中AOP程序设计方式的使用

package com.spring.aop; 
/** 
 * 切面 
 */ 
public class TestAspect { 
 
  public void doAfter(JoinPoint jp) { 
    System.out.println("log Ending method: " 
        + jp.getTarget().getClass().getName() + "." 
        + jp.getSignature().getName()); 
  } 
 
  public Object doAround(ProceedingJoinPoint pjp) throws Throwable { 
    long time = System.currentTimeMillis(); 
    Object retVal = pjp.proceed(); 
    time = System.currentTimeMillis() - time; 
    System.out.println("process time: " + time + " ms"); 
    return retVal; 
  } 
 
  public void doBefore(JoinPoint jp) { 
    System.out.println("log Begining method: " 
        + jp.getTarget().getClass().getName() + "." 
        + jp.getSignature().getName()); 
  } 
 
  public void doThrowing(JoinPoint jp, Throwable ex) { 
    System.out.println("method " + jp.getTarget().getClass().getName() 
        + "." + jp.getSignature().getName() + " throw exception"); 
    System.out.println(ex.getMessage()); 
  } 
 
  private void sendEx(String ex) { 
    //TODO 发送短信或邮件提醒 
  } 
}  

package com.spring.service; 
/** 
 * 接口A 
 */ 
public interface AService { 
   
  public void fooA(String _msg); 
 
  public void barA(); 
} 

package com.spring.service; 
/** 
 *接口A的实现类 
 */ 
public class AServiceImpl implements AService { 
 
  public void barA() { 
    System.out.println("AServiceImpl.barA()"); 
  } 
 
  public void fooA(String _msg) { 
    System.out.println("AServiceImpl.fooA(msg:"+_msg+")"); 
  } 
} 

package com.spring.service; 
 
/** 
 *  Service类B 
 */ 
public class BServiceImpl { 
 
  public void barB(String _msg, int _type) { 
    System.out.println("BServiceImpl.barB(msg:"+_msg+" type:"+_type+")"); 
    if(_type == 1) 
      throw new IllegalArgumentException("测试异常"); 
  } 
 
  public void fooB() { 
    System.out.println("BServiceImpl.fooB()"); 
  } 
 
} 

<?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-2.0.xsd 
      http://www.springframework.org/schema/aop 
      http://www.springframework.org/schema/aop/spring-aop-2.5.xsd" 
  default-autowire="autodetect"> 
  <aop:config> 
    <aop:aspect id="TestAspect" ref="aspectBean"> 
      <!--配置com.spring.service包下所有类或接口的所有方法--> 
      <aop:pointcut id="businessService" 
        expression="execution(* com.spring.service.*.*(..))" /> 
      <aop:before pointcut-ref="businessService" method="doBefore"/> 
      <aop:after pointcut-ref="businessService" method="doAfter"/> 
      <aop:around pointcut-ref="businessService" method="doAround"/> 
      <aop:after-throwing pointcut-ref="businessService" method="doThrowing" throwing="ex"/> 
    </aop:aspect> 
  </aop:config> 
   
  <bean id="aspectBean" class="com.spring.aop.TestAspect" /> 
  <bean id="aService" class="com.spring.service.AServiceImpl"></bean> 
  <bean id="bService" class="com.spring.service.BServiceImpl"></bean> 
 
</beans> 

public class AOPTest extends AbstractDependencyInjectionSpringContextTests { 
   
  private AService aService; 
   
  private BServiceImpl bService; 
   
  protected String[] getConfigLocations() { 
    String[] configs = new String[] { "/applicationContext.xml"}; 
    return configs; 
  } 
   
   
  /** 
   * 测试正常调用 
   */ 
  public void testCall() 
  { 
    System.out.println("SpringTest JUnit test"); 
    aService.fooA("JUnit test fooA"); 
    aService.barA(); 
    bService.fooB(); 
    bService.barB("JUnit test barB",0); 
  } 
   
  /** 
   * 测试After-Throwing 
   */ 
  public void testThrow() 
  { 
    try { 
      bService.barB("JUnit call barB",1); 
    } catch (IllegalArgumentException e) { 
       
    } 
  } 
   
  public void setAService(AService service) { 
    aService = service; 
  } 
   
  public void setBService(BServiceImpl service) { 
    bService = service; 
  } 
} 

log Begining method: com.spring.service.AServiceImpl.fooA 
AServiceImpl.fooA(msg:JUnit test fooA) 
log Ending method: com.spring.service.AServiceImpl.fooA 
process time: 0 ms 
log Begining method: com.spring.service.AServiceImpl.barA 
AServiceImpl.barA() 
log Ending method: com.spring.service.AServiceImpl.barA 
process time: 0 ms 
log Begining method: com.spring.service.BServiceImpl.fooB 
BServiceImpl.fooB() 
log Ending method: com.spring.service.BServiceImpl.fooB 
process time: 0 ms 
log Begining method: com.spring.service.BServiceImpl.barB 
BServiceImpl.barB(msg:JUnit test barB type:0) 
log Ending method: com.spring.service.BServiceImpl.barB 
process time: 0 ms 
 
log Begining method: com.spring.service.BServiceImpl.barB 
BServiceImpl.barB(msg:JUnit call barB type:1) 
log Ending method: com.spring.service.BServiceImpl.barB 
method com.spring.service.BServiceImpl.barB throw exception 
测试异常