spring AOP @Around @Before @After 区别

spring AOP @Around @Before @After 区别

java程序员 发布于 2012年03月09日 14时, 6评/24677阅

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此段小代码演示了spring aop中@Around @Before @After三个注解的区别
@Before是在所拦截方法执行之前执行一段逻辑。
@After 是在所拦截方法执行之后执行一段逻辑。
@Around是可以同时在所拦截方法的前后执行一段逻辑。

1. [代码][Java]代码     跳至 [1] [2] [3] [全屏预览]

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package com.itsoft.action;   import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.stereotype.Controller;   /**   *    * @author zxf   * 演示aop测试类   */ @Controller public class UserAction {             public void queryUsers(){                     System.out.println( "查询所有用户【all users list】" );      }             public static void main(String[] args) {                     ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext( "application-aop.xml" );                     UserAction userAction = (UserAction)ctx.getBean( "userAction" );          userAction.queryUsers();                     ctx.destroy();      } }     2. [代码][Java]代码     跳至 [1] [2] [3] [全屏预览] ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 package com.itsoft;   import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.After; 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.stereotype.Component;   /**   *    * @author Administrator   * 通过aop拦截后执行具体操作   */ @Aspect @Component public class LogIntercept {             @Pointcut ( "execution(public * com.itsoft.action..*.*(..))" )      public void recordLog(){}                    @Before ( "recordLog()" )      public void before() {          this .printLog( "已经记录下操作日志@Before 方法执行前" );      }             @Around ( "recordLog()" )      public void around(ProceedingJoinPoint pjp) throws Throwable{          this .printLog( "已经记录下操作日志@Around 方法执行前" );          pjp.proceed();          this .printLog( "已经记录下操作日志@Around 方法执行后" );      }                    @After ( "recordLog()" )      public void after() {          this .printLog( "已经记录下操作日志@After 方法执行后" );      }                    private void printLog(String str){          System.out.println(str);      } } 3. [代码]演示@Around @Before @After 区别     跳至[1][2][3][全屏预览] ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 <?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"        xmlns:context= "http://www.springframework.org/schema/context"        xsi:schemaLocation="         http: //www.springframework.org/schema/context       http: //www.springframework.org/schema/context/spring-context-3.0.xsd       http: //www.springframework.org/schema/beans        http: //www.springframework.org/schema/beans/spring-beans-3.0.xsd       http: //www.springframework.org/schema/aop        http: //www.springframework.org/schema/aop/spring-aop-3.0.xsd">    <context:annotation-config />      <context:component-scan base- package = "com.itsoft" />      <aop:aspectj-autoproxy /> </beans> 举报 开源中国-程序员在线工具：Git代码托管API文档大全(120+) JS在线编辑演示 二维码 更多»