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。
[Java]代码
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();
}
}
[Java]代码
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);
}
}