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通知(Advice)
前置通知(Before)
后置通知(After)//最终通知
返回通知(After-Running)//程序正常运行返回执行
异常通知(After-throwing)//返回错误运行返回异常
环绕通知(Around)
切点(Pointcut)
通知定义了何时工作以及工作内容,切点则定义了在何处工作,也就是在哪个方法应用通知。Spring AOP借助AspectJ的切点表达式来确定通知被应用的位置。execution切点指示器 如:
execution(* com.deo.springaop.Test.test(..))
应用示例如下:
package com.manager.aspect;
import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
import java.util.Arrays;
/**
* 日志切面
* Created by Kevin on 2017/10/29.
*/
@Aspect
@Component
public class LogAspect {
/**
* 操作日志文件名
*/
private static final String OPERATION_LOG_NAME = "operationLog";
private static final String LOG_FORMATTER = "%s.%s - %s";
Logger log = Logger.getLogger(OPERATION_LOG_NAME);
/**
* 对查询方法记录日志的切点
*/
@Pointcut("execution(* com.manager..*.*Controller.query*(..))")
public void query(){}
/**
* 对新增方法记录日志的切点
*/
@Pointcut("execution(* com.manager..*.*Controller.add*(..))")
public void add(){}
/**
* 对修改方法记录日志的切点
*/
@Pointcut("execution(* com.manager..*.*Controller.update*(..))")
public void update(){}
/**
* 对删除方法记录日志的切点
*/
@Pointcut("execution(* com.manager..*.*Controller.delete*(..))")
public void delete(){}
@AfterReturning(value = "query()", returning = "rvt")
public void queryLog(JoinPoint joinPoint, Object rvt) {
String className = joinPoint.getTarget().getClass().getName();
String methodName = joinPoint.getSignature().getName();
String returnResult = rvt.toString();
log.info(String.format(LOG_FORMATTER, className, methodName, returnResult));
}
@Before("add()")
public void addLog(JoinPoint joinPoint) {
String className = joinPoint.getTarget().getClass().getName();
String methodName = joinPoint.getSignature().getName();
Object[] params = joinPoint.getArgs();
log.info(String.format(LOG_FORMATTER, className, methodName, Arrays.toString(params)));
}
@Before("update()")
public void updateLog(JoinPoint joinPoint) {
String className = joinPoint.getTarget().getClass().getName();
String methodName = joinPoint.getSignature().getName();
Object[] params = joinPoint.getArgs();
log.info(String.format(LOG_FORMATTER, className, methodName, Arrays.toString(params)));
}
@Before("delete()")
public void deleteLog(JoinPoint joinPoint) {
String className = joinPoint.getTarget().getClass().getName();
String methodName = joinPoint.getSignature().getName();
Object[] params = joinPoint.getArgs();
log.info(String.format(LOG_FORMATTER, className, methodName, Arrays.toString(params)));
}
}
其中要在切面中配置切点既要被增强的的方法(使用exection表达式指明切点);再对相应的切点配置各种通知。