最近項目中用到AOP方式進行Service操作方法日誌管理,特爲之記!
1、先說理論和採用的方法
採用註解的方式,其中包括以下註解:@Aspect(類註解)和@AfterReturning(方法註解),其中需要用的Maven庫如下:
"org.aspectj:aspectjrt:1.8.9","org.aspectj:aspectjweaver:1.8.9",
org.springframework spring-aop 4.0.5.RELEASE其中該兩個註解的主要用法爲:
@Aspect:Spring AOP支持的AspectJ切入點指示符
@AfterReturning:使用@AfterReturning可修飾AfterReturning增強處理,AfterReturning增強處理將在目標方法正常完成後被織入。
使用@AfterReturning註解可指定如下兩個常用屬性。
1) pointcut/value:這兩個屬性的作用是一樣的,它們都屬於指定切入點對應的切入表達式。一樣既可以是已有的切入點,也可直接定義切入點表達式。當指定了pointcut屬性值後,value屬性值將會被覆蓋。
2) returning:該屬性指定一個形參名,用於表示Advice方法中可定義與此同名的形參,該形參可用於訪問目標方法的返回值。除此之外,在Advice方法中定義該形參(代表目標方法的返回值)時指定的類型,會限制目標方法必須返回指定類型的值或沒有返回值。
2、樣例:
2.1 在spring-app-config.xml中聲明啓動aop
<!--配置aop自動創建代理-->
<aop:aspectj-autoproxy proxy-target-class="true"/>
<bean id="customerAspectLogger" class="com.XXX.dsppt.aop.CustomerAspectLogger"></bean>
<bean id="systemAspectLogger" class="com.VVVV.dsppt.aop.SystemAspectLogger"></bean>
2.2 編寫日誌切面類
package com.XXX.dsppt.aop;
import com.XXX.dsppt.entity.SystemLog;
import com.XXX.dsppt.entity.User;
import com.XXX.dsppt.entity.meta.SystemOperateType;
import com.XXX.dsppt.security.SecurityConstants;
import com.XXX.dsppt.service.ILogService;
import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.Date;
/**
* Created by nongdapeng on 17/5/4.
*/
@Aspect
public class SystemAspectLogger {
private static final Logger logger = Logger.getLogger(SystemAspectLogger.class);
@Resource
private ILogService logService;
/**
* 創建日誌
* @param point
* @throws Throwable
*/
@AfterReturning(value = "execution (* com.XXX.dsppt.service.*.add*(..))", returning = "returnObj")
public void endAddTransaction(JoinPoint point, Object returnObj) throws Throwable {
//獲取方法名
String methodName = point.getSignature().getName();
User user = getUser();
HttpServletRequest request = getRequest();
if (user != null) {
SystemLog systemLog = new SystemLog(user,new Date(), SystemOperateType.ADD);
logService.createSystemLog(systemLog);
}
}
/**
* 更新日誌
* @param point
* @throws Throwable
*/
@AfterReturning(value = "execution (* com.XXX.dsppt.service.*.update*(..))", returning = "returnObj")
public void endUpdateTransaction(JoinPoint point, Object returnObj) throws Throwable {
//獲取方法名
String methodName = point.getSignature().getName();
User user = getUser();
HttpServletRequest request = getRequest();
if (user != null) {
SystemLog systemLog = new SystemLog(user,new Date(), SystemOperateType.UPDATE);
logService.createSystemLog(systemLog);
}
}
/**
* 刪除日誌
* @param point
* @throws Throwable
*/
@AfterReturning(value = "execution (* com.XXX.dsppt.service.*.remove*(..))", returning = "returnObj")
public void endRemoveTransaction(JoinPoint point, Object returnObj) throws Throwable {
//獲取方法名
String methodName = point.getSignature().getName();
User user = getUser();
HttpServletRequest request = getRequest();
if (user != null) {
SystemLog systemLog = new SystemLog(user,new Date(), SystemOperateType.REMOVE);
logService.createSystemLog(systemLog);
}
}
/**
* 導出日誌
* @param point
* @throws Throwable
*/
@AfterReturning(value = "execution (* com.XXX.dsppt.service.*.export*(..))", returning = "returnObj")
public void endExportTransaction(JoinPoint point, Object returnObj) throws Throwable {
//獲取方法名
String methodName = point.getSignature().getName();
User user = getUser();
HttpServletRequest request = getRequest();
if (user != null) {
SystemLog systemLog = new SystemLog(user,new Date(), SystemOperateType.EXPORT);
logService.createSystemLog(systemLog);
}
}
private User getUser() {
User user = null;
try {
ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();
HttpSession session = attr.getRequest().getSession(true);
user = (User) session.getAttribute(SecurityConstants.LOGIN_SESSION);
} catch (Exception ignored) {
ignored.printStackTrace();
logger.error("獲取當前登陸用戶時發生錯誤:" + ignored.getMessage());
}
return user;
}
private HttpServletRequest getRequest() {
HttpServletRequest request = null;
try {
ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();
request = attr.getRequest();
} catch (Exception ignored) {
ignored.printStackTrace();
logger.error("獲取當前用戶ip錯誤:" + ignored.getMessage());
}
return request;
}
}
其中,一些相關概念: Aspect - 切面
Pointcut - 切入點
Joinpoint - 連接點
Pointcut Designators (PCD)
Spring AOP中, 切入點(Pointcut)註釋符在使用execution方法時以下的連接點(joinpoint)是可用的。
• execution
• within
• this
• target
• args
• @target
• @args
• @within
• @annotation
• bean
以下的切入點(pointcut)僅支持基於XML的Spring AOP配置,不支持AspectJ註釋形式。如使用將會導致IllegalArgumentException異常。他們是:
• call
• get
• set
• preinitialization
• staticinitialization
• initialization
• handler
• adviceexecution
• withincode
• cflow
• cflowbelow
• if
• @this
• @withincode