SpringAop中的Advice通知實例
更新時間:2023年09月25日 11:06:53 作者:至學者
這篇文章主要介紹了SpringAop中的Advice通知詳解,Spring的AOP功能中一個關鍵概念是通知Advice與切點Pointcut表達式相關聯(lián)在特定節(jié)點織入一些邏輯,Spring提供了五種類型的通知,需要的朋友可以參考下
一 概述
- @Before:前置通知
- @After :后置通知,方法執(zhí)行完之后
- @AfterReturning:返回通知,完成執(zhí)行之后
- @AfterThrowing:異常通知,拋出異常之后
- @Around:環(huán)繞通知
二 Advice應用實例
通過環(huán)繞通知獲取方法執(zhí)行時間
@Component @Aspect public class RepositoryAspect { @Pointcut("execution(* com.repository..*(..))") private void crud() { } //環(huán)繞通知 @Around("crud()") public Object logPerformance(ProceedingJoinPoint joinPoint) throws Throwable { long startTimes = System.currentTimeMillis(); Object result = null; String name = "-"; try { name = joinPoint.getSignature().toShortString(); result = joinPoint.proceed(); return result; } catch (Throwable t) { throw t; } finally { long duration = System.currentTimeMillis() - startTimes; StringBuilder stringBuilder = new StringBuilder(); stringBuilder.append(name); System.out.println(stringBuilder+"執(zhí)行時間為"+duration) } } }
public class AbstractAspect { protected ThreadLocal<Map<String, Object>> threadLocal = new ThreadLocal<>(); protected ThreadLocal<Map<String, Object>> getThreadLocal(){ if (threadLocal.get() == null){ threadLocal.set(new HashMap<>()); } return threadLocal; } }
@Component @Aspect public class ControllerAspect extends AbstractAspect { //對于controller包下所有類和方法進行獲取,除被注解NoHealth標注的類除外。 @Pointcut("execution(* com.controller..*(..))&&!@annotation(NoHealth)") private void controllerPointCut() { } //在方法執(zhí)行之前對參數(shù)進行處理 @Before(value = "controllerPointCut()") public void doBefore(JoinPoint joinPoint) { try { getThreadLocal().get().put(joinPoint.getSignature().toString(), System.currentTimeMillis()); Object[] args = joinPoint.getArgs(); MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); String[] parameterNamesArray = methodSignature.getParameterNames(); int i = 0; List<String> argsList = new ArrayList<>(); if (!ObjectUtils.isEmpty(args)) { for (Object object : args) { if (ObjectUtils.isEmpty(object) || (object instanceof BeanPropertyBindingResult) || (object instanceof HttpServletResponse) || (object instanceof Boolean) || (object instanceof String) || (object instanceof Integer)) { if ((object instanceof Boolean) || (object instanceof String) || (object instanceof Integer)) { StringBuilder stringBuilder = new StringBuilder(); stringBuilder.append("{\""); stringBuilder.append(parameterNamesArray[i]); stringBuilder.append("\":\""); stringBuilder.append(object); stringBuilder.append("\"}"); argsList.add(JSONObject.fromObject(String.valueOf(stringBuilder)).toString()); } i++; continue;//跳出當前循環(huán),且不執(zhí)行此語句后面的語句! } if (!(object instanceof HttpServletRequest)) { argsList.add(JSONObject.fromObject(object).toString()); } else { HttpServletRequest request = (HttpServletRequest) object; Enumeration<String> parameterNames = request.getParameterNames(); Map<String, String> argsMap = new HashMap<>(); while (parameterNames.hasMoreElements()) { String elementName = parameterNames.nextElement(); argsMap.put(elementName, request.getAttribute(elementName).toString()); } if (!ObjectUtils.isEmpty(argsMap)) { argsList.add(JSONObject.fromObject(argsMap).toString()); } } i++; } } StringBuilder stringBuilder = new StringBuilder(); stringBuilder.append(JSONArray.fromObject(argsList)); } catch (Exception e) { } } //對方法執(zhí)行之后的返回值進行某種操作 @AfterReturning(value = "controllerPointCut()", returning = "response") public void responseLog(JoinPoint joinPoint, Object response) { try { if (response == null) { response = new Object(); } long duration = System.currentTimeMillis() - (Long) threadLocal.get().get(joinPoint.getSignature().toString()); StringBuilder stringB uilder = new StringBuilder(); stringBuilder.append(JSONObject.fromObject(response)); } catch (Exception e) { } } //對方法拋出的異常進行操作 @AfterThrowing(value = "controllerPointCut()", throwing = "e") public void exceptionLog(Exception e) { } }
根據(jù)這些實例就可以參照寫一些簡單的SpringAOP實例了!
到此這篇關于SpringAop中的Advice通知詳解的文章就介紹到這了,更多相關Advice通知內容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家!
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