一 概述
@Before：前置通知
@After ：后置通知，方法执行完之后
@AfterReturning：返回通知，完成执行之后
@AfterThrowing：异常通知，抛出异常之后
@Around：环绕通知
二 Advice应用实例
通过环绕通知获取方法执行时间
@Component
@Aspect
public class RepositoryAspect {
@Pointcut("execution(* com.repository..*(..))")
private void crud() {
}
//环绕通知
@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+"执行时间为"+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 {
//对于controller包下所有类和方法进行获取，除被注解NoHealth标注的类除外。
@Pointcut("execution(* com.controller..*(..))&&!@annotation(NoHealth)")
private void controllerPointCut() {
}
//在方法执行之前对参数进行处理
@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;//跳出当前循环，且不执行此语句后面的语句！
}
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) {
}
}
//对方法执行之后的返回值进行某种操作
@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) {
}
}
//对方法抛出的异常进行操作
@AfterThrowing(value = "controllerPointCut()", throwing = "e")
public void exceptionLog(Exception e) {
}
}根据这些实例就可以参照写一些简单的SpringAOP实例了！