Spring框架学习[AOP通知以及编程式AOP ] - JAVA

果方法只有一个参数 if (method.getParameterTypes().length == 1) { handlerArgs = new Object[] { ex }; } //获取方法的参数列表 else { handlerArgs = new Object[] {mi.getMethod(), mi.getArguments(), mi.getThis(), ex}; } try { //使用JDK反射机制，调用异常通知的异常处理方法 method.invoke(this.throwsAdvice, handlerArgs); } catch (InvocationTargetException targetEx) { throw targetEx.getTargetException(); } } }

public class ThrowsAdviceInterceptor implements MethodInterceptor, AfterAdvice {	private static final String AFTER_THROWING = "afterThrowing";	private static final Log logger = LogFactory.getLog(ThrowsAdviceInterceptor.class);	private final Object throwsAdvice;	//key为类，value为method的异常处理map	private final Map<Class, Method> exceptionHandlerMap = new HashMap<Class, Method>();//异常通知拦截器构造方法	public ThrowsAdviceInterceptor(Object throwsAdvice) {		Assert.notNull(throwsAdvice, "Advice must not be null");		//初始化异常通知		this.throwsAdvice = throwsAdvice;		//获取异常通知的方法		Method[] methods = throwsAdvice.getClass().getMethods();		//遍历所有配置异常通知的方法		for (Method method : methods) {			//如果方法名为"afterThrowing"，且方法参数为1或4，且方法参数的父类为			//Throwable，说明异常通知中有异常处理器			if (method.getName().equals(AFTER_THROWING) &&					(method.getParameterTypes().length == 1 || method.getParameterTypes().length == 4) &&	Throwable.class.isAssignableFrom(method.getParameterTypes()[method.getParameterTypes().length - 1])				) {				//添加异常处理器	this.exceptionHandlerMap.put(method.getParameterTypes()[method.getParameterTypes().length - 1], method);				if (logger.isDebugEnabled()) {					logger.debug("Found exception handler method: " + method);				}			}		}		//没有配置异常处理器		if (this.exc<div class="article-middle-ad" style="margin: 30px 0; padding: 20px 0; text-align: center; clear: both;">
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</div>eptionHandlerMap.isEmpty()) {			throw new IllegalArgumentException(					"At least one handler method must be found in class [" + throwsAdvice.getClass() + "]");		}	}	//获取异常处理器数目	public int getHandlerMethodCount() {		return this.exceptionHandlerMap.size();	}	//获取异常处理器	private Method getExceptionHandler(Throwable exception) {		//获取给定异常类		Class exceptionClass = exception.getClass();		if (logger.isTraceEnabled()) {			logger.trace("Trying to find handler for exception of type [" + exceptionClass.getName() + "]");		}		//从异常处理器map中获取给定异常类的处理器		Method handler = this.exceptionHandlerMap.get(exceptionClass);		//如果异常处理器为null，且异常类不是Throwable		while (handler == null && !exceptionClass.equals(Throwable.class)) {			//获取异常类的基类			exceptionClass = exceptionClass.getSuperclass();			//获取基类的异常处理器			handler = this.exceptionHandlerMap.get(exceptionClass);		}		if (handler != null && logger.isDebugEnabled()) {			logger.debug("Found handler for exception of type [" + exceptionClass.getName() + "]: " + handler);		}		return handler;	}	//异常通知的回调方法	public Object invoke(MethodInvocation mi) throws Throwable {		//把目标对象方法调用放入try/catch中		try {			return mi.proceed();		}		catch (Throwable ex) {			//在catch中触发异常通知的回调			Method handlerMethod = getExceptionHandler(ex);			if (handlerMethod != null) {				//使用异常处理器处理异常				invokeHandlerMethod(mi, ex, handlerMethod);			}			//将异常向上抛出			throw ex;		}	}	//异常处理器处理异常	private void invokeHandlerMethod(MethodInvocation mi, Throwable ex, Method method) throws Throwable {		Object[] handlerArgs;		//如果方法只有一个参数		if (method.getParameterTypes().length == 1) {			handlerArgs = new Object[] { ex };		}		//获取方法的参数列表		else {			handlerArgs = n</span>
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Spring框架学习[AOP通知以及编程式AOP ](九)