您正在查看非常旧的文档(尽管current one没有多说)。
Spring使用ThrowsAdviceInterceptor
来处理ThrowsAdvice
。你可以找到版本4.1.4.RELEASE
源代码here。
它的构造
public ThrowsAdviceInterceptor(Object throwsAdvice) {
Assert.notNull(throwsAdvice, "Advice must not be null");
this.throwsAdvice = throwsAdvice;
Method[] methods = throwsAdvice.getClass().getMethods();
for (Method method : methods) {
if (method.getName().equals(AFTER_THROWING) &&
(method.getParameterTypes().length == 1 || method.getParameterTypes().length == 4) &&
Throwable.class.isAssignableFrom(method.getParameterTypes()[method.getParameterTypes().length - 1])
) {
// Have an exception handler
this.exceptionHandlerMap.put(method.getParameterTypes()[method.getParameterTypes().length - 1], method);
if (logger.isDebugEnabled()) {
logger.debug("Found exception handler method: " + method);
}
}
}
if (this.exceptionHandlerMap.isEmpty()) {
throw new IllegalArgumentException(
"At least one handler method must be found in class [" + throwsAdvice.getClass() + "]");
}
}
扫描的适当的方法和它们注册。然后它包装目标方法调用
@Override
public Object invoke(MethodInvocation mi) throws Throwable {
try {
return mi.proceed();
}
catch (Throwable ex) {
Method handlerMethod = getExceptionHandler(ex);
if (handlerMethod != null) {
invokeHandlerMethod(mi, ex, handlerMethod);
}
throw ex;
}
}
并在引发异常时调用处理函数。
谢谢,那正是我一直在寻找的。很高兴看到AFTER_THROWING静态成员。 – djangofan 2015-04-03 02:00:08