spring mvc 中 requestmappinghandleradapter 分析

在 handleInternal 方法中最主要的是调用 invokeHandlerMethod 方法。

此方法是整个类的核心方法，大部分处理流程在这个方法中完成。

WebDataBinderFactory binderFactory = getDataBinderFactory(handlerMethod);
ModelFactory modelFactory = getModelFactory(handlerMethod, binderFactory);
ServletInvocableHandlerMethod invocableMethod = createInvocableHandlerMethod(handlerMethod);
if (this.argumentResolvers != null) {
    invocableMethod.setHandlerMethodArgumentResolvers(this.argumentResolvers);
}
if (this.returnValueHandlers != null) {
    invocableMethod.setHandlerMethodReturnValueHandlers(this.returnValueHandlers);
}
invocableMethod.setDataBinderFactory(binderFactory);
invocableMethod.setParameterNameDiscoverer(this.parameterNameDiscoverer);
ModelAndViewContainer mavContainer = new ModelAndViewContainer();
......
invocableMethod.invokeAndHandle(webRequest, mavContainer);

有几个重要的对象 WebDataBinderFactory , ModelFactory , ModelAndViewContainer ,ServletInvocableHandlerMethod 。

ServletInvocableHandlerMethod.invokeAndHandle -> InvocableHandlerMethod.invokeForRequest ->
Object[] args = InvocableHandlerMethod.getMethodArgumentValues -> args[i] = HandlerMethodArgumentResolverComposite.resolveArgument(parameter, mavContainer, request, this.dataBinderFactory);
->ModelAttributeMethodProcessor.resolveArgument()
WebDataBinder binder = binderFactory.createBinder(webRequest, attribute, name);
bindRequestParameters(binder, webRequest);
validateIfApplicable(binder, parameter);-> validator.validate();
return args;

return doInvoke(args);