Spring3.2请求处理大致过程(五)
herwise be configured by default.
*/
//如果需要异步处理，需要注入例如DeferredResultMethodReturnValueHandler等
public void setReturnValueHandlers(List returnValueHandlers) {
if (returnValueHandlers == null) {
this.returnValueHandlers = null;
}
else {
this.returnValueHandlers = new HandlerMethodReturnValueHandlerComposite();
this.returnValueHandlers.addHandlers(returnValueHandlers);
}
}
/**
* Default constructor.
*/
public RequestMappingHandlerAdapter() {
StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter();
stringHttpMessageConverter.setWriteAcceptCharset(false); // See SPR-7316
this.messageConverters = new ArrayList>();//converter均集成HttpMessageConverter来拦截http请求
this.messageConverters.add(new ByteArrayHttpMessageConverter());
this.messageConverters.add(stringHttpMessageConverter);
this.messageConverters.add(new SourceHttpMessageConverter());
this.messageConverters.add(new AllEncompassingFormHttpMessageConverter());
}
/**
* Provide the converters to use in argument resolvers and return value
* handlers that support reading and/or writing to the body of the
* request and response.
*/
public void setMessageConverters(List> messageConverters) {
this.messageConverters = messageConverters;
}
/**
* Set the default {@link AsyncTaskExecutor} to use when a controller method
* return a {@link Callable}. Controller methods can override this default on
* a per-request basis by returning an {@link WebAsyncTask}.
*
By default a {@link SimpleAsyncTaskExecutor} instance is used.
* It's recommended to change that default in production as the simple executor
* does not re-use threads.
*/
//设置异步执行类,给AsyncManager调用
public void setTaskExecutor(AsyncTaskExecutor taskExecutor) {
this.taskExecutor = taskExecutor;
}
ServletInvocableHandlerMethod.java
调用invokeAndHandle
[java]
/**
* Invokes the method and handles the return value through a registered
* {@link HandlerMethodReturnValueHandler}.
*
* @param webRequest the current request
* @param mavContainer the ModelAndViewContainer for this request
* @param providedArgs "given" arguments matched by type, not resolved
*/
public final void invokeAndHandle(ServletWebRequest webRequest,
ModelAndViewContainer mavContainer, Object... providedArgs) throws Exception {
Object returnValue = invokeForRequest(webRequest, mavContainer, providedArgs);
setResponseStatus(webRequest);
if (returnValue == null) {
if (isRequestNotModified(webRequest) || hasResponseStatus() || mavContainer.isRequestHandled()) {
mavContainer.setRequestHandled(true);
return;
}
}
else if (StringUtils.hasText(this.responseReason)) {
mavContainer.s