doFilter-->doFilterInternal-->filterChain.doFilter-->HttpServlet service(request, response)-->doGet(req, resp)-->DispatcherServlet service(ServletRequest req, ServletResponse res)-->FrameworkServlet.processRequest-->doDispatch(request, response)-->DispatcherServlet.doDispatch调用实际action（HandlerAdapter，RequestMappingHandlerAdapter）-->RequestMappingHandlerAdapter.handle-->handleInternal
Resolver Handler Processor Discoverer resolve parameter provided Args
1,httpServlet
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
String method = req.getMethod();
if (method.equals(METHOD_GET)) {
long lastModified = getLastModified(req);
if (lastModified == -1) {
// servlet doesn't support if-modified-since, no reason
// to go through further expensive logic
doGet(req, resp);
} else {
long ifModifiedSince = req.getDateHeader(HEADER_IFMODSINCE);
if (ifModifiedSince < (lastModified / 1000 * 1000)) {
// If the servlet mod time is later, call doGet()
// Round down to the nearest second for a proper compare
// A ifModifiedSince of -1 will always be less
maybeSetLastModified(resp, lastModified);
doGet(req, resp);
} else {
resp.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
}
}
} else if (method.equals(METHOD_HEAD)) {
long lastModified = getLastModified(req);
maybeSetLastModified(resp, lastModified);
doHead(req, resp);
} else if (method.equals(METHOD_POST)) {
doPost(req, resp);
} else if (method.equals(METHOD_PUT)) {
doPut(req, resp);
} else if (method.equals(METHOD_DELETE)) {
doDelete(req, resp);
} else if (method.equals(METHOD_OPTIONS)) {
doOptions(req,resp);
} else if (method.equals(METHOD_TRACE)) {
doTrace(req,resp);
} else {
//
// Note that this means NO servlet supports whatever
// method was requested, anywhere on this server.
//
String errMsg = lStrings.getString("http.method_not_implemented");
Object[] errArgs = new Object[1];
errArgs[0] = method;
errMsg = MessageFormat.format(errMsg, errArgs);
resp.sendError(HttpServletResponse.SC_NOT_IMPLEMENTED, errMsg);
}
}
2,
httpServlet
private static final String METHOD_DELETE = "DELETE";
private static final String METHOD_HEAD = "HEAD";
private static final String METHOD_GET = "GET";
private static final String METHOD_OPTIONS = "OPTIONS";
private static final String METHOD_POST = "POST";
private static final String METHOD_PUT = "PUT";
private static final String METHOD_TRACE = "TRACE";
3,DispatcherServlet获取执行的action
public class DispatcherServlet extends FrameworkServlet
protected HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception {
for (HandlerMapping hm : this.handlerMappings) {
if (logger.isTraceEnabled()) {
logger.trace(
"Testing handler map [" + hm + "] in DispatcherServlet with name '" + getServletName() + "'");
}
HandlerExecutionChain handler = hm.getHandler(request);
if (handler != null) {
return handler;
}
}
return null;
}
先获取HandlerExecutionChain
接着获取HandlerInterceptor[] interceptors = mappedHandler.getInterceptors(); for (int i = 0; i < interceptors.length; i++)
紧接着// Actually invoke the handler mv = ha.handle(processedRequest, response, mappedHandler.getHandler());
获取请求参数HandlerMethodParameter通过PathVariableMethodArgumentResolver eg：NamedValueInfo含有path的contentId
然后：在方法invokeHandlerMethod中创建ModelAndViewContainer并通过request来updateModel
在InvocableHandlerMethod调用实际
处理后在HandlerMethodReturnValueHandlerComposite处理响应，得到响应类型处理类RequestResponseBodyMethodProcessor
然后处理/ Apply postHandle methods of registered interceptors. --》for (int i = interceptors.length - 1; i >= 0; i--)
渲染数据render(mv, processedRequest, response); view.render(mv.getModelInternal(), request, response);rd.forward出去
如果不是反回json而是view eg：view/workdetail 通过ViewNameMethodReturnValueHandler设置到界面 model.put(bindingResultKey, dataBinder.getBindingResult()); model---> ModelMap ModelAndView(ModelAndView: reference to view with name 'view/workdetail'; model is {playMovieDTO=com.zqgame.zqyy.dto.PlayMovieDTO@1f60390, careerMap={}, styles=科幻, styleId=1, currentDate=Fri Nov 14 10:09:14 CST 2014, org.springframework.validation.BindingResult.playMovieDTO=org.springframework.validation.BeanPropertyBindingResult: 0 errors})