springMVC请求流程

springMVC简单来说就是一个Servlet
org.springframework.web.servlet.DispatcherServlet
一切代码都是围绕protected void doDispatch(HttpServletRequest request, HttpServletResponse response)展开

代码机构

• org.springframework.web.servlet.HandlerMapping

  • org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping controller
    • org.springframework.web.method.HandlerMethod controller-method
  • org.springframework.web.servlet.handler.SimpleUrlHandlerMapping
    • org.springframework.web.HttpRequestHandler
      • org.springframework.web.servlet.resource.ResourceHttpRequestHandler

• org.springframework.web.servlet.HandlerAdapter

  • org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter
  • org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter

首先会有很多个org.springframework.web.servlet.HandlerMapping

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public interface HandlerMapping {
    HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception;
}

Controller会抽象成一个org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping

Method会抽象成org.springframework.web.method.HandlerMethod储存在
org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.MappingRegistry

静态资源

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<mvc:resources mapping="/resources/**" location="/public, classpath:/static/" cache-period="31556926" />

这种静态资源会抽象成org.springframework.web.servlet.handler.SimpleUrlHandlerMapping
里面静态资源路劲抽象成
org.springframework.web.HttpRequestHandler

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public interface HttpRequestHandler {
    void handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException;
}

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public abstract class AbstractUrlHandlerMapping extends AbstractHandlerMapping implements MatchableHandlerMapping {

    private Object rootHandler;

    private boolean useTrailingSlashMatch = false;

    private boolean lazyInitHandlers = false;

    //存放着
    private final Map<String, Object> handlerMap = new LinkedHashMap<String, Object>();
    }

路径匹配

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new AntPathMatcher(String pattern, String path).match();
new UrlPathHelper().getLookupPathForRequest(HttpServletRequest request);

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