SpringMVC源码解读 - RequestMapping注解实现解读 - RequestMappingInfo

使用@RequestMapping注解时,配置的信息最后都设置到了RequestMappingInfo中.

RequestMappingInfo封装了PatternsRequestCondition,RequestMethodsRequestCondition,ParamsRequestCondition等,所以自己不干活,所有的活都是委托给具体的condition处理.

先看下封装的RequestCondition吧,之前的文章将的比较细了,不清楚各个类具体是做什么的,可以移步这里<SpringMVC源码解读 - RequestMapping注解实现解读 - RequestCondition体系>

 package org.springframework.web.servlet.mvc.method;
 public final class RequestMappingInfo implements RequestCondition<RequestMappingInfo> {

     private final PatternsRequestCondition patternsCondition;

     private final RequestMethodsRequestCondition methodsCondition;

     private final ParamsRequestCondition paramsCondition;

     private final HeadersRequestCondition headersCondition;

     private final ConsumesRequestCondition consumesCondition;

     private final ProducesRequestCondition producesCondition;

     private final RequestConditionHolder customConditionHolder;
 }

初始化没什么好看的,直接看接口的实现吧.

貌似combine也没啥料,就是分别委托

     /**
      * Combines "this" request mapping info (i.e. the current instance) with another request mapping info instance.
      * <p>Example: combine type- and method-level request mappings.
      * @return a new request mapping info instance; never {@code null}
      */
     public RequestMappingInfo combine(RequestMappingInfo other) {
         PatternsRequestCondition patterns = this.patternsCondition.combine(other.patternsCondition);
         RequestMethodsRequestCondition methods = this.methodsCondition.combine(other.methodsCondition);
         ParamsRequestCondition params = this.paramsCondition.combine(other.paramsCondition);
         HeadersRequestCondition headers = this.headersCondition.combine(other.headersCondition);
         ConsumesRequestCondition consumes = this.consumesCondition.combine(other.consumesCondition);
         ProducesRequestCondition produces = this.producesCondition.combine(other.producesCondition);
         RequestConditionHolder custom = this.customConditionHolder.combine(other.customConditionHolder);

         return new RequestMappingInfo(patterns, methods, params, headers, consumes, produces, custom.getCondition());
     }

getMatchingCondition只是体现出可能基于性能消耗的考虑,把PatternsRequestCondition和RequestConditionHolder的比较放到后面单独处理了.

     /**
      * Checks if all conditions in this request mapping info match the provided request and returns
      * a potentially new request mapping info with conditions tailored to the current request.
      * <p>For example the returned instance may contain the subset of URL patterns that match to
      * the current request, sorted with best matching patterns on top.
      * @return a new instance in case all conditions match; or {@code null} otherwise
      */
     public RequestMappingInfo getMatchingCondition(HttpServletRequest request) {
         RequestMethodsRequestCondition methods = methodsCondition.getMatchingCondition(request);
         ParamsRequestCondition params = paramsCondition.getMatchingCondition(request);
         HeadersRequestCondition headers = headersCondition.getMatchingCondition(request);
         ConsumesRequestCondition consumes = consumesCondition.getMatchingCondition(request);
         ProducesRequestCondition produces = producesCondition.getMatchingCondition(request);

         if (methods == null || params == null || headers == null || consumes == null || produces == null) {
             return null;
         }

         PatternsRequestCondition patterns = patternsCondition.getMatchingCondition(request);
         if (patterns == null) {
             return null;
         }

         RequestConditionHolder custom = customConditionHolder.getMatchingCondition(request);
         if (custom == null) {
             return null;
         }

         return new RequestMappingInfo(patterns, methods, params, headers, consumes, produces, custom.getCondition());
     }

compareTo就是排了个不同RequestCondition的优先级

     /**
      * Compares "this" info (i.e. the current instance) with another info in the context of a request.
      * <p>Note: it is assumed both instances have been obtained via
      * {@link #getMatchingCondition(HttpServletRequest)} to ensure they have conditions with
      * content relevant to current request.
      */
     public int compareTo(RequestMappingInfo other, HttpServletRequest request) {
         int result = patternsCondition.compareTo(other.getPatternsCondition(), request);
         if (result != 0) {
             return result;
         }
         result = paramsCondition.compareTo(other.getParamsCondition(), request);
         if (result != 0) {
             return result;
         }
         result = headersCondition.compareTo(other.getHeadersCondition(), request);
         if (result != 0) {
             return result;
         }
         result = consumesCondition.compareTo(other.getConsumesCondition(), request);
         if (result != 0) {
             return result;
         }
         result = producesCondition.compareTo(other.getProducesCondition(), request);
         if (result != 0) {
             return result;
         }
         result = methodsCondition.compareTo(other.getMethodsCondition(), request);
         if (result != 0) {
             return result;
         }
         result = customConditionHolder.compareTo(other.customConditionHolder, request);
         if (result != 0) {
             return result;
         }
         return 0;
     }

覆写的equals,hashCode,toString不看也罢