Spring MVC : 内置缺省使用的 HandlerInterceptor_内置handlerinterceptor-优快云博客

本文链接：https://blog.youkuaiyun.com/andy_zhang2007/article/details/99426017

本文详细介绍了SpringMVC中HandlerInterceptor的应用，包括ConversionServiceExposingInterceptor和ResourceUrlProviderExposingInterceptor的作用与实现方式。前者负责将ConversionService设置为请求属性，后者则设置ResourceUrlProvider。这些拦截器在WebMvcConfigurationSupport的getInterceptors方法中被注册。

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ConversionServiceExposingInterceptor
- 仅实现preHandle : 将ConversionService设置为请求的属性org.springframework.core.convert.ConversionService;
ResourceUrlProviderExposingInterceptor
- 仅实现preHandle : 将ResourceUrlProvider设置为请求的属性org.springframework.web.servlet.resource.ResourceUrlProvider;

缺省HandlerInterceptor应用点为WebMvcConfigurationSupport#getInterceptors:

	/**
	 * Provide access to the shared handler interceptors used to configure
	 * HandlerMapping instances with.
	 * <p>This method cannot be overridden; use #addInterceptors instead.
	 */
	protected final Object[] getInterceptors() {
		if (this.interceptors == null) {
			InterceptorRegistry registry = new InterceptorRegistry();
			addInterceptors(registry);
			registry.addInterceptor(new ConversionServiceExposingInterceptor(mvcConversionService()));
			registry.addInterceptor(new ResourceUrlProviderExposingInterceptor(mvcResourceUrlProvider()));
			this.interceptors = registry.getInterceptors();
		}
		return this.interceptors.toArray();
	}