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Spring MVC核心功能异常处理机制原理详解( 二 )

spring

异常解析器默认配置public class WebMvcAutoConfiguration {@Configuration(proxyBeanMethods = false)@EnableConfigurationProperties(WebProperties.class)public static class EnableWebMvcConfiguration extends DelegatingWebMvcConfiguration {}}public class WebMvcConfigurationSupport {@Beanpublic HandlerExceptionResolver handlerExceptionResolver(@Qualifier("mvcContentNegotiationManager") ContentNegotiationManager contentNegotiationManager) {List<HandlerExceptionResolver> exceptionResolvers = new ArrayList<>();// 处理自定义异常解析器的配置configureHandlerExceptionResolvers(exceptionResolvers);if (exceptionResolvers.isEmpty()) {// 如果没有异常解析器，那么添加默认的异常解析器addDefaultHandlerExceptionResolvers(exceptionResolvers, contentNegotiationManager);}extendHandlerExceptionResolvers(exceptionResolvers);HandlerExceptionResolverComposite composite = new HandlerExceptionResolverComposite();// 设置高优先级，Composite成为统一的入口composite.setOrder(0);composite.setExceptionResolvers(exceptionResolvers);return composite;}// 默认配置protected final void addDefaultHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers, ContentNegotiationManager mvcContentNegotiationManager) {ExceptionHandlerExceptionResolver exceptionHandlerResolver = createExceptionHandlerExceptionResolver();exceptionHandlerResolver.setContentNegotiationManager(mvcContentNegotiationManager);exceptionHandlerResolver.setMessageConverters(getMessageConverters());exceptionHandlerResolver.setCustomArgumentResolvers(getArgumentResolvers());exceptionHandlerResolver.setCustomReturnValueHandlers(getReturnValueHandlers());if (jackson2Present) {exceptionHandlerResolver.setResponseBodyAdvice(Collections.singletonList(new JsonViewResponseBodyAdvice()));}if (this.applicationContext != null) {exceptionHandlerResolver.setApplicationContext(this.applicationContext);}exceptionHandlerResolver.afterPropertiesSet();exceptionResolvers.add(exceptionHandlerResolver);ResponseStatusExceptionResolver responseStatusResolver = new ResponseStatusExceptionResolver();responseStatusResolver.setMessageSource(this.applicationContext);exceptionResolvers.add(responseStatusResolver);exceptionResolvers.add(new DefaultHandlerExceptionResolver());}}完毕！！！




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