springmvc 异常处理

最新推荐文章于 2024-06-20 01:17:21 发布

原创最新推荐文章于 2024-06-20 01:17:21 发布 · 117 阅读

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本文详细介绍了Spring MVC框架中异常处理的核心组件与流程。重点解析了DispatcherServlet如何通过HandlerExceptionResolverComposite来处理异常，包括使用ExceptionHandlerExceptionResolver处理带有@ExceptionHandler的方法，ResponseStatusExceptionResolver处理带有@ResponseStatus注解的异常，以及DefaultHandlerExceptionResolver处理已知的Spring异常。

异常在哪里处理的呢

DispatcherServlet : processHandlerException

中

默认的处理器

HandlerExceptionResolverComposite
其中有三个resolver
在WebMvcConfigurationSupport中添加

/**
	 * A method available to subclasses for adding default {@link HandlerExceptionResolver}s.
	 * <p>Adds the following exception resolvers:
	 * <ul>
	 * <li>{@link ExceptionHandlerExceptionResolver}
	 * for handling exceptions through @{@link ExceptionHandler} methods.
	 * <li>{@link ResponseStatusExceptionResolver}
	 * for exceptions annotated with @{@link ResponseStatus}.
	 * <li>{@link DefaultHandlerExceptionResolver}
	 * for resolving known Spring exception types
	 * </ul>
	 */
	protected final void addDefaultHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
		ExceptionHandlerExceptionResolver exceptionHandlerExceptionResolver = new ExceptionHandlerExceptionResolver();
		exceptionHandlerExceptionResolver.setContentNegotiationManager(mvcContentNegotiationManager());
		exceptionHandlerExceptionResolver.setMessageConverters(getMessageConverters());
		if (jackson2Present) {
			List<ResponseBodyAdvice<?>> interceptors = new ArrayList<ResponseBodyAdvice<?>>();
			interceptors.add(new JsonViewResponseBodyAdvice());
			exceptionHandlerExceptionResolver.setResponseBodyAdvice(interceptors);
		}
		exceptionHandlerExceptionResolver.setApplicationContext(this.applicationContext);
		exceptionHandlerExceptionResolver.afterPropertiesSet();
		exceptionResolvers.add(exceptionHandlerExceptionResolver);

		ResponseStatusExceptionResolver responseStatusExceptionResolver = new ResponseStatusExceptionResolver();
		responseStatusExceptionResolver.setMessageSource(this.applicationContext);
		exceptionResolvers.add(responseStatusExceptionResolver);

		exceptionResolvers.add(new DefaultHandlerExceptionResolver());
	}