009错误处理(代码片段)

@Configuration
@ConditionalOnWebApplication
@ConditionalOnClass( Servlet.class, DispatcherServlet.class )
// Load before the main WebMvcAutoConfiguration so that the error View is available
@AutoConfigureBefore(WebMvcAutoConfiguration.class)
@EnableConfigurationProperties(ResourceProperties.class)
public class ErrorMvcAutoConfiguration 

    @Bean
    @ConditionalOnMissingBean(value = ErrorAttributes.class, search = SearchStrategy.CURRENT)
    public DefaultErrorAttributes errorAttributes() 
        return new DefaultErrorAttributes();
    

@Bean
    @ConditionalOnMissingBean(value = ErrorController.class, search = SearchStrategy.CURRENT)
    public BasicErrorController basicErrorController(ErrorAttributes errorAttributes) 
        return new BasicErrorController(errorAttributes, this.serverProperties.getError(),
                this.errorViewResolvers);
    

@Bean
    public ErrorPageCustomizer errorPageCustomizer() 
        return new ErrorPageCustomizer(this.serverProperties);
    

　　@Bean
    public static PreserveErrorControllerTargetClassPostProcessor preserveErrorControllerTargetClassPostProcessor() 
        return new PreserveErrorControllerTargetClassPostProcessor();
    

@Configuration
    static class DefaultErrorViewResolverConfiguration 

        private final ApplicationContext applicationContext;

        private final ResourceProperties resourceProperties;

        DefaultErrorViewResolverConfiguration(ApplicationContext applicationContext,
                ResourceProperties resourceProperties) 
            this.applicationContext = applicationContext;
            this.resourceProperties = resourceProperties;
        

        @Bean
        @ConditionalOnBean(DispatcherServlet.class)
        @ConditionalOnMissingBean
        public DefaultErrorViewResolver conventionErrorViewResolver() 
            return new DefaultErrorViewResolver(this.applicationContext,
                    this.resourceProperties);
        

    

    @Value("$error.path:/error")
    private String path = "/error";

@Controller
@RequestMapping("$server.error.path:$error.path:/error")
public class BasicErrorController extends AbstractErrorController 

@RequestMapping(produces = "text/html")
    public ModelAndView errorHtml(HttpServletRequest request,
            HttpServletResponse response) 
        HttpStatus status = getStatus(request);
        Map<String, Object> model = Collections.unmodifiableMap(getErrorAttributes(
                request, isIncludeStackTrace(request, MediaType.TEXT_HTML)));
        response.setStatus(status.value());
        ModelAndView modelAndView = resolveErrorView(request, response, status, model);
        return (modelAndView == null ? new ModelAndView("error", model) : modelAndView);
    

    @RequestMapping
    @ResponseBody
    public ResponseEntity<Map<String, Object>> error(HttpServletRequest request) 
        Map<String, Object> body = getErrorAttributes(request,
                isIncludeStackTrace(request, MediaType.ALL));
        HttpStatus status = getStatus(request);
        return new ResponseEntity<Map<String, Object>>(body, status);
    

@Component
public class ExceptionHandlerConfig implements HandlerExceptionResolver 

    @Override
    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,
            Exception ex) 
        // 在这里我们能够完成异常的解析工作,这是比较重要的.
        
        // 重定向到springboot为我们做的一个错误处理器.
        ModelAndView mv = new ModelAndView("forword:/error");
        return mv;
    

@Component
public class ErrorAttributesEnhance extends DefaultErrorAttributes

    @Override
    public Map<String, Object> getErrorAttributes(RequestAttributes requestAttributes, boolean includeStackTrace) 
         
        // 获取父类之中的错误的属性
         Map<String, Object> errorAttributes = super.getErrorAttributes(requestAttributes, includeStackTrace);
         //然后我们可以对这个map进行处理,添加或者删除
         return errorAttributes;