Spring Boot启动过程中的自动配置：WebMvcAutoConfiguration、MessageSourceAutoConfiguration与ErrorMvcAutoConfiguration详解

//@EnableWebMvc    加了这个会使Springmvc自动配置失效
@Configuration
public class MyWebMvcConfigurer implements WebMvcConfigurer {
    /**
     * 添加视图控制器
     * 立即访问
     * <mvc:view-controller path="/" view-name="index" />
     *
     * @param registry
     */
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/tuling").setViewName("hello");
    }

    /**
     * 添加拦截器
     *
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new TimeInterceptor())     //添加拦截器
                .addPathPatterns("/**")    // 拦截映射规则
                .excludePathPatterns("/pages/**");  // 设置排除的映射规则

        // 添加国际化拦截器
        registry.addInterceptor(new LocaleChangeInterceptor())
                .addPathPatterns("/**");    // 拦截映射规则
    }

    /**
     * 全局CORS配置
     *
     * @param
     * @Override public void addCorsMappings(CorsRegistry registry) {
     * registry.addMapping("/user/*")   // 映射服务器中那些http接口运行跨域访问
     * .allowedOrigins("http://localhost:8081")     // 配置哪些来源有权限跨域
     * .allowedMethods("GET","POST","DELETE","PUT");   // 配置运行跨域访问的请求方法
     * }
     */


    @Bean
    public LocaleResolver localeResolver() {
        CookieLocaleResolver cookieLocaleResolver = new CookieLocaleResolver();
        // 可以设置过期时间
        cookieLocaleResolver.setCookieMaxAge(60 * 60 * 24 * 30);
        cookieLocaleResolver.setCookieName("locale");
        return cookieLocaleResolver;
    }
}

@Controller
@RequestMapping("/error")
public class CustomErrorController extends AbstractErrorController {
    public CustomErrorController(ErrorAttributes errorAttributes, List<ErrorViewResolver> errorViewResolvers) {
        super(errorAttributes, errorViewResolvers);
    }

    Logger logger = LoggerFactory.getLogger(CustomErrorController.class);

    /**
     * 处理浏览器请求的
     * 加上异常日志记录
     *
     * @param request
     * @param response
     * @return
     */
    @RequestMapping(produces = MediaType.TEXT_HTML_VALUE)
    public ModelAndView errorHtml(HttpServletRequest request, HttpServletResponse response) {
        HttpStatus status = getStatus(request);
        Map<String, Object> model = Collections
                .unmodifiableMap(getErrorAttributes(request, getErrorAttributeOptions()));
        response.setStatus(status.value());
        ModelAndView modelAndView = resolveErrorView(request, response, status, model);
        logger.error(model.get("trace").toString());
        return (modelAndView != null) ? modelAndView : new ModelAndView("error", model);
    }

    /**
     * 处理ajax
     * 修改返回类型：Result 完成
     * 加上异常日志记录
     *
     * @param request
     * @return
     */
    @RequestMapping
    @ResponseBody
    public Result error(HttpServletRequest request) {
        HttpStatus status = getStatus(request);
        if (status == HttpStatus.NO_CONTENT) {
            return new Result(204, "No Content");
        }

        Map<String, Object> body = getErrorAttributes(request, getErrorAttributeOptions());
        String code = body.get("status").toString();
        String message = body.get("message").toString();
        logger.error(body.get("trace").toString());
        return new Result(Integer.parseInt(code), message);
    }


    /**
     * 异常信息的选项
     *
     * @return
     */
    protected ErrorAttributeOptions getErrorAttributeOptions() {
        ErrorAttributeOptions of = ErrorAttributeOptions.of(ErrorAttributeOptions.Include.MESSAGE,
                ErrorAttributeOptions.Include.STACK_TRACE,
                ErrorAttributeOptions.Include.EXCEPTION);
        return of;
    }


    @Override
    public String getErrorPath() {
        return null;
    }
}