spring boot 学习起步 九、错误处理

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class AppConfig extends WebMvcConfigurerAdapter implements EmbeddedServletContainerCustomizer{
    @Value("${characterEncoding}")
    String characterEncoding;

    @Bean
    public DispatcherServlet dispatcherServlet() {
        return new DispatcherServlet();
    }

    @Bean
    public CharacterEncodingFilter characterEncodingFilter() {
        CharacterEncodingFilter filter = new CharacterEncodingFilter();
        filter.setEncoding(characterEncoding);
        filter.setForceEncoding(true);
        return filter;
    }

    @Override
    public void customize(ConfigurableEmbeddedServletContainer factory) {
        factory.addErrorPages(new ErrorPage(HttpStatus.NOT_FOUND, "/404"));
        factory.addErrorPages(new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/500"));
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/**")
                .addResourceLocations("path to resources")
                .setCachePeriod(0);
    }

}

@Controller
public class IndexController {

	@RequestMapping("/404")
	public String page_404() {
		return "404";
	}

    @RequestMapping("/403")
    public String page_403() {
        return "403";
    }

	@RequestMapping("/500")
	public String page_500() {
		return "500";
	}

}