SpringBoot异常处理机制之自定义40500错误提示页面 - 518篇

import org.springframework.boot.web.server.ConfigurableWebServerFactory;
import org.springframework.boot.web.servlet.server.ConfigurableServletWebServerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
 
@Configuration
public class ErrorPageConfig {
 
    @Bean
    public ConfigurableServletWebServerFactory servletWebServerFactory() {
        ConfigurableServletWebServerFactory factory = new TomcatServletWebServerFactory();
        factory.setErrorPages(new ErrorPage(HttpStatus.NOT_FOUND, "/error-404.html"),
                              new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/error-500.html"));
        return factory;
    }
 
    @Bean
    public SimpleUrlHandlerMapping customErrorPages() {
        SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();
        Properties mappings = new Properties();
        mappings.setProperty("/**/favicon.ico", "faviconFallback");
        handlerMapping.setUrlMap(mappings);
        return handlerMapping;
    }
 
    @Bean(name = "faviconFallback")
    public SimpleControllerHandlerAdapter faviconFallback() {
        return new SimpleControllerHandlerAdapter((request, response) -> {
            Resource favicon = new ClassPathResource("/static/images/favicon.ico"); // 确保路径正确
            if (favicon.exists()) {
                // 将favicon文件写入响应流
                try (InputStream inputStream = favicon.getInputStream()) {
                    FileCopyUtils.copy(inputStream, response.getOutputStream());
                } catch (IOException e) {
                    throw new RuntimeException("Failed to write favicon", e);
                }
            } else {
                // 如果文件不存在，可以选择其他策略，比如返回默认favicon或者空响应
                // ...
            }
        });
    }
}

这个代码示例展示了如何在Spring Boot应用中配置自定义的错误页面，以及如何处理favicon.ico文件缺失的情况。通过使用ErrorPage和SimpleUrlHandlerMapping，我们可以为404和500错误指定自定义页面，同时提供了一个示例来处理favicon.ico文件的回退。