SpringBoot 2.0 之错误页面配置

- 1. 默认配置
- - 1.1 配置
  - 2.2 调试过程：
- 2. 自定义配置
- - 2.1 源码解读
  - 2.2 配置

1. 默认配置

1.1 配置

根据错误码匹配，如下：

目录	访问优先级	目录配置
classpath:/META-INF/resources/	最高	/error/404.html 或 /error/4xx.html
classpath:/resources/	-	/error/404.html 或 /error/4xx.html
classpath:/static/	-	/error/404.html 或 /error/4xx.html
classpath:/public/	-	/error/404.html 或 /error/4xx.html

2.2 调试过程：

在application.yml 里面将日志级别调为debug

logging:level.org: DEBUG

访问一个不存在的资源

系统会打印如下日志：

    : getResource(META-INF/resources/error/404.html)--> Resource not found, returning null: getResource(resources/error/404.html)--> Resource not found, returning null: getResource(static/error/404.html)--> Resource not found, returning null: getResource(public/error/404.html)--> Resource not found, returning null: getResource(META-INF/resources/error/4xx.html)--> Resource not found, returning null: getResource(resources/error/4xx.html):   --> Resource not found, returning null: getResource(static/error/4xx.html):   --> Resource not found, returning null: getResource(public/error/4xx.html): getResourceAsStream(public/error/4xx.html): Exiting from "ERROR" dispatch, status 404

详细日志：

2020-09-14 18:00:28.679 DEBUG 6720 --- [nio-8080-exec-8] o.a.t.util.http.Rfc6265CookieProcessor   : Cookies: Parsing b[]: JSESSIONID=3768F0D323A90FB70F40609ECF80E636
2020-09-14 18:00:28.680 DEBUG 6720 --- [nio-8080-exec-8] o.a.catalina.connector.CoyoteAdapter     :  Requested cookie session id is 3768F0D323A90FB70F40609ECF80E636
2020-09-14 18:00:28.680 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.authenticator.AuthenticatorBase    : Security checking request GET /index5.html
2020-09-14 18:00:28.681 DEBUG 6720 --- [nio-8080-exec-8] org.apache.catalina.realm.RealmBase      :   No applicable constraints defined
2020-09-14 18:00:28.681 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.authenticator.AuthenticatorBase    : Not subject to any constraint
2020-09-14 18:00:28.682 DEBUG 6720 --- [nio-8080-exec-8] org.apache.tomcat.util.http.Parameters   : Set encoding to UTF-8
2020-09-14 18:00:28.682 DEBUG 6720 --- [nio-8080-exec-8] o.s.web.servlet.DispatcherServlet        : GET "/index5.html", parameters={}
2020-09-14 18:00:28.685 DEBUG 6720 --- [nio-8080-exec-8] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ResourceHttpRequestHandler ["classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/", "/"]
2020-09-14 18:00:28.691 DEBUG 6720 --- [nio-8080-exec-8] o.s.w.s.r.ResourceHttpRequestHandler     : Resource not found
2020-09-14 18:00:28.691 DEBUG 6720 --- [nio-8080-exec-8] o.s.web.servlet.DispatcherServlet        : Completed 404 NOT_FOUND
2020-09-14 18:00:28.693 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.c.C.[Tomcat].[localhost]           : Processing ErrorPage[errorCode=0, location=/error]
2020-09-14 18:00:28.698 DEBUG 6720 --- [nio-8080-exec-8] o.s.web.servlet.DispatcherServlet        : "ERROR" dispatch for GET "/error", parameters={}
2020-09-14 18:00:28.700 DEBUG 6720 --- [nio-8080-exec-8] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#errorHtml(HttpServletRequest, HttpServletResponse)
2020-09-14 18:00:28.723 DEBUG 6720 --- [nio-8080-exec-8] o.s.c.e.PropertySourcesPropertyResolver  : Found key 'spring.template.provider.cache' in PropertySource 'configurationProperties' with value of type String
2020-09-14 18:00:28.725 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(freemarker.template.Configuration)
2020-09-14 18:00:28.728 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.728 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(freemarker.template$Configuration)
2020-09-14 18:00:28.731 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.731 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(com.samskivert.mustache.Template)
2020-09-14 18:00:28.732 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.733 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(com.samskivert.mustache$Template)
2020-09-14 18:00:28.735 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.735 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(groovy.text.TemplateEngine)
2020-09-14 18:00:28.735 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.736 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(groovy.text$TemplateEngine)
2020-09-14 18:00:28.738 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.738 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(org.thymeleaf.spring5.SpringTemplateEngine)
2020-09-14 18:00:28.743 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.744 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(org.thymeleaf.spring5$SpringTemplateEngine)
2020-09-14 18:00:28.746 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.746 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(org.apache.jasper.compiler.JspConfig)
2020-09-14 18:00:28.748 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.749 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(org.apache.jasper.compiler$JspConfig)
2020-09-14 18:00:28.750 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.750 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       : getResource(META-INF/resources/error/404.html)
2020-09-14 18:00:28.751 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   Delegating to parent classloader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@2e0c56f1
2020-09-14 18:00:28.751 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   --> Resource not found, returning null
2020-09-14 18:00:28.751 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       : getResource(resources/error/404.html)
2020-09-14 18:00:28.751 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   Delegating to parent classloader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@2e0c56f1
2020-09-14 18:00:28.751 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   --> Resource not found, returning null
2020-09-14 18:00:28.752 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       : getResource(static/error/404.html)
2020-09-14 18:00:28.752 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   Delegating to parent classloader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@2e0c56f1
2020-09-14 18:00:28.752 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   --> Resource not found, returning null
2020-09-14 18:00:28.752 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       : getResource(public/error/404.html)
2020-09-14 18:00:28.752 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   Delegating to parent classloader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@2e0c56f1
2020-09-14 18:00:28.752 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   --> Resource not found, returning null
2020-09-14 18:00:28.753 DEBUG 6720 --- [nio-8080-exec-8] o.s.c.e.PropertySourcesPropertyResolver  : Found key 'spring.template.provider.cache' in PropertySource 'configurationProperties' with value of type String
2020-09-14 18:00:28.753 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(freemarker.template.Configuration)
2020-09-14 18:00:28.753 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.754 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(freemarker.template$Configuration)
2020-09-14 18:00:28.754 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.756 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(com.samskivert.mustache.Template)
2020-09-14 18:00:28.758 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.758 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(com.samskivert.mustache$Template)
2020-09-14 18:00:28.759 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.760 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(groovy.text.TemplateEngine)
2020-09-14 18:00:28.760 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.762 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(groovy.text$TemplateEngine)
2020-09-14 18:00:28.762 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.762 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(org.thymeleaf.spring5.SpringTemplateEngine)
2020-09-14 18:00:28.763 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.764 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(org.thymeleaf.spring5$SpringTemplateEngine)
2020-09-14 18:00:28.764 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.764 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(org.apache.jasper.compiler.JspConfig)
2020-09-14 18:00:28.765 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.765 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     findClass(org.apache.jasper.compiler$JspConfig)
2020-09-14 18:00:28.765 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :     --> Returning ClassNotFoundException
2020-09-14 18:00:28.765 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       : getResource(META-INF/resources/error/4xx.html)
2020-09-14 18:00:28.766 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   Delegating to parent classloader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@2e0c56f1
2020-09-14 18:00:28.766 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   --> Resource not found, returning null
2020-09-14 18:00:28.766 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       : getResource(resources/error/4xx.html)
2020-09-14 18:00:28.766 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   Delegating to parent classloader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@2e0c56f1
2020-09-14 18:00:28.767 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   --> Resource not found, returning null
2020-09-14 18:00:28.767 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       : getResource(static/error/4xx.html)
2020-09-14 18:00:28.767 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   Delegating to parent classloader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@2e0c56f1
2020-09-14 18:00:28.767 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   --> Resource not found, returning null
2020-09-14 18:00:28.767 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       : getResource(public/error/4xx.html)
2020-09-14 18:00:28.767 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   Delegating to parent classloader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@2e0c56f1
2020-09-14 18:00:28.768 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   --> Returning 'file:/E:/%e5%ad%a6%e4%b9%a0%e8%b5%84%e6%96%99/vue/workspace/spring-boot-study/spring-boot-resources-study/target/classes/public/error/4xx.html'
2020-09-14 18:00:28.773 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       : getResourceAsStream(public/error/4xx.html)
2020-09-14 18:00:28.773 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   Delegating to parent classloader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@2e0c56f1
2020-09-14 18:00:28.774 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.loader.WebappClassLoaderBase       :   --> Returning stream from parent
2020-09-14 18:00:28.777 DEBUG 6720 --- [nio-8080-exec-8] o.s.web.servlet.DispatcherServlet        : Exiting from "ERROR" dispatch, status 404
2020-09-14 18:00:28.778 DEBUG 6720 --- [nio-8080-exec-8] o.a.c.c.C.[.[.[/].[dispatcherServlet]    :  Disabling the response for further output

2. 自定义配置

2.1 源码解读

org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration

错误页面配置

从源码分析，默认会调用 StaticView defaultErrorView = new StaticView();

@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(prefix = "server.error.whitelabel", name = "enabled", matchIfMissing = true)@Conditional(ErrorTemplateMissingCondition.class)protected static class WhitelabelErrorViewConfiguration {private final StaticView defaultErrorView = new StaticView();@Bean(name = "error")@ConditionalOnMissingBean(name = "error")public View defaultErrorView() {return this.defaultErrorView;}// If the user adds @EnableWebMvc then the bean name view resolver from// WebMvcAutoConfiguration disappears, so add it back in to avoid disappointment.@Bean@ConditionalOnMissingBeanpublic BeanNameViewResolver beanNameViewResolver() {BeanNameViewResolver resolver = new BeanNameViewResolver();resolver.setOrder(Ordered.LOWEST_PRECEDENCE - 10);return resolver;}}

StaticView 代码

	/*** Simple {@link View} implementation that writes a default HTML error page.*/private static class StaticView implements View {private static final MediaType TEXT_HTML_UTF8 = new MediaType("text", "html", StandardCharsets.UTF_8);private static final Log logger = LogFactory.getLog(StaticView.class);@Overridepublic void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response)throws Exception {if (response.isCommitted()) {String message = getMessage(model);logger.error(message);return;}response.setContentType(TEXT_HTML_UTF8.toString());StringBuilder builder = new StringBuilder();Date timestamp = (Date) model.get("timestamp");Object message = model.get("message");Object trace = model.get("trace");if (response.getContentType() == null) {response.setContentType(getContentType());}builder.append("<html><body><h1>Whitelabel Error Page</h1>").append("<p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p>").append("<div id='created'>").append(timestamp).append("</div>").append("<div>There was an unexpected error (type=").append(htmlEscape(model.get("error"))).append(", status=").append(htmlEscape(model.get("status"))).append(").</div>");if (message != null) {builder.append("<div>").append(htmlEscape(message)).append("</div>");}if (trace != null) {builder.append("<div style='white-space:pre-wrap;'>").append(htmlEscape(trace)).append("</div>");}builder.append("</body></html>");response.getWriter().append(builder.toString());}private String htmlEscape(Object input) {return (input != null) ? HtmlUtils.htmlEscape(input.toString()) : null;}private String getMessage(Map<String, ?> model) {Object path = model.get("path");String message = "Cannot render error page for request [" + path + "]";if (model.get("message") != null) {message += " and exception [" + model.get("message") + "]";}message += " as the response has already been committed.";message += " As a result, the response may have the wrong status code.";return message;}@Overridepublic String getContentType() {return "text/html";}}

2.2 配置

根据上面源码分析，只要自己只要自定义一个View覆盖源码中的View即可，具体操作如下：

在application.yml中配置

  server.error.whitelabel.enable = true  #默认为true

自定义View

 public class GlobalErrorView implements View {@Overridepublic String getContentType() {return MediaType.TEXT_HTML_VALUE;}@Overridepublic void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response) throws Exception {request.getRequestDispatcher("/error.html").forward(request,response);}}

覆盖原来的View

@Configuration
public class GlobalErrorConfig {@Bean("error")public View error() {return new GlobalErrorView();}
}

启动服务后就会发现，原来的访问的“Whitelabel Error Page”配置页面,已经变成了自己定义的页面。

注意：
系统默认会找 /error/404.html ，没有找到会跳转到 error

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2.2 调试过程：

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