Spring Boot custom error pages, whitelabel error page processing mode

I'm already a big fan of the spring framework Framework. For enterprise software developers, It provides a common solution to common problems, including those that you are unaware of in future Development. however, the Java EE project it builds has become bloated and needs to be replaced by a new Solution.

My biggest complaint is that the initial use of the Spring Framework build project is very slow and complex, such as building an MVC application with Jpa. To change this situation, Spring boot came into being.

Spring boot replaces the traditional way of building projects with the spring framework in a new microservices approach, which I have planned to use in subsequent project Development. It has helped us do 90% of the work and the remaining 10% of the work needs to be done by Ourselves. For me, the custom error page is one of Them. For example, 404 error, If Not processed, will appear "this application have no explicit mapping for/error, so is seeing this as a fallback." The error message,:

Spring boot uses embedded tomcat by default, with no page to handle common errors such as 404. therefore, in order to give the user the best experience, 404 Common errors need our custom page to Handle.

We need to use the Org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer class to implement this function, in spring Boot class (the Main method is in the same class), add the following code:

@Beanpublic EmbeddedServletContainerCustomizer containerCustomizer() {   return (container -> {        ErrorPage error401Page = new ErrorPage(HttpStatus.UNAUTHORIZED, "/401.html"); ErrorPage error404Page = new ErrorPage(HttpStatus.NOT_FOUND, "/404.html"); ErrorPage error500Page = new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/500.html"); container.addErrorPages(error401Page, error404Page, error500Page); });}

This is the way to simplify the implementation by using a lambda expression in Java 8, creating three ErrorPage instances in the code to handle three common HTTP error status codes and adding them to the Container. The ErrorPage class is a class that encapsulates the error message and can be used in jetty and Tomcat Environments.

This is an equivalent implementation of using a Java 7 inner class:

@Beanpublic embeddedservletcontainercustomizer  Containercustomizer () {return new Embeddedservletcontainercustomizer () { @Override public Span class= "hljs-keyword" >void customize (configurableembeddedservletcontainer container) {errorpage error401page = new errorpage (httpstatus.unauthorized,  "/401.html"); ErrorPage error404page = new errorpage (httpstatus.not_found,  " /404.html "); ErrorPage error500page = new errorpage (httpstatus.internal_server_error, "/500.html "); Container.adderrorpages (error401page, error404page, error500page); } };}

The error page needs to be placed in the static content directory of the spring Boot Web app, and its default location is: src/main/resources/static, as shown in:

Click on the link to download a compressed file of three files in the diagram, which are made using HTML5 Boilerplate.

now, you can see a simple version of the error page, you can according to your own needs to beautify it.

Compiled from: http://www.sporcic.org/2014/05/custom-error-pages-with-spring-boot/.

http://blog.csdn.net/github_32521685/article/details/50198467

Spring Boot custom error pages, whitelabel error page processing mode