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This article will explain in detail how to customize the Web MVC configuration of Spring Boot. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

0. Prepare for

Spring Boot not only provides automatic configuration features that are fairly easy to use, but also opens up very free and flexible configuration classes. Spring MVC provides us with the WebMvcConfigurationSupport class and an annotation @ EnableWebMvc to help us reduce the declaration of configuring Bean. This article briefly explains how to customize the Web MVC configuration. First, you need to use @ Configuration to label the WebMvcConfig class as the Spring configuration class. The sample code is as follows:

@ Configurationpublic class WebMvcConfig extends WebMvcConfigurationSupport {/ / override} by overriding the configuration method

And add @ EnableWebMvc to the startup class, as follows:

@ SpringBootApplication@MapperScan ("cn.zwqh.springboot.dao") @ EnableWebMvc / / enable Spring MVC configuration public class SpringBootSsmThymeleafApplication {public static void main (String [] args) {SpringApplication.run (SpringBootSsmThymeleafApplication.class, args);}} 1. Static resource allocation

The default static resource configuration in Spring Boot is to map the static files in the / static, / public, / resources and / METAINF/resources directories under the classpath or the root directory of ServletContext directly to / *. It uses ResourceHttpRequestHandler from Spring MVC so that you can modify this behavior by adding your own WebMvcConfigurer and overriding the addResourceHandlers method. The sample code is as follows:

@ Override public void addResourceHandlers (ResourceHandlerRegistry registry) {registry.addResourceHandler ("/ statics/**") .addResourceLocations ("classpath:/statics/"); / / static resource path registry.addResourceHandler such as css,js,img ("/ templates/**") .addResourceLocations ("classpath:/templates/"); / / View registry.addResourceHandler ("/ mapper/**") .addResourceLocations ("classpath:/mapper/") / / mapper.xml super.addResourceHandlers (registry);} 2. Interceptor configuration

Add the interceptor HandlerInterceptor by overriding the addInterceptors () method and registering the class with InterceptorRegistry. The sample code is as follows:

@ Autowired private BeforMethodInteceptor beforMethodInteceptor @ Override public void addInterceptors (InterceptorRegistry registry) {/ / register custom interceptor Add interceptor path and exclude interceptor path registry.addInterceptor (beforMethodInteceptor) / / add interceptor .addPathPatterns ("/ * *") / / add interceptor path .intercepdePathPatterns (/ / add exclusion interceptor path "/ index", "/ login" "/ doLogin", "/ logout", "/ register", "/ doRegister", "/ * * / * .css", "/ * * / * .png" "/ * / * .jpeg", "/ * * / * .jpg", "/ * * / * .ico", "/ * * / * .js" "/ swagger-resources/**") Super.addInterceptors (registry); 3. Cross-domain configuration

Support for cross-domain configuration is achieved by overriding the addCorsMappings method and adding path maps using the CorsRegistry registration class. The sample code is as follows:

@ Override public void addCorsMappings (CorsRegistry registry) {registry.addMapping ("/ * *") / / configure the path that allows cross-domain access. AllowedOrigins ("*") / / configure the request domain name .allowedMethods ("PUT,POST,GET,DELETE") of cross-domain resources that are allowed to be accessed OPTIONS ") / / configure the request method that allows access to the cross-domain resource server For example: POST, GET, PUT, DELETE, etc. AllowedHeaders ("*") / / configure to allow access to the request header, such as X-TOKEN super.addCorsMappings (registry);} 4. View Controller configuration

By overriding the addViewControllers method, use the ViewControllerRegistry registration class to implement the view controller configuration. The sample code is as follows:

@ Override public void addViewControllers (ViewControllerRegistry registry) {registry.addViewController ("/") .setViewName ("/ index"); / / default view jump registry.addViewController ("/ index") .setViewName ("/ index"); registry.addViewController ("/ article") .setViewName ("/ article"); registry.addViewController ("/ error/404") .setViewName ("/ error/404") Registry.addViewController ("/ error/500"). SetViewName ("/ error/500"); registry.setOrder (Ordered.HIGHEST_PRECEDENCE); super.addViewControllers (registry);}

The above code is equivalent to the following code:

@ RequestMapping (value = {"/", "/ index"}) public String index () {return "index";} @ RequestMapping (value = "article") public String article () {return "article";} @ RequestMapping (value = "/ error/404") public String error_404 () {return "/ error/404" } @ RequestMapping (value = "/ error/500") public String error_500 () {return "/ error/500";} 5. Message translator configuration

Configure the message converter by overriding the override configureMessageConverters method. The sample code is as follows: custom string converter:

@ Override public void configureMessageConverters (List > converters) {super.configureMessageConverters (converters); / / 1. You need to define an object for the convert transformation message; FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter (); / / 2. Add configuration information for fastJson, such as: whether to format the returned json data; FastJsonConfig fastJsonConfig = new FastJsonConfig (); fastJsonConfig.setSerializerFeatures (SerializerFeature.PrettyFormat); / / 3 deal with Chinese garbled List fastMediaTypes = new ArrayList (); fastMediaTypes.add (MediaType.APPLICATION_JSON_UTF8); / / 4. Add configuration information to convert. FastJsonHttpMessageConverter.setSupportedMediaTypes (fastMediaTypes); fastJsonHttpMessageConverter.setFastJsonConfig (fastJsonConfig); / / 5. Add convert to converters. Converters.add (fastJsonHttpMessageConverter);} 6 Data formatter configuration

Add a data formatter by overriding the addFormatters method. Spring MVC accepts the HTTP request and automatically binds the parameters to the Controller request parameters. There is no default configuration in Spring to convert strings to date types. At this point, you can achieve automatic conversion by adding a DateFormatter class. The sample code is as follows:

@ Override public void addFormatters (FormatterRegistry registry) {super.addFormatters (registry); registry.addFormatter (new DateFormatter ("yyyy-MM-dd"));} 7. View parser configuration

Configure the view parser by overriding the override configureViewResolvers () method. The code example is as follows:

@ Override public void configureViewResolvers (ViewResolverRegistry registry) {InternalResourceViewResolver viewResolver = new InternalResourceViewResolver (); viewResolver.setPrefix (""); viewResolver.setSuffix (".html"); viewResolver.setCache (false); viewResolver.setContentType ("text/html;charset=UTF-8"); viewResolver.setOrder (0) Registry.viewResolver (viewResolver); super.configureViewResolvers (registry);} this is the end of how to customize Web MVC configuration for Spring Boot. I hope the above content can be helpful to you and learn more. If you think the article is good, you can share it for more people to see.

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