https://docs.spring.io/spring-boot/docs/1.5.10.RELEASE/reference/htmlsingle/#boot-features-developing-web-applications
1. Spring MVC auto-configuration
Spring Boot 自动配置好了SpringMVC
以下是SpringBoot对SpringMVC的默认配置:==(WebMvcAutoConfiguration)==
- Inclusion of
ContentNegotiatingViewResolver
andBeanNameViewResolver
beans. - 自动配置了ViewResolver(视图解析器:根据方法的返回值得到视图对象(View),视图对象决定如何渲染(转发?重定向?))
- ContentNegotiatingViewResolver:组合所有的视图解析器的;
- ==如何定制:我们可以自己给容器中添加一个视图解析器;自动的将其组合进来;==
- Support for serving static resources, including support for WebJars (see below).静态资源文件夹路径,webjars
- Static
index.html
support. 静态首页访问 - Custom
Favicon
support (see below). favicon.ico - 自动注册了 of
Converter
,GenericConverter
,Formatter
beans. - Converter:转换器; public String hello(User user):类型转换使用Converter
Formatter
格式化器; 2017.12.17===Date;
@Bean
@ConditionalOnProperty(prefix = "spring.mvc", name = "date-format")//在文件中配置日期格式化的规则
public Formatter<Date> dateFormatter() {
return new DateFormatter(this.mvcProperties.getDateFormat());//日期格式化组件
}
代码语言:txt复制==自己添加的格式化器转换器,我们只需要放在容器中即可==
- Support for
HttpMessageConverters
(see below). - HttpMessageConverter:SpringMVC用来转换Http请求和响应的;User---Json;
HttpMessageConverters
是从容器中确定;获取所有的HttpMessageConverter;
==自己给容器中添加HttpMessageConverter,只需要将自己的组件注册容器中(@Bean,@Component)==
- Automatic registration of
MessageCodesResolver
(see below).定义错误代码生成规则 - Automatic use of a
ConfigurableWebBindingInitializer
bean (see below).
==我们可以配置一个ConfigurableWebBindingInitializer来替换默认的;(添加到容器)==
代码语言:txt复制
初始化WebDataBinder;
请求数据=====JavaBean;
代码语言:txt复制
org.springframework.boot.autoconfigure.web:web的所有自动场景;
If you want to keep Spring Boot MVC features, and you just want to add additional MVC configuration (interceptors, formatters, view controllers etc.) you can add your own @Configuration
class of type WebMvcConfigurerAdapter
, but without @EnableWebMvc
. If you wish to provide custom instances of RequestMappingHandlerMapping
, RequestMappingHandlerAdapter
or ExceptionHandlerExceptionResolver
you can declare a WebMvcRegistrationsAdapter
instance providing such components.
If you want to take complete control of Spring MVC, you can add your own @Configuration
annotated with @EnableWebMvc
.
2、扩展SpringMVC
代码语言:txt复制 <mvc:view-controller path="/hello" view-name="success"/>
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/hello"/>
<bean></bean>
</mvc:interceptor>
</mvc:interceptors>
==编写一个配置类(@Configuration),是WebMvcConfigurerAdapter类型;不能标注@EnableWebMvc==;
既保留了所有的自动配置,也能用我们扩展的配置;
代码语言:txt复制//使用WebMvcConfigurerAdapter可以来扩展SpringMVC的功能
@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {
@Override
public void addViewControllers(ViewControllerRegistry registry) {
// super.addViewControllers(registry);
//浏览器发送 /atguigu 请求来到 success
registry.addViewController("/atguigu").setViewName("success");
}
}
原理:
代码语言:txt复制1)、WebMvcAutoConfiguration是SpringMVC的自动配置类
代码语言:txt复制2)、在做其他自动配置时会导入;@Import(**EnableWebMvcConfiguration**.class)
代码语言:txt复制 @Configuration
public static class EnableWebMvcConfiguration extends DelegatingWebMvcConfiguration {
private final WebMvcConfigurerComposite configurers = new WebMvcConfigurerComposite();
//从容器中获取所有的WebMvcConfigurer
@Autowired(required = false)
public void setConfigurers(List<WebMvcConfigurer> configurers) {
if (!CollectionUtils.isEmpty(configurers)) {
this.configurers.addWebMvcConfigurers(configurers);
//一个参考实现;将所有的WebMvcConfigurer相关配置都来一起调用;
@Override
// public void addViewControllers(ViewControllerRegistry registry) {
// for (WebMvcConfigurer delegate : this.delegates) {
// delegate.addViewControllers(registry);
// }
}
}
}
代码语言:txt复制3)、容器中所有的WebMvcConfigurer都会一起起作用;
代码语言:txt复制4)、我们的配置类也会被调用;
代码语言:txt复制效果:SpringMVC的自动配置和我们的扩展配置都会起作用;