springboot webmvc 自动配置

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通过WebMvcAutoConfiguration发现Spring Boot做了许多自动配置。

1.自动配置的VeiwResolver

ContentNegotiatingViewResolver：自身不处理view，而是代理给不同的ViewResovler来处理不同的view，优先级最高。

public ContentNegotiatingViewResolver viewResolver(BeanFactory beanFactory) {        ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver();        resolver.setContentNegotiationManager((ContentNegotiationManager)beanFactory.getBean(ContentNegotiationManager.class));        resolver.setOrder(-2147483648);        return resolver;    }

BeanNameViewResolver：根据controller方法中返回的字符串的view来渲染视图。

@Bean@ConditionalOnBean({View.class})@ConditionalOnMissingBeanpublic BeanNameViewResolver beanNameViewResolver() {     BeanNameViewResolver resolver = new BeanNameViewResolver();     resolver.setOrder(2147483637);     return resolver;}

InternalResourceViewResolver：主要通过设置前缀、后缀以及控制器方法中返回的视图名字符串得到实际页面。

@Bean@ConditionalOnMissingBeanpublic InternalResourceViewResolver defaultViewResolver() {     InternalResourceViewResolver resolver = new InternalResourceViewResolver();     resolver.setPrefix(this.mvcProperties.getView().getPrefix());     esolver.setSuffix(this.mvcProperties.getView().getSuffix());     return resolver;}

2.自动配置的静态资源

在自动配置类中addResourceHandlers方法中定义了以下静态资源配置，可继承起抽象父类，覆写该方法进行扩展。

public void addResourceHandlers(ResourceHandlerRegistry registry) {        if(!this.resourceProperties.isAddMappings()) {            logger.debug("Default resource handling disabled");        } else {            Integer cachePeriod = this.resourceProperties.getCachePeriod();            if(!registry.hasMappingForPattern("/webjars/**")) {                this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{"/webjars/**"}).addResourceLocations(new String[]{"classpath:/META-INF/resources/webjars/"}).setCachePeriod(cachePeriod));            }            String staticPathPattern = this.mvcProperties.getStaticPathPattern();            if(!registry.hasMappingForPattern(staticPathPattern)) {                this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(this.resourceProperties.getStaticLocations()).setCachePeriod(cachePeriod));            }        }    }

类路径文件

private static final String[] CLASSPATH_RESOURCE_LOCATIONS = new String[]{"classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/"};

把类路径下的/static、/public、/resources和/META-INF/resources文件夹下的静态文件直接映射为/**。

webjar

将常用的脚本框架封装在jar包中，把webjar的/META-INF/resources/webjars/下的静态文件映射为/webjar/**，可以通过http://ip:port/webjar/**访问。

3.自动配置的Formatter和Converter

public void addFormatters(FormatterRegistry registry) {        Iterator var2 = this.getBeansOfType(Converter.class).iterator();        while(var2.hasNext()) {            Converter formatter = (Converter)var2.next();            registry.addConverter(formatter);        }        var2 = this.getBeansOfType(GenericConverter.class).iterator();        while(var2.hasNext()) {            GenericConverter formatter1 = (GenericConverter)var2.next();            registry.addConverter(formatter1);        }        var2 = this.getBeansOfType(org.springframework.format.Formatter.class).iterator();        while(var2.hasNext()) {            org.springframework.format.Formatter formatter2 = (org.springframework.format.Formatter)var2.next();            registry.addFormatter(formatter2);        }    }

只要我们程序中自定义了Converter、GenericConverter和Formatter接口的实现类Bean，这些Bean就会自动注册到Spring MVC中。

4.自动配置的HttpMessageConverters

WebMvcAutoConfiguration中，注册了messageConverters

@Autowiredprivate HttpMessageConverters messageConverters;public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {    converters.addAll(this.messageConverters.getConverters());}

如果要新增自定义的HttpMessageConverter，则只要定义一个自己的HttpMessageConverters的Bean，在Bean中注册定义好的HttpMessageConverter即可。

@Beanpublic HttpMessageConverters customConverters(){    HttpMessageConverter customConverter1 = new CustomConverter();    HttpMessageConverter customConverter2 = new CustomConverter();    return new HttpMessageConverters(customConverter1 ,customConverter2);}

5.静态首页的支持

classpath:/META-INF/resources/index.html

classpath:/resources/index.html

classpath:/static/index.html

classpath:/public/index.html

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