Spring Boot Web相关配置

经过WebMvcAutoConfiguration发现Spring Boot作了许多自动配置。

  1.自动配置的VeiwResolver

1. ContentNegotiatingViewResolver：自身不处理view，而是代理给不一样的ViewResovler来处理不一样的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;
       }

    

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

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

    

3. InternalResourceViewResolver：主要经过设置前缀、后缀以及控制器方法中返回的视图名字符串获得实际页面。

   @Bean
   @ConditionalOnMissingBean
   public 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方法中定义了如下静态资源配置，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));
            }

        }
    }

1. 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/**。

2. webjar 

         将经常使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/**，能够经过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);
        }

    }

只要咱们程序中自定义了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

@Autowired
private HttpMessageConverters messageConverters;

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

若是要新增自定义的HttpMessageConverter，则只要定义一个本身的HttpMessageConverters的Bean，在Bean中注册 定义好的HttpMessageConverter便可。

@Bean
public 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