SpringBoot中的static静态资源访问、参数配置、代码自定义访问规则详解

package org.springframework.boot.autoconfigure.web.servlet;
......省略部分......
public class WebMvcAutoConfiguration {
......省略部分......
        public void addResourceHandlers(ResourceHandlerRegistry registry) {
            if (!this.resourceProperties.isAddMappings()) {
                logger.debug("Default resource handling disabled");
            } else {
                // 将静态资源映射，都添加到映射中心
                this.addResourceHandler(registry, this.mvcProperties.getWebjarsPathPattern(), "classpath:/META-INF/resources/webjars/");
                this.addResourceHandler(registry, this.mvcProperties.getStaticPathPattern(), (registration) -> {
                    registration.addResourceLocations(this.resourceProperties.getStaticLocations());
                    if (this.servletContext != null) {
                        ServletContextResource resource = new ServletContextResource(this.servletContext, "/");
                        registration.addResourceLocations(new Resource[]{resource});
                    }
                });
            }
        }
......省略部分......
        private void addResourceHandler(ResourceHandlerRegistry registry, String pattern, Consumer<ResourceHandlerRegistration> customizer) {
            if (!registry.hasMappingForPattern(pattern)) {
                ResourceHandlerRegistration registration = registry.addResourceHandler(new String[]{pattern});
                customizer.accept(registration);
                registration.setCachePeriod(this.getSeconds(this.resourceProperties.getCache().getPeriod()));
                registration.setCacheControl(this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl());
                registration.setUseLastModified(this.resourceProperties.getCache().isUseLastModified());
                this.customizeResourceHandlerRegistration(registration);
            }
        }
......省略部分......
}

        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>3.6.1</version>
        </dependency>

package com.hh.springboottest.myController;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
    @RequestMapping("/static/baidu1.jpg")
    public String helloHandle() {
        return "hello springboot";
    }
}

spring:
  mvc:
    static-path-pattern: /static/**
  web:
    resources:
      static-locations: [classpath:/my-resources/]

import org.springframework.context.annotation.Configuration;
import org.springframework.http.CacheControl;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.concurrent.TimeUnit;
// @EnableWebMvc  // 禁用springBoot的默认配置
// 这是一个配置类。给容器中放一个WebMvcConfigurer组件，就能自定义底层。有以下两种方式
//     1. 可以让配置类实现WebMvcConfigurer接口
//     2. 可以在配置类中，将@Bean注解标注在方法上，然后方法返回WebMvcConfigurer
@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        // 默认就会保留以前规则
        // WebMvcConfigurer.super.addResourceHandlers(registry);
        // 自己添加新的规则
        registry.addResourceHandler("/my-static/**")
                .addResourceLocations("classpath:/static1/", "classpath:/static2/")
                .setCacheControl(CacheControl.maxAge(1180, TimeUnit.SECONDS));
    }
}