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//添加靜態(tài)資源規(guī)則
public void addResourceHandlers(ResourceHandlerRegistry registry) {
      if (!this.resourceProperties.isAddMappings()) {
        logger.debug("Default resource handling disabled");
      } else {
        Duration cachePeriod = this.resourceProperties.getCache().getPeriod();
        CacheControl cacheControl = this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl();
        //webjars依賴映射規(guī)則
        if (!registry.hasMappingForPattern("/webjars/**")) {
          this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{"/webjars/**"}).addResourceLocations(new String[]{"classpath:/META-INF/resources/webjars/"}).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));
        }
				//本地配置的映射規(guī)則
        //this.resourceProperties.getStaticLocations() 從ResourceProperties中加載靜態(tài)路徑
        String staticPathPattern = this.mvcProperties.getStaticPathPattern();
        if (!registry.hasMappingForPattern(staticPathPattern)) {
          this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(WebMvcAutoConfiguration.getResourceLocations            this.resourceProperties.getStaticLocations())).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));
        }

      }
    }

@ConfigurationProperties(
  prefix = "spring.resources",
  ignoreUnknownFields = false
)
public class ResourceProperties {
  //springboot默認的加載路徑
  private static final String[] CLASSPATH_RESOURCE_LOCATIONS = new String[]{"classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/"};
  private String[] staticLocations;
  private boolean addMappings;
  private final ResourceProperties.Chain chain;
  private final ResourceProperties.Cache cache;

 
      org.webjars
      jquery
      3.3.1-2