by shihang.mai

1. 注解

其实就是一个注释.而每个注解起的作用是基于反射实现的

java中的元注解

1.1 自定义注解

public @interface MyAnnotation {

    /**
     * 看起来像方法，但是实际上是使用时填写的参数的key名，默认的key名是value
     * 加上default是为了在使用时，不必填写所有的属性值
     */
    String name() default "msh";

    int age() default 18;

}

2. 获取yaml属性

3. 配置文件优先级

1. mshProject/config/application.yml
2. mshProject/application.yml
3. mshProject/src/main/resources/config/application.yml
4. mshProject/src/main/resources/application.yml

4. 静态资源

静态资源存放路径

• classpath:/META-INF/resources/
• classpath:/resources/
• classpath:/static/
• classpath:/public/

路径由下面代码找到

//WebMvcAutoConfiguration->WebMvcAutoConfigurationAdapter.addResourceHandlers()
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();
                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));
                }

                String staticPathPattern = this.mvcProperties.getStaticPathPattern();
                if (!registry.hasMappingForPattern(staticPathPattern)) {
                    this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(getResourceLocations(this.resourceProperties.getStaticLocations())).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));
                }

            }
 }

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

如果同名资源的话,按上面目录的优先级读取