private enum LogApi {LOG4J, SLF4J_LAL, SLF4J, JUL}

public abstract class LogFactory {
    private static LogApi logApi = LogApi.JUL;
    static {
        ClassLoader cl = LogFactory.class.getClassLoader();
        try {
            // Try Log4j 2.x API
            cl.loadClass("org.apache.logging.log4j.spi.ExtendedLogger");
            logApi = LogApi.LOG4J;
        }
        catch (ClassNotFoundException ex1) {
            try {
                // Try SLF4J 1.7 SPI
                cl.loadClass("org.slf4j.spi.LocationAwareLogger");
                logApi = LogApi.SLF4J_LAL;
            }
            catch (ClassNotFoundException ex2) {
                try {
                    // Try SLF4J 1.7 API
                    cl.loadClass("org.slf4j.Logger");
                    logApi = LogApi.SLF4J;
                }
                catch (ClassNotFoundException ex3) {
                    // Keep java.util.logging as default
                }
            }
        }
    }
    public static Log getLog(String name) {
        switch (logApi) {
            case LOG4J:
                return Log4jDelegate.createLog(name);
            case SLF4J_LAL:
                return Slf4jDelegate.createLocationAwareLog(name);
            case SLF4J:
                return Slf4jDelegate.createLog(name);
            default:
                // Defensively use lazy-initializing delegate class here as well since the
                // java.logging module is not present by default on JDK 9. We are requiring
                // its presence if neither Log4j nor SLF4J is available; however, in the
                // case of Log4j or SLF4J, we are trying to prevent early initialization
                // of the JavaUtilLog adapter - e.g. by a JVM in debug mode - when eagerly
                // trying to parse the bytecode for all the cases of this switch clause.
                return JavaUtilDelegate.createLog(name);
        }
    }
}

dependencies {
    cglib("cglib:cglib:${cglibVersion}@jar")
    objenesis("org.objenesis:objenesis:${objenesisVersion}@jar")
    jarjar("com.googlecode.jarjar:jarjar:1.3")
    compile(files(cglibRepackJar))
    compile(files(objenesisRepackJar))
    compile(project(":spring-jcl"))
    optional("net.sf.jopt-simple:jopt-simple:5.0.4")
    optional("org.aspectj:aspectjweaver:${aspectjVersion}")
    optional("org.jetbrains.kotlin:kotlin-reflect:${kotlinVersion}")
    optional("org.jetbrains.kotlin:kotlin-stdlib:${kotlinVersion}")
    optional("io.projectreactor:reactor-core")
    optional("io.reactivex:rxjava:${rxjavaVersion}")
    optional("io.reactivex:rxjava-reactive-streams:${rxjavaAdapterVersion}")
    optional("io.reactivex.rxjava2:rxjava:${rxjava2Version}")
    optional("io.netty:netty-buffer")
    testCompile("io.projectreactor:reactor-test")
    testCompile("javax.xml.bind:jaxb-api:2.3.0")
    testCompile("org.apache.tomcat.embed:tomcat-embed-core:${tomcatVersion}")
    testCompile("com.fasterxml.woodstox:woodstox-core:5.0.3") {
        exclude group: "stax", module: "stax-api"
    }
    compile fileTree(dir: 'libs', include : '*.jar') //添加該行
}

@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Mapping
public @interface RequestMapping {
    String name() default "";
    @AliasFor("path")
    String[] value() default {};
    @AliasFor("value")
    String[] path() default {};
    RequestMethod[] method() default {};
    String[] params() default {};
    String[] headers() default {};
    String[] consumes() default {};
    String[] produces() default {};
}

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component  //注意要聲明父注解
public @interface Service {
    /**
     * The value may indicate a suggestion for a logical component name,
     * to be turned into a Spring bean in case of an autodetected component.
     * @return the suggested component name, if any (or empty String otherwise)
     */
    @AliasFor(annotation = Component.class)
    String value() default "";
}
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component  //注意要聲明父注解
public @interface Controller {
    /**
     * The value may indicate a suggestion for a logical component name,
     * to be turned into a Spring bean in case of an autodetected component.
     * @return the suggested component name, if any (or empty String otherwise)
     */
    @AliasFor(annotation = Component.class)
    String value() default "";
}

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.TYPE})
@Documented
@Inherited
public @interface MyAnnotation {
    @AliasFor(attribute = "location")
    String value() default "";
    @AliasFor(attribute = "value")
    String location() default "";
}
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.TYPE})
@Documented
@Inherited
@MyAnnotation  //注意要聲明父注解
public @interface SubMyAnnotation {
    @AliasFor(attribute = "value", annotation = MyAnnotation.class)
    String subValue() default "";
    @AliasFor(attribute = "location", annotation = MyAnnotation.class)
    String subLocation() default "";
//    subLocation屬性寫成下邊這兩種結果是一樣的
//    @AliasFor(attribute = "value", annotation = MyAnnotation.class)
//    String subLocation() default "";
//    @AliasFor(value = "location", annotation = MyAnnotation.class)
//    String subLocation() default "";
//
}

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(
    excludeFilters = {@Filter(
    type = FilterType.CUSTOM,
    classes = {TypeExcludeFilter.class}
), @Filter(
    type = FilterType.CUSTOM,
    classes = {AutoConfigurationExcludeFilter.class}
)}
)
public @interface SpringBootApplication {
    //復用@EnableAutoConfiguration注解的exclude屬性
    @AliasFor(annotation = EnableAutoConfiguration.class)
    Class<?>[] exclude() default {};
    //復用@EnableAutoConfiguration注解的excludeName屬性
    @AliasFor(annotation = EnableAutoConfiguration.class)
    String[] excludeName() default {};
    //復用@ComponentScan的basePackages屬性
    @AliasFor(annotation = ComponentScan.class,attribute = "basePackages")
    String[] scanBasePackages() default {};
    //復用@ComponentScan的basePackageClasses屬性
    @AliasFor(annotation = ComponentScan.class,attribute = "basePackageClasses")
    Class<?>[] scanBasePackageClasses() default {};
}

@RequestMapping("/test")
public class App{}
@Test
public void test(){
    RequestMapping springAnnotationProxy = AnnotationUtils.findAnnotation(App.class, RequestMapping.class);
    System.out.println("springAnnotationProxy path:" + springAnnotationProxy.path());
    System.out.println("springAnnotationProxy value:" + springAnnotationProxy.value());
    RequestMapping jdkAnnotation = App.class.getAnnotation(RequestMapping.class);
    System.out.println("jdkAnnotation path:" + jdkAnnotation.path());
    System.out.println("jdkAnnotation value:" + jdkAnnotation.value());
}

public static <A extends Annotation> A getAnnotation(Annotation ann, Class<A> annotationType)
public static <A extends Annotation> A getAnnotation(AnnotatedElement annotatedElement, Class<A> annotationType)
public static <A extends Annotation> A getAnnotation(Method method, Class<A> annotationType)
public static Annotation[] getAnnotations(AnnotatedElement annotatedElement)
public static Annotation[] getAnnotations(Method method)
// 獲取函數(shù)上或注解上的注解
        -   public static <A extends Annotation> A findAnnotation(AnnotatedElement annotatedElement, Class<A> annotationType)
            public static <A extends Annotation> A findAnnotation(Method method, @Nullable Class<A> annotationType)
            public static <A extends Annotation> A findAnnotation(Class<?> clazz, Class<A> annotationType)
            遞歸查找父注解
        -   public static boolean isAnnotationDeclaredLocally(Class<? extends Annotation> annotationType, Class<?> clazz)
            public static boolean isAnnotationInherited(Class<? extends Annotation> annotationType, Class<?> clazz)
            public static boolean isAnnotationMetaPresent(Class<? extends Annotation> annotationType, @Nullable Class<? extends Annotation> metaAnnotationType)
            是否聲明了/繼承了某個注解
        -   public static Map<String, Object> getAnnotationAttributes(Annotation annotation)
            public static Map<String, Object> getAnnotationAttributes(Annotation annotation, boolean classValuesAsString)
            public static AnnotationAttributes getAnnotationAttributes(@Nullable AnnotatedElement annotatedElement, Annotation annotation)
            獲取注解的所有屬性，返回 AnnotationAttributes
        -   public static Object getValue(Annotation annotation)
            public static Object getValue(@Nullable Annotation annotation, @Nullable String attributeName)
            public static Object getDefaultValue(Annotation annotation)
            public static Object getDefaultValue(@Nullable Annotation annotation, @Nullable String attributeName)
            public static Object getDefaultValue(Class<? extends Annotation> annotationType)
            public static Object getDefaultValue(@Nullable Class<? extends Annotation> annotationType, @Nullable String attributeName)
    獲取注解的值以及默認值