package com.cglibs;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

// 适用类、接口（包括注解类型）或枚举

@Retention(RetentionPolicy.RUNTIME)

@Target(ElementType.TYPE)

public @interface ClassInfo {

    String value();

}

package com.cglibs;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

// 适用field属性，也包括enum常量

@Retention(RetentionPolicy.RUNTIME)

@Target(ElementType.FIELD)

public @interface FieldInfo {

    int[] value();

}

package com.cglibs;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

// 适用方法

@Retention(RetentionPolicy.RUNTIME)

@Target(ElementType.METHOD)

public @interface MethodInfo {

    String name() default "long";

    String data();

    int age() default 27;

}

//

// Source code recreated from a .class file by IntelliJ IDEA

// (powered by Fernflower decompiler)

//

package com.cglibs;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

@Target({ElementType.PARAMETER})

@Retention(RetentionPolicy.RUNTIME)

public @interface AutoUserModel {

    boolean value() default true;

    boolean require() default true;

    String message() default "user is null";

}

package com.cglibs;

/**

 * 测试运行时注解

 */

@ClassInfo("Test Class")

public class RuntimeAnnotation {

    @FieldInfo(value = {1, 2})

    public String fieldInfo = "FiledInfo";

    @FieldInfo(value = {10086})

    public int i = 100;

    @MethodInfo(name = "BlueBird", data = "Big")

    public static String getMethodInfo(@AutoUserModel(value = false,require = true) @AutoPlatformModel String a) {

        System.out.println("RuntimeAnnotation.getMethodInfo "+a);

        return RuntimeAnnotation.class.getSimpleName();

    }

}

package com.cglibs;

import java.lang.annotation.Annotation;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.lang.reflect.Modifier;

import java.util.Arrays;

/**

 * 测试运行时注解

 */

public class TestRuntimeAnnotation {

    /**

     * 测试运行时注解

     */

    public static void main(String[] args) {

        StringBuilder sb = new StringBuilder();

        Class<?> cls = RuntimeAnnotation.class;

        // 获取指定类型的注解

        sb.append("Class注解：").append("\n");

        ClassInfo classInfo = cls.getAnnotation(ClassInfo.class);

        if (classInfo != null) {

            sb.append(Modifier.toString(cls.getModifiers())).append(" ")

                    .append(cls.getSimpleName()).append("\n");

            sb.append("注解值: ").append(classInfo.value()).append("\n\n");

        }

        sb.append("Field注解：").append("\n");

        Field[] fields = cls.getDeclaredFields();

        for (Field field : fields) {

            FieldInfo fieldInfo = field.getAnnotation(FieldInfo.class);

            if (fieldInfo != null) {

                sb.append(Modifier.toString(field.getModifiers())).append(" ")

                        .append(field.getType().getSimpleName()).append(" ")

                        .append(field.getName()).append("\n");

                sb.append("注解值: ").append(Arrays.toString(fieldInfo.value())).append("\n\n");

            }

        }

        sb.append("Method注解：").append("\n");

        Method[] methods = cls.getDeclaredMethods();

        for (Method method : methods) {

            MethodInfo methodInfo = method.getAnnotation(MethodInfo.class);

            if (methodInfo != null) {

                sb.append(Modifier.toString(method.getModifiers())).append(" ")

                        .append(method.getReturnType().getSimpleName()).append(" ")

                        .append(method.getName()).append("\n");

                sb.append("注解值: ").append("\n");

                sb.append("name: ").append(methodInfo.name()).append("\n");

                sb.append("data: ").append(methodInfo.data()).append("\n");

                sb.append("age: ").append(methodInfo.age()).append("\n");

                Annotation[][] parameterAnnotations = method.getParameterAnnotations();

                for (Annotation[] a : parameterAnnotations

                        ) {

                    if (a != null) {

                        for (Annotation b : a

                                ) {

                            if (AutoUserModel.class.isAssignableFrom(b.annotationType())) {

                                AutoUserModel b1 = (AutoUserModel) b;

                                sb.append("找到了 AutoUserModel =").append(b1.value()).append("\n");

                            }

                            if (AutoPlatformModel.class.isAssignableFrom(b.annotationType())) {

                                AutoPlatformModel b1 = (AutoPlatformModel) b;

                                sb.append("找到了 AutoPlatformModel =").append(b1.value()).append("\n");

                            }

                        }

                    }

                }

            }

        }

        System.out.print(sb.toString());

    }

}