反射方式读取注解信息

package com.example.simpleframework.annotation;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;


public class AnnotationParse {
    public static void main(String[] args) throws ClassNotFoundException {
        parseTypeAnnotation();
        parseFiledAnnotation();
        parseMethod();
    }

    //解析类的注解
    public static void parseTypeAnnotation() throws ClassNotFoundException {
        Class clazz = Class.forName("com.example.simpleframework.annotation.Course");
        //这里只是获取对象的注解，而不是方法和成员变量的注解
        Annotation[] annotations = clazz.getAnnotations();
        for (Annotation annotation : annotations) {
            CourseInfoAnnotation courseInfoAnnotation = (CourseInfoAnnotation) annotation;
            System.out.println("名字: " + courseInfoAnnotation.courseName());
            System.out.println("标签: " + courseInfoAnnotation.courseTag());
            System.out.println("描述: " + courseInfoAnnotation.courseProfile());
            System.out.println("序号: " + courseInfoAnnotation.courseIndex());
        }
    }

    //解析成员注解
    public static void parseFiledAnnotation() throws ClassNotFoundException {
        Class clazz = Class.forName("com.example.simpleframework.annotation.Course");
        Field[] fields = clazz.getDeclaredFields();
        for (Field field : fields) {
            //判断是指定注解
            boolean b = field.isAnnotationPresent(PersonInfoAnnotation.class);
            if (b) {
                PersonInfoAnnotation personInfoAnnotation = field.getAnnotation(PersonInfoAnnotation.class);
                System.out.println("name=" + personInfoAnnotation.name());
                for (String s : personInfoAnnotation.language()) {
                    System.out.println(s);
                }
            }
        }
    }

    //解析方法注解
    public static void parseMethod() throws ClassNotFoundException {
        Class clazz = Class.forName("com.example.simpleframework.annotation.Course");
        Method[] methods = clazz.getDeclaredMethods();
        for (Method method : methods) {
            boolean b = method.isAnnotationPresent(CourseInfoAnnotation.class);
            if (b) {
                CourseInfoAnnotation annotation = method.getAnnotation(CourseInfoAnnotation.class);
                System.out.println(annotation.courseName());
            }
        }
    }

}