JAVA使用反射读取注解方式

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface MethodInfo {
    String author() default "unknown";
    String date();
    int version() default 1;
}

public class ReflectionTest {
    @MethodInfo(author = "John Doe", date = "2022-01-01", version = 2)
    public void printMessage() {
        System.out.println("Hello, World!");
    }
}

import java.lang.reflect.Method;
public class AnnotationReader {
    public static void readAnnotations() {
        try {
            // 获取ReflectionTest类的Class对象
            Class<?> clazz = Class.forName("ReflectionTest");
            // 获取所有方法
            Method[] methods = clazz.getDeclaredMethods();
            // 遍历方法，查找MethodInfo注解
            for (Method method : methods) {
                if (method.isAnnotationPresent(MethodInfo.class)) {
                    MethodInfo methodInfo = method.getAnnotation(MethodInfo.class);
                    // 输出注解信息
                    System.out.println("Method Name: " + method.getName());
                    System.out.println("Author: " + methodInfo.author());
                    System.out.println("Date: " + methodInfo.date());
                    System.out.println("Version: " + methodInfo.version());
                    System.out.println("----------------------");
                }
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

public class Main {
    public static void main(String[] args) {
        AnnotationReader.readAnnotations();
    }
}