获取所有注解

获取所有注解

obj.getClass().getMethod("myMetch", String.class, int.class).getAnnotations()

package net.jeesite.java;

import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Method;

@Retention(value = RetentionPolicy.RUNTIME)
@interface Meta {

    String length();

    String name();

    int age();

}

@Retention(value = RetentionPolicy.RUNTIME)
@interface MeTe {

    String length();

    String name();

    int age();

}

public class MetaTest {

    @Meta(age = 0, length = "2", name = "测试注解")
    public static void myMetch() throws NoSuchMethodException, SecurityException {
        MetaTest obj = new MetaTest();

        Class<?> c = obj.getClass();

        System.out.println("c:" + c.getConstructors().length);

        Method m = c.getMethod("myMetch");
        System.out.println("m:" + m.getName());
        Meta meta = m.getAnnotation(Meta.class);

        System.out.println("meta.length():" + meta.length());
        System.out.println("meta.name():" + meta.name());
        System.out.println("meta.age():" + meta.age());

    }

    @Meta(age = 30, length = "80", name = "测试带参数方法注解")
    @MeTe(age = 30, length = "80", name = "测试带参数方法注解")
    public static void myMetch(String name, int age) throws NoSuchMethodException, SecurityException {
        MetaTest obj = new MetaTest();

        Class<?> c = obj.getClass();

        System.out.println("c:" + c.getConstructors().length);

        Method m = c.getMethod("myMetch", String.class, int.class);
        System.out.println("m:" + m.getName());
        Meta meta = m.getAnnotation(Meta.class);

        System.out.println("meta.length():" + meta.length());
        System.out.println("meta.name():" + meta.name());
        System.out.println("meta.age():" + meta.age());
        Annotation[] a = obj.getClass().getMethod("myMetch", String.class, int.class).getAnnotations();
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i].getClass().getName());
            System.out.println(a[i]);
        }

    }

    public static void main(String[] args) {

        try {
            myMetch("小熊", 31);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        }
    }

}

运行结果：

c:1
m:myMetch
meta.length():80
meta.name():测试带参数方法注解
meta.age():30
net.jeesite.java.$Proxy1
@net.jeesite.java.Meta(age=30, length=80, name=测试带参数方法注解)
net.jeesite.java.$Proxy2
@net.jeesite.java.MeTe(age=30, length=80, name=测试带参数方法注解)