Java反射工具包reflectasm

1、

            com.esotericsoftware
            reflectasm
            1.11.9
        

1、实体类

package com.redisson;

/**
 * @Description TODO
 * @Date 2020/7/28 13:41
 * @Author zsj
 */
public class Person {
    public int age;
    public String name;

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String say(int age, String name) {
        return "hh+" + age + "---" + name;
    }
}

2、测试类

package com.redisson;

import com.esotericsoftware.reflectasm.ConstructorAccess;
import com.esotericsoftware.reflectasm.FieldAccess;
import com.esotericsoftware.reflectasm.MethodAccess;

/**
 * @Description TODO
 * @Date 2020/9/10 9:15
 * @Author zsj
 */
public class ReflectasmTest {

    public static void main(String[] args) {
//        testReflectAsm4Name();

//        testReflectAsm4Index();

//        testFieldAccess();

//        testConstructorAccess();

        testIndex();
    }


    /**
     * ReflectAsm反射调用方法
     * 用名称定位反射方法
     */
    public static void testReflectAsm4Name() {
        Person target = new Person();
        MethodAccess access = MethodAccess.get(Person.class);//生成字节码的方式创建UserServiceMethodAccess
        long start = System.currentTimeMillis();
        for (int i = 0; i < 100000000; i++) {
            Object object = access.invoke(target, "say", i, i + "hhhll");
//            System.out.println(object);

        }
        long end = System.currentTimeMillis();
        System.out.println("timeout=" + (end - start));//523 382 415 489 482
    }

    /**
     * ReflectAsm反射调用方法
     * 用方法和字段的索引定位反射方法，性能高
     */
    public static void testReflectAsm4Index() {
        Person target = new Person();
        MethodAccess access = MethodAccess.get(Person.class);
        int index = access.getIndex("say", int.class, String.class);
        long start = System.currentTimeMillis();
        for (int i = 0; i < 100000000; i++) {
            access.invoke(target, index, 1, "zhangsan");
        }
        long end = System.currentTimeMillis();
        System.out.println("timeout=" + (end - start));//12 15 23 14 24
    }

    /**
     * ReflectAsm反射来set/get字段值
     */

    public static void testFieldAccess() {
        Person target = new Person();
        FieldAccess fieldAccess = FieldAccess.get(target.getClass());

        long start = System.currentTimeMillis();
        for (int i = 0; i < 100000000; i++) {
            fieldAccess.set(target, "age", 100);
        }
        long end = System.currentTimeMillis();
        System.out.println("timeout=" + (end - start));
        int state = (Integer) fieldAccess.get(target, "age");
        System.out.println(state);

    }

    /**
     * ReflectAsm反射来调用构造方法
     */

    public static void testConstructorAccess() {
        ConstructorAccess constructorAccess = ConstructorAccess.get(Person.class);
        Person person = constructorAccess.newInstance();
        System.out.println(person);
    }

    /**
     * 查找方法的索引
     */

    public static void testIndex() {
        Person target = new Person();
        MethodAccess methodAccess = MethodAccess.get(target.getClass());
        int index = methodAccess.getIndex("say", int.class, String.class);
        System.out.println(index);
    }

}