Java反射工具包reflectasm

╰+攻爆jí腚メ 2022-12-05 10:29 194阅读 0赞

1、

<dependency>
                <groupId>com.esotericsoftware</groupId>
                <artifactId>reflectasm</artifactId>
                <version>1.11.9</version>
            </dependency>

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<Person> 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);
        }
    
    }