获取lambda表达式的元信息

A.java

@FunctionalInterface
public interface A<T, R> extends Function<T, R>, Serializable {
}

Appender.java

public class Appender<T> {
    private T t;

    public <R> R append(A<T, R> a) throws ReflectiveOperationException {
        a.apply(this.t);
        Method methods = a.getClass().getDeclaredMethod("writeReplace");
        methods.setAccessible(true);
        SerializedLambda lambda = (SerializedLambda) methods.invoke(a);
        System.out.println("lambdaClassName:" + lambda.getImplClass());
        System.out.println("lambdaMethodName:" + lambda.getImplMethodName());
        return (R) new Object();
    }

    public T getT() {
        return t;
    }

    public Appender setT(T t) {
        this.t = t;
        return this;
    }
}

Entity.java

public class Entity {
    private Integer id;

    public Integer getId() {
        return id;
    }
}

MainTest.java

public class MainTest {
    public static void main(String[] args) throws ReflectiveOperationException {
        Appender<Entity> a = Wrapper.builder()
                .build()
                .wrap(Entity.class);
        a.setT(new Entity());
        a.append(Entity::getId);
    }
}

Wrapper.java

import lombok.Builder;

/**
 * @author Frank
 */
@Builder
public class Wrapper {
    public <T> Appender<T> wrap(Class<T> clazz) throws IllegalAccessException, InstantiationException {
        return new Appender<>();
    }
}