CGlib动态代理

1.接口

public interface UserService {
    JSONObject getUser();
}

实现

public class UserServiceImpl implements UserService {
    @Override
    public JSONObject getUser() {
        JSONObject object = new JSONObject();
        object.put("name", "meikb");
        return object;
    }
}

2.代理类

public class CglibProxy implements MethodInterceptor {
    private Object object;
    public CglibProxy(Object object){
        this.object = object;
    }
    @Override
    public Object intercept(Object o, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
        System.out.println(method.getName() + "方法被调用");
        Object result = method.invoke(object, args);
        System.out.println( "结果" + result.toString());
        System.out.println(method.getName() + "调用完成");
        return result;
    }
    public Object getCglibProxy(){
        return new Enhancer().create(object.getClass(), this);
    }
}

参数当然可以传入接口，参考JDK动态代理。

3.使用

public class UserMain {
    public static void main(String[] args) {
        CglibProxy cglibProxy = new CglibProxy(new UserServiceImpl());
        UserService proxy = (UserService)cglibProxy.getCglibProxy();
        proxy.getUser();
    }
}

4.原理

调用 Enhancer.createHelper 类

private Object createHelper() {
    this.validate();
    if (this.superclass != null) {
        this.setNamePrefix(this.superclass.getName());
    } else if (this.interfaces != null) {
        this.setNamePrefix(this.interfaces[ReflectUtils.findPackageProtected(this.interfaces)].getName());
    }
    return super.create(KEY_FACTORY.newInstance(this.superclass != null ? this.superclass.getName() : null, ReflectUtils.getNames(this.interfaces), this.filter, this.callbackTypes, this.useFactory, this.interceptDuringConstruction, this.serialVersionUID));
}

TODO Enhancer