cglib生成代理对象为null？

• Z时代
• 2024-03-12
• 分类：IT

向createProxy和getProxy这两个方法传了个接口类型的类，为什么生成代理对象为null呢【吐血】大佬们救救

public class ObjectProxy implements MethodInterceptor {
    private static Logger log = LoggerFactory.getLogger(ObjectProxy.class);
    private static final Map<Class<?>, Object> PROXY_MAP = new ConcurrentHashMap<>();
    private final Client client;
    private final String serviceName;
    private final String interfaceName;
    private static final AtomicInteger RPC_ID = new AtomicInteger(10000);
    private ObjectMapper objectMapper = new ObjectMapper();
    public ObjectProxy(Client client, String serviceName, String interfaceName) {
        this.client = client;
        this.serviceName = serviceName;
        this.interfaceName = interfaceName;
    }
    public Object createProxy(Class<?> clazz) {
        //创建动态代理增强类
        Enhancer enhancer = new Enhancer();
        //设置类加载器
        enhancer.setClassLoader(clazz.getClassLoader());
        //设置被代理类
        enhancer.setSuperclass(clazz);
        //拦截触发回调执行intercept
        enhancer.setCallback(this);
        return enhancer.create();
    }
    @SuppressWarnings("unchecked")
    public <T> T getProxy(Class<T> clazz) {
        try {
            T proxy = (T) PROXY_MAP.computeIfAbsent(clazz, (this::createProxy));
            if (proxy == null) {
                log.error("Failed to create proxy for class {}", clazz.getName());
            }
            return proxy;
        } catch (Exception e) {
            log.error("Error creating proxy for class {}", clazz.getName(), e);
        }
        return null;
    }
    @Override
    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
        Object[] params = new Object[objects.length];
        for (int i = 0; i < objects.length; i++) {
            params[i] = objectMapper.writeValueAsString(objects[i]);
        }
        //TODO Client发送请求
        RpcRequest rpcRequest = new RpcRequest();
        rpcRequest.setMethodName(method.getName());
        rpcRequest.setServiceName(serviceName);
        rpcRequest.setInterfaceName(interfaceName);
        rpcRequest.setParameterTypes(method.getParameterTypes());
        rpcRequest.setParameterValues(params);
        rpcRequest.setRpcId(RPC_ID.getAndIncrement());
        return client.sendRequest(rpcRequest);
    }
}

回答：

public class ObjectProxy implements InvocationHandler {
    // ... 其他代码 ...
    public Object createProxy(Class<?> clazz) {
        return Proxy.newProxyInstance(clazz.getClassLoader(), new Class<?>[]{clazz}, this);
    }
    // ... 其他代码 ...
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        // 在此处实现方法拦截逻辑
    }
}

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