zkclient中的可复用的一些工具类

最新推荐文章于 2022-07-01 16:40:09 发布

最新推荐文章于 2022-07-01 16:40:09 发布 · 310 阅读

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本文详细介绍了org.I0Itec.zkclient.NetworkUtil类中端口检测功能的实现原理，并深入探讨了org.I0Itec.zkclient.serialize.SerializableSerializer类如何通过TcclAwareObjectIputStream实现序列化和反序列化的过程。

1.org.I0Itec.zkclient.NetworkUtil，提供获取本机名称，端口是否被占用等功能，其中判断端口是否被占用的代码：

public static boolean isPortFree(int port) {
        try {
            Socket socket = new Socket("localhost", port);
            socket.close();
            return false;
        } catch (ConnectException e) {
            return true;
        } catch (SocketException e) {
            if (e.getMessage().equals("Connection reset by peer")) {
                return true;
            }
            throw new RuntimeException(e);
        } catch (UnknownHostException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

2.org.I0Itec.zkclient.serialize.SerializableSerializer,实现ZkSerializer，与TcclAwareObjectIputStream配合，提供java原生的序列化和反序列化的方法，其中TcclAwareObjectIputStream重写了基类ObjectInputStream的resolveClass和resolveProxyClass方法。基类的resolveClass使用的是class.forname,TcclAwareObjectIputStream使用的是
Thread.currentThread().getContextClassLoader();两者的区别可以看一下： http://waryist.iteye.com/blog/131983， http://impzx.com/thread-currentthread-getcontextclassloader%EF%BC%88%EF%BC%89%E8%A7%A3%E6%9E%90/

zkclient实现序列换的源码如下：

   @Override
    public Object deserialize(byte[] bytes) throws ZkMarshallingError {
        try {
            ObjectInputStream inputStream = new TcclAwareObjectIputStream(new ByteArrayInputStream(bytes));
            Object object = inputStream.readObject();
            return object;
        } catch (ClassNotFoundException e) {
            throw new ZkMarshallingError("Unable to find object class.", e);
        } catch (IOException e) {
            throw new ZkMarshallingError(e);
        }
    }

    @Override
    public byte[] serialize(Object serializable) throws ZkMarshallingError {
        try {
            ByteArrayOutputStream byteArrayOS = new ByteArrayOutputStream();
            ObjectOutputStream stream = new ObjectOutputStream(byteArrayOS);
            stream.writeObject(serializable);
            stream.close();
            return byteArrayOS.toByteArray();
        } catch (IOException e) {
            throw new ZkMarshallingError(e);
        }
    }