我在编写一个JAX-RS网络服务。它通过响应客户端调用来运行：
2）服务器不公开网络服务接口（即没有WSDL接口或REST API）。相反，它使用TCP/IP上的自定义协议。我想要从我的JAX-RS资源 直接向此服务器进行客户端调用，但我不想为每个调用我的JAX-RS资源而打开连接，验证并关闭连接。有没有方法解决这个问题？换句话说，是否有像“套接字连接池”这样的东西可用于Java EE应用程序？我是否必须使用类似ESB的东西？还是有我忽略的替代方案？
这样做的“正确”方式是为您的外部服务器编写一个JCA连接器。 JCA是Java EE堆栈的一部分，其意义正是如此：从应用服务器到外部系统提供入站和出站连接。它支持连接池，身份验证，事务等（顺便提一下，数据库和JMS代理通过JCA连接器访问）。
然而编写这样的适配器可能相当困难。或许可以研究一下轻量级的方法，使用一个通用的连接池库（例如commons-pool或c3p0），也许会更容易些。
也可以看看关于TCP连接池的这个回答。
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