Java Socket异常

Question

我正在尝试用Java编写一个简单的客户端服务器程序： - 在同一台机器上运行服务器和客户端代码......但在运行时遇到错误： -

java.net.ConnectException: Connection refused: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(Unknown Source)
        at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.SocksSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.(Unknown Source)
        at java.net.Socket.(Unknown Source)
        at Requester.run(Requester.java:13)
        at Requester.main(Requester.java:68)
Exception in thread "main" java.lang.NullPointerException
        at Requester.run(Requester.java:45)
        at Requester.main(Requester.java:68)

任何人都可以帮忙！

Answer 1

您尝试连接的端口是否已打开？是否存在可能阻止请求的活动防火墙？