java - socket客户端连接问题？

问题描述

问 题

• 项目使用的是Spring-boot

• 服务器使用的是Centos7，项目部署在Docker中

问题：现在我在项目中使用了socket，设置端口号8089，现在客户端无法连接上

/root$ netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      2400/master         
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      5459/sshd           
tcp6       0      0 ::1:25                  :::*                    LISTEN      2400/master         
tcp6       0      0 :::3306                 :::*                    LISTEN      1709/docker-proxy   
tcp6       0      0 :::6379                 :::*                    LISTEN      1587/docker-proxy   
tcp6       0      0 :::8080                 :::*                    LISTEN      23461/docker-proxy  
tcp6       0      0 :::80                   :::*                    LISTEN      15808/docker-proxy  
tcp6       0      0 :::22                   :::*                    LISTEN      5459/sshd 

按照网上的做法开启端口号：

/root$ firewall-cmd --zone=public --add-port=8089/tcp --permanent
success
/root$ firewall-cmd --reload
success

还是不能连接，请问是什么原因？

---

端口已经打开了，并且docker中做了端口映射，但是客户端还是无法连接...??

/$ netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1411/sshd           
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      2351/master         
tcp6       0      0 :::3306                 :::*                    LISTEN      11457/docker-proxy  
tcp6       0      0 :::6379                 :::*                    LISTEN      11680/docker-proxy  
tcp6       0      0 :::8080                 :::*                    LISTEN      14386/docker-proxy  
tcp6       0      0 :::80                   :::*                    LISTEN      11748/docker-proxy  
tcp6       0      0 :::22                   :::*                    LISTEN      1411/sshd           
tcp6       0      0 :::8089                 :::*                    LISTEN      14377/docker-proxy  
tcp6       0      0 ::1:25                  :::*                    LISTEN      2351/master

0.0.0.0:8080->8080/tcp, 0.0.0.0:8089->8089/tcp

Exception in thread "main" java.net.ConnectException: Connection timed out: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at java.net.Socket.<init>(Socket.java:434)
    at java.net.Socket.<init>(Socket.java:211)
    at socketTest.Test.main(Test.java:15)

解决方案

经过检查，是防火墙的问题！

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