The code is as follows:

        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("192.168.2.135");
        connectionFactory.setPort(5672);
        connectionFactory.setUsername("admin");
        connectionFactory.setPassword("admin");
        connectionFactory.setVirtualHost("/");

        Connection connection=null;
        Channel channel = null;

        try {
            //2.create linke Connection
            connection = connectionFactory.newConnection("Creator");

Error: Java. Net. Connectexception: connection timed out: connect

Cause analysis: first, the IP port account and password are excluded

Error reason: port 5672 is not open. I always thought that everything would be fine as long as the protective wall was closed

Solution:

1. Restart the firewall: systemctl start firewall

2. Open 5672 port: firewall CMD — zone = public — add port = 5672/TCP — permanent

3. Reload: firewall CMD — reload

Run debug:

success!!!