Exception in thread "main" java.net.ConnectException: Connection timed out: connect

今天，我在学习RabbitMQ时，运行代码报错了！！

简单生产者代码：
package com.xiaoli.producer;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

/**
 * @author 小李Code 
 * RabbitMQ 发送消息
 */
public class Producer_HelloWorld {
    public static void main(String[] args) throws IOException, TimeoutException {
        //1. 创建链接工厂
        ConnectionFactory factory = new ConnectionFactory();
        //2. 设置参数
        factory.setHost("123.60.156.74"); //ip 默认值: localhost
        factory.setPort(5672); //端口 默认值: 5672
        factory.setVirtualHost("/"); //虚拟机 默认值: /
        factory.setUsername("guest"); //用户名 默认值: guest
        factory.setPassword("guest"); //密码 默认值: guest
        //3. 创建链接 Connection
        Connection connection = factory.newConnection();
        //4. 创建 Channel
        Channel channel = connection.createChannel();
        //5. 创建队列 Queue
        /**
         * queueDeclare(String queue, boolean durable, boolean exclusive, boolean autoDelete, Map<String, Object> arguments)
         * 1.queue: 队列名称。
         * 2.durable: 是否持久化，当rabbitmq重启之后，还在。
         * 3.exclusive:
         *      * 是否独占，只能有一个消费者监听队列。
         *      * 当Connection关闭时，是否删除队列。
         * 4.autoDelete: 是否自动删除，当没有Consumer时，自动删除。
         * 5.arguments: 参数。
         */
        // 如果没有一个名字叫hello_world的队列，则会创建该队列，如果有则不会创建
        channel.queueDeclare("hello_world", true, false, false, null);
        //6. 发送消息
        /**
         * basicPublish(String exchange, String routingKey, AMQP.BasicProperties props, byte[] body)
         * 1.exchange：交换机名称。简单模式下交换机会使用默认的 “”
         * 2.routingKey：路由名称
         * 3.props：配置信息
         * 4.body：发送消息数据
         */
        String body = "hello rabbitmq~~~";
        channel.basicPublish("", "hello_world", null, body.getBytes());
        //7. 释放资源
        channel.close();
        connection.close();
    }
}
RabbitMQ管理控制台：

img

运行结果及详细报错内容：
"C:\Program Files\Java\jdk1.8.0_351\bin\java.exe" "-javaagent:D:\AppSourceFile\IntelliJ IDEA 2022.3.2\lib\idea_rt.jar=61186:D:\AppSourceFile\IntelliJ IDEA 2022.3.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_351\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_351\jre\lib\rt.jar;D:\java-codebase\advanced05\task\rabbitmq\rabbitmq-producer\target\classes;D:\apache-maven-repository\com\rabbitmq\amqp-client\5.13.1\amqp-client-5.13.1.jar;D:\apache-maven-repository\org\slf4j\slf4j-api\1.7.31\slf4j-api-1.7.31.jar" com.xiaoli.producer.Producer_HelloWorld
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:81)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:476)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:218)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:200)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:162)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:394)
    at java.net.Socket.connect(Socket.java:606)
    at com.rabbitmq.client.impl.SocketFrameHandlerFactory.create(SocketFrameHandlerFactory.java:60)
    at com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory.newConnection(RecoveryAwareAMQConnectionFactory.java:63)
    at com.rabbitmq.client.impl.recovery.AutorecoveringConnection.init(AutorecoveringConnection.java:160)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1216)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1173)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1131)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1294)
    at com.xiaoli.producer.Producer_HelloWorld.main(Producer_HelloWorld.java:26)

进程已结束,退出代码1
线程“main”异常:连接超时，如何解决这个问题？

你看看mq是否启动了，telnet测试一下

连接不上MQ服务器,可以检查一下防火墙,把MQ端口加到防火墙里面.

检查下你的rabbitmq默认端口是否改过，服务器的防火墙规则是否放行了rabbit的端口。
webui能访问到，说明webui的端口是放行了的

你是docker中启动的吗

factory.setPort(5672); 端口要改为你docker启动是映射的端口信息