rabbitmq: [AMQP Connection 192.168.31.41:5672] ForgivingExceptionHandler - An unexpected connection

如下是获取与 RabbitMQ 连接的一段代码，示例如下：

/**
 * 获取连接对象
 * @return 连接对象
 */
public static Connection getConnection() throws IOException, TimeoutException {
    // 定义连接工厂
    ConnectionFactory factory = new ConnectionFactory();
    // 设置服务地址
    factory.setHost("192.168.31.41");
    // 设置端口
    factory.setPort(5672);
    // 设置账号信息，用户名，密码和虚拟主机
    factory.setVirtualHost("host1");
    factory.setUsername("shoto");
    factory.setPassword("abc123");
    // 握手超时设置需要有，因为不同机器之前的网络情况不同，因此可能导致网络超时而无法连接
//        factory.setHandshakeTimeout(300 * 1000);
    // 通过工厂获取连接
    Connection connection = factory.newConnection();
    return connection;
}

在用户权限、连接信息、erlang 和 RabbitMQ 版本适配都正确的情况，运行依旧报下述错误：

Exception in thread "main" java.util.concurrent.TimeoutException
	at com.rabbitmq.utility.BlockingCell.get(BlockingCell.java:77)
	at com.rabbitmq.utility.BlockingCell.uninterruptibleGet(BlockingCell.java:120)
	at com.rabbitmq.utility.BlockingValueOrException.uninterruptibleGetValue(BlockingValueOrException.java:36)
	at com.rabbitmq.client.impl.AMQChannel$BlockingRpcContinuation.getReply(AMQChannel.java:451)
	at com.rabbitmq.client.impl.AMQConnection.start(AMQConnection.java:323)
	at com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory.newConnection(RecoveryAwareAMQConnectionFactory.java:63)
	at com.rabbitmq.client.impl.recovery.AutorecoveringConnection.init(AutorecoveringConnection.java:177)
	at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1161)
	at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1118)
	at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1076)
	at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1236)
	at com.shoto.utils.ConnectionUtil.getConnection(ConnectionUtil.java:31)
	at com.shoto.utils.ConnectionUtil.main(ConnectionUtil.java:42)
2021-01-30 20:25:20 761 ERROR [AMQP Connection 192.168.31.41:5672] ForgivingExceptionHandler - An unexpected connection driver error occured - (124)
java.net.SocketException: Socket Closed
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
	at java.net.SocketInputStream.read(SocketInputStream.java:171)
	at java.net.SocketInputStream.read(SocketInputStream.java:141)
	at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
	at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
	at java.io.DataInputStream.readUnsignedByte(DataInputStream.java:288)
	at com.rabbitmq.client.impl.Frame.readFrom(Frame.java:91)
	at com.rabbitmq.client.impl.SocketFrameHandler.readFrame(SocketFrameHandler.java:164)
	at com.rabbitmq.client.impl.AMQConnection$MainLoop.run(AMQConnection.java:604)
	at java.lang.Thread.run(Thread.java:748)

后来才发现是由于网络连接 RabbitMQ 超时导致的，解决办法就是在连接的时候增加如下代码，具体产生问题原因未知：

// 握手超时设置需要有，因为不同机器之前的网络情况不同，因此可能导致网络超时而无法连接
factory.setHandshakeTimeout(300 * 1000);