连接被拒绝云amqp

Question

我正在使用 cloudamqp 消息服务来试用 MQ（在本例中为 RabbitMQ）。我正在尝试从 Java class 将消息推送到队列中，但它总是说：

Connection Refused

还有 System.getenv returns null（我也坚持）。

下面是代码和异常：

    String uri = System.getenv("amqp://xxuserxx:password_xxxxxxxxxx@Cloudamqhost/vhost");
        if (uri == null) uri = "amqp://guest:guest@localhost";
    ConnectionFactory factory = new ConnectionFactory();
    try {
        factory.setUri(uri);
    } catch (URISyntaxException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (KeyManagementException e) {
        e.printStackTrace();
    }

    //Recommended settings
    factory.setRequestedHeartbeat(30);
    factory.setConnectionTimeout(60000);

    Connection connection = null;
    try {
        connection = factory.newConnection(); //Getting Null Pointer here
    } catch (TimeoutException e) {
        e.toString();

堆栈跟踪：

Exception in thread "main" java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
    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 com.rabbitmq.client.impl.SocketFrameHandlerFactory.create(SocketFrameHandlerFactory.java:60)
    at com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory.newConnection(RecoveryAwareAMQConnectionFactory.java:62)
    at com.rabbitmq.client.impl.recovery.AutorecoveringConnection.init(AutorecoveringConnection.java:134)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:997)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:956)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:914)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1068)

当我捕获泛型异常时，它正在捕获空指针异常：

java.lang.NullPointerException @connection = factory.newConnection()

Answer 1

String uri = 
System.getenv("amqp://xxuserxx:password_xxxxxxxxxx@Cloudamqhost/vhost");
if (uri == null) uri = "amqp://guest:guest@localhost";

这很奇怪，要么将 uri 设置为常量：

String uri = "amqp://xxuserxx:password_xxxxxxxxxx@Cloudamqhost/vhost";

或者您尝试通过名称获取环境变量的 uri 值

System.getenv("AMQP_CONNECTION_STRING");
if (uri == null) uri = "amqp://guest:guest@localhost";

连接被拒绝云amqp

Connection Refused cloud amqp

java

rabbitmq

queue

amqp

cloudamqp