连接被拒绝的云amqp

Question

我正在使用cloudamqp消息服务来试用MQ（在这种情况下为RabbitMQ）。 我正在尝试将消息从Java类推送到Queue中，但是它总是说：

拒绝连接

同样，System.getenv返回null（我也坚持这样做）。

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)

当我捕获通用异常时，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";

奇怪的是，您将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";