Java 连接被拒绝的云amqp

我正在使用cloudamqp消息服务来尝试MQs（在本例中是RabbitMQ）。我试图将一条消息从Java类推送到队列中，但它总是说：

拒绝连接

另外，System.getenv返回null（我也很难接受）

以下是代码和例外情况：

    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，它捕获空指针异常：

    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();

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

这很奇怪,， 您可以将uri设置为常量：

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

或者尝试通过环境变量的名称获取其uri值

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

---

你认为

System.getenv（）

有什么作用？您正在尝试检索名为

amqp://xxuserxx:password_xxxxxxxxxx@Cloudamqhost/vhost

我不认为这是您想要做的。您应该尝试设置一个类似于

CLOUDAMQP\u URL的环境变量=amqp://xxuserxx:password_xxxxxxxxxx@Cloudamqhost/vhost

使用

导出

（在linux中）或

set

（在windows中）我不确定。我只是从cloudamqp教程中复制了这个示例。让我尝试使用uri=”amqp://xxuserxx:password_xxxxxxxxxx@Cloudamqhost/vhost“关于空指针，请确认什么是空的？（连接或工厂）您可以将环境变量设置为@piy26建议并检索该变量，或者直接按照建议设置值。已工作：D谢谢