java flink 发送rabbitMq

要在Flink中发送消息到RabbitMQ，你需要使用RabbitMQ的Java客户端库和Flink的SinkFunction。以下是一个简单的例子：

首先，你需要添加RabbitMQ的Java客户端库的依赖。在 Maven 项目中，可以在 pom.xml 文件中添加以下依赖：

<dependencies>
    <dependency>
        <groupId>com.rabbitmq</groupId>
        <artifactId>amqp-client</artifactId>
        <version>5.11.0</version>
    </dependency>
</dependencies>

然后，你需要创建一个实现 SinkFunction 接口的类，用于将消息发送到 RabbitMQ。下面是一个简单的示例：

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;

public class RabbitMqSink extends RichSinkFunction<String> {

    private transient Connection connection;
    private transient Channel channel;
    private String queueName;

    public RabbitMqSink(String queueName) {
        this.queueName = queueName;
    }

    @Override
    public void open(Configuration parameters) throws Exception {
        super.open(parameters);

        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost"); // RabbitMQ 服务器地址
        factory.setUsername("guest"); // RabbitMQ 用户名
        factory.setPassword("guest"); // RabbitMQ 密码

        connection = factory.newConnection();
        channel = connection.createChannel();

        channel.queueDeclare(queueName, false, false, false, null);
    }

    @Override
    public void invoke(String value, Context context) throws Exception {
        channel.basicPublish("", queueName, null, value.getBytes());
    }

    @Override
    public void close() throws Exception {
        super.close();

        if (channel != null) {
            channel.close();
        }

        if (connection != null) {
            connection.close();
        }
    }
}

最后，你可以将该 SinkFunction 应用到 Flink 的数据流中。例如：

import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

public class Main {

    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        
        // 创建一个数据流
        DataStream<String> stream = env.fromElements("message 1", "message 2", "message 3");

        // 将数据发送到 RabbitMQ
        stream.addSink(new RabbitMqSink("my_queue"));

        env.execute("RabbitMQ Example");
    }
}

这样，你就可以将数据流中的消息发送到 RabbitMQ 的 "my_queue" 队列中了。请确保 RabbitMQ 服务器已启动并且可访问