我有一个案例场景，其中我有一个流生成器客户端，它生成多个流，合并它们并将其发送到socket，我希望flink程序将其作为服务器进行侦听。正如我们所知，必须首先打开服务器，以便它能够侦听客户机请求。我试着用下面给出的代码来做同样的事情

public static void main(String[] args)  throws Exception {

    //setting the envrionment variable as StreamExecutionEnvironment
      StreamExecutionEnvironment environment = StreamExecutionEnvironment.getExecutionEnvironment();

        environment.setParallelism(1);

        DataStream<String> stream1 = environment.socketTextStream("localhost", 9000);
        stream1.print();

                //start the execution
     environment.execute(" Started the execution ");

}// main

流生成器作为客户端的代码如下所示

DataStream<Event> stream1  = envrionment
                .addSource(new EventGenerator(2,60,1,1,100, 200 ))
                .name("stream 1")
                .setParallelism(parallelism_for_stream_rr);

    DataStream<Event> stream2  = envrionment
            .addSource(new EventGenerator(3,60,1,2,10, 20 ))
            .name("stream 2")
            .setParallelism(parallelism_for_stream_rr);

    DataStream<Event> stream3  = envrionment
            .addSource(new EventGenerator(5,60,1,3,30, 40 ))
            .name("stream 3")
            .setParallelism(parallelism_for_stream_rr);

    DataStream<Event> merged = stream1.union(stream2,stream3);

    merged.print();

            // sending data to Mobile Cep via socket

            merged.map(new MapFunction<Event, String>() {

                @Override
                public String map(Event event) throws Exception {
                    String tuple = event.toString();

                    return tuple + "\n";

                }
            }).writeToSocket("localhost", 9000, new SimpleStringSchema() );

问题#1：问题是客户端代码只有在启动netcat服务器时才起作用，但是netcat服务器不会转发数据流。如果netcat服务器没有启动，客户端代码会说它无法建立连接
问题2：如果netcat服务器没有启动，flink程序就不会执行

Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
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.SocksSocketImpl.connect(SocksSocketImpl.java:392)

我知道一个可能的解决方案是在flink程序中生成流，但是我希望通过socket接收流。
提前谢谢~