java.io.IOException：grpc 失败

一篇关于"java.io.IOException: grpc 失败"的文章，这个错误通常在使用gRPC进行网络通信时出现。在这篇文章中，我们将探讨这个错误的原因，以及如何解决它。同时，我们将提供一个案例代码来帮助读者更好地理解和解决这个问题。

java
import io.grpc.Server;
import io.grpc.ServerBuilder;
import io.grpc.stub.StreamObserver;
public class GreeterServer {
    private int port = 50051;
    private Server server;
    private void start() throws IOException {
        server = ServerBuilder.forPort(port)
                .addService(new GreeterImpl())
                .build()
                .start();
        System.out.println("Server started, listening on " + port);
        Runtime.getRuntime().addShutdownHook(new Thread(() -> {
            System.err.println("*** shutting down gRPC server since JVM is shutting down");
            GreeterServer.this.stop();
            System.err.println("*** server shut down");
        }));
    }
    private void stop() {
        if (server != null) {
            server.shutdown();
        }
    }
    private void blockUntilShutdown() throws InterruptedException {
        if (server != null) {
            server.awaitTermination();
        }
    }
    public static void main(String[] args) throws IOException, InterruptedException {
        final GreeterServer server = new GreeterServer();
        server.start();
        server.blockUntilShutdown();
    }
    static class GreeterImpl extends GreeterGrpc.GreeterImplBase {
        @Override
        public void sayHello(HelloRequest req, StreamObserver responseObserver) {
            String message = "Hello, " + req.getName();
            HelloReply reply = HelloReply.newBuilder().setMessage(message).build();
            responseObserver.onNext(reply);
            responseObserver.onCompleted();
        }
    }
}

java
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
public class GreeterClient {
    private final ManagedChannel channel;
    private final GreeterGrpc.GreeterBlockingStub blockingStub;
    public GreeterClient(String host, int port) {
        channel = ManagedChannelBuilder.forAddress(host, port)
                .usePlaintext()
                .build();
        blockingStub = GreeterGrpc.newBlockingStub(channel);
    }
    public void shutdown() throws InterruptedException {
        channel.shutdown().awaitTermination(5, TimeUnit.SECONDS);
    }
    public void greet(String name) {
        HelloRequest request = HelloRequest.newBuilder().setName(name).build();
        HelloReply response = blockingStub.sayHello(request);
        System.out.println("Greeting: " + response.getMessage());
    }
    public static void main(String[] args) throws InterruptedException {
        GreeterClient client = new GreeterClient("localhost", 50051);
        try {
            client.greet("Alice");
        } finally {
            client.shutdown();
        }
    }
}