protobuf + grpc 使用入门二

最新推荐文章于 2025-07-07 15:47:49 发布

dabaoge_

最新推荐文章于 2025-07-07 15:47:49 发布

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分类专栏： proto+grpc 文章标签： java grpc protobuf

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本文详细讲解如何在Eclipse中使用protobuf和gRPC进行开发，通过proto文件生成的相关类，包括Greeter服务、HelloRequest和HelloReply消息类型，以及客户端和服务器端的实现。最终展示了一个完整的Windows下gRPC Java demo，包括运行成功和客户端关闭连接导致的错误情况。

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今天主要介绍的是在eclipse中运用 protobuf + grpc 使用入门一中的新生成的类来完成我们的grpc + java 的小 demo.网上有着大量示例。但我想介绍的各个类由proto文件的生成关系。
总共生成了七个文件

option java_outer_classname = “HelloWorldProto”; ————》HelloWorldProto (生成的message类中会用到,具体之后再发表)
service Greeter ————》 Greeter,GreeterGrpc

message HelloRequest ————》HelloRequest,HelloRequestOrBuilder(HelloRequest implements HelloRequestOrBuilder)

message HelloReply ————》HelloReply,HelloReplyOrBuilder(HelloReply implements HelloReplyOrBuilder)
Server

public class HelloServer {


    private int port = 50051;
    private Server server;

    private void start() throws IOException {
        server = ServerBuilder.forPort(port)
                .addService(new GreeterImpl())
                .build()
                .start();

        System.out.println("service start...");

        Runtime.getRuntime().addShutdownHook(new Thread() {

            @Override
            public void run() {

                System.err.println("*** shutting down gRPC server since JVM is shutting down");
                HelloServer.this.stop();
                System.err.println("*** server shut down");
            }
        });
    }

    private void stop() {
        if (server != null) {
            server.shutdown();
        }
    }

    // block 一直到退出程序 
    private void blockUntilShutdown() throws InterruptedException {
        if (server != null) {
            server.awaitTermination();
        }
    }


    public static void main(String[] args) throws IOException, InterruptedException {

        final HelloServer server = new HelloServer();
        server.start();
        server.blockUntilShutdown();
    }


    // 实现 定义一个实现服务接口的类 
    private class GreeterImpl extends GreeterGrpc.GreeterImplBase {


        public void sayHello(HelloRequest req, StreamObserver<HelloReply> responseObserver) {
            System.out.println("service:"+req.getName());
            HelloReply reply = HelloReply.newBuilder().setMessage(("Hello: " + req.getName())).build();
            responseObserver.onNext(reply);
            responseObserver.onCompleted();
        }
    }
}

Client

public class HelloClient {

    private final ManagedChannel channel; 
    private final GreeterGrpc.GreeterBlockingStub blockingStub; 


    public HelloClient(String host,int port){ 
        channel = ManagedChannelBuilder.forAddress(host,port) 
                .usePlaintext(true) 
                .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(response.getMessage());

    }

    public static void main(String[] args) throws InterruptedException { 
        HelloClient client = new HelloClient("127.0.0.1",50051);
        for(int i=0;i<5;i++){
            client.greet("world:"+i);
        }


    }