gRPC Java、Go、PHP使用例子

由于篇幅所限，以下是每种语言的gRPC客户端和服务端示例代码。

Java:

// 服务端
public class GreeterService extends GreeterGrpc.GreeterImplBase {
    @Override
    public void sayHello(HelloRequest request, StreamObserver<HelloResponse> responseObserver) {
        HelloResponse response = HelloResponse.newBuilder().setMessage("Hello " + request.getName()).build();
        responseObserver.onNext(response);
        responseObserver.onCompleted();
    }
}
 
// 客户端
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();
        HelloResponse response = blockingStub.sayHello(request);
        System.out.println(response.getMessage());
    }
}

Go:

// 服务端
func (s *server) SayHello(ctx context.Context, req *pb.HelloRequest) (*pb.HelloResponse, error) {
    return &pb.HelloResponse{Message: "Hello " + req.Name}, nil
}
 
// 客户端
func main() {
    conn, err := grpc.Dial("localhost:50051", grpc.WithInsecure(), grpc.WithBlock(), grpc.WithTimeout(time.Second))
    if err != nil {
        log.Fatalf("did not connect: %v", err)
    }
    defer conn.Close()
 
    client := pb.NewGreeterClient(conn)
    response, err := client.SayHello(context.Background(), &pb.HelloRequest{Name: "World"})
    if err != nil {
        log.Fatalf("could not greet: %v", err)
    }
    log.Printf("Greeting: %s", response.Message)
}

PHP:

// 服务端
class GreeterService extends GreeterClient {
    public function SayHello(HelloRequest $request): HelloResponse {
        $response = new HelloResponse();
        $response->setMessage('Hello ' . $request->getName());
        return $response;
    }
}
 
// 客户端
$client = new GreeterClient('localhost:50051', [
    'credentials' => Grpc\ChannelCredentials::createInsecure(),
]);
 
$request = new HelloRequest();
$request->setName("World");
 
$response = $client->SayHello($request);
echo $response->getMessage();