将 https://github.com/google/go-genproto 修改文件名放到 $GOPATH/src/google.golang.org/genproto

将 https://github.com/grpc/grpc-go       修改文件名放到 $GOPATH/src/google.golang.org/grpc

将 https://github.com/golang/text        放到 $GOPATH/src/golang.org/x/text

将 https://github.com/golang/net         放到 $GOPATH/src/golang.org/x/net

然后

cd $GOPATH/src/

go install google.golang.org/grpc

package main

import (

	"context"

	"log"

	"net"

	"google.golang.org/grpc"

	pb "google.golang.org/grpc/examples/helloworld/helloworld"

)

const (

	PORT = ":8080"

)

type server struct{}

// SayHello实现了helloworld.pb.go中的GreeterServer接口

func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {

	log.Printf("Received: %v", in.Name)

	return &pb.HelloReply{Message: "Hello " + in.Name}, nil

}

func main() {

	// 监听

	lis, err := net.Listen("tcp", PORT)

	if err != nil {

		log.Fatalf("failed to listen: %v", err)

	}

	// new服务对象

	s := grpc.NewServer()

	// 注册服务

	pb.RegisterGreeterServer(s, &server{})

	if err := s.Serve(lis); err != nil {

		log.Fatalf("failed to serve: %v", err)

	}

}

package main

import (

	"context"

	"log"

	"time"

	"google.golang.org/grpc"

	pb "google.golang.org/grpc/examples/helloworld/helloworld"

)

const (

	ADDR = "localhost:8080"

	NAME = "World"

)

func main() {

	// 建立与服务器的连接

	conn, err := grpc.Dial(ADDR, grpc.WithInsecure())

	if err != nil {

		log.Fatalf("连接失败: %v", err)

	}

	defer conn.Close()

	// 调用proto的函数创建客户端连接句柄

	c := pb.NewGreeterClient(conn)

	ctx, cancel := context.WithTimeout(context.Background(), time.Second)

	defer cancel()

	// 调用proto的SayHello函数

	r, err := c.SayHello(ctx, &pb.HelloRequest{Name: NAME})

	if err != nil {

		log.Fatalf("调用SayHello失败: %v", err)

	}

	log.Println(r.Message)

}