1.编译器protoc, 下载地址:https://github.com/protocolbuffers/protobuf/releases  (下载对应的版本, 解压后放到go的bin中)

2.安装golang扩展, go get -u github.com/golang/protobuf/protoc-gen-go

3.grpc库, git clone https://github.com/grpc/grpc-go.git $GOPATH/src/google.golang.org/gprc

4.编写DIL文件

syntax = "proto3"; package helloworld; // The greeting service definition. service Greeter {
    // Sends a greeting   rpc SayHello (HelloRequest) returns (HelloReply) {} } // The request message containing the user's name. message HelloRequest {
    string name = 1; } // The response message containing the greetings message HelloReply {
    string message = 1; } 5.生成文件, 在IDL文件目录执行: protoc --go_out=plugins=grpc:. ./hello.proto 6.服务端代码:

package main import (    "fmt"    "golang.org/x/net/context"    "google.golang.org/grpc"    "net"    pb "IDL文件生成的hello.pb.go" ) type service struct{} //声明一个结构体, 实现服务 func (s *service) SayHello(ctx context.Context, req *pb.HelloRequest) (*pb.HelloReply, error) { //服务逻辑, 出入参要和hello.pd.go中的方法一样    name := req.Name //请求结构体中的数据    fmt.Println("this is golang service, request...", name)    return &pb.HelloReply{
        Message: "this is golang service", //返回数据    }, nil } func main() {
     lis, err := net.Listen("tcp", ":50001")    if err != nil {
        panic(err)    }    s := grpc.NewServer()    pb.RegisterGreeterServer(s, &service{}) //注册    _ = s.Serve(lis) }

7.客户端代码

package main import (    "fmt"    "golang.org/x/net/context"    "google.golang.org/grpc"    "hello.pb.go" ) func main() {
     conn, err := grpc.Dial("localhost:50001", grpc.WithInsecure()) //连接    if err != nil {
        fmt.Println(err)    }    defer conn.Close()    hc := helloworld.NewGreeterClient(conn)    res, err := hc.SayHello(context.Background(), &helloworld.HelloRequest{
        Name: "this is golang client request",    })    if err != nil {
        fmt.Println(err)    }    fmt.Println("this is golang client, response...", res.Message) } java与go的客户端和服务端代码都完成了, 并且可以跨语言调用

跨语言通信需要注意, IDL一定要一致, IDL中的package定义也一定要一致, 是grpc服务名的一部分