使用工具

idea + gradle

项目构建

创建空的父项目

注意此处使用gradle进行项目构建， 选择war，选择gradle，此处我们创建多模块项目，所以父项目并不需要src等目录，因为是笔者刚开始使用gradle，所以几乎每一步都是小心翼翼

此时完成了一个空项目，里面具有两个文件， settings.gradle和build.gradle

配置子项目的仓库地址， 在build.gradle中添加如下代码

subprojects {    repositories {        maven {            url "https://maven.aliyun.com/repository/central"        }    }}

创建lib子项目

上一篇文章我基于gradle构建了一个java项目并且根据proto生成了java文件，此处需要引用上篇中生成的文件
新建grpc-lib子项目

同理创建grpc-server和grpc-client，都是springboot-web项目，项目建成以后的目录如下图：

项目结构搭建完成，接下来完成基于springboot的grpc实现

1：springboot-grpc-demo/settings.gradle中配置，完成整合，表示这三个Module是属于同一个项目

rootProject.name = 'sprignboot-grpc-demo'include 'grpc-lib',"grpc-server","grpc-client"

2：springboot-grpc-demo/build.gradle中为子项目做一些配置，此处指定maven仓库，也可以选择不指定

group 'com.example'version '1.0-SNAPSHOT'subprojects {    repositories {        mavenLocal()        maven {            url "https://maven.aliyun.com/repository/central"        }        mavenCentral()    }}

3：grpc-lib中引入所需依赖

plugins {    id 'java'}group 'com.example.springboot-grpc-demo'version '1.0-SNAPSHOT'archivesBaseName="grpc-lib"sourceCompatibility = 1.8// 引入依赖dependencies {    compile "io.grpc:grpc-netty:1.10.0"    compile "io.grpc:grpc-protobuf:1.10.0"    compile "io.grpc:grpc-stub:1.10.0"}

4：配置grpc-server的项目依赖等(grpc-server/build.gradle)

  buildscript {    ext {        springBootVersion = '2.0.5.RELEASE'    }    repositories {        mavenLocal()        maven{            url "https://maven.aliyun.com/repository/central"        }        mavenCentral()    }    dependencies {        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")    }}apply plugin: 'java'apply plugin: 'idea'apply plugin: 'org.springframework.boot'apply plugin: 'io.spring.dependency-management'apply plugin: 'war'group 'com.example.springboot-grpc-demo'version = '0.0.1-SNAPSHOT'sourceCompatibility = 1.8archivesBaseName="grpc-server"repositories {    mavenLocal()    maven{        url "https://maven.aliyun.com/repository/central"    }    mavenCentral()}configurations {    providedRuntime}dependencies {    //引入grpc-lib模块    compile project(":grpc-lib")    //引入grpc-server所需依赖，springboot集成的    compile 'net.devh:grpc-server-spring-boot-starter:1.4.0.RELEASE'    compile('org.springframework.boot:spring-boot-starter-web')    providedRuntime('org.springframework.boot:spring-boot-starter-tomcat')}

5：grpc-client配置（grpc-client/build.gradle）

buildscript {    ext {        springBootVersion = '2.0.5.RELEASE'    }    repositories {        mavenLocal()        maven{            url "https://maven.aliyun.com/repository/central"        }        mavenCentral()    }    dependencies {        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")    }}apply plugin: 'java'apply plugin: "idea"apply plugin: 'org.springframework.boot'apply plugin: 'io.spring.dependency-management'apply plugin: 'war'group 'com.example.springboot-grpc-demo'version = '0.0.1-SNAPSHOT'sourceCompatibility = 1.8archivesBaseName="grpc-client"configurations {    providedRuntime}repositories {    mavenLocal()    maven{        url "https://maven.aliyun.com/repository/central"    }    mavenCentral()}dependencies {    // 引入grpc-lib    compile project(":grpc-lib")    // 此处和上面server配置中不一样哦    compile 'net.devh:grpc-client-spring-boot-starter:1.4.0.RELEASE'    compile('org.springframework.boot:spring-boot-starter-web')    providedRuntime('org.springframework.boot:spring-boot-starter-tomcat')}

项目搭建及配置完成，终于要开始写代码了，吼吼

grpc实现

1：按照上篇文章中的内容，命令行输入 gradle compileJava完成对hello.proto的编译

2：编写grpc-server，新建service/HelloService.java (interface) 、service/impl/HelloServiceImpl.java
HelloServiceImpl代码

@GrpcService(HelloServiceGrpc.class)public class HelloServiceImpl extends HelloServiceGrpc.HelloServiceImplBase implements HelloService {    private static final Logger LOG = LoggerFactory.getLogger(HelloServiceImpl.class);    @Override    public void sayHello(HelloRequest request, StreamObserver<HelloResponse> responseObserver) {        String name = request.getName();        LOG.info("received client name is " + name);        HelloResponse response = HelloResponse.newBuilder().setCode("0000").setMessage("hello "+ name).build();        responseObserver.onNext(response);        responseObserver.onCompleted();    }}

3：编写grpc-client，新建service/HelloService.java (interface) 、service/impl/HelloServiceImpl.java 、controller\HelloController
因为client也需要提供接口给前端访问，所以就需要controller
(1)HelloService.java代码

public interface HelloService {    //此处没有深入做封装，简单演示    Map getGreeting (String name);}

（2）HelloServiceImpl代码

//方便大家观察，把导入的包也放上来import com.example.grpcclient.service.HelloService;import com.geek.grpc.lib.hello.HelloRequest;import com.geek.grpc.lib.hello.HelloResponse;import com.geek.grpc.lib.hello.HelloServiceGrpc;import io.grpc.Channel;@Servicepublic class HelloServiceImpl extends HelloServiceGrpc.HelloServiceImplBase implements HelloService {    @GrpcClient("grpc_local_server")    private Channel channel;    @Override    public Map getGreeting(String name) {        HelloServiceGrpc.HelloServiceBlockingStub blockingStub = HelloServiceGrpc.newBlockingStub(channel);        HelloResponse response = blockingStub.sayHello(HelloRequest.newBuilder().setName(name).build());        Map map = new HashMap();        map.put("code", response.getCode());        map.put("msg", response.getMessage());        return map;    }}

（3）HelloController代码

@RestControllerpublic class HelloController {    @Autowired    private HelloService helloService;    @GetMapping("/hello")    public Map sayHello(String name){        return helloService.sayHello(name);    }}

完成以上步骤，代码编写完成，本文不做代码详细释义，具体参考官网API文档

项目启动和准备调用配置

grpc-server/src/main/resources/application.properties(熟悉springboot的猿和媛就可以用自己的配置了)

server.port=8081spring.application.name=grpc-local-servergrpc.server.port=9898

grpc-client/src/main/resources/application.properties

server.port=8082spring.application.name=grpc-local-clientgrpc.client.grpc_local_server.host=127.0.0.1grpc.client.grpc_local_server.port=9898grpc.client.grpc_local_server.enableKeepAlive=truegrpc.client.grpc_local_server.keepAliveWithoutCalls=true

启动调用

启动grpc-client和grpc-server，然后浏览器中访问http://localhost:8082/hello?name=World

同时，我们查看grpc-server控制台

码云地址：https://gitee.com/devilscode/grpc-boot-simple

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