【JAVA】gRPC使用

安装proto 3.+版本

参照http://blog.csdn.net/simonchi/article/details/76495696

写好proto文件

peroson.proto  对象定义文件

syntax="proto3";package com.cmcc.protobuf;option java_outer_classname="PersonProbuf";message Person {string username=1;int32 age=2;string sex=3;}message Req {string username=1;}message Resp {Person person=1;}

service.proto 服务定义文件

syntax="proto3";package com.cmcc.protobuf;import "person.proto";service UserService {rpc query(Req) returns (Resp) {}}

具体proto文件的语法参照官方https://developers.google.com/protocol-buffers/docs/proto3

然后通过proto生成person和service的代码

protoc -I=$SRC_DIR --java_out=$DST_DIR $SRC_DIR/addressbook.proto

然后执行mvn clean install最后会在target目录下生成服务的rpc的代码，拷贝到src目录下即可

编写服务端代码

package com.cmcc.grpc;import io.grpc.Server;import io.grpc.ServerBuilder;import io.grpc.stub.StreamObserver;import com.cmcc.protobuf.PersonProbuf;import com.cmcc.protobuf.PersonProbuf.Req;import com.cmcc.protobuf.PersonProbuf.Resp;import com.cmcc.protobuf.UserServiceGrpc;/** * @Type GrpcServer.java * @Desc  * @author chiwei * @date 2017年8月2日 下午2:51:12 * @version  *//** * @author chiwei * */public class GrpcServer {    private int port = 50011;    private Server server;    private void start() throws Exception {        server = ServerBuilder.forPort(port).addService(new UserServiceImpl()).build().start();        System.out.println("user service start ...");        Runtime.getRuntime().addShutdownHook(new Thread() {            @Override            public void run() {                // TODO Auto-generated method stub                super.run();                System.out.println("shutting down gRPC server since JVM is shutting down");                GrpcServer.this.stop();                System.out.println("server shut down");            }        });    }    private void stop() {        if (server != null) {            server.shutdown();        }    }    private void blockUntilShutdown() throws Exception {        if (server != null) {            server.awaitTermination();        }    }    /**     * @param args     * @throws Exception      */    public static void main(String[] args) throws Exception {        // TODO Auto-generated method stub        GrpcServer server = new GrpcServer();        server.start();        server.blockUntilShutdown();    }    private class UserServiceImpl extends UserServiceGrpc.UserServiceImplBase {        @Override        public void query(Req request, StreamObserver<Resp> responseObserver) {            // TODO Auto-generated method stub            System.out.println("service:" + request.getUsername());            PersonProbuf.Person rp = PersonProbuf.Person.newBuilder()                    .setUsername(request.getUsername()).setAge(100).build();            Resp resp = Resp.newBuilder().setPerson(rp).build();            responseObserver.onNext(resp);            responseObserver.onCompleted();        }    }}/** * Revision history * ------------------------------------------------------------------------- *  * Date Author Note * ------------------------------------------------------------------------- * 2017年8月2日 chiwei create */

编写客户端代码

package com.cmcc.grpc;import io.grpc.ManagedChannel;import io.grpc.ManagedChannelBuilder;import java.util.concurrent.TimeUnit;import com.cmcc.protobuf.PersonProbuf.Req;import com.cmcc.protobuf.PersonProbuf.Resp;import com.cmcc.protobuf.UserServiceGrpc;/** * @Type GrpcClient.java * @Desc  * @author chiwei * @date 2017年8月2日 下午3:20:09 * @version  *//** * @author chiwei * */public class GrpcClient {    private ManagedChannel channel;    private UserServiceGrpc.UserServiceBlockingStub blockingStub;    public GrpcClient(String host, int port) {        channel = ManagedChannelBuilder.forAddress(host, port).usePlaintext(true).build();        blockingStub = UserServiceGrpc.newBlockingStub(channel);    }    public void shutdown() throws Exception {        channel.shutdown().awaitTermination(5, TimeUnit.SECONDS);    }    public void query(String name) {        Req req = Req.newBuilder().setUsername(name).build();        Resp resp = blockingStub.query(req);        System.out.println("客户端获取服务端响应信息：" + resp.getPerson());    }    /**     * @param args     */    public static void main(String[] args) {        // TODO Auto-generated method stub        GrpcClient client = new GrpcClient("127.0.0.1", 50011);        for (int i = 0; i < 5; i++) {            client.query("chiwei" + i);        }    }}/** * Revision history * ------------------------------------------------------------------------- *  * Date Author Note * ------------------------------------------------------------------------- * 2017年8月2日 chiwei create */

执行即可。

pom文件如下：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>grpc</groupId><artifactId>grpc</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>grpc</name><url>http://maven.apache.org</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><grpc.version>1.0.1</grpc.version></properties><dependencies><dependency><groupId>io.grpc</groupId><artifactId>grpc-netty</artifactId><version>${grpc.version}</version></dependency><dependency><groupId>io.grpc</groupId><artifactId>grpc-protobuf</artifactId><version>${grpc.version}</version></dependency><dependency><groupId>io.grpc</groupId><artifactId>grpc-stub</artifactId><version>${grpc.version}</version></dependency><dependency><groupId>com.google.protobuf</groupId><artifactId>protobuf-java</artifactId><version>3.1.0</version></dependency><dependency><groupId>io.grpc</groupId><artifactId>grpc-core</artifactId><version>${grpc.version}</version></dependency><dependency><groupId>io.grpc</groupId><artifactId>grpc-all</artifactId><version>${grpc.version}</version></dependency></dependencies><build><finalName>com.ytf.rpc.demo</finalName><extensions><extension><groupId>kr.motd.maven</groupId><artifactId>os-maven-plugin</artifactId><version>1.5.0.Final</version></extension></extensions><plugins><plugin><groupId>org.xolstice.maven.plugins</groupId><artifactId>protobuf-maven-plugin</artifactId><version>0.5.0</version><configuration><protocArtifact>com.google.protobuf:protoc:3.1.0:exe:${os.detected.classifier}</protocArtifact><pluginId>grpc-java</pluginId><pluginArtifact>io.grpc:protoc-gen-grpc-java:1.0.1:exe:${os.detected.classifier}</pluginArtifact></configuration><executions><execution><goals><goal>compile</goal><goal>compile-custom</goal></goals></execution></executions></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>2.3.2</version><configuration><source>1.8</source><target>1.8</target></configuration></plugin></plugins></build></project>

这是官网的一张图，支持多语言