【JAVA】gRPC使用

 

无意中发现了一个巨牛的人工智能教程，忍不住分享一下给大家。教程不仅是零基础，通俗易懂，而且非常风趣幽默，像看小说一样！觉得太牛了，所以分享给大家。点这里可以跳转到教程。

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 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：

 

	4.0.0

	grpc
	grpc
	0.0.1-SNAPSHOT
	jar

	grpc
	http://maven.apache.org

	
		UTF-8
		1.0.1
	
	
		
			io.grpc
			grpc-netty
			${grpc.version}
		
		
			io.grpc
			grpc-protobuf
			${grpc.version}
		
		
			io.grpc
			grpc-stub
			${grpc.version}
		
		
			com.google.protobuf
			protobuf-java
			3.1.0
		
		
			io.grpc
			grpc-core
			${grpc.version}
		
		
			io.grpc
			grpc-all
			${grpc.version}
		
	
	
		com.ytf.rpc.demo
		
			
				kr.motd.maven
				os-maven-plugin
				1.5.0.Final
			
		
		
			
				org.xolstice.maven.plugins
				protobuf-maven-plugin
				0.5.0
				
					com.google.protobuf:protoc:3.1.0:exe:${os.detected.classifier}
					grpc-java
					io.grpc:protoc-gen-grpc-java:1.0.1:exe:${os.detected.classifier}
				
				
					
						
							compile
							compile-custom
						
					
				
			
			
				org.apache.maven.plugins
				maven-compiler-plugin
				2.3.2
				
					1.8
					1.8
				
			
		
	

 

 

 

 

 

 

 

这是官网的一张图，支持多语言