内容简介：grpc-java简单使用
grpc的相关介绍就不赘言了。
直接进入正题
首先，创建一个项目。配置pom
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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>com.moensun</groupId>
<artifactId>grpc-java-demo</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-netty</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-protobuf</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-stub</artifactId>
<version>1.3.0</version>
</dependency>
</dependencies>
<build>
<extensions>
<extension>
<groupId>kr.motd.maven</groupId>
<artifactId>os-maven-plugin</artifactId>
<version>1.4.1.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:3.2.0:exe:${os.detected.classifier}</protocArtifact>
<pluginId>grpc-java</pluginId>
<pluginArtifact>io.grpc:protoc-gen-grpc-java:1.3.0:exe:${os.detected.classifier}</pluginArtifact>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>compile-custom</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
java-grpc中，proto的文件默认是放在与 java 文件夹平级的proto的文件夹中的。
HelloWord.proto
syntax = "proto3";
option java_multiple_files = true;
option java_package = "com.moensun.grpc.service";
option java_outer_classname = "HelloWorldProto";
option objc_class_prefix = "HLW";
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;
}
有了这么些配置之后，要生产对象文件和接口文件。一开始的时候，是用的插件里的compile执行的。但是接口文件一直生成不了。这边是需要用mvn 的compile执行才可以全部生成的。
服务端
package com.moensun.grpc;
import com.moensun.grpc.service.GreeterGrpc;
import com.moensun.grpc.service.HelloReply;
import com.moensun.grpc.service.HelloRequest;
import io.grpc.Server;
import io.grpc.ServerBuilder;
import io.grpc.stub.StreamObserver;
import java.io.IOException;
import java.util.logging.Logger;
/**
* Created by Bane.Shi.
* Copyright MoenSun
* User: Bane.Shi
* Date: 2017/6/10
* Time: 8:13
*/
public class HelloServer {
private static final Logger logger = Logger.getLogger(HelloServer.class.getName());
private int port = 50051;
private Server server;
private void start() throws IOException {
server = ServerBuilder.forPort(port)
.addService(new GreeterImpl())
.build()
.start();
logger.info("Server started, listening on "+ port);
Runtime.getRuntime().addShutdownHook(new Thread(){
@Override
public void run(){
System.err.println("*** shutting down gRPC server since JVM is shutting down");
HelloServer.this.stop();
System.err.println("*** server shut down");
}
});
}
private void stop(){
if (server != null){
server.shutdown();
}
}
// block 一直到退出程序
private void blockUntilShutdown() throws InterruptedException {
if (server != null){
server.awaitTermination();
}
}
public static void main(String[] args) throws IOException, InterruptedException {
final HelloServer server = new HelloServer();
server.start();
server.blockUntilShutdown();
}
// 实现 定义一个实现服务接口的类
private class GreeterImpl extends GreeterGrpc.GreeterImplBase {
@Override
public void sayHello(HelloRequest req,StreamObserver<HelloReply> responseObserver){
HelloReply reply = HelloReply.newBuilder().setMessage(("Hello "+req.getName())).build();
System.out.println(reply.getMessage().toString());
responseObserver.onNext(reply);
responseObserver.onCompleted();
}
}
}
客户端
package com.moensun.grpc;
import com.moensun.grpc.service.GreeterGrpc;
import com.moensun.grpc.service.HelloReply;
import com.moensun.grpc.service.HelloRequest;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import io.grpc.StatusRuntimeException;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Created by Bane.Shi.
* Copyright MoenSun
* User: Bane.Shi
* Date: 2017/6/10
* Time: 8:26
*/
public class HelloWordClient {
private final ManagedChannel channel;
private final GreeterGrpc.GreeterBlockingStub blockingStub;
private static final Logger logger = Logger.getLogger(HelloWordClient.class.getName());
public HelloWordClient(String host,int port){
channel = ManagedChannelBuilder.forAddress(host,port)
.usePlaintext(true)
.build();
blockingStub = GreeterGrpc.newBlockingStub(channel);
}
public void shutdown() throws InterruptedException {
channel.shutdown().awaitTermination(5, TimeUnit.SECONDS);
}
public void greet(String name){
HelloRequest request = HelloRequest.newBuilder().setName(name).build();
HelloReply response;
try{
response = blockingStub.sayHello(request);
} catch (StatusRuntimeException e)
{
logger.log(Level.WARNING, "RPC failed: {0}", e.getStatus());
return;
}
logger.info("Greeting: "+response.getMessage());
}
public static void main(String[] args) throws InterruptedException {
HelloWordClient client = new HelloWordClient("127.0.0.1",50051);
try{
String user = "world";
if (args.length > 0){
user = args[0];
}
client.greet(user);
}finally {
client.shutdown();
}
}
}
以上所述就是小编给大家介绍的《grpc-java简单使用》，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持！
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