dubbo复习：（11）使用grpc客户端访问tripple协议的dubbo 服务器

一、服务器端依赖：

<?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>org.example</groupId><artifactId>dubbotrippleserver</artifactId><version>1.0-SNAPSHOT</version><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target><dubbo.version>3.1.8</dubbo.version></properties><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13</version><scope>test</scope></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo</artifactId><version>${dubbo.version}</version></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo-dependencies-zookeeper-curator5</artifactId><type>pom</type><version>${dubbo.version}</version></dependency><dependency><groupId>com.google.protobuf</groupId><artifactId>protobuf-java</artifactId><version>3.19.4</version></dependency></dependencies><build><extensions><extension><groupId>kr.motd.maven</groupId><artifactId>os-maven-plugin</artifactId><version>1.6.1</version></extension></extensions><plugins><plugin><groupId>org.xolstice.maven.plugins</groupId><artifactId>protobuf-maven-plugin</artifactId><version>0.6.1</version><configuration><protocArtifact>com.google.protobuf:protoc:3.19.4:exe:${os.detected.classifier}</protocArtifact><protocPlugins><protocPlugin><id>dubbo</id><groupId>org.apache.dubbo</groupId><artifactId>dubbo-compiler</artifactId><version>${dubbo.version}</version><mainClass>org.apache.dubbo.gen.tri.Dubbo3TripleGenerator</mainClass></protocPlugin></protocPlugins></configuration><executions><execution><goals><goal>compile</goal></goals></execution></executions></plugin></plugins></build></project>

二、服务器端hello.proto文件,位于src/main/proto

syntax = "proto3";option java_multiple_files = true;
option java_package = "cn.edu.tju.hello";
option java_outer_classname = "HelloWorldProto";
option objc_class_prefix = "TEST";package helloworld;message HelloRequest {string name = 1;
}message HelloReply {string message = 1;
}
service Greeter{rpc greet(HelloRequest) returns (HelloReply);
}

三、maven compile生成接口定义文件(点击compile)
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执行后生成文件

将其剪切到src/main/java(也可以配置maven直接生成到指定位置)
四、新建一个接口实现类：

package cn.edu.tju.hello;import cn.edu.tju.hello.DubboGreeterTriple;
import cn.edu.tju.hello.HelloReply;
import cn.edu.tju.hello.HelloRequest;public class GreeterImpl extends DubboGreeterTriple.GreeterImplBase {@Overridepublic HelloReply greet(HelloRequest request) {return HelloReply.newBuilder().setMessage("[Dubbo] " + request.getName() + "!").build();}
}

五、编写dubbo服务端主类，然后运行(其中注册中心的地址为zookeeper 3.6.2)

package cn.edu.tju.test;import cn.edu.tju.hello.Greeter;
import org.apache.dubbo.common.constants.CommonConstants;
import org.apache.dubbo.config.*;
import org.apache.dubbo.config.bootstrap.DubboBootstrap;import java.io.IOException;public class MyDubboServer {public static void main(String[] args) throws IOException {ServiceConfig<Greeter> service = new ServiceConfig<>();service.setInterface(Greeter.class);service.setRef(new GreeterImpl());DubboBootstrap bootstrap = DubboBootstrap.getInstance();bootstrap.application(new ApplicationConfig("myServer")).registry(new RegistryConfig("zookeeper://xx.xx.xx.xx:2181")).protocol(new ProtocolConfig(CommonConstants.TRIPLE, 50092)).service(service).start();System.out.println("Dubbo triple stub server started");System.in.read();}
}

六、grpc客户端依赖：

<?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>org.example</groupId><artifactId>grpcclient</artifactId><version>1.0-SNAPSHOT</version><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target><grpc-version>1.54.0</grpc-version></properties><dependencies><dependency><groupId>io.grpc</groupId><artifactId>grpc-core</artifactId><version>${grpc-version}</version></dependency><dependency><groupId>io.grpc</groupId><artifactId>grpc-netty-shaded</artifactId><version>${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>3.22.2</version></dependency></dependencies><build><extensions><extension><groupId>kr.motd.maven</groupId><artifactId>os-maven-plugin</artifactId><version>1.7.1</version></extension></extensions><plugins><plugin><groupId>org.xolstice.maven.plugins</groupId><artifactId>protobuf-maven-plugin</artifactId><version>0.6.1</version><configuration><protocArtifact>com.google.protobuf:protoc:3.21.7:exe:${os.detected.classifier}</protocArtifact><pluginId>grpc-java</pluginId><pluginArtifact>io.grpc:protoc-gen-grpc-java:1.54.0:exe:${os.detected.classifier}</pluginArtifact></configuration><executions><execution><goals><goal>compile</goal><goal>compile-custom</goal></goals></execution></executions></plugin></plugins></build>
</project>

七、客户端proto(scr/main/proto/hello.proto)和服务端的相同

syntax = "proto3";option java_multiple_files = true;
option java_package = "cn.edu.tju.hello";
option java_outer_classname = "HelloWorldProto";
option objc_class_prefix = "TEST";package helloworld;message HelloRequest {string name = 1;
}message HelloReply {string message = 1;
}
service Greeter{rpc greet(HelloRequest) returns (HelloReply);
}

执行maven compile,生成代码
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根据包名，将生成的代码剪切到scr/main/java下。
八、编写grpc客户端主类，来访问dubbo服务端

package cn.edu.tju.hello;import io.grpc.Channel;
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;public class MyHelloClient {private static final Logger logger = Logger.getLogger(MyHelloClient.class.getName());private final GreeterGrpc.GreeterBlockingStub blockingStub;public MyHelloClient(Channel channel) {blockingStub = GreeterGrpc.newBlockingStub(channel);}public void greet(String name) {logger.info("Will try to greet " + name +" ...");HelloRequest request = HelloRequest.newBuilder().setName(name).build();HelloReply response;try {response = blockingStub.greet(request);} catch (Exception ex) {logger.info(ex.getMessage());return;}logger.info("来自服务器的响应: " + response.getMessage());}public static void main(String[] args) throws Exception {String user = "【爱因斯坦】";String target = "localhost:50097";ManagedChannel channel = ManagedChannelBuilder.forTarget(target).usePlaintext().build();try {MyHelloClient client = new MyHelloClient(channel);client.greet(user);}catch (Exception ex){System.out.println(ex.getMessage());}finally {channel.shutdownNow().awaitTermination(5, TimeUnit.SECONDS);}}
}

九、客户端运行结果
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