1.windows下基本环境安装
1.1 安装 protoc 编译器
https://www.jianshu.com/p/051e48410a9d (参考此文)
1.2 安装 protoc-gen-grpc-java 插件
1.2.1 搜索并下载 protoc-gen-grpc-java 插件
1.2.2 环境变量配置
#假设下载到的位置是
E:/rpc/protoc-gen-grpc-java-1.30.2-windows-x86_64.exe
#配置环境变量, 添加 path 即可
2.使用示例
2.1 pom.xml
<dependencies>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-netty-shaded</artifactId>
<version>1.30.2</version>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-protobuf</artifactId>
<version>1.30.2</version>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-stub</artifactId>
<version>1.30.2</version>
</dependency>
</dependencies>
<build>
<extensions>
<extension>
<groupId>kr.motd.maven</groupId>
<artifactId>os-maven-plugin</artifactId>
<version>1.6.2</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:3.12.0:exe:${os.detected.classifier}</protocArtifact>
<pluginId>grpc-java</pluginId>
<pluginArtifact>io.grpc:protoc-gen-grpc-java:1.30.2:exe:${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>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
</plugins>
</build>
2.2 编写 proto 文件 ==> Stu.proto
// 编写.proto文件参考 --> https://developers.google.cn/protocol-buffers/docs/proto3
// 生成grpc代码 --> 参考 https://github.com/grpc/grpc-java
// For protobuf-based codegen, you can put your proto files in the
// src/main/proto and src/test/proto directories along with an appropriate plugin.
syntax = "proto3";
option java_package = "com.zy.grpc.proto.server";
option java_outer_classname = "Student";
option java_multiple_files = true;
// 这里的出入参 --> 必须是 message, 不能单独用 int32, string 等基本类型
service StudentService {
// 1.入参是 对象, 出参也是对象
rpc QueryStuById(SearchRequest) returns (SearchResponse);
// 2.入参是 对象, 出参是流
rpc QueryStuByIdStream2Resp(SearchRequest) returns (stream StuResponse);
// 3.入参是 流, 出参是对象: 异步实现
rpc QueryStuByIdReqByStream(stream SearchRequest) returns (StuResponseList);
// 4.入参是 流, 出参也是流: 异步实现
rpc QueryStuByIdReqAndResp2Stream(stream StuRequestStream) returns (stream StuResponseStream);
}
message SearchRequest {
string id = 1;
// int32 page_number = 2;
// int32 result_per_page = 3;
}
message SearchResponse {
string name = 1;
}
message StuResponse {
string id = 1;
string name = 2;
string age = 3;
}
message StuResponseList {
repeated StuResponse stuResponse = 1;
}
message StuRequestStream {
string req = 1;
}
message StuResponseStream {
string resp = 1;
}
2.3 执行命令, 生成代码
#生成message的命令 (注意执行命令时, 所在的目录)
protoc --java_out=src/main/java src/main/resources/proto/Stu.proto
#生成grpc-service的命令 (注意执行命令时, 所在的目录)
protoc --plugin=protoc-gen-grpc-java=E:/rpc/protoc-gen-grpc-java-1.30.2-windows-x86_64.exe --grpc-java_out=src/main/java src/main/resources/proto/Stu.proto
2.4 编写 grpc-server, grpc-client
2.4.1 grpc-server
package com.zy.grpc.proto.server.peer;
import com.zy.grpc.proto.server.message.*;
import com.zy.grpc.proto.server.service.StudentServiceGrpc;
import io.grpc.Server;
import io.grpc.ServerBuilder;
import io.grpc.stub.StreamObserver;
import java.io.IOException;
/**
* server 与 client 参考
* https://www.grpc.io/docs/quickstart/java/ 生成的 HelloWorldServer 与 HelloWorldClient
*/
public class GrpcServer {
private Server server;
public static void main(String[] args) throws InterruptedException, IOException {
GrpcServer grpcServer = new GrpcServer();
grpcServer.start();
grpcServer.blockUntilShutdown();
}
private void start() throws IOException {
this.server = ServerBuilder.forPort(9090).addService(new StudentServiceImpl()).build().start();
System.out.println("server started");
Runtime.getRuntime().addShutdownHook(new Thread(() -> {
System.err.println("*** shutting down gRPC server since JVM is shutting down");
GrpcServer.this.stop();
System.err.println("*** server shut down");
}));
}
private void stop() {
if (this.server != null) {
this.server.shutdown();
}
}
private void blockUntilShutdown() throws InterruptedException {
if (this.server != null) {
this.server.awaitTermination();
}
}
static class StudentServiceImpl extends StudentServiceGrpc.StudentServiceImplBase {
/**
* 1.入参是 对象, 出参也是对象
*
* @param request
* @param responseObserver
*/
@Override
public void queryStuById(SearchRequest request, StreamObserver<SearchResponse> responseObserver) {
System.out.println("客户端请求参数id为: " + request.getId());
// 当发生异常时, 回调函数为:
// responseObserver.onError(new RuntimeException("there is an error to request by id"));
// 当成功时, 回调函数为:
responseObserver.onNext(SearchResponse.newBuilder().setName("tom" + request.getId()).build());
// 当完成时, 回调函数为:
responseObserver.onCompleted();
}
/**
* 2.入参是 对象, 出参是流
*
* @param request
* @param responseObserver
*/
@Override
public void queryStuByIdStream2Resp(SearchRequest request, StreamObserver<StuResponse> responseObserver) {
System.out.println("客户端请求参数id为: " + request.getId());
responseObserver.onNext(StuResponse.newBuilder().setName("stream2Resp --> jerry" + request.getId()).setAge(request.getId()).setId(request.getId()).build());
responseObserver.onNext(StuResponse.newBuilder().setName("stream2Resp --> john" + request.getId()).setAge(request.getId()).setId(request.getId()).build());
responseObserver.onNext(StuResponse.newBuilder().setName("stream2Resp --> trump" + request.getId()).setAge(request.getId()).setId(request.getId()).build());
responseObserver.onCompleted();
}
/**
* 3.入参是 流, 出参是对象: 异步实现
*
* @param responseObserver
* @return
*/
@Override
public StreamObserver<SearchRequest> queryStuByIdReqByStream(StreamObserver<StuResponseList> responseObserver) {
return new StreamObserver<SearchRequest>() {
@Override
public void onNext(SearchRequest value) {
System.out.println("onNext --> " + value.getId());
}
@Override
public void onError(Throwable t) {
System.out.println(t.getMessage());
}
@Override
public void onCompleted() {
StuResponse response1 = StuResponse.newBuilder().setId("1").setName("tommy1").setAge("10").build();
StuResponse response2 = StuResponse.newBuilder().setId("2").setName("tommy2").setAge("20").build();
StuResponseList list = StuResponseList.newBuilder().addStuResponse(response1).addStuResponse(response2).build();
responseObserver.onNext(list);
responseObserver.onCompleted();
}
};
}
/**
* 4.入参是 流, 出参也是流: 异步实现
*
* @param responseObserver
* @return
*/
@Override
public StreamObserver<StuRequestStream> queryStuByIdReqAndResp2Stream(StreamObserver<StuResponseStream> responseObserver) {
return new StreamObserver<StuRequestStream>() {
@Override
public void onNext(StuRequestStream value) {
System.out.println("receive request: " + value.getReq());
responseObserver.onNext(StuResponseStream.newBuilder().setResp("hello" + value.getReq()).build());
}
@Override
public void onError(Throwable t) {
System.out.println(t.getMessage());
}
@Override
public void onCompleted() {
responseObserver.onCompleted();
}
};
}
}
}
2.4.2 grpc-clietn
package com.zy.grpc.proto.server.peer;
import com.zy.grpc.proto.server.message.*;
import com.zy.grpc.proto.server.service.StudentServiceGrpc;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import io.grpc.stub.StreamObserver;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.TimeUnit;
public class GrpcClient {
private final ManagedChannel channel;
private final StudentServiceGrpc.StudentServiceBlockingStub blockingStub;
private final StudentServiceGrpc.StudentServiceStub stub;
public GrpcClient(String host, int port) {
this(ManagedChannelBuilder.forAddress(host, port).usePlaintext().build());
}
GrpcClient(ManagedChannel channel) {
this.channel = channel;
this.blockingStub = StudentServiceGrpc.newBlockingStub(channel);
this.stub = StudentServiceGrpc.newStub(channel);
}
/**
* 1.入参是 对象, 出参也是对象
* @param id
*/
private void queryStuById(String id) {
try {
SearchResponse response = this.blockingStub.queryStuById(SearchRequest.newBuilder().setId(id).build());
System.out.println("response --> " + response.getName());
} catch (Exception e) {
System.out.println("failed to request queryStuById");
e.printStackTrace();
}
}
/**
* 2.入参是 对象, 出参是流
* @param id
*/
private void queryStuByIdStream2Resp(String id) {
try {
Iterator<StuResponse> resp = this.blockingStub.queryStuByIdStream2Resp(SearchRequest.newBuilder().setId(id).build());
while (resp.hasNext()) {
StuResponse next = resp.next();
System.out.println(next);
}
} catch (Exception e) {
System.out.println("failed to request queryStuByIdStream2Resp");
e.printStackTrace();
}
}
/**
* 3.入参是 流, 出参是对象: 异步实现
* @param list
*/
private void queryStuByIdReqByStream(List<String> list) {
if (list == null || list.size() == 0) {
return;
}
StreamObserver<StuResponseList> responseObserver = new StreamObserver<StuResponseList>() {
@Override
public void onNext(StuResponseList value) {
value.getStuResponseList().forEach(System.out::println);
}
@Override
public void onError(Throwable t) {
System.out.println(t.getMessage());
}
@Override
public void onCompleted() {
System.out.println("completed");
}
};
StreamObserver<SearchRequest> requestObserver = stub.queryStuByIdReqByStream(responseObserver);
list.forEach(id -> requestObserver.onNext(SearchRequest.newBuilder().setId(id).build()));
requestObserver.onCompleted();
}
/**
* 4.入参是 流, 出参也是流: 异步实现
* @param list
*/
private void queryStuByIdReqAndResp2Stream(List<String> list) {
if (list == null || list.size() == 0) {
return;
}
StreamObserver<StuResponseStream> responseStreamStreamObserver = new StreamObserver<StuResponseStream>() {
@Override
public void onNext(StuResponseStream value) {
System.out.println(value.getResp());
}
@Override
public void onError(Throwable t) {
System.out.println(t.getMessage());
}
@Override
public void onCompleted() {
System.out.println("completed");
}
};
StreamObserver<StuRequestStream> request = stub.queryStuByIdReqAndResp2Stream(responseStreamStreamObserver);
list.forEach(req -> request.onNext(StuRequestStream.newBuilder().setReq(req).build()));
request.onCompleted();
}
private void shutdown() throws InterruptedException {
this.channel.shutdown().awaitTermination(5L, TimeUnit.SECONDS);
}
public static void main(String[] args) throws InterruptedException {
GrpcClient grpcClient = new GrpcClient("127.0.0.1", 9090);
try {
System.out.println("-----------------------1.入参是 对象, 出参也是对象----------------------");
grpcClient.queryStuById("1");
System.out.println("-----------------------2.入参是 对象, 出参是流----------------------");
grpcClient.queryStuByIdStream2Resp("2");
System.out.println("-----------------------3.入参是 流, 出参是对象: 异步实现-----------------------");
List<String> list = new ArrayList<>();
list.add("1");
list.add("2");
list.add("3");
grpcClient.queryStuByIdReqByStream(list);
System.out.println("-----------------------4.入参是 流, 出参也是流: 异步实现-----------------------");
grpcClient.queryStuByIdReqAndResp2Stream(list);
} finally {
grpcClient.shutdown();
}
}
}