目录
创建maven父工程spring-boot-grpc
创建模块spring-boot-grpc-lib
创建模块local-server(gRPC服务端)
创建模块local-client(gRPC客户端)
创建springboot项目,勾选springboot-web即可
4.0.0 pom spring-boot-grpc-lib local-server local-client org.springframework.boot spring-boot-starter-parent 2.5.6 com.chenj spring-boot-grpc 0.0.1-SNAPSHOT spring-boot-grpc Demo project for Spring Boot 1.8 org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test
在父工程spring-boot-grpc下新建maven模块,名为spring-boot-grpc-lib
spring-boot-grpc com.chenj 0.0.1-SNAPSHOT 4.0.0 spring-boot-grpc-lib UTF-8 1.8 1.8 io.grpc grpc-netty-shaded 1.37.0 io.grpc grpc-protobuf 1.37.0 io.grpc grpc-stub 1.37.0 org.apache.tomcat annotations-api 6.0.53 provided kr.motd.maven os-maven-plugin 1.6.2 org.xolstice.maven.plugins protobuf-maven-plugin 0.6.1 com.google.protobuf:protoc:3.17.3:exe:${os.detected.classifier} grpc-java io.grpc:protoc-gen-grpc-java:1.37.0:exe:${os.detected.classifier} compile compile-custom
在spring-boot-grpc-lib模块的src/main/proto目录下新增名为helloworld.proto的文件,这里面定义了一个gRPC服务,里面含有一个接口,并且还有这个接口的入参和返回结果的定义:
syntax = "proto3";option java_multiple_files = true;
option java_package = "com.chenj.grpc.lib";
option java_outer_classname = "HelloWorldProto";// The greeting service definition.
service Simple {// Sends a greetingrpc 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;
}
proto文件已经做好,接下来要根据这个文件来生成Java代码
SimpleGrpc里面有抽象类SimpleImplBase,制作gRPC服务的时候需要继承该类,另外,如果您要远程调用gRPC的sayHello接口,就会用到SimpleGrpc类中的SimpleStub类,其余的HelloReply、HelloRequest这些则是入参和返回的数据结构定义
在父工程下面新建名为local-server的springboot模块,
gRPC 服务端使用一下命令添加 Maven 依赖项
net.devh grpc-server-spring-boot-starter 2.12.0.RELEASE
依赖上面的spring-boot-grpc-lib模块
com.chenj spring-boot-grpc-lib 0.0.1-SNAPSHOT
完整的pom.xml文件
4.0.0 spring-boot-grpc com.chenj 0.0.1-SNAPSHOT com.chenj local-server 0.0.1-SNAPSHOT local-server Demo project for Spring Boot 1.8 net.devh grpc-server-spring-boot-starter 2.12.0.RELEASE com.chenj spring-boot-grpc-lib 0.0.1-SNAPSHOT org.projectlombok lombok
springboot应用,配置文件内容如下:
spring:application:name: spring-boot-grpc-server
# gRPC有关的配置,这里只需要配置服务端口号
grpc:server:port: 9898
server:port: 8080
新建拦截类LogGrpcInterceptor.java,每当gRPC请求到来后该类会先执行,这里是将方法名字在日志中打印出来,您可以对请求响应做更详细的处理:
package com.chenj.springbootgrpcserver.interceptor;import io.grpc.Metadata;
import io.grpc.ServerCall;
import io.grpc.ServerCallHandler;
import io.grpc.ServerInterceptor;
import lombok.extern.slf4j.Slf4j;@Slf4j
public class LogGrpcInterceptor implements ServerInterceptor {@Overridepublic ServerCall.Listener interceptCall(ServerCall serverCall, Metadata metadata,ServerCallHandler serverCallHandler) {log.info(serverCall.getMethodDescriptor().getFullMethodName());return serverCallHandler.startCall(serverCall, metadata);}
}
为了让LogGrpcInterceptor可以在gRPC请求到来时被执行,需要做相应的配置,如下所示,在普通的bean的配置中添加注解即可:
package com.chenj.springbootgrpcserver.config;import com.chenj.springbootgrpcserver.interceptor.LogGrpcInterceptor;
import io.grpc.ServerInterceptor;
import net.devh.boot.grpc.server.interceptor.GrpcGlobalServerInterceptor;
import org.springframework.context.annotation.Configuration;@Configuration(proxyBeanMethods = false)
public class GlobalInterceptorConfiguration {@GrpcGlobalServerInterceptorServerInterceptor logServerInterceptor() {return new LogGrpcInterceptor();}
}
应用启动类很简单:
package com.chenj.springbootgrpcserver;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class SpringBootGrpcServerApplication {public static void main(String[] args) {SpringApplication.run(SpringBootGrpcServerApplication.class, args);}}
接下来是最重要的service类,gRPC服务在此处对外暴露出去,完整代码如下
package com.chenj.springbootgrpcserver.service;import com.chenj.grpc.lib.HelloReply;
import com.chenj.grpc.lib.HelloRequest;
import com.chenj.grpc.lib.SimpleGrpc;
import io.grpc.stub.StreamObserver;
import net.devh.boot.grpc.server.service.GrpcService;import java.util.Date;@GrpcService
public class GrpcServerService extends SimpleGrpc.SimpleImplBase {@Overridepublic void sayHello(HelloRequest request,StreamObserver responseObserver) {HelloReply reply = HelloReply.newBuilder().setMessage("你好, " + request.getName() + ", " + new Date()).build();responseObserver.onNext(reply);responseObserver.onCompleted();}
}
上述GrpcServerService.java中有几处需要注意:
是使用@GrpcService注解,再继承SimpleImplBase,这样就可以借助grpc-server-spring-boot-starter库将sayHello暴露为gRPC服务;
SimpleImplBase是前文中根据proto自动生成的java代码,在spring-boot-grpc-lib模块中;
sayHello方法中处理完毕业务逻辑后,调用HelloReply.onNext方法填入返回内容;
调用HelloReply.onCompleted方法表示本次gRPC服务完成;
至此,gRPC服务端编码就完成了,咱们接着开始客户端开发
在父工程grpc-turtorials下面新建名为local-client的模块
gRPC客户端使用一下命令添加 Maven 依赖项:
net.devh grpc-client-spring-boot-starter 2.12.0.RELEASE
依赖上面的spring-boot-grpc-lib模块
com.chenj spring-boot-grpc-lib 0.0.1-SNAPSHOT
完整的pom.xml文件
4.0.0 spring-boot-grpc com.chenj 0.0.1-SNAPSHOT com.chenj local-client 0.0.1-SNAPSHOT local-client Demo project for Spring Boot 1.8 net.devh grpc-client-spring-boot-starter 2.12.0.RELEASE com.chenj spring-boot-grpc-lib 0.0.1-SNAPSHOT org.springframework.boot spring-boot-maven-plugin
应用配置文件src/main/resources/application.yml,注意address的值就是gRPC服务端的信息,我这里local-server和local-client在同一台电脑上运行,请您根据自己情况来设置:
server:port: 8088
spring:application:name: local-clientgrpc:client:# gRPC配置的名字,GrpcClient注解会用到local-grpc-server:# gRPC服务端地址address: 'static://127.0.0.1:9898'enableKeepAlive: truekeepAliveWithoutCalls: truenegotiationType: plaintext
新建拦截类LogGrpcInterceptor,与服务端的拦截类差不多,不过实现的接口不同:
package com.chenj.springbootgrpcclient.interceptor;import io.grpc.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;public class LogGrpcInterceptor implements ClientInterceptor {private static final Logger log = LoggerFactory.getLogger(LogGrpcInterceptor.class);@Overridepublic ClientCall interceptCall(MethodDescriptor method,CallOptions callOptions, Channel next) {log.info(method.getFullMethodName());return next.newCall(method, callOptions);}
}
为了让拦截类能够正常工作,即发起gRPC请求的时候被执行,需要新增一个配置类:
package com.chenj.springbootgrpcclient.config;import com.chenj.springbootgrpcclient.interceptor.LogGrpcInterceptor;
import io.grpc.ClientInterceptor;
import net.devh.boot.grpc.client.interceptor.GrpcGlobalClientInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;@Order(Ordered.LOWEST_PRECEDENCE)
@Configuration(proxyBeanMethods = false)
public class GlobalClientInterceptorConfiguration {@GrpcGlobalClientInterceptorClientInterceptor logClientInterceptor() {return new LogGrpcInterceptor();}
}
启动类:
package com.chenj.springbootgrpcclient;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class SpringBootGrpcClientApplication {public static void main(String[] args) {SpringApplication.run(SpringBootGrpcClientApplication.class, args);}}
接下来是最重要的服务类GrpcClientService
package com.chenj.springbootgrpcclient.service;import com.chenj.grpc.lib.HelloReply;
import com.chenj.grpc.lib.HelloRequest;
import com.chenj.grpc.lib.SimpleGrpc;
import io.grpc.StatusRuntimeException;
import net.devh.boot.grpc.client.inject.GrpcClient;
import org.springframework.stereotype.Service;@Service
public class GrpcClientService {@GrpcClient("local-grpc-server")private SimpleGrpc.SimpleBlockingStub simpleStub;public String sendMessage(final String name) {try {final HelloReply response = this.simpleStub.sayHello(HelloRequest.newBuilder().setName(name).build());return response.getMessage();} catch (final StatusRuntimeException e) {return "FAILED with " + e.getStatus().getCode().name();}}
}
上述GrpcClientService类有几处要注意的地方:
用@Service将GrpcClientService注册为spring的普通bean实例;
用@GrpcClient修饰SimpleBlockingStub,这样就可以通过grpc-client-spring-boot-starter库发起gRPC调用,被调用的服务端信息来自名为local-grpc-server的配置;
SimpleBlockingStub来自前文中根据helloworld.proto生成的java代码;
SimpleBlockingStub.sayHello方法会远程调用local-server应用的gRPC服务;
为了验证gRPC服务调用能否成功,再新增个web接口,接口内部会调用GrpcClientService.sendMessage,这样咱们通过浏览器就能验证gRPC服务是否调用成功了:
package com.chenj.springbootgrpcclient.controller;import com.chenj.springbootgrpcclient.service.GrpcClientService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;@RestController
public class GrpcClientController {@Autowiredprivate GrpcClientService grpcClientService;@RequestMapping("/")public String printMessage(@RequestParam(defaultValue = "will") String name) {return grpcClientService.sendMessage(name);}
}