SpringBoot使用protobuf格式的接口建立SpringBoot项目，pom.xml内容如下：
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.2.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example.protobuf</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>demo</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>com.google.protobuf</groupId> <artifactId>protobuf-java</artifactId> <version>3.11.0</version> </dependency> <dependency> <groupId>com.google.protobuf</groupId> <artifactId>protobuf-java-util</artifactId> <version>3.11.0</version> </dependency> <dependency> <groupId>com.googlecode.protobuf-java-format</groupId> <artifactId>protobuf-java-format</artifactId> <version>1.2</version> </dependency> <!-- 网络请求依赖 --> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.2</version> </dependency> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpcore</artifactId> <version>4.4</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.0</version> </dependency> <dependency> <groupId>commons-collections</groupId> <artifactId>commons-collections</artifactId> <version>3.0</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>
编写.proto文件，内容如下：
user_login.proto：
syntax = "proto3";option java_package = "com.boomsecret.protobuf";option java_outer_classname = "MessageUserLogin";message MessageUserLoginRequest { string username = 1; string password = 2;}message MessageUserLoginResponse { string access_token = 1; string username = 2;}
生成java代码：
protoc.exe --java_out=./ user_login.proto
将生成的代码移动到你的项目中合适位置：
编写protobuf格式的Controller接口：
package com.example.protobuf.demo.controller;import com.boomsecret.protobuf.MessageUserLogin;import org.apache.http.HttpResponse;import org.apache.http.client.methods.HttpPost;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import util.HttpUtils;import java.net.URI;import java.util.UUID;@Controllerpublic class TestController { @RequestMapping(value = "/demo/test", produces = "application/x-protobuf") @ResponseBody public MessageUserLogin.MessageUserLoginResponse getPersonProto(@RequestBody MessageUserLogin.MessageUserLoginRequest request) { MessageUserLogin.MessageUserLoginResponse.Builder builder = MessageUserLogin.MessageUserLoginResponse.newBuilder(); builder.setAccessToken(UUID.randomUUID().toString()+"_res"); builder.setUsername(request.getUsername()+"_res"); return builder.build(); }}
编写测试类，通过HttpClient工具调用接口：
package com.example.protobuf.demo;import com.boomsecret.protobuf.MessageUserLogin;import org.apache.http.HttpResponse;import org.apache.http.client.methods.HttpPost;import org.junit.jupiter.api.Test;import org.springframework.boot.test.context.SpringBootTest;import util.HttpUtils;import java.net.URI;@SpringBootTestclass DemoApplicationTests { @Test void contextLoads() { } @Test public void test() { try { URI uri = new URI("http", null, "127.0.0.1", 8080, "/demo/test", "", null); HttpPost request = new HttpPost(uri); MessageUserLogin.MessageUserLoginRequest.Builder builder = MessageUserLogin.MessageUserLoginRequest.newBuilder(); builder.setUsername("tom"); builder.setPassword("123456"); HttpResponse response = HttpUtils.doPost(request, builder.build()); MessageUserLogin.MessageUserLoginResponse messageUserLoginResponse = MessageUserLogin.MessageUserLoginResponse.parseFrom(response.getEntity().getContent()); System.err.println(messageUserLoginResponse.getAccessToken()); } catch (Exception e) { } }}
HttpUtils内容如下：
package util;import com.google.protobuf.GeneratedMessageV3;import com.googlecode.protobuf.format.JsonFormat;import org.apache.http.Header;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.InputStreamEntity;import org.apache.http.impl.client.HttpClients;import java.io.ByteArrayInputStream;import java.io.IOException;/** * @author wangjinliang on 2018/10/18. */public class HttpUtils { public static HttpResponse doPost(HttpPost post, GeneratedMessageV3 message) throws IOException { HttpClient httpclient = HttpClients.createDefault(); String requestUrl = post.getURI().toString(); ByteArrayInputStream inputStream = new ByteArrayInputStream(message.toByteArray()); InputStreamEntity inputStreamEntity = new InputStreamEntity(inputStream); post.setEntity(inputStreamEntity); post.addHeader("Content-Type", "application/x-protobuf"); for (Header header : post.getAllHeaders()) { System.out.println(header.getName() + ":" + header.getValue()); } StringBuilder sb = new StringBuilder(); sb.append("curl -XPOST "); for (Header header : post.getAllHeaders()) { sb.append(" -H \"").append(header.getName()).append(":").append(header.getValue()).append("\""); } String jsonBody = JsonFormat.printToString(message); jsonBody = jsonBody.replace("\"", "\\\""); sb.append(" -d \"").append(jsonBody).append("\""); sb.append(" ").append(requestUrl); System.out.println(sb.toString()); return httpclient.execute(post); }}
以debug方式运行SpringBoot项目，并在controller加断点，然后运行测试代码：
可以看到请求过来的数据是正确的，放行后可以看到响应数据也是正确的：
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
无论才能知识多么卓着，如果缺乏热情，则无异纸上画饼充饥，无补于事。
