SpringBoot使用protobuf格式的接口方式

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;

@Controller
public 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;

@SpringBootTest
class 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我们。