SpringBoot mqtt多模块 SpringBoot集成mqtt的多模块项目配置详解

时间:2021-04-21 KilimiaoSix 人气:0

想了解SpringBoot集成mqtt的多模块项目配置详解的相关内容吗，KilimiaoSix在本文为您仔细讲解SpringBoot mqtt多模块的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：SpringBoot,mqtt多模块,SpringBoot,mqtt，下面大家一起来学习吧。

前言

近期为了准备毕设，准备使用SpringBoot搭建mqtt后端，本篇主要记录了在IDEA中搭建SpringBoot mqtt的多模块项目的过程

开发工具及系统环境

IDE：IntelliJ IDEA 2020.2
操作系统：Windows 10 2004
Java Version：1.8
SpringBoot Version：2.1.17.RELEASE

项目路径

Study
    |----study-common        # 存放公共类
    |----study-mapper        # mapper层
    |----study-mqtt          # mqtt相关配置文件及接口
    |----study-service       # service层
    |----study-serviceimpl   # service的实现类
    |----study-web           # web层 
	|----pom.xml

配置过程

1. 搭建父项目

在IDEA中新建一个SpringBoot工程

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这里我使用了阿里云的启动服务，正常使用可以直接用原本的启动服务

根据你的需求选择Java版本，初始化类型并配置groupID和artifactId，我这里配置成我的域名的反写，并将artifactId定义成Study。配置完成后单击Next

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这一步选择你需求的SpringBoot版本，我这里选择的是2.1.17.RELEASE，然后单击NEXT。在这一步中不需要勾选任何依赖。

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选择保存的路径，点击Finish完成创建。

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删除不需要的文件。将目录下的src/,HELP.md,mvnw,mvnw.cmd等文件全部删除（不包括.gitigore）

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至此，父项目一级已经创建完成，最后项目目录如下：

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2. 搭建子项目

右键项目根目录->新建->新模块

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选择Maven，单击Next

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配置父项，项目名称以及构建坐标，完成后单击Finish。这里以study-common模块为例

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以此类推创建整个项目，项目目录如图所示

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至此，我们搭建完所有的子项目，接下来开始配置各个项目的pom文件

3. 配置各个模块

1. 配置父项目

配置父项目的pom.xml文件

父项目的pom.xml主要是对子项目的引用起到一个约束作用，固在父项目的pom.xml需要使用dependencyManagement这一项来约束子项目中各个依赖的版本。在父项目中可以引用子项目都用得到的引用。父项目的pom.xml文件如下：

<?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>
    <groupId>com.itbu</groupId>
    <artifactId>study</artifactId>
    <packaging>pom</packaging>
    <version>1.0.0</version>
    <modules>
        <module>study-common</module>
        <module>study-service</module>
        <module>study-serviceimpl</module>
        <module>study-web</module>
        <module>study-mapper</module>
        <module>study-mqtt</module>
    </modules>
    <name>study</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <artifactId>spring-boot-starter-parent</artifactId>
        <groupId>org.springframework.boot</groupId>
        <version>2.1.17.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.1.17.RELEASE</spring-boot.version>
        <mybatis.boot.starter.version>2.1.4</mybatis.boot.starter.version>
        <mysql.connector.java.version>8.0.22</mysql.connector.java.version>
        <druid.version>1.2.0</druid.version>
        <integration.version>2.3.7.RELEASE</integration.version>
        <stream.integration.version>5.4.2</stream.integration.version>
        <mqtt.integration.version>5.4.2</mqtt.integration.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-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>${mybatis.boot.starter.version}</version>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.connector.java.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>


        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.1.17.RELEASE</version>
            </plugin>
        </plugins>
    </build>

</project>

2. 配置common模块

配置pom.xml文件

common模块主要包括一些通用的类和接口，固这里只需要配置下parent这一项指向父项目即可，common模块的pom.xml配置文件如下：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>study</artifactId>
        <groupId>com.itbu</groupId>
        <version>1.0.0</version>
    </parent>
    <groupId>com.itbu.study</groupId>
    <artifactId>common</artifactId>
    <version>1.0.0</version>
    <modelVersion>4.0.0</modelVersion>
    <packaging>jar</packaging>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

创建所需要的类和接口

配置完pom.xml后，就可以在目录下创建所需要的类以及接口。在本项目中我分别创建了作为pojo类的UserBean和作为json返回结果的JsonResult类作为通用类，项目结构如下：

study-common
	|----pom.xml
	|----src
		|----test
		|----main
			|----resources
			|----java
				|----com.itbu.study.common
					|----bean
						|----UserBean.java
					|----result
						|----JsonResult.java

UserBean.java文件

package com.itbu.study.common.bean;

public class UserBean {
    private int id;
    private String username;
    private String password;

    public int getId() {
        return id;
    }

    public String getPassword() {
        return password;
    }

    public String getUsername() {
        return username;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public UserBean(){

    }

    public UserBean(String username, String password){
        this.username = username;
        this.password = password;
    }
}

JsonResult.java文件

package com.itbu.study.common.result;

public class JsonResult<T> {
    private int code;
    private String msg;
    private T data;

    public JsonResult(int Code,String msg){
        this.code = Code;
        this.msg = msg;
    }

    public JsonResult(T data) {
        this.data = data;
        this.code = 0;
        this.msg = "操作成功！";
    }

    public JsonResult(T data, String msg) {
        this.data = data;
        this.code = 0;
        this.msg = msg;
    }

    public String getMsg() {
        return msg;
    }

    public int getCode() {
        return code;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public void setCode(int code) {
        this.code = code;
    }
}

3. 配置mapper模块

mapper模块对应的是mapper层，也就是我们常说的DAO层，用于与数据库进行通信，读写操作。这里我们用的持久层框架是Mybatis，连接的数据库是mysql数据库。同时需要common模块中的各个pojo类，这里需要引入各个引用。操作步骤如下：

配置pom.xml文件

这里我们需要引入mybatis，druid和mysql支持，固配置文件编写如下：

<?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>
    <groupId>com.itbu.study</groupId>
    <artifactId>mapper</artifactId>
    <version>1.0.0</version>
    <name>mapper</name>
    <description>Demo project for Spring Boot</description>
    <packaging>jar</packaging>

    <parent>
        <artifactId>study</artifactId>
        <groupId>com.itbu</groupId>
        <version>1.0.0</version>
        <relativePath>../pom.xml</relativePath>
    </parent>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.1.17.RELEASE</spring-boot.version>
    </properties>

    <dependencies>
        <!-- 内部引用 -->
        <dependency>
            <groupId>com.itbu.study</groupId>
            <artifactId>common</artifactId>
            <version>1.0.0</version>
        </dependency>

        <!-- 外部引用 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

编写接口和映射文件

和不分模块的操作一样，在resource文件夹下创建mapper目录，并编写用于映射的xml文件。同时创建对应的接口，本项目工程目录大致如下：

study-mapper
	|----pom.xml
	|----src
		|----test
		|----main
			|----java
				|----com.itbu.study.mapper
					|----UserMapper.java
			|----resources
				|----mapper
					|----UserMapper.xml

UserMapper.java文件

package com.itbu.study.mapper;
import com.itbu.study.common.bean.UserBean;
import java.util.List;
public interface UserMapper {
    List<UserBean> getAll();
}

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.itbu.study.mapper.UserMapper">
    <select id="getAll" resultType="com.itbu.study.common.bean.UserBean">
        select * from mqtt.user_table
    </select>
</mapper>

4. 配置service模块

service模块也就是service层，主要是一些服务接口方便给controller层调用。步骤如下:

配置pom.xml文件

service层需要用到common模块中的pojo类，这里需要对该模块添加依赖项

<?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">
    <parent>
        <artifactId>study</artifactId>
        <groupId>com.itbu</groupId>
        <version>1.0.0</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.itbu.study</groupId>
    <artifactId>service</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>
    <name>service</name>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.itbu.study</groupId>
            <artifactId>common</artifactId>
            <version>1.0.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

编写service各个接口

这里接口与mapper层类似，就不一一赘述，这里直接放代码

UserService.java

package com.itbu.study.service;

import com.itbu.study.common.bean.UserBean;

import java.util.List;

public interface UserService {
    List<UserBean> getAll();
}

5. 配置serviceimpl模块

serviceimpl即service接口的各个实现类，实现步骤如下：

配置pom.xml文件

serviceimpl需要mapper层的支持，需要实现service层的各个接口，也需要引用到common模块中的pojo类，我们直接加上这三项的依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.itbu.study</groupId>
    <artifactId>serviceimpl</artifactId>
    <version>1.0.0</version>
    <name>serviceimpl</name>
    <description>Demo project for Spring Boot</description>
    <packaging>jar</packaging>
    <parent>
        <artifactId>study</artifactId>
        <groupId>com.itbu</groupId>
        <version>1.0.0</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.1.17.RELEASE</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.itbu.study</groupId>
            <artifactId>common</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>com.itbu.study</groupId>
            <artifactId>service</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>com.itbu.study</groupId>
            <artifactId>mapper</artifactId>
            <version>1.0.0</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

根据service各个接口编写实现类

UserServiceimpl.java 注意在实现类上要加上@Service标注以用于SpringBoot框架识别

package com.itbu.study.serviceimpl;

import com.itbu.study.common.bean.UserBean;
import com.itbu.study.mapper.UserMapper;
import com.itbu.study.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;

    @Override
    public List<UserBean> getAll() {
        return userMapper.getAll();
    }
}

6. 配置web模块

接下来就到了核心部分，也就是与不分模块配置差异较大的部分。Web层需要配置启动类以及配置文件，内容较多，配置步骤如下：

配置pom.xml文件

Web层将直接引用Service层的各个接口，Common模块的各个类，这里我们直接加上依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.itbu.study</groupId>
    <artifactId>serviceimpl</artifactId>
    <version>1.0.0</version>
    <name>serviceimpl</name>
    <description>Demo project for Spring Boot</description>
    <packaging>jar</packaging>
    <parent>
        <artifactId>study</artifactId>
        <groupId>com.itbu</groupId>
        <version>1.0.0</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.1.17.RELEASE</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.itbu.study</groupId>
            <artifactId>common</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>com.itbu.study</groupId>
            <artifactId>service</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>com.itbu.study</groupId>
            <artifactId>mapper</artifactId>
            <version>1.0.0</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

编写各个Controller以及配置文件

先根据以下的项目结构创建对应的文件，项目结构如下：

study-web
	|----pom.xml
	|----src
		|----test
			|----java
				|----com.itbu.study.web
					|----WebApplicationTests.java  #测试类
		|----main
			|----java
				|----com.itbu.study.web
					|----WebApplication.java
					|----controller
						|----ApiController.java
         	|----resources
         		|----config
         			|----application.yml
         			|----application-dev.yml

编写启动类，记得加上MapperScan

WebApplication.java

package com.itbu.study.web;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication(scanBasePackages = {"com.itbu.study.*"})
@MapperScan("com.itbu.study.mapper")
public class WebApplication {
    public static void main(String[] args) {
        SpringApplication.run(WebApplication.class, args);
    }
}

编写Controller层

ApiController.java

package com.itbu.study.web.controller;

import com.itbu.study.common.bean.UserBean;
import com.itbu.study.common.result.JsonResult;
import com.itbu.study.service.UserService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.xml.ws.RequestWrapper;
import java.util.List;

@RestController
@RequestMapping("/api")
public class ApiController {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());
    public ApiController(UserService userService){
        this.userService = userService;
    }
    private final UserService userService;
    @RequestMapping("/index")
    public List<UserBean> index(){
        return userService.getAll();
    }
}

在配置文件中设置数据源和mapper映射文件以及监听端口

application-dev.xml

server:
  port: 10000
mybatis:
  mapper-locations: classpath*:mapper/*.xml  #注意此处与未分模块的区别
spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://192.168.28.88:10090/mqtt?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver

7. 测试

至此，我们以及配置完了一个多模块的MQTT后端基本项目，接下来进行简单测试

运行项目并在浏览器中输入http://localhost:10000/api/index, 返回以下结果表明测试成功

在这里插入图片描述

4. 配置MQTT模块

前面我们完成了SpringBoot基础项目的配置，接下来我们将mqtt也做成模块，步骤如下：

配置pom.xml文件

我们集成mqtt功能主要使用了spring-integration-mqtt这个jar包，所以我们在pom中添加对这个包的依赖，pom.xml文件如下：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>study</artifactId>
        <groupId>com.itbu</groupId>
        <version>1.0.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.itbu.study</groupId>
    <artifactId>mqtt</artifactId>
    <packaging>jar</packaging>
    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-integration</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-stream</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-mqtt</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

在study-web的配置文件中添加如下配置：

mqtt:
  enabled: true
  username: root
  password: 123456
  url: tcp://192.168.28.88:15005
  producer:
    clientId: server
    defaultTopic: default
  consumer:
    clientId: client
    defaultTopic: default

编写MQTT各个配置类以及方法

项目结构如下：

study-mqtt
	|----pom.xml
	|----src
		|----test
		|----main
			|----resources
			|----java
				|----com.itbu.study.mqtt
					|----MqttBaseConfig.java
					|----MqttInConfig.java
					|----MqttOutConfig.java
					|----MqttMessageReceiver.java
					|----MqttMessageSender.java

MqttBaseConfig.java

package com.itbu.study.mqtt;

import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory;
import org.springframework.integration.mqtt.core.MqttPahoClientFactory;

@Configuration
@ConditionalOnProperty(value = "mqtt.enabled", havingValue = "true")
public class MqttBaseConfig {
    @Value("${mqtt.url:#{null}}")
    private String[] url;

    @Value("${mqtt.username:}")
    private String username;

    @Value("${mqtt.password:}")
    private String password;

    @Bean
    public MqttPahoClientFactory factory(){
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        MqttConnectOptions options = new MqttConnectOptions();
        if(username != null)
            options.setUserName(username);
        if(password != null)
            options.setPassword(password.toCharArray());
        options.setServerURIs(url);
        factory.setConnectionOptions(options);
        return factory;
    }
}

MqttInConfig.java

package com.itbu.study.mqtt;

import com.itbu.study.mqtt.MqttMessageReceiver;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.core.MessageProducer;
import org.springframework.integration.mqtt.core.MqttPahoClientFactory;
import org.springframework.integration.mqtt.inbound.MqttPahoMessageDrivenChannelAdapter;
import org.springframework.integration.mqtt.support.DefaultPahoMessageConverter;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;

@Configuration
@ConditionalOnProperty(value = "mqtt.enabled", havingValue = "true")
public class MqttInConfig {

    private final MqttMessageReceiver mqttMessageReceiver;

    public MqttInConfig(MqttMessageReceiver mqttMessageReceiver){
        this.mqttMessageReceiver = mqttMessageReceiver;
    }

    @Value("${mqtt.producer.clientId:")
    private String clientId;

    @Value("${mqtt.producer.defaultTopic}")
    private String topic;

    @Bean
    public MessageChannel mqttInputChannel(){
        return new DirectChannel();
    }

    @Bean
    public MessageProducer channelInbound(MessageChannel mqttInputChannel, MqttPahoClientFactory factory){
        MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(clientId, factory, topic);
        adapter.setCompletionTimeout(5000);
        adapter.setConverter(new DefaultPahoMessageConverter());
        adapter.setQos(2);
        adapter.setOutputChannel(mqttInputChannel);
        return adapter;
    }

    @Bean
    @ServiceActivator(inputChannel = "mqttInputChannel")
    public MessageHandler mqttMessageHandler(){
        return this.mqttMessageReceiver;
    }
}

MqttOutConfig.java

package com.itbu.study.mqtt;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.mqtt.core.MqttPahoClientFactory;
import org.springframework.integration.mqtt.outbound.MqttPahoMessageHandler;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;

@Configuration
@ConditionalOnProperty(value = "mqtt.enabled", havingValue = "true")
public class MqttOutConfig {
    @Value("${mqtt.consumer.clientId:}")
    private String clientId;

    @Value("${mqtt.consumer.defaultTopic}")
    private String topic;

    @Bean
    public MessageChannel mqttOutputChannel(){
        return new DirectChannel();
    }

    @Bean
    @ServiceActivator(inputChannel = "mqttOutputChannel")
    public MessageHandler mqttOutBound(MqttPahoClientFactory factory){
        MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(clientId, factory);
        messageHandler.setAsync(true);
        messageHandler.setDefaultQos(2);
        messageHandler.setDefaultTopic(topic);
        return messageHandler;
    }
}

MqttMessageReceiver.java

package com.itbu.study.mqtt;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.integration.mqtt.support.MqttHeaders;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;
import org.springframework.stereotype.Component;

@Component
@ConditionalOnProperty(value = "mqtt.enabled",havingValue = "true")
public class MqttMessageReceiver implements MessageHandler {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    @Override
    public void handleMessage(Message<?> message) throws MessagingException {
        String topic = String.valueOf(message.getHeaders().get(MqttHeaders.RECEIVED_TOPIC));
        String payload = String.valueOf(message.getPayload());
        logger.info("接收到 mqtt消息， 主题：{} 消息:{}", topic, payload);
    }
}

MqttMessageSender.java

package com.itbu.study.mqtt;

import org.springframework.integration.annotation.MessagingGateway;
import org.springframework.integration.mqtt.support.MqttHeaders;
import org.springframework.messaging.handler.annotation.Header;
import org.springframework.stereotype.Component;

@MessagingGateway(defaultRequestChannel = "mqttOutputChannel")
@Component
public interface MqttMessageSender {
    void sendToMqtt(String data);
    void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, String payload);
    void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, @Header(MqttHeaders.QOS) int qos, String payload);
}

在启动类中添加@IntegrationComponentScan注解

package com.itbu.study.web;


import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.integration.annotation.IntegrationComponentScan;

@SpringBootApplication(scanBasePackages = {"com.itbu.study.*","com.itbu.study.mqtt"})
@MapperScan("com.itbu.study.mapper")
@IntegrationComponentScan(basePackages = "com.itbu.study.mqtt") //这里添加，不然无法自动注入
public class WebApplication {
    public static void main(String[] args) {
        SpringApplication.run(WebApplication.class, args);
    }
}

编写对应Controller，我这里直接在ApiController上修改了

package com.itbu.study.web.controller;

import com.itbu.study.common.bean.UserBean;
import com.itbu.study.common.result.JsonResult;
import com.itbu.study.mqtt.MqttMessageSender;
import com.itbu.study.service.UserService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.xml.ws.RequestWrapper;
import java.util.List;

@RestController
@RequestMapping("/api")
public class ApiController {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    private final MqttMessageSender mqttMessageSender;

    public ApiController(MqttMessageSender mqttMessageSender, UserService userService){
        this.mqttMessageSender = mqttMessageSender;
        this.userService = userService;
    }

    private final UserService userService;

    @RequestMapping("/index")
    public List<UserBean> index(){
        return userService.getAll();
    }

    @RequestMapping("/mqtt")
    public JsonResult<?> mqtt_sender(@RequestParam("msg")String msg){
        logger.info("Send mqtt msg: {}", msg);
        mqttMessageSender.sendToMqtt(msg);
        logger.info("Send successfully!");
        return new JsonResult<>(0,"Send Successfully");
    }

}

测试

首先我们运行后端项目，可以看到日志打出以下输出，说明后端项目正常启动

在这里插入图片描述