SpringBoot集成mqtt的多模块项目配置详解
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
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
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。
选择保存的路径,点击Finish完成创建。
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)
至此,父项目一级已经创建完成,最后项目目录如下:
2. 搭建子项目右键项目根目录->新建->新模块
选择Maven,单击Next
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
以此类推创建整个项目,项目目录如图所示
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 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;@Servicepublic 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: 10000mybatis: 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
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')@Componentpublic 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
然后我们使用mqtt.fx这个软件往订阅主题default发送helloworld
发现日志打印如下信息,表面输入通道正常:
然后我们在浏览器中输入http://localhost:10000/api/mqtt?msg=1234556 并按下回车,浏览器显示如下:
可以看到日志中打印了如下内容:
因为我们订阅的主题也是default,所以也收到了生产者发送的信息,我们打开mqtt.fx, 订阅default主题,可以收到如下信息:
测试成功
最后放上工程的源码:GitHub
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