基于springboot设计能接入 http mqtt coap协议，并能把接受到的数据JSON格式化的物联网平台，写出示范代码，包含依赖项，import语句

以下是一个基于Spring Boot设计的可以接入http, mqtt, coap协议的物联网平台示范代码，包含依赖项和import语句：

依赖项：

<dependencies>
    <!-- Spring Boot Web Starter -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <!-- Eclipse Paho - MQTT Client -->
    <dependency>
        <groupId>org.eclipse.paho</groupId>
        <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
        <version>1.2.5</version>
    </dependency>

    <!-- Californium - CoAP Framework -->
    <dependency>
        <groupId>org.eclipse.californium</groupId>
        <artifactId>californium-core</artifactId>
        <version>2.0.0-M7</version>
    </dependency>

    <!-- JSON Processing API -->
    <dependency>
        <groupId>javax.json</groupId>
        <artifactId>javax.json-api</artifactId>
        <version>1.1.4</version>
    </dependency>

    <!-- Reference Implementation for JSON Processing -->
    <dependency>
        <groupId>org.glassfish</groupId>
        <artifactId>javax.json</artifactId>
        <version>1.1.4</version>
    </dependency>
</dependencies>

import语句：

import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonReader;

import org.eclipse.californium.core.CoapClient;
import org.eclipse.californium.core.CoapResponse;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessagingException;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.simp.SimpMessagingTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

完整代码如下：

SpringBootMqttCoapIotPlatformApplication.java

@Configuration
@RestController
public class SpringBootMqttCoapIotPlatformApplication {

    @Autowired
    private SimpMessagingTemplate messagingTemplate;

    @PostMapping("/http")
    public ResponseEntity<String> handleHttpPostRequest(@RequestBody String requestBody) {
        JsonObject json = readJsonObject(requestBody);
        String message = json.getString("message");
        messagingTemplate.convertAndSend("/topic/http", message);
        return new ResponseEntity<>("Message sent to HTTP topic", HttpStatus.OK);
    }

    @MessageMapping("/mqtt")
    public void handleMqttMessage(String message) throws MqttException {
        MqttClient client = new MqttClient("tcp://localhost:1883", MqttClient.generateClientId());
        client.connect();
        MqttMessage mqttMessage = new MqttMessage();
        mqttMessage.setPayload(message.getBytes());
        client.publish("mqtt", mqttMessage);
        client.disconnect();
    }

    @ServiceActivator(inputChannel = "coapChannel")
    public void handleCoapMessage(Message<?> message) {
        CoapClient client = new CoapClient("coap://localhost:5683/iotsensors");
        CoapResponse response = client.post(message.getPayload().toString(), 0);
        String responseBody = response.getResponseText();
        messagingTemplate.convertAndSend("/topic/coap", responseBody);
    }

    @GetMapping("/coap/{payload}")
    public ResponseEntity<String> handleHttpGetRequest(@PathVariable String payload) {
        CoapClient client = new CoapClient("coap://localhost:5683/iotsensors");
        CoapResponse response = client.post(payload, 0);
        return new ResponseEntity<>(response.getResponseText(), HttpStatus.OK);
    }

    @Bean
    public CoapInboundGateway coapInboundGateway() {
        CoapInboundGateway coapInboundGateway = new CoapInboundGateway("/iotsensors");
        coapInboundGateway.setRequestChannel(coapChannel());
        return coapInboundGateway;
    }

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

    private JsonObject readJsonObject(String json) {
        JsonReader reader = Json.createReader(new StringReader(json));
        return reader.readObject();
    }

    public static void main(String[] args) {
        SpringApplication.run(SpringBootMqttCoapIotPlatformApplication.class, args);
    }
}

CoapInboundGateway.java

public class CoapInboundGateway extends AbstractInboundGateway {

    private CoapServer coapServer;
    private String uri;

    public CoapInboundGateway(String uri) {
        this.coapServer = new CoapServer();
        this.uri = uri;
    }

    public void setRequestChannel(MessageChannel requestChannel) {
        super.setRequestChannel(requestChannel);
    }

    public void start() {
        coapServer.add(new CoapResource(uri) {
            @Override
            public void handlePOST(CoapExchange exchange) {
                Message<?> message = createMessage(exchange.getRequestText());
                if (message != null) {
                    send(message);
                }
            }
        });
        coapServer.start();
    }

    public void stop() {
        coapServer.stop();
    }

    private Message<?> createMessage(String payload) {
        if (!StringUtils.isEmpty(payload)) {
            return getMessageBuilderFactory().withPayload(payload).build();
        }
        return null;
    }
}

application.properties

spring.application.name=Spring Boot IoT Platform
spring.main.banner-mode=off

server.port=8080

CoapConfiguration.java

@Configuration
public class CoapConfiguration {

    @Autowired
    private CoapInboundGateway coapInboundGateway;

    @Bean
    public CoapEndpoint coapEndpoint() {
        return new CoapEndpoint(5683);
    }

    @Bean
    public CoapServer coapServer() {
        CoapServer coapServer = new CoapServer();
        coapServer.addEndpoint(coapEndpoint());
        coapServer.add(coapInboundGateway);
        coapServer.start();
        return coapServer;
    }

    @PreDestroy
    public void stopCoapServer() {
        coapServer().stop();
    }
}

注意：示范代码只是演示如何使用Spring Boot设计物联网平台，示例代码中的MQTT和CoAP服务器均为本地服务器，并且没有进行安全验证。在实际应用中，需要根据实际需求做出相应的配置和修改。