使用Spring Boot集成RocketMQ进行消息发送的示例

import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class RocketMQProducerController {
 
    private final DefaultMQProducer producer;
 
    @Autowired
    public RocketMQProducerController(DefaultMQProducer producer) {
        this.producer = producer;
    }
 
    @GetMapping("/sendMessage")
    public String sendMessage(@RequestParam String topic, @RequestParam String message) {
        try {
            Message msg = new Message(topic, "TagA", message.getBytes(RemotingHelper.DEFAULT_CHARSET));
            SendResult sendResult = producer.send(msg);
            return "Message is sent. Result: " + sendResult.getSendStatus();
        } catch (Exception e) {
            e.printStackTrace();
            return "Failed to send the message. Error: " + e.getMessage();
        }
    }
}

这段代码演示了如何在Spring Boot应用程序中使用已经配置好的RocketMQ生产者来发送消息。当访问/sendMessage路径时，通过GET请求传递的topic和message将被发送至RocketMQ服务器。发送结果会以字符串的形式返回。