kafka: 使用KafkaListener发送消息的两种方式

package cn.edu.tju.controller;

import org.apache.kafka.clients.producer.RecordMetadata;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.support.SendResult;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {
    @Autowired
    private KafkaTemplate kafkaTemplate;
    //发送即忘
    @RequestMapping("/addMessage/{info}")
    public String addMessage(@PathVariable("info")String info){
        kafkaTemplate.send("test","myKey",info);
        return info;
    }
    //同步获取发送结果
    @RequestMapping("/addMessage2/{info}")
    public String addMessage2(@PathVariable("info")String info){
        ListenableFuture> future = kafkaTemplate.send("test", "myKey2", info);
        String metaData="";
        try{
            SendResult result =future.get();
            RecordMetadata recordMetadata = result.getRecordMetadata();
            int partition = recordMetadata.partition();
            long offset = recordMetadata.offset();
            metaData += " partition: ";
            metaData += partition;
            metaData += "  offset: ";
            metaData += offset;

        }
        catch (Exception ex){
            System.out.println(ex.getMessage());
        }
        return metaData;
    }

}