Spring boot Spring Cloud Kafka活页夹转换错误（消费者）

我构建了一个SpringBoot应用程序，使用SpringCloudStream、SpringKafka等依赖项访问kafka。目前，我正在尝试从Topic访问数据到我的consumer类，但出现以下错误

Caused by: java.lang.IllegalArgumentException: This converter can only convert byte[] to String
    at org.springframework.util.Assert.isTrue(Assert.java:121) ~[spring-core-5.2.9.RELEASE.jar:5.2.9.RELEASE]

我使用producer成功地将数据插入主题，命令行kafka consumer显示如下所示的数据

Comment [content=kkklskjdflsjdf, author=kkkkk]

import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.cloud.stream.messaging.Sink;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.stereotype.Service;

import com.ust.kafkaspringstream.springstream.Service.IConsumer;
import com.ust.kafkaspringstream.springstream.model.Comment;

@Service
@EnableBinding(Sink.class)
public class Consumer implements IConsumer{
    @StreamListener(target = Sink.INPUT)
    public void handle(@Payload Comment comment) {
        System.out.println(comment.getContent());
    }
}

下面是我用来将数据推入主题的代码

        Comment comment = new Comment();
        comment.setAuthor("kkkkk");
        comment.setContent("kkklskjdflsjdf");
        producer.getMySource()
            .output()
            .send(MessageBuilder.withPayload(comment)
                    .setHeader("type", "chat")
                    .build());

下面给出了我的消费者分类

Comment [content=kkklskjdflsjdf, author=kkkkk]

import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.cloud.stream.messaging.Sink;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.stereotype.Service;

import com.ust.kafkaspringstream.springstream.Service.IConsumer;
import com.ust.kafkaspringstream.springstream.model.Comment;

@Service
@EnableBinding(Sink.class)
public class Consumer implements IConsumer{
    @StreamListener(target = Sink.INPUT)
    public void handle(@Payload Comment comment) {
        System.out.println(comment.getContent());
    }
}

我的财产列在下面

spring.cloud.stream.default-binder=kstream
spring.cloud.stream.kafka.binder.brokers=localhost:9092
spring.cloud.stream.bindings.input.binder=kafka
spring.cloud.stream.bindings.input.destination=wtTopic
spring.cloud.stream.bindings.input.content-type=text/plain
spring.cloud.stream.bindings.input.group=input-group-1
spring.cloud.stream.bindings.output.binder=kafka
spring.cloud.stream.bindings.output.destination=wtTopic
spring.cloud.stream.bindings.output.content-type=text/plain
spring.cloud.stream.bindings.output.group=output-group-1

---

我只需要将我的消息转换回我用于将数据推送到主题中的相同pojo，在SpringCloudStream和SpringBoot应用程序中有什么方法可以做到这一点吗？我正在使用spring boot 2.3.4版

对于输入和输出内容类型，您应该使用内容类型application/json而不是text/plain（或者迁移到AVRO以获得更好的性能）。另外，你能和我们分享你的Spring POM依赖项吗？最后，我认为制作人不能有一个群组，因为群组只用于消费。