update 优化 完善kafka-stream案例

ruoyi-example/ruoyi-test-mq/src/main/java/org/dromara/stream/config/KafkaStreamsConfig.java

@@ -0,0 +1,27 @@
+package org.dromara.stream.config;
+
+import org.apache.kafka.streams.StreamsBuilder;
+import org.apache.kafka.streams.kstream.KStream;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * kafka stream 配置
+ *
+ * @author LionLi
+ */
+@Configuration
+public class KafkaStreamsConfig {
+
+    @Bean
+    public KStream<String, String> demoStream(StreamsBuilder builder) {
+        // 输入主题
+        KStream<String, String> source = builder.stream("input-topic");
+        // 转换逻辑：这里只是简单地将消息转换为大写
+        KStream<String, String> processed = source.mapValues(value -> value.toUpperCase());
+        // 输出到另一个主题
+        processed.to("output-topic");
+        return source;
+    }
+
+}