Add Stream processing example

spring-cloud-data-flow/time-processor/src/main/java/org/baeldung/spring/cloud/TimeProcessorApplication.java

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+package org.baeldung.spring.cloud;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.stream.annotation.EnableBinding;
+import org.springframework.cloud.stream.messaging.Processor;
+import org.springframework.integration.annotation.Transformer;
+
+@EnableBinding(Processor.class)
+@SpringBootApplication
+public class TimeProcessorApplication {
+
+	@Transformer(inputChannel = Processor.INPUT, outputChannel = Processor.OUTPUT)
+	public Object transform(Long timestamp) {
+
+		DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd hh:mm:ss");
+		String date = dateFormat.format(timestamp);
+		return date;
+	}
+
+	public static void main(String[] args) {
+		SpringApplication.run(TimeProcessorApplication.class, args);
+	}
+}

spring-cloud-data-flow/time-processor/src/test/java/org/baeldung/spring/cloud/TimeProcessorApplicationTests.java

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+package org.baeldung.spring.cloud;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class TimeProcessorApplicationTests {
+
+	@Test
+	public void contextLoads() {
+	}
+
+}