#BAEL-636 (#1468)

* jira #BAEL-636

* remove redundant dependency spring-boot-starter-reactive

spring-5/src/main/java/com/baeldung/functional/FormHandler.java

@@ -0,0 +1,50 @@
+package com.baeldung.functional;
+
+import org.springframework.util.MultiValueMap;
+import org.springframework.web.reactive.function.server.ServerRequest;
+import org.springframework.web.reactive.function.server.ServerResponse;
+import reactor.core.publisher.Mono;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.springframework.web.reactive.function.BodyExtractors.toDataBuffers;
+import static org.springframework.web.reactive.function.BodyExtractors.toFormData;
+import static org.springframework.web.reactive.function.BodyInserters.fromObject;
+import static org.springframework.web.reactive.function.server.ServerResponse.ok;
+
+public class FormHandler {
+
+    Mono<ServerResponse> handleLogin(ServerRequest request) {
+        return request
+          .body(toFormData())
+          .map(MultiValueMap::toSingleValueMap)
+          .map(formData -> {
+              System.out.println("form data: " + formData.toString());
+              if ("baeldung".equals(formData.get("user")) && "you_know_what_to_do".equals(formData.get("token"))) {
+                  return ok()
+                    .body(Mono.just("welcome back!"), String.class)
+                    .block();
+              }
+              return ServerResponse
+                .badRequest()
+                .build()
+                .block();
+          });
+    }
+
+    Mono<ServerResponse> handleUpload(ServerRequest request) {
+        return request
+          .body(toDataBuffers())
+          .collectList()
+          .map(dataBuffers -> {
+              AtomicLong atomicLong = new AtomicLong(0);
+              dataBuffers.forEach(d -> atomicLong.addAndGet(d
+                .asByteBuffer()
+                .array().length));
+              System.out.println("data length:" + atomicLong.get());
+              return ok()
+                .body(fromObject(atomicLong.toString()))
+                .block();
+          });
+    }
+}