BAEL-3559: Added purpose-built endpoint for testing multipart uploads with HttpClient.

spring-mvc-java/src/main/java/com/baeldung/web/controller/MultipartFileUploadStubController.java

@@ -0,0 +1,33 @@
+package com.baeldung.web.controller;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.multipart.MultipartFile;
+
+@Controller
+public class MultipartFileUploadStubController {
+    
+    private static final Logger logger = LoggerFactory.getLogger(MultipartFileUploadStubController.class);
+
+    @PostMapping("/stub/multipart")
+    @ResponseStatus(HttpStatus.OK)
+    public void uploadFile(MultipartFile file, String text, String text1, String text2, MultipartFile upstream) {
+        logger.info("Uploaded file: " + format(file));
+        logger.info("  - text: [" + format(text) + "]");
+        logger.info("  - text1: [" + format(text1) + "]");
+        logger.info("  - text2: [" + format(text2) + "]");
+        logger.info("  - upstream: [" + format(upstream) + "]");
+    }
+    
+    private static String format(MultipartFile file) {
+        return file == null ? "<null>" : file.getOriginalFilename() + " (size: " + file.getSize() + " bytes)";
+    }
+    
+    private static String format(String str) {
+        return str == null ? "<null>" : str;
+    }
+}