Introduce alias for 'value' attribute in @RequestPart

Issue: SPR-11393

spring-web/src/main/java/org/springframework/web/bind/annotation/RequestPart.java

 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.core.annotation.AliasFor;
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.web.multipart.MultipartFile;
@@ -30,7 +31,9 @@ import org.springframework.web.multipart.MultipartResolver;
 
 /**
  * Annotation that can be used to associate the part of a "multipart/form-data" request
- * with a method argument. Supported method argument types include {@link MultipartFile}
+ * with a method argument.
+ *
+ * <p>Supported method argument types include {@link MultipartFile}
  * in conjunction with Spring's {@link MultipartResolver} abstraction,
  * {@code javax.servlet.http.Part} in conjunction with Servlet 3.0 multipart requests,
  * or otherwise for any other method argument, the content of the part is passed through an
@@ -50,6 +53,7 @@ import org.springframework.web.multipart.MultipartResolver;
  *
  * @author Rossen Stoyanchev
  * @author Arjen Poutsma
+ * @author Sam Brannen
  * @since 3.1
  *
  * @see RequestParam
@@ -61,15 +65,23 @@ import org.springframework.web.multipart.MultipartResolver;
 public @interface RequestPart {
 
 	/**
-	 * The name of the part in the "multipart/form-data" request to bind to.
+	 * Alias for {@link #name}.
 	 */
+	@AliasFor(attribute = "name")
 	String value() default "";
 
+	/**
+	 * The name of the part in the "multipart/form-data" request to bind to.
+	 * @since 4.2
+	 */
+	@AliasFor(attribute = "value")
+	String name() default "";
+
 	/**
 	 * Whether the part is required.
-	 * <p>Default is {@code true}, leading to an exception thrown in case
-	 * of the part missing in the request. Switch this to {@code false}
-	 * if you prefer a {@code null} in case of the part missing.
+	 * <p>Default is {@code true}, leading to an exception being thrown
+	 * in case the part is missing in the request. Switch this to
+	 * {@code false} if you prefer a {@code null} if the part is missing.
 	 */
 	boolean required() default true;
 

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestPartMethodArgumentResolver.java

@@ -188,8 +188,8 @@ public class RequestPartMethodArgumentResolver extends AbstractMessageConverterM
 			}
 		}
 
-		RequestPart ann = parameter.getParameterAnnotation(RequestPart.class);
-		boolean isRequired = ((ann == null || ann.required()) && !optional);
+		RequestPart requestPart = parameter.getParameterAnnotation(RequestPart.class);
+		boolean isRequired = ((requestPart == null || requestPart.required()) && !optional);
 
 		if (arg == null && isRequired) {
 			throw new MissingServletRequestPartException(partName);
@@ -209,8 +209,8 @@ public class RequestPartMethodArgumentResolver extends AbstractMessageConverterM
 	}
 
 	private String getPartName(MethodParameter methodParam) {
-		RequestPart ann = methodParam.getParameterAnnotation(RequestPart.class);
-		String partName = (ann != null ? ann.value() : "");
+		RequestPart requestPart = methodParam.getParameterAnnotation(RequestPart.class);
+		String partName = (requestPart != null ? requestPart.name() : "");
 		if (partName.length() == 0) {
 			partName = methodParam.getParameterName();
 			if (partName == null) {

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/RequestPartIntegrationTests.java

@@ -179,14 +179,13 @@ public class RequestPartIntegrationTests {
 		}
 	}
 
-	@SuppressWarnings("unused")
 	@Controller
 	private static class RequestPartTestController {
 
 		@RequestMapping(value = "/test", method = RequestMethod.POST, consumes = { "multipart/mixed", "multipart/form-data" })
-		public ResponseEntity<Object> create(@RequestPart("json-data") TestData testData,
+		public ResponseEntity<Object> create(@RequestPart(name = "json-data") TestData testData,
 				@RequestPart("file-data") MultipartFile file,
-				@RequestPart(value = "empty-data", required = false) TestData emptyData) {
+				@RequestPart(name = "empty-data", required = false) TestData emptyData) {
 
 			String url = "http://localhost:8080/test/" + testData.getName() + "/" + file.getOriginalFilename();
 			HttpHeaders headers = new HttpHeaders();