MimeTypeUtils trims parameter names / values

Issue: SPR-16630

spring-core/src/main/java/org/springframework/util/MimeTypeUtils.java

@@ -225,8 +225,8 @@ public abstract class MimeTypeUtils {
 				}
 				int eqIndex = parameter.indexOf('=');
 				if (eqIndex >= 0) {
-					String attribute = parameter.substring(0, eqIndex);
-					String value = parameter.substring(eqIndex + 1, parameter.length());
+					String attribute = parameter.substring(0, eqIndex).trim();
+					String value = parameter.substring(eqIndex + 1, parameter.length()).trim();
 					parameters.put(attribute, value);
 				}
 			}

spring-core/src/test/java/org/springframework/util/MimeTypeTests.java

@@ -247,6 +247,18 @@ public class MimeTypeTests {
 		assertEquals("'v>alue'", mimeType.getParameter("attr"));
 	}
 
+	@Test // SPR-16630
+	public void parseMimeTypeWithSpacesAroundEquals() {
+		MimeType mimeType = MimeTypeUtils.parseMimeType("multipart/x-mixed-replace;boundary = --myboundary");
+		assertEquals("--myboundary", mimeType.getParameter("boundary"));
+	}
+
+	@Test // SPR-16630
+	public void parseMimeTypeWithSpacesAroundEqualsAndQuotedValue() {
+		MimeType mimeType = MimeTypeUtils.parseMimeType("text/plain; foo = \" bar \" ");
+		assertEquals("\" bar \"", mimeType.getParameter("foo"));
+	}
+
 	@Test(expected = InvalidMimeTypeException.class)
 	public void parseMimeTypeIllegalQuotedParameterValue() {
 		MimeTypeUtils.parseMimeType("audio/*;attr=\"");