Fix for encoding issue with MvcUriComponentsBuilder

Provide method for stronger encoding of expanded URI variables when
building links from views.

Issue: SPR-17027

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

@@ -402,6 +402,20 @@ public class MvcUriComponentsBuilderTests {
 		assertEquals("http://example.org:9999/base/people/123/addresses/DE", url);
 	}
 
+	@Test // SPR-17027
+	public void fromMappingNameWithEncoding() {
+
+		initWebApplicationContext(WebConfig.class);
+
+		this.request.setServerName("example.org");
+		this.request.setServerPort(9999);
+		this.request.setContextPath("/base");
+
+		String mappingName = "PAC#getAddressesForCountry";
+		String url = fromMappingName(mappingName).arg(0, "DE;FR").encode().buildAndExpand("_+_");
+		assertEquals("/base/people/_%2B_/addresses/DE%3BFR", url);
+	}
+
 	@Test
 	public void fromControllerWithPrefix() {