Update Javadoc for HtmlUtils regarding Apache Commons Text

Closes gh-23122

Author: sbrannen

spring-web/src/main/java/org/springframework/web/util/HtmlUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -19,18 +19,19 @@
 import org.springframework.util.Assert;
 
 /**
- * Utility class for HTML escaping. Escapes and unescapes
- * based on the W3C HTML 4.01 recommendation, handling
+ * Utility class for HTML escaping.
+ *
+ * <p>Escapes and unescapes based on the W3C HTML 4.01 recommendation, handling
  * character entity references.
  *
  * <p>Reference:
  * <a href="http://www.w3.org/TR/html4/charset.html">http://www.w3.org/TR/html4/charset.html</a>
  *
- * <p>For a comprehensive set of String escaping utilities,
- * consider Apache Commons Lang and its StringEscapeUtils class.
- * We are not using that class here to avoid a runtime dependency
- * on Commons Lang just for HTML escaping. Furthermore, Spring's
- * HTML escaping is more flexible and 100% HTML 4.0 compliant.
+ * <p>For a comprehensive set of String escaping utilities, consider
+ * <a href="https://commons.apache.org/proper/commons-text/">Apache Commons Text</a>
+ * and its {@code StringEscapeUtils} class. We do not use that class here in order
+ * to avoid a runtime dependency on Commons Text just for HTML escaping. Furthermore,
+ * Spring's HTML escaping is more flexible and 100% HTML 4.0 compliant.
  *
  * @author Juergen Hoeller
  * @author Martin Kersten
@@ -48,7 +49,7 @@ public abstract class HtmlUtils {
 
 	/**
 	 * Turn special characters into HTML character references.
-	 * Handles complete character set defined in HTML 4.01 recommendation.
+	 * <p>Handles complete character set defined in HTML 4.01 recommendation.
 	 * <p>Escapes all special characters to their corresponding
 	 * entity reference (e.g. {@code &lt;}).
 	 * <p>Reference:
@@ -64,7 +65,7 @@ public static String htmlEscape(String input) {
 
 	/**
 	 * Turn special characters into HTML character references.
-	 * Handles complete character set defined in HTML 4.01 recommendation.
+	 * <p>Handles complete character set defined in HTML 4.01 recommendation.
 	 * <p>Escapes all special characters to their corresponding
 	 * entity reference (e.g. {@code &lt;}) at least as required by the
 	 * specified encoding. In other words, if a special character does
@@ -97,7 +98,7 @@ public static String htmlEscape(String input, String encoding) {
 
 	/**
 	 * Turn special characters into HTML character references.
-	 * Handles complete character set defined in HTML 4.01 recommendation.
+	 * <p>Handles complete character set defined in HTML 4.01 recommendation.
 	 * <p>Escapes all special characters to their corresponding numeric
 	 * reference in decimal format (&#<i>Decimal</i>;).
 	 * <p>Reference:
@@ -113,7 +114,7 @@ public static String htmlEscapeDecimal(String input) {
 
 	/**
 	 * Turn special characters into HTML character references.
-	 * Handles complete character set defined in HTML 4.01 recommendation.
+	 * <p>Handles complete character set defined in HTML 4.01 recommendation.
 	 * <p>Escapes all special characters to their corresponding numeric
 	 * reference in decimal format (&#<i>Decimal</i>;) at least as required by the
 	 * specified encoding. In other words, if a special character does
@@ -147,7 +148,7 @@ public static String htmlEscapeDecimal(String input, String encoding) {
 
 	/**
 	 * Turn special characters into HTML character references.
-	 * Handles complete character set defined in HTML 4.01 recommendation.
+	 * <p>Handles complete character set defined in HTML 4.01 recommendation.
 	 * <p>Escapes all special characters to their corresponding numeric
 	 * reference in hex format (&#x<i>Hex</i>;).
 	 * <p>Reference:
@@ -163,7 +164,7 @@ public static String htmlEscapeHex(String input) {
 
 	/**
 	 * Turn special characters into HTML character references.
-	 * Handles complete character set defined in HTML 4.01 recommendation.
+	 * <p>Handles complete character set defined in HTML 4.01 recommendation.
 	 * <p>Escapes all special characters to their corresponding numeric
 	 * reference in hex format (&#x<i>Hex</i>;) at least as required by the
 	 * specified encoding. In other words, if a special character does
@@ -205,8 +206,8 @@ public static String htmlEscapeHex(String input, String encoding) {
 	 * &amp;#<i>Decimal</i>; - <i>(Example: &amp;#68;)</i><br>
 	 * &amp;#x<i>Hex</i>; - <i>(Example: &amp;#xE5;) case insensitive</i><br>
 	 * </blockquote>
-	 * Gracefully handles malformed character references by copying original
-	 * characters as is when encountered.<p>
+	 * <p>Gracefully handles malformed character references by copying original
+	 * characters as is when encountered.
 	 * <p>Reference:
 	 * <a href="http://www.w3.org/TR/html4/sgml/entities.html">
 	 * http://www.w3.org/TR/html4/sgml/entities.html