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Spring Framework example source code file (HtmlUtils.java)

This example Spring Framework source code file (HtmlUtils.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

htmlcharacterentitydecoder, htmlcharacterentityreferences, htmlcharacterentityreferences, htmlutils, htmlutils, string, string, stringbuffer, stringbuffer

The Spring Framework HtmlUtils.java source code

/*
 * Copyright 2002-2007 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.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.util;

/**
 * Utility class for HTML escaping. 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
 *
 * <p>For a comprehensive set of String escaping utilities,
 * consider Jakarta 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.
 *
 * @author Juergen Hoeller
 * @author Martin Kersten
 * @since 01.03.2003
 * @see org.apache.commons.lang.StringEscapeUtils
 */
public abstract class HtmlUtils {

	/**
	 * Shared instance of pre-parsed HTML character entity references.
	 */
	private static final HtmlCharacterEntityReferences characterEntityReferences =
			new HtmlCharacterEntityReferences();


	/**
	 * Turn special characters into HTML character references.
	 * Handles complete character set defined in HTML 4.01 recommendation.
	 * <p>Escapes all special characters to their corresponding
	 * entity reference (e.g. <code><).
	 * <p>Reference:
	 * <a href="http://www.w3.org/TR/html4/sgml/entities.html">
	 * http://www.w3.org/TR/html4/sgml/entities.html
	 * </a>
	 * @param input the (unescaped) input string
	 * @return the escaped string
	 */
	public static String htmlEscape(String input) {
		if (input == null) {
			return null;
		}
		StringBuffer escaped = new StringBuffer(input.length() * 2);
		for (int i = 0; i < input.length(); i++) {
			char character = input.charAt(i);
			String reference = characterEntityReferences.convertToReference(character);
			if (reference != null) {
				escaped.append(reference);
			}
			else {
				escaped.append(character);
			}
		}
		return escaped.toString();
	}

	/**
	 * Turn special characters into HTML character references.
	 * 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;).
	 * <p>Reference:
	 * <a href="http://www.w3.org/TR/html4/sgml/entities.html">
	 * http://www.w3.org/TR/html4/sgml/entities.html
	 * </a>
	 * @param input the (unescaped) input string
	 * @return the escaped string
	 */
	public static String htmlEscapeDecimal(String input) {
		if (input == null) {
			return null;
		}
		StringBuffer escaped = new StringBuffer(input.length() * 2);
		for (int i = 0; i < input.length(); i++) {
			char character = input.charAt(i);
			if (characterEntityReferences.isMappedToReference(character)) {
				escaped.append(HtmlCharacterEntityReferences.DECIMAL_REFERENCE_START);
				escaped.append((int) character);
				escaped.append(HtmlCharacterEntityReferences.REFERENCE_END);
			}
			else {
				escaped.append(character);
			}
		}
		return escaped.toString();
	}

	/**
	 * Turn special characters into HTML character references.
	 * 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;).
	 * <p>Reference:
	 * <a href="http://www.w3.org/TR/html4/sgml/entities.html">
	 * http://www.w3.org/TR/html4/sgml/entities.html
	 * </a>
	 * @param input the (unescaped) input string
	 * @return the escaped string
	 */
	public static String htmlEscapeHex(String input) {
		if (input == null) {
			return null;
		}
		StringBuffer escaped = new StringBuffer(input.length() * 2);
		for (int i = 0; i < input.length(); i++) {
			char character = input.charAt(i);
			if (characterEntityReferences.isMappedToReference(character)) {
				escaped.append(HtmlCharacterEntityReferences.HEX_REFERENCE_START);
				escaped.append(Integer.toString((int) character, 16));
				escaped.append(HtmlCharacterEntityReferences.REFERENCE_END);
			}
			else {
				escaped.append(character);
			}
		}
		return escaped.toString();
	}

	/**
	 * Turn HTML character references into their plain text UNICODE equivalent.
	 * <p>Handles complete character set defined in HTML 4.01 recommendation
	 * and all reference types (decimal, hex, and entity).
	 * <p>Correctly converts the following formats:
	 * <blockquote>
	 * &#<i>Entity; - (Example: &amp;) case sensitive
	 * &#<i>Decimal; - (Example: &#68;)
* &#x<i>Hex; - (Example: &#xE5;) case insensitive
* </blockquote> * Gracefully handles malformed character references by copying original * characters as is when encountered.<p> * <p>Reference: * <a href="http://www.w3.org/TR/html4/sgml/entities.html"> * http://www.w3.org/TR/html4/sgml/entities.html * </a> * @param input the (escaped) input string * @return the unescaped string */ public static String htmlUnescape(String input) { if (input == null) { return null; } return new HtmlCharacterEntityDecoder(characterEntityReferences, input).decode(); } }

Other Spring Framework examples (source code examples)

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