HtmlSpecialChars.java

public static String convertHtmlSpecialChars(String source) {

		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < source.length(); i++) {
			char c = source.charAt(i);
			switch (c) {
			case '<':
				sb.append("&lt;");
				break;
			case '>':
				sb.append("&gt;");
				break;
			case '&':
				sb.append("&amp;");
				break;
			case '"':
				sb.append("&quot;");
				break;
			case '\'':
				sb.append("&apos;");
				break;
			default:
				sb.append(c);
			}
		}

		return sb.toString();
	}