stringutil.java

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package com.v512.guestbook;

public class StringUtil {
	public static boolean validateNull(String args) {
		if (args == null || args.length() == 0) {
			return true;
		} else {
			return false;
		}
	}

	
	public static String chanageNull(String source, String target) {
		if (source == null || source.length() == 0 || source.equalsIgnoreCase("null")) {
			return target;
		} else {
			return source;
		}
	}

	
	public static String filterHtml(String input) {
		if (input == null) {
			return null;
		}
		if (input.length() == 0) {
			return input;
		}
		input = input.replaceAll("&", "&");
		input = input.replaceAll("<", "&lt;");
		input = input.replaceAll(">", "&gt;");
		input = input.replaceAll(" ", "&nbsp;");
		input = input.replaceAll("'", "&#39;");
		input = input.replaceAll("\"", "&quot;");
		return input.replaceAll("\n", "<br>");
	}
}