防止SQL注入和跨站脚本攻击

public class SecurityCommLocalUtil {

	// 防范跨站脚本攻击应该检查以下特殊字符
	public static String checkHtmlEncode(String sText) {

		if (null == sText || sText.length() < 1)
			return "";

		sText = sText.replaceAll("&", "&");
		sText = sText.replaceAll("#", "＃");
		sText = sText.replaceAll("’", ""e;");
		sText = sText.replaceAll("\"", ""e;");
		sText = sText.replaceAll("<", "<");
		sText = sText.replaceAll(">", ">");

		return sText;
	}

	/**
	 * 根据传入参数进行SQL注入处理
	 * 
	 * @param param
	 *            需要过滤的字符串
	 * @return 字符串
	 */
	public static String checkSQLImmit(String param) {
		if (null != param && param.length() > 0) {
			String[] checkstrLower = new String[] { "select ", "and ", "or ",
					"update ", "delete ", "insert ", " sysibm", ";", " dual",
					" declare", "/*", " systables", "length ", " substr", "'", "<",
					">", "`" };

			String[] checkstrUpper = new String[] { "SELECT ", "AND ", "OR ",
					"UPDATE ", "DELETE ", "INSERT ", " SYSIBM", ";", " DUAL",
					" DECLARE", "/*", " SYSTABLES", "LENGTH ", " SUBSTR", "'", "<",
					">", "`" };

			for (String check : checkstrLower) {
				if (param.indexOf(check) != -1) {
					Pattern p = Pattern
							.compile(check, Pattern.CASE_INSENSITIVE);
					param = p.matcher(param).replaceAll(" ");
				}
			}
			for (String check : checkstrUpper) {
				if (param.indexOf(check) != -1) {
					Pattern p = Pattern
							.compile(check, Pattern.CASE_INSENSITIVE);
					param = p.matcher(param).replaceAll(" ");
				}
			}

		}

		return param;
	}
}

在jsp页面中用该方法包裹request.getAttribute()