filter修改请求参数

public class SpecialCharacterFilter  {
	protected Log log = LogFactory.getLog(getClass());

	@Override
	protected void doFilterInternal(HttpServletRequest req,
			HttpServletResponse res, FilterChain chain)
			throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		Map map = req.getParameterMap();
		Set set = map.entrySet();
		if (map != null) {
			for (Iterator it = set.iterator(); it.hasNext();) {
				Map.Entry entry = (Entry) it.next();
				if (entry.getValue() instanceof String[]) {
					String[] values = (String[]) entry.getValue();
					for (int i = 0; i < values.length; i++) {
						//html特殊字符转义
						//values[i] = HtmlUtils.htmlEscape(values[i]);
						
						//Sql转义
						values[i]=StringEscapeUtils.escapeSql(values[i]);
						
						//javascript特殊字符转义
						//values[i] = JavaScriptUtils.javaScriptEscape(values[i]);
						
						entry.setValue(values);
					}
				}
			}
			chain.doFilter(req, res);
		}
	}
}