HttpServletRequest request 获取当前路径

获取当前路径 ：
HttpServletRequest request = ServletActionContext.getRequest();
String path_str = request.getServletPath();
 String param_str=request.getQueryString();
if(request.getQueryString() != null){
      path_str+= "?"+ param_str;
 }
ActionContext.getContext().put("last_url", URLEncoder.encode(path_str,"UTF-8"));
在取last_url 的时候
last_url = java.net.URLDecoder.decode(last_url, "UTF-8");