Struts2 ACTION中重定向

@Override
public String list() throws Exception {
    HttpServletRequest request = ServletActionContext.getRequest();
    String loginName = request.getParameter("j_username");
    String password = request.getParameter("j_password");
    HttpSession session = request.getSession();
    session.setAttribute("username", loginName);
    session.setAttribute("password", password);
        //你要转向的页面的地址.

    String url = new String( ("../j_spring_security_check?j_username="
        +java.net.URLEncoder.encode(loginName)
        +"&j_password="+password).getBytes("UTF-8"),"ISO8859_1");


    //你要转向的页面的地址.
    HttpServletResponse response = ServletActionContext.getResponse();
    response.sendRedirect(url);
    //重定向后,别忘了返回null值,而不能再返回return    


    //mapping.findForward("****");      
    return null;
    //return SUCCESS;            

}