public static void remember(HttpServletRequest request,
			    HttpServletResponse response, String logonName, String logonPwd) {
    //创建2个Cookie分别存放登录名和密码
    //如果logonName中存在中文，此时response中不能存放，将logonName转换成二进制的形式
    //对中文进行编码
    try {
	logonName = URLEncoder. encode(logonName, "UTF-8");
    } catch (UnsupportedEncodingException e) {
	e.printStackTrace();
    }
    Cookie nameCookie = new Cookie( "name",logonName);
    Cookie passwordCookie = new Cookie( "password",logonPwd);
    //设置Cookie的有效路径（项目的绝对路径）
    nameCookie.setPath(request.getContextPath()+ "/");
    passwordCookie.setPath(request.getContextPath()+ "/");
    //设置Cookie的有效时长（1个星期），用页面的复选框进行判断是否需要设置
    String remeberMe = request.getParameter( "remeberMe");
    //如果选择复选框（设置有效时长为1个星期）
    if(remeberMe!= null && remeberMe.equals( "yes")){
	nameCookie.setMaxAge(7*24*60*60);
	passwordCookie.setMaxAge(7*24*60*60);
    }
    //没有选择复选框（清空有效时长）
    else{
	nameCookie.setMaxAge(0);
	passwordCookie.setMaxAge(0);
    }
    //将2个Cookie放置到response对象中
    response.addCookie(nameCookie);
    response.addCookie(passwordCookie);
}

}

String path=request.getServletPath();

private void forwardIndexPage (String path, HttpServletRequest request) {
    //表示跳转到的是，首页的index.jsp
    if(path!= null && path.equals( "/index.jsp")){
	String name = "";
	String password = "";
	String checked = "";
	Cookie [] cookies = request.getCookies();
	if(cookies!= null && cookies. length>0){
	    for(Cookie cookie:cookies){
		if(cookie.getName().equals( "name")){
		    name = cookie.getValue();
		    //如果name存在中文的二进制，需要将二进制的格式转换成中文
		    try {
			name = URLDecoder. decode(name, "UTF-8");
		    } catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		    }
		    checked = "checked";
		}
		if(cookie.getName().equals( "password")){
		    password = cookie.getValue();
		}
	    }
	}
	request.setAttribute( "name", name);
	request.setAttribute( "password", password);
	request.setAttribute( "checked", checked);
    }
}