me.add("/login", MembersController.class, "/pages/login");

public class MembersController extends BaseController {
  @Before(MembersValidator.class)
  @ActionKey("/login")
  public void login() {

    // 获取用户名
    String name = getPara("username");
    // 获取密码
    String password = getPara("password");

    Members mem = Members.me.getMemByNamePasswd(name, CipherUtils.generatePassword(password));

    if (mem != null) {
      // 保存session
      getSession().setAttribute("username", name);

      // 最后登录ip
      mem.set("lastip", getRequest().getRemoteHost());
      mem.set("lastvisit", DateUtils.getCurrentTime());

      mem.update();

      ajaxDoneSuccess("登录成功！");
    } else {
      ajaxDoneError("用户不存在！");
    }

    // 跳转到前台发起请求的路径
    renderJson();

  }
}

package com.hc.jf.controller;
import com.jfinal.core.Controller;
public class BaseController extends Controller {
  protected void ajaxDone(int statusCode, String message) {
    setAttr("statusCode", statusCode);
    setAttr("message", message);
    // 跳转路径
    String forwardUrl = getPara("forwardUrl");
    if (forwardUrl == null || forwardUrl.equals("")) {
      forwardUrl = getRequest().getRequestURL().toString();
    }
    setAttr("forwardUrl", forwardUrl);
    setAttr("callbackType", getPara("callbackType"));
  }
  protected void ajaxDoneSuccess(String message) {
    ajaxDone(200, message);
  }
  protected void ajaxDoneInfo(String message) {
    ajaxDone(201, message);
  }
  protected void ajaxDoneSuccess(String message, String forwarUrl) {
    ajaxDone(200, message);
  }
  protected void ajaxDoneError(String message) {
    ajaxDone(300, message);
  }
  protected void ajaxDoneError(String message, String forwarUrl) {
    ajaxDone(300, message);
  }
}

package com.hc.jf.validator;

import com.hc.jf.entity.Members;
import com.jfinal.core.Controller;
import com.jfinal.validate.Validator;

public class MembersValidator extends Validator {

  @Override
  protected void validate(Controller controller) {
    validateRequiredString("username", "usernameMsg", "请输入用户名!");
    validateRequiredString("password", "passwordMsg", "请输入密码!");
  }

  @Override
  protected void handleError(Controller controller) {
    controller.keepModel(Members.class);
    controller.render("login.jsp");
  }

}

<c:choose>
<c:when test="${sessionScope.username!=null}">
    <span>
      <a href="javascript:void(0);" id="mycenter" style="">
        ${sessionScope.username}<s class="icon_arrow icon_arrow_down"></s>
      </a>
      <i class="line"></i>
      <a href="/logout" title="退出" id="user_login_out" style="padding: 0 6px;">退出</a>
    </span>
    </c:when>
  <c:otherwise>
    <span>
      <a title="登录" href="javascript:show_pop_login();" id="show_pop_login">登录</a>
    </span>
  </c:otherwise>
</c:choose>

/**
 * 弹出登录框
 */
function show_pop_login() {
  $.weeboxs.open(common.ctx + "/pages/login/login.jsp", {
    boxid : 'pop_user_login',
    contentType : 'ajax',
    showButton : false,
    showCancel : false,
    showOk : false,
    title : '会员登录',
    width : 700,
    type : 'wee'
  });
}

<form class="pop_login_form" action="${ctx}/login?callbackType=closeCurrent" method="post" onsubmit="return validateCallback(this, dialogAjaxDone);">
  <div class="row ">
    <div class="row">
      <label class="col-md-4" style="margin-top: 10px;" for="name">用户登录</label>
    </div>
    <div class="form-group">
      <div class="row">
        <div class="col-md-2 col-md-offset-2 tr th">
          <label for="name">账户</label>
        </div>
        <div class="col-md-5">
          <input type="text" style="" class="form-control required" id="username" name="username" placeholder="请输入会员编号"
            autocomplete="off">
        </div>
      </div>
    </div>
    <div class="form-group">
      <div class="row">
        <div class="col-md-2 col-md-offset-2 tr th">
          <label for="name">密码</label>
        </div>
        <div class="col-md-5">
          <input type="password" class="form-control required" id="password" name="password" placeholder="请输入登陆密码">
        </div>
      </div>
    </div>
    <div class="row">
      <div class="checkbox">
        <label> <input type="checkbox"> 记住我（下次自动登陆）
        </label>
      </div>
    </div>
    <div class="row">
      <button type="submit" style="margin-bottom: 10px;" class="btn btn-default">提交</button>
    </div>
  </div>
</form>

/**
 * 普通ajax表单提交
 * 
 * @param {Object}
 *      form
 * @param {Object}
 *      callback
 * @param {String}
 *      confirmMsg 提示确认信息
 */
function validateCallback(form, callback, confirmMsg) {
  var $form = $(form);
  if (!$form.valid()) {
    return false;
  }
  var _submitFn = function() {
    var forwardUrl = window.location.href;
    var formUrl = $form.attr("action");
    if (formUrl.indexOf("?") != -1) {
      formUrl += "&forwardUrl=" + forwardUrl;
    } else {
      formUrl += "?forwardUrl=" + forwardUrl;
    }
    $.ajax({
      type : form.method || 'POST',
      url : formUrl,
      data : $form.serializeArray(),
      dataType : "json",
      cache : false,
      success : callback || YUNM.ajaxDone,
      error : YUNM.ajaxError
    });
  }
  if (confirmMsg) {
    alertMsg.confirm(confirmMsg, {
      okCall : _submitFn
    });
  } else {
    _submitFn();
  }
  return false;
}

/**
 * dialog上的表单提交回调函数 服务器转回forwardUrl，可以重新载入指定的页面.
 * statusCode=YUNM.statusCode.ok表示操作成功, 自动关闭当前dialog
 */
function dialogAjaxDone(json) {
  YUNM.ajaxDone(json);
  if (json[YUNM.keys.statusCode] == YUNM.statusCode.ok || json[YUNM.keys.statusCode] == YUNM.statusCode.info) {
    if ("closeCurrent" == json.callbackType) {
      close_pop();
    }
    // 如果指定了后调转页面，进行调转
    if (json.forwardUrl) {
      location.href = json.forwardUrl;
    }
  }
}

  ajaxDone : function(json) {
    if (json[YUNM.keys.statusCode] == YUNM.statusCode.error) {
      if (json[YUNM.keys.message])
        $.showErr(json[YUNM.keys.message]);
      ;
    } else if (json[YUNM.keys.statusCode] == YUNM.statusCode.timeout) {
      alertMsg.error(json[YUNM.keys.message]);
    }
  },