Ext.Ajax.request

 function create(){
         var itstate = $("#myselect").val();
          Ext.Ajax.request({
                 url: '/servlet/AccountManagement?action=create',
                 params: {itstate: itstate },
                 method: 'POST',
                 success: function (response,data) {
                      var json = Ext.util.JSON.decode(response.responseText);
                      var msg = json.msg;
                      var flag = json.success;
                      Ext.MessageBox.alert(flag, msg);
                      /**跳转到新建账单页面**/
                 },
                 failure: function (response) {
                     var json = Ext.util.JSON.decode(response.responseText);
                     var msg = json.msg;
                     var flag = json.failure;
                     Ext.MessageBox.alert(flag, msg);
                 }
          })
     };

js发送ajax请求：

 JSONObject data = new JSONObject();
 try{
     data.put("success", "成功");
     data.put("msg", "成功生成");
 } catch (SQLException e) {
     data.put("failure", "异常");
     data.put("msg", "出现未知异常，账期创建失败");
     e.printStackTrace();
 }              

后台响应