我的action怎么没执行啊?急啊!!!
我的页面   是 
 tiaojia.jsp 
  <%@   page   language= "java "   import= "java.util.* "   pageEncoding= "GB2312 "%>  
  <% 
 response.setHeader( "Pragma ",    "No-cache "); 
 	response.setHeader( "Cache-Control ",    "no-cache "); 
 	response.setHeader( "Expires ",    "0 "); 
 	String   path=request.getContextPath(); 
 %>  
  <%@   include   file= "/taglibs.jsp "%>  
  <%@   include   file= "/checkSession.jsp "%>  
  <html>  
        <head>  
              <title> 加中科技医院信息系统 </title>  
              <link   href= "inc/style.css "   rel= "stylesheet ">  
        </head>  
        <body   >  
        <form   action= "tiaojiaAction.do "   method= "post ">     
        <table   width= "100% "   border= "0 "   align= "center "   cellpadding= "0 "   cellspacing= "1 "   height= "100 "   class= "tableborder ">  
          		 <tr>  
          			 <th   class= "th "   height= "30 "   colspan= "7 "> 调价盈亏统计 </th>  
          		 </tr>  
          		 <tr   align= "center ">  
          			 <td   class= "row "   height= "30 "   > 时间段: </td>  
          			 <td   class= "row "   height= "30 "   >  <input   name= "timefrom "   type= "text "   style= "width:100px "> 至 </td>  
          				 <td   class= "row "   height= "30 "   >  <input      name= "timeto "   type= "text "   style= "width:100px ">  </td>  
          			 <td   class= "row "   height= "30 "   > 消耗品名称: </td>  
          			 <td   class= "row "   height= "30 "   >  <input   name= "customername "   type= "text "   style= "width:100px ">  </td>            			 
          		 </tr>  
          		 <tr   align= "center ">  
          		 <td   class= "row "   height= "30 "   > 消耗品分类: </td>  
          			 <td   class= "row "   height= "30 ">  
 						 <select      name= "customersort "      style= "width:100px "      >   						 
 						       <option   value= "xiyao "   selected= "selected "> xiyao </option>  
 						       </select>  
 					 </td>  
 					 <td   class= "row "   height= "30 ">  
 					 <input   type= "submit "   name= "Submit "   value= "统计 "   />  
 					 </td>  
 					 <td   class= "row "   height= "30 ">  
 					 <input   type= "submit "   name= "Submit "