servlet中判断JSP中按钮问题

前台JSP页面代码：

[html] view plaincopy
<form action="http://localhost:8888/LN/SubmitServlet" method=post>  
<!--主标题-->  
<div class="bigTitle">提交申请</div>  
<!--横线-->  
<hr class="line"/>  
<!--按钮区-->  
<div class="btn">  
<input name="btnSave" type="submit" value="保存" />  
<input name="btnSubmit" type="submit" value="提交" />  
<input name="btnClose" type="submit" value="关闭" />  
  
</div>

 

注意type为submit。

servlet中判断代码：

[java] view plaincopy
public class SubmitServlet extends HttpServlet {  
    /** 
     *  
     */  
    private static final long serialVersionUID = 1L;  
      
    //PermissiontoApplyBusinessUnit EntityPAB=new PermissiontoApplyBusinessUnit();  
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  
           
        String iButton1 = (String)request.getParameter("btnSave");  
        String iButton2 = (String)request.getParameter("btnSubmit");  
        String iButton3 = (String)request.getParameter("btnClose");  
    //  request.setAttribute("str", iButton);  
      
        //System.out.print(iButton);  
        if(iButton1 != null){  
            //request.setAttribute("str1", "1");  
            System.out.println("保存");  
              
        }  
        else if (iButton2 != null){  
        //request.setAttribute("str1", "2");  
            System.out.println("提交");  
        }  
        else if (iButton3 != null){  
            //request.setAttribute("str1", "2");  
                System.out.println("关闭");  
        }  
          
      
        request.getRequestDispatcher("/ABUPSubmitApplications.jsp").forward(request, response);  
    }  
      
    public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{  
        doGet(request,response);  
    }  
}