login.jsp页面表单

    
         
     用户名：
     
     密　码：
     
     
     				登  录
    

   login.jsp页面js

function formSubmit() {	var staffName = document.oForm.staffName.value;	var password = document.oForm.password.value;	if(staffName=="" || password ==""){		alert("登陆账号和密码不能为空");		return false;	}	//异步登录验证    $.ajax({            url:"login.do?method=check&staffName="+staffName+"&password="+password+"&" + "rd="+Math.random(),            type:"post",            success: function(response){	   	    if(response=="false"){   		alert("您输入的帐号或密码错误！");   		return false;	     }   	     if(response=="true"){  	        document.oForm.submit();   	      }	  }        });}

//loginController.java

public ModelAndView check(HttpServletRequest request			,HttpServletResponse response) throws Exception{		request.getSession().removeAttribute(STAFF_SESSION_NAME);		PrintWriter out = response.getWriter();		String staffName = request.getParameter("staffName");		String password = request.getParameter("password");		String hql = "FROM Staff WHERE loginName='"+StringUtils.sqlFormat(staffName)+"' AND loginPwd='"+StringUtils.sqlFormat(password)+"'";				List
    
      staffList = staffDao.find(hql);		if (staffList == null || staffList.size() == 0) {			out.print("false");			return null;		}else{			out.print("true");			return null;		}			}