利用jsp/servlet/Ajax，实现一个猜数字游戏！

来源：互联网发布：国外二维码扫描软件编辑：程序博客网时间：2024/04/30 06:37

源码：

http://download.csdn.net/detail/m1872216/4651239

Ajax的局部刷新：

input.jsp

<body>
<div id="msg" style="color:red"></div>

<form action="login.do" method="post" name="form1" onsubmit="return onClick()">
<table border="1">
<tr>
<td>
设置数字:
</td>
<td>
<input type="text" name="num"/>
</td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="提交"/>
</td>
</tr>
</table>
</form>
<script type="text/javascript" src="js/myAjax.js"></script>
   <script type="text/javascript">
   function onClick(){
    var num=document.form1.num.value;
    var params="num="+num;
    ajaxPost("login.do",params,function(txt){
    document.getElementById("msg").innerHTML=txt;
    });

return false;
}
   </script>
</body>

servlet：

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
   throws ServletException, IOException {

  doPost(req, resp);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  // TODO Auto-generated method stub
  //String count=request.getParameter("count");
  response.setContentType("text/html;charset=utf-8");
  HttpSession session=request.getSession();
  //访问的次数
       if(session.getAttribute("times")==null){
        Random rd=new Random();
      int count=rd.nextInt(10);
       System.out.println(count);
     session.setAttribute("count", count);
     session.setAttribute("times", 0);
       }

       ///////////////////////////////////////////////////////////////
       if((Integer)session.getAttribute("times")==0){
        int times=(Integer)session.getAttribute("times");
        session.setAttribute("times", times+1);//初次访问
        showResult(request,response);

       }else{
        showResult(request,response);
       }


}

public void showResult(HttpServletRequest request, HttpServletResponse response) throws IOException {
  response.setContentType("text/html;charset=utf-8");
  PrintWriter out=response.getWriter();
  HttpSession session=request.getSession();

  //获取访问的第几次
     int times=(Integer)session.getAttribute("times");

     //获取客户端提交的数据
    int num=0;
     try{
     num=Integer.parseInt(request.getParameter("num"));
     }catch(NumberFormatException ne){
     out.println("非法输入");
     return;
     }


     //获取随机数
     int realnum=(Integer)session.getAttribute("count");

     if(num>realnum){
   out.println("再小一点");
   session.setAttribute("times", times+1);
  }else if(num<realnum){
   out.println("再大一点");
   session.setAttribute("times", times+1);
  }else{
   times=(Integer)session.getAttribute("times");
   out.println("答对了,花了"+times+"次");
   session.removeAttribute("times");
  }

}