刚学jsp,期待大神们的到来!解决思路

刚学jsp,期待大神们的到来!!!
DengRuServer.java

Java code

package DengRuServer;
import java.io.*;
import java.sql.*;
import java.sql.Date;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class DengRuServer extends HttpServlet {
    String user,neirong,yanzhengma;
    public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        Connection  conn=null;
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();

        user=request.getParameter("user");        //通过ID获取前台的昵称
        neirong=request.getParameter("neirong");      
        yanzhengma=request.getParameter("yanzhengma");
        System.out.println("用户名:"+user+"内容:"+neirong);
        HttpSession session=request.getSession();
        //String code1=(String)session.getAttribute("code");

        //if(yanzhengma.equals(code1))                //验证码正确执行
        
            SimpleDateFormat matter=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            
            String date=matter.format(new Date(1000));
            System.out.println("读取时间"+date);
            String sql="insert into shiyichanglang values('"+neirong+"','"+date+"','"+user+"')";
            try {
                conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/sss","root","hin19920309");
                System.out.println("连接数据库成功");
                Statement  sta=conn.createStatement();
                int rs=sta.executeUpdate(sql);
                System.out.println("数据插入成功");
            } catch (SQLException e) {
                e.printStackTrace();
            }
            String returnValues="<div><input name=user type=text>";
            returnValues=returnValues+neirong;
            returnValues=returnValues+"</input></div>";
            out.write(returnValues);
            System.out.println("数据插入成功");
            /*}else{                             //验证码错误执行
            String returnValues="alert('验证码错误!')";
            response.getWriter().write(returnValues);
        }
            out.flush();
            out.close();*/    
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        this.doGet(request, response);
    }
}




shiyichanglang.jsp

VBScript code
<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"  
    "http://www.w3.org/TR/html4/loose.dtd">
<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<link href="css\Style_135.css" rel="stylesheet" type="text/css" />

<title>完全训练--诗意长廊</title>

<style>

#gn{

width:100%;

height:30px;

float:right;

clear: both;

text-align:right;

padding-right:8px;

padding-top:5px;

background-color: #FFFFFF;

filter:alpha(opacity=35);

color:#000000;

}

#gn table { text-align:right;}

#gn td { color:#000000;}

#gn a{color:#000000;}

</style>

</head>



<body topmargin=0 leftmargin=0>

<div id="menu" class='d'>

<TABLE>

<TR>

<TD>

<ul>

<li ><a href="shiyichanglang\01.html" target=list >欣赏作品一</a></li>

<li  ><a href="03.html" target=list>欣赏作品二</a></li>

<li  ><a href="05.html" target=list>欣赏作品三</a></li>

<li  ><a href="06.html" target=list>欣赏作品四</a></li>

</ul>

</TD>

</TR>

</TABLE>

</div>

<TABLE>

<TR>

<TD>

<iframe frameBorder=0 marginHeight=0 marginWidth=0 scrolling=auto src=shiyichanglang\01.html width=800 height=550 name=list></iframe> 

</td>

  </tr>

</table>
<br>
<table width="100%" border="0" cellspacing="10" cellpadding="0">
  <tr>
    <td width="20%" height="234">&nbsp;</td>
    <td width="62%" align="left" valign="top"><form name="form1">
    
      <table width="100%" border="0" cellspacing="10" cellpadding="0">
        <tr>
          <td width="8%">昵称:</td>
          <td colspan="2"><input name="user" type="text" id="user" size="30" maxlength="32"></td>
          <td width="37%">&nbsp;</td>
          <td width="15%">&nbsp;</td>
        </tr>
        <tr>
          <td height="53">密码:</td>
          <td colspan="2"><input name="password" type="password" id="password" size="30" maxlength="32"></td>
          <td>路人评论可不用密码 </td>
          <td>&nbsp;</td>
        </tr>
        <tr>
          <td height="38">验证码:</td>
          <td width="12%"><input name="yanzhengma" type="text" id="yanzhengma" size="10" maxlength="4"></td>
          <td width="28%"><img border=0 src="image.jsp"></td>
          <td>&nbsp;</td>
          <td>&nbsp;</td>
        </tr>
        <tr>
          <td valign="top">内容:</td>
          <td colspan="3"><textarea name="neirong" id="neirong" cols="50" rows="10"></textarea></td>
          <td>&nbsp;</td>
        </tr>
        <tr>
          <td height="26">&nbsp;</td>
          <td><input type="button" name="tijiao" id="tijiao" value="发表留言" onClick=createXMLHttpRequest()></td>
          <td><input type="button" name="quxiao" id="quxiao" value="取消"></td>
          <td>&nbsp;</td>
          <td>&nbsp;</td>
        </tr>
      </table>
    </form></td>
    <td width="18%">&nbsp;</td>
  </tr>
</table>
<div id="pinglun"></div>
</body>

<script charSet="utf-8">
    var httprequest;
    function createXMLHttpRequest() {
        alert("成功访问函数createXMLHttpRequest()");
        if (window.XMLHttpRequest) {
            httprequest = new XMLHttpRequest();
        } else if (window.ActiveXObject) {
            httprequest = new ActiveXObject("Microsoft.XMLHTTP");
        }
        url="dengruserver.do";
        httprequest.open('GET', url, true);
        httprequest.onreadystatechange = OnStatusChange;
        httprequest.send();
    }
    function OnStatusChange()  
    {
        if (httprequest.readyState == 4) // 完全接受
        {
            if (httprequest.status == 200) // 服务器已经成功响应
            {   
                alert("访问服务器成功");
                document.getElementById('pinglun').innerHTML = httprequest.responseText;
            } else // 访问出错
            {
                alert(httprequest.responseText);
                alert("访问出错");
            }
        }
    }
</script>
</html>