Servlet文件accept.java和一个register.jsp文件

package Servlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class accept extends HttpServlet
{  
    public String codeToString(String str)
  {//处理中文字符串的函数
    String s=str;
    try
      {
      byte tempB[]=s.getBytes("ISO-8859-1");
      s=new String(tempB);
      return s;
  }
  catch(Exception e)
    {
    return s;
    }
  }
  public void init(ServletConfig config) throws ServletException
    {
      super.init(config);
    }
  public  void  doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {
       //设置mime
       response.setContentType("text/html;charset=GB2312");
       PrintWriter out=response.getWriter();
       out.println("<HTML><head><title>接收新用户注册</title></head><BODY>");
       out.println("这是新用户注册所提交的数据：<br>");
       out.println("用户名是："+codeToString(request.getParameter("username"))+"<br>");
       out.println("密码是："+codeToString(request.getParameter("userpassword"))+"<br>");
       out.println("性别是："+codeToString(request.getParameter("sex"))+"<br>");
       out.println("出生年月是："+request.getParameter("year")+request.getParameter("month")+request.getParameter("day")+"<br>");
       out.println("电子邮箱是："+request.getParameter("email")+"<br>");
       out.println("家庭住址是："+codeToString(request.getParameter("address"))+"<br>");
       out.println("</body> </html>");
    } 
}
<%@ page contentType="text/html;charset=gb2312" import="java.util.*" pageEncoding="utf-8"%>
<<script language="javascript">
function on_submit(){
  if(form1.username.value==""){
    alert("用户名不能为空，请输入用户名！");
    from1.username.focus();
    return false;
  }
  if(form1.reuserpassword.value==""){
    alert("用户确认密码不能为空，请输入密码！");
    from1.reuserpassword.focus();
    return false;
  }
  if(form1.userpassword.value!=form1.reuserpassword.value){
    alert("密码与确认密码不同！");
    from1.userpassword.focus();
    return false;
  }
  if (form1.email.value.length!= 0)
        {
            for (i=0; i<form1.email.value.length; i++)
              if (form1.email.value.charAt(i)=="@")
                    break;
            if (i==form1.email.value.length)
            {
              alert("非法EMail地址！");
              form1.email.focus();
              return false;
             }    
            }
  else
       {
        alert("请输入Email！");
        form1.email.focus();
        return false;

        }
 }

</script>
 <html>
 <head><title>新用户注册</title></head>  
  <body>
    <form method="post" action="servlet/accept" name=form1 onsubmit="return on_submit()">
    新用户注册<br>
  用户名(*)：<input type="text" name="username" size="20"><br>
  密&nbsp; 码(*)：<input type="password" name="userpassword" size="20"><br> 
  再输一次密码(*)：<input type="password" name="reuserpassword" size="20"><br>
  性别：<input type="radio" value="男" checked name="sex">男<input type="radio" name="sex" value="女">女<br>
  出生年月：<input name="year" size="4"  maxlength=4>年  
             <select name="month">
                  <option value="1" selected>1</option>
                  <option value="2">2</option>
                  <option value="3">3</option>
                  <option value="4">4</option>
                  <option value="5">5</option>
                  <option value="6">6</option>
                  <option value="8">7</option>
                  <option value="9">9</option>
                  <option value="10">10</option>
                  <option value="11">11</option>
                  <option value="12">12</option>
              </select>月 
              <input name="day" size="3"  maxlength=4>日<br>
  电子邮箱(*)：<input name="email"  maxlength=28><br>
  家庭住址：<input type="text" name="address" size="20"><br>
  <input type="submit" value="提交" name="B1"><input type="reset" value="全部重写" name="B2"><br>
</form>
  </body>
</html>