中文XML论坛--高手帮我看看程序哪里出错了？

Error page newuser An error occured in the bean. Error Message is: nullStack Trace is : java.lang.NullPointerException
at org.apache.xml.utils.TreeWalker.dispatachChars(TreeWalker.java:292)
at org.apache.xml.utils.TreeWalker.startNode(TreeWalker.java:436)
at org.apache.xml.utils.TreeWalker.traverse(TreeWalker.java:191)
at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:325)
at asp_standard.UserRegist.regist(UserRegist.java:63)
at jsp_servlet.__newuser._jspService(__newuser.java:189)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6452)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3661)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2630)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)

user_register.jsp
<%@ page contentType="text/html;charset=GBK"%>
<%@ page errorPage="user_register_error.jsp" %>

<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
    <title>User register</title>
  </head>
  <body>
    <center>
     <%
  String userid = request.getParameter("userid");
  if ( userid == null ) {
    userid = "";
  }
  String email = request.getParameter("email");
  if ( email == null ) {
    email = "";
  }
  String name = request.getParameter("name");
  if ( name == null ) {
    name = "";
  }
  String password = request.getParameter("password");
  if ( password == null ) {
    password = "";
  }%>


      <form action="newuser.jsp" method="get">
      <P>用户名：   
          <input type="text" name="userid" value=<%=userid%>/>
      </P>
      <P>密码：        
          <input type="password" name="password" value=<%=password%>/>
      </P>
      <P>确认密码：
          <input type="password" name="conform"/></P>
      <P>姓名：      
          <input type="text" name="name" value=<%=name%>/></P>
      <P>Email：    
          <input type="text" name="email" value=<%=email%>/></P>
      <P> </P>
          <input type="submit" value="Submit"/>
     </form>
    </center>
  </body>
</html>

UserInfo.java

package asp_standard;

public class UserInfo {

public UserInfo() {
}

  private String userid;
  private String password;
  private String name;
  private String email;
  private String usertype;
  public String getUserid()
  {
     return this.userid;
  }
  public void setUserid(String c)
  {
     this.userid=c;
  }
  public String getUserpassword()
  {
     return this.password;
  }
  public void setUserpassword(String c)
  {
     this.password=c;
  }
  public String getUsername()
  {
     return this.name;
  }
  public void setUsername(String c)
  {
     this.name=c;
  }
  public String getUseremail()
  {
     return this.email;
  }
  public void setUseremail(String c)
  {
     this.email=c;
  }
  public String getUsertype()
  {
     return this.usertype;
  }
  public void setUsertype(String c )
  {
     this.usertype=c;
  }

}

UserRegist.java

package asp_standard;

import java.io.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.SAXParseException;
import org.w3c.dom.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.FileOutputStream;

public class UserRegist {

  private UserInfo userInfo;
  public UserRegist() {
  }

public void setUserInfo(UserInfo userinfo)
{
    this.userInfo=userinfo;
}
public void regist()throws IOException,SAXException{
    try{

      String user_id=userInfo.getUserid();
      String user_name=userInfo.getUsername();
      String user_password=userInfo.getUserpassword();
      String user_email=userInfo.getUseremail();
      //String user_type=userInfo.getUsertype();

      System.out.print(user_id);
      DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
      DocumentBuilder db=dbf.newDocumentBuilder();
      Document document=db.parse("E:\\myProgram\\AspStandard\\asp\\user_info.xml");

      Element root = document.getDocumentElement();
      Element userList = document.createElement("user");
      root.appendChild(userList);
      Element infor = document.createElement("user_id");
      userList.appendChild(infor);
      Text text = document.createTextNode(user_id);
      infor.appendChild(text);
      infor = document.createElement("user_password");
      userList.appendChild(infor);
      text = document.createTextNode(user_password);
      infor.appendChild(text);
      infor = document.createElement("user_name");
      userList.appendChild(infor);
      text = document.createTextNode(user_name);
      userList.appendChild(infor);
      infor = document.createElement("user_email");
      userList.appendChild(infor);
      text = document.createTextNode(user_email);
      userList.appendChild(infor);

      TransformerFactory tfactory=TransformerFactory.newInstance();
      Transformer transformer=tfactory.newTransformer();
      DOMSource source=new DOMSource(document);
      StreamResult result=new StreamResult(new File("E:\\myProgram\\AspStandard\\asp\\user_info.xml"));
      transformer.transform(source,result);

    }catch(ParserConfigurationException pe){
        pe.printStackTrace();
    }catch(TransformerConfigurationException e){
   }catch(TransformerException e){
   }catch(IOException e){
   }catch(SAXParseException e){
      System.out.println("Error...................");}


}

}

newuser.jsp

<%@ page contentType="text/html; charset=GBK" %>
<%@ page errorPage="newuser_error.jsp" %>
<jsp:useBean id="userInfo" class="asp_standard.UserInfo" scope="page">
<jsp:setProperty name="userInfo" property="*"/>
</jsp:useBean>
<jsp:useBean id="regist" class="asp_standard.UserRegist" scope="page"/>
<html>
<head>
<title>用户信息注册页面</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<%

  regist.setUserInfo(userInfo);
  regist.regist();
  out.println("注册成功");
%>
<br>

</body>
</html>


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