有一处错误谁帮忙改下吧 - 编程论坛

程序代码：

<%@ page contentType="text/html;charset=gb2312" %>
<%@ page language="java" %>
<%@ page import="*" %>
<%@ page import="java.util.*" %>
<%@ page import="org.w3c.dom.*"%>
<%@ page import="javax.xml.parsers.*"%>
<%@ page import="javax.xml.transform.*" %>
<%@ page import="javax.xml.transform.stream.*"%>
<%@ page import="javax.xml.transform.dom.*"%>
<%@ page import="javax.xml.transform.OutputKeys.*"%>
<HTML>
<HEAD><TITLE>删除已受理订单</TITLE></HEAD>
<BODY>
<%
int i=0;
//建立一个解析器工厂，以获得一个具体的解析器对象：
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
//使用newDocumentBuilder()方法可以获得一个DocumentBuilder对象
DocumentBuilder db = dbf.newDocumentBuilder();
//打开现有的xml文档
Document doc = db.parse(getServletConfig().getServletContext().getRealPath ("book0.xml"));
try{
  Element root = doc.getDocumentElement();//根节点
  for(i=0;i<root.getChildNodes();i++)
      root.removeChild(root.getElemntsByTagName("book").item(i));
  String fileName = "book0.xml";
  String outFile = getServletConfig().getServletContext().getRealPath(fileName);
  //定义转换器
  Transformer tf = javax.xml.transform.TransformerFactory.newInstance().newTransformer();
  //防止汉字乱码
  tf.setOutputProperty(OutputKeys.ENCODING,"gb2312");
  //设定XSLT引擎在输出XML文档时,是否自动添加额外的空格
  tf.setOutputProperty(OutputKeys.INDENT,"yes");
  //将XML文档树doc转换输出到文件
  tf.transform(new DOMSource(doc),new StreamResult(outFile));
%>
已受理订单已经删除<br>
<a href=<%=fileName%>>点击这里打开产生的XML文档<%=fileName%> </a>
<%

}
catch (Exception e)

{
   System.out.println (e.getMessage());

}
%>
</BODY>
</HTML>

for(i=0;i<root.getChildNodes();i++)
root.removeChild(root.getElemntsByTagName("book").item(i));
这句错误了

程序代码：

org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 24 in the jsp file: /del_book.jsp
The operator < is undefined for the argument type(s) int, NodeList
21: Document doc = db.parse(getServletConfig().getServletContext().getRealPath ("book0.xml"));
22: try{
23:   Element root = doc.getDocumentElement();//根节点
24:   for(i=0;i<root.getChildNodes();i++)
25:       root.removeChild(root.getElemntsByTagName("book").item(i));
26:   String fileName = "book0.xml";
27:   String outFile = getServletConfig().getServletContext().getRealPath(fileName);

An error occurred at line: 25 in the jsp file: /del_book.jsp
The method getElemntsByTagName(String) is undefined for the type Element
22: try{
23:   Element root = doc.getDocumentElement();//根节点
24:   for(i=0;i<root.getChildNodes();i++)
25:       root.removeChild(root.getElemntsByTagName("book").item(i));
26:   String fileName = "book0.xml";
27:   String outFile = getServletConfig().getServletContext().getRealPath(fileName);
28:   //定义转换器

Stacktrace:
    org.apache.(DefaultErrorHandler.java:92)
    org.apache.(ErrorDispatcher.java:330)
    org.apache.(JDTCompiler.java:439)
    org.apache.(Compiler.java:334)
    org.apache.(Compiler.java:312)
    org.apache.(Compiler.java:299)
    org.apache.jasper.(JspCompilationContext.java:589)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)