无法建立xml文件 dos命令下运行出错

Question

我按照书上的代码敲进eclipse，没报错，代码没问题，这个代码的功能是在同目录下建立一个与该java文件同名的xml文件，xml文件里输入了相关数据，但是运行后没反应，本地没生成该xml文件，浴室dos命令运行该java文件，javac编译通过，可是java时却“
F:\eclipse\WorkSpace\xmlupdate\src\xmlupdate>java cratexml
错误: 找不到或无法加载主类 cratexml

F:\eclipse\WorkSpace\xmlupdate\src\xmlupdate>“

报告无法加载主类，这是什么原因，网上说的classpath等配置之类的都没问题。以下是代码：

package xmlupdate;

import java.io.File;
import java.io.FileOutputStream;

import javax.xml.parsers.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

public class cratexml {
public static void main(String [] args){
org.w3c.dom.Document doc;
org.w3c.dom.Element booklist;
org.w3c.dom.Element book;

    try{
        DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
        DocumentBuilder builder=dbf.newDocumentBuilder();
        doc=builder.newDocument();
        if(doc!=null){
            booklist=doc.createElement("图书列表");
            book=doc.createElement("图书");
            booklist.appendChild(book);
            org.w3c.dom.Element isbn = doc.createElement("isbn");
            org.w3c.dom.Element name = doc.createElement("name");
            org.w3c.dom.Element author = doc.createElement("author");
            org.w3c.dom.Element price = doc.createElement("price");
            org.w3c.dom.Element num = doc.createElement("num");
            book.appendChild(name);
            book.appendChild(author);
            book.appendChild(price);
            book.appendChild(num);
            doc.appendChild(booklist);



            TransformerFactory transFactory=TransformerFactory.newInstance();
            Transformer transformer=transFactory.newTransformer();
            DOMSource domSource=new DOMSource();
            File file=new File("book.xml");
            FileOutputStream out=new FileOutputStream(file);
            StreamResult xmlResult=new StreamResult(out);
            transformer.transform(domSource, xmlResult);
        }
    }catch (Exception e){
        e.printStackTrace();
    }

}

}

Answer 1

http://zhidao.baidu.com/link?url=-dMCPfoasAe9A2Pof0zv1p1EeUonKPMcjjbpUxeym-CyJl5gjVILo-iTLzjB95x6jOzTy_6LYgOTuPKt3XIUF_kFrYRTkGTmzGq5HSS4Jgm