如何用java代码创建xml文件

用java自带的就可以，有问题可以问我

import javax.xml.parsers.DocumentBuilder

import javax.xml.parsers.DocumentBuilderFactory

//构造

public XMLUtil(String name) throws ParserConfigurationException {

filename = name

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance()

builder = factory.newDocumentBuilder()

document = builder.newDocument()

}

/**

* 保存到文件

*/

public void toSave() {

try {

TransformerFactory tf = TransformerFactory.newInstance()

Transformer transformer = tf.newTransformer()

DOMSource source = new DOMSource(document)

transformer.setOutputProperty(OutputKeys.ENCODING, "GB2312")

transformer.setOutputProperty(OutputKeys.INDENT, "yes")

PrintWriter pw = new PrintWriter(new FileOutputStream(filename))

StreamResult result = new StreamResult(pw)

transformer.transform(source, result)

} catch (TransformerException mye) {

mye.printStackTrace()

} catch (IOException exp) {

exp.printStackTrace()

}

}

package com.test.io

import java.io.File

import java.io.FileOutputStream

import java.io.IOException

import java.io.OutputStream

public class CreateXmlFile {

private static final String XML_TITLE = "<?xml version=\"1.0\" encoding=\"utf-8\"?>"

private static final String FILE_PATH = "d:"

private static final String FILE_SPE = "/"

private static final String CHANGE_LINES = "\n"

private static final String FILE_NAME = "text.xml"

public static void main(String[] args) {

String xml = appendStr()

try {

File file = createXmlFile(FILE_PATH + FILE_SPE + FILE_NAME)

writeDoc(file, xml)

System.out.println("文件已经创建:")

System.out.println("目录:" + FILE_PATH + FILE_SPE + FILE_NAME)

System.out.println("文件内容为:")

System.out.println(xml)

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

}

/**

* 组装XML内容

* @return

*/

private static String appendStr(){

StringBuffer sb = new StringBuffer()

sb.append(XML_TITLE).append(CHANGE_LINES)

sb.append("<book>").append(CHANGE_LINES)

sb.append("<name>").append(CHANGE_LINES)

sb.append("《好玩》").append(CHANGE_LINES)

sb.append("</name>").append(CHANGE_LINES)

sb.append("</book>").append(CHANGE_LINES)

return sb.toString()

}

/**

* 将内容写入文件

* @param file

* @param str

*/

private static void writeDoc(File file,String str){

OutputStream out = null

try {

out = new FileOutputStream(file)

out.write(str.getBytes())

}catch(Exception ex){

//

ex.printStackTrace()

}finally{

if(out != null){

try {

out.close()

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

}

}

}

/**

* 创建文件

* @param path

* @return

* @throws IOException

*/

private static File createXmlFile(String path) throws IOException{

File file = new File(path)

if(!file.exists()){

file.createNewFile()

}

return file

}

}

---