kotlin/java生成xml

四种方式

1. DOM方式
2. SAX方式
3. JDOM方式
4. DOM4J方式

Maven依赖

           
            
            
                org.jdom
                jdom
                2.0.2
            

            
            
                dom4j
                dom4j
                1.6.1
            

1.DOM方式

package imooc.write.toxml

import org.junit.Test
import java.io.File
import javax.xml.parsers.DocumentBuilderFactory
import javax.xml.transform.OutputKeys
import javax.xml.transform.TransformerFactory
import javax.xml.transform.dom.DOMSource
import javax.xml.transform.stream.StreamResult

/**
 * @author futao
 * Created on 2017/11/6 - 15:23.
 * 使用DOM方式生成xml文件
 */
class DOM {
    @Test
    fun xml() {
        val documentBuilderFactory = DocumentBuilderFactory.newInstance()
        val documentBuilder = documentBuilderFactory.newDocumentBuilder()
        //返回一个Document对象
        val document = documentBuilder.newDocument()
        //取消xml文件头的standalone信息
        document.xmlStandalone = true
        //创建了一个根节点
        val element = document.createElement("books")
        val book = document.createElement("book")
        book.setAttribute("id", "1")
        book.setAttribute("id2", "2")
        //创建name子节点
        val name = document.createElement("name")
//        name.nodeValue="Java实现生成xml文件"
        name.textContent = "Java实现生成xml文件"
        //添加到book子节点下
        book.appendChild(name)
        //向根节点添加子节点
        element.appendChild(book)
        //向DOM树中添加节点
        document.appendChild(element)

        val transformerFactory = TransformerFactory.newInstance()

        val transformer = transformerFactory.newTransformer()
        //是否自动换行
        transformer.setOutputProperty(OutputKeys.INDENT, "yes")
        transformer.transform(DOMSource(document), StreamResult(File("domBooks.xml")))


//        val outputFormat = OutputFormat.createPrettyPrint()
//        val xmlWriter = XMLWriter(FileOutputStream(File("domBooks.xml")))
//        xmlWriter.write(document)
//        xmlWriter.close()


    }
}

2. SAX方式

package imooc.write.toxml

import org.junit.Test
import org.xml.sax.helpers.AttributesImpl
import java.io.File
import java.io.FileOutputStream
import javax.xml.transform.OutputKeys
import javax.xml.transform.sax.SAXTransformerFactory
import javax.xml.transform.stream.StreamResult

/**
 * @author futao
 * Created on 2017/11/6 - 15:44.
 * 使用SAX方式生成xml文件
 */
class SAX {
    @Test
    fun xml() {
//        val saxParserFactory = SAXParserFactory.newInstance()
//        val saxParser = saxParserFactory.newSAXParser()
        val transformerFactory = SAXTransformerFactory.newInstance() as SAXTransformerFactory
        val transformerHandler = transformerFactory.newTransformerHandler()
        val transformer = transformerHandler.transformer
        //编码格式
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8")
        //是否换行
        transformer.setOutputProperty(OutputKeys.INDENT, "yes")
        val result = StreamResult(FileOutputStream(File("saxBooks.xml")))
        transformerHandler.setResult(result)
        //打开文档
        transformerHandler.startDocument()

        val attributesImpl = AttributesImpl()
        //books根节点开始
        transformerHandler.startElement("", "", "books", attributesImpl)

        attributesImpl.addAttribute("", "", "id", "", "1")
        //给子节点的属性赋值
        //book子节点开始
        transformerHandler.startElement("", "", "book", attributesImpl)
        //清除之前的属性值
        attributesImpl.clear()
        //book节点的子节点name节点开始
        transformerHandler.startElement("", "", "name", attributesImpl)
        //向name节点中添加值
        transformerHandler.characters("从入门到精通".toCharArray(), 0, "从入门到精通".toCharArray().size)
        //book节点的子节点name节点结束
        transformerHandler.endElement("", "", "name")
        //book子节点结束
        transformerHandler.endElement("", "", "book")
        //books根节点结束
        transformerHandler.endElement("", "", "books")


        //关闭文档
        transformerHandler.endDocument()


    }
}

3. JDOM方式

package imooc.write.toxml

import org.jdom2.CDATA
import org.jdom2.Document
import org.jdom2.Element
import org.jdom2.output.Format
import org.jdom2.output.XMLOutputter
import org.junit.Test
import java.io.File
import java.io.FileOutputStream

/**
 * @author futao
 * Created on 2017/11/6 - 18:59.
 * JDOM方式生成xml
 */
class JDOM {
    @Test
    fun xml() {
        //生成rss根节点
        val rss = Element("rss")
        //给rss节点添加属性值
        rss.setAttribute("id", "1")
        //生成channel节点
        val channel = Element("channel")
        //给rss节点添加channel子节点
        rss.addContent(channel)
        //生成title节点
        val title = Element("title")
        //设置title的内容
        title.text = "                 我是                 title                   "
        //把title节点添加到channel的子节点
        channel.addContent(title)


        val link1 = Element("link1")
        channel.addContent(link1)
        val content = CDATA("link")
        content.text = ">>><<<

4. DOM4J方式

package imooc.write.toxml


import org.dom4j.DocumentHelper
import org.dom4j.io.OutputFormat
import org.dom4j.io.XMLWriter
import org.junit.Test
import java.io.File
import java.io.FileOutputStream

/**
 * @author futao
 * Created on 2017/11/6 - 17:10.
 * DOM4J方法生成xml
 * 个人觉得比较方便
 */
class DOM4J {
    @Test
    fun xml() {
        //创建xml对象
        val document = DocumentHelper.createDocument()
        //添加rss节点
        val rss = document.addElement("rss")
        //rss节点的version属性
        rss.addAttribute("version", "2.0")
        //生成子节点和子节点信息
        val channel = rss.addElement("channel")
        val title = channel.addElement("title")
        title.addText("国内新闻")
        val link = channel.addElement("link")
        link.addText(">><><