如何用java生成xml

Question

<map>
 <layer id=1>
</layer>
</map>
我引用了
import org.w3c.dom.*;
import javax.xml.parsers.*
请问是这样写的吗？
DocumentBuilderFactor factory=DocumentBuilderFactory.newInstance();
DocumentBuilder builder=factory.newDocumentBuilder()
Document doc= builder.newDocument;
Element map=doc.createElement("map")
doc.appendChild(map);
Element layer=doc.createElement("layer")
layer.setAttribute("id","1");
map.appendChild(layer);

Answer 1

那我通过jdom生产了document怎么再 转化为String ？
是document 的 tostring方法吗？

Answer 2

暑假生产实习做了一个Java对象与XML的相互转换项目，以下有个用java生成XML的例子，你可以参考一下，你应该一看就懂了:

Answer 3

import org.w3c.dom.*; 
import javax.xml.parsers.*; 
import javax.xml.transform.*; 
import javax.xml.transform.dom.DOMSource; 
import javax.xml.transform.stream.StreamResult; 
import java.io.*; 
public class writexml{ 
 private Document document; 
 private String filename; public writexml(String name) throws ParserConfigurationException{ 
filename=name; 
DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance(); 
DocumentBuilder builder=factory.newDocumentBuilder();
document=builder.newDocument(); 
} 
public void toWrite(String mytitle,String mycontent){ 
Element root=document.createElement("WorkShop"); 
document.appendChild(root); 
Element title=document.createElement("Title"); 
title.appendChild(document.createTextNode(mytitle)); 
root.appendChild(title); 
Element content=document.createElement("Content"); 
content.appendChild(document.createTextNode(mycontent)); 
root.appendChild(content);} 
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(); 
} 
} 
public static void main(String args[]){ 
try{ 
writexml myxml=new writexml("d:\\9.xml"); 
myxml.toWrite("中文题目","中文内容"); 
myxml.toSave(); 
System.out.print("Your writing is successful!"); 
} 
catch(ParserConfigurationException exp){ 
exp.printStackTrace(); 
System.out.print("Your writing is failed!"); 
} 
} 
} 

Answer 4

dom4j read xml
package com.scjp;import java.io.File;
import java.io.FileWriter;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.dom4j.Node;
public class ParserXmlDom4j
{
    public final static String filePath = "com\\scjp\\MyXml.xml";    public Document parse(File file) throws DocumentException
    {
        SAXReader reader = new SAXReader();
        Document document = reader.read(file);        return document;
    }    public void getXml(Document document) throws DocumentException
    {
        Element root = document.getRootElement();
        Iterator it = root.elementIterator();        //Iterator it = root.elementIterator("name");
        //Iterator it = root.attributeIterator();
        while (it.hasNext())
        {
            Element sub = (Element) it.next();
        }
    }    public void getNode(Document document) throws DocumentException
    {
        //List list = document.selectNodes("//row/person");
        Node node = document.selectSingleNode("//row/person/name");
        String value = node.getText();
        System.out.println("value : " + value);
    }
    
    public void writeXml() throws Exception
    {
    Document doc = DocumentHelper.createDocument();
    Element root = doc.addElement("root");
    root.addComment("this is test xml file");
    ArrayList children = new ArrayList();
    Element ele1 = root.addElement("element1");
    ele1.addAttribute("attr1","a");
    ele1.addAttribute("attr2","b");
    ele1.setText("this is element1");
    Element ele2 = root.addElement("element2");
    ele2.addAttribute("attr21","c");
    ele2.setText("this is element2");
    
    XMLWriter writer = null;
    OutputFormat format = OutputFormat.createPrettyPrint();
    writer = new XMLWriter(new FileWriter(new File("com\\scjp\\MyXml3.xml")),format);
    writer.write(doc);
    writer.close();
    
    
    }
  
    public static void main(String[] args)
    {
        ParserXmlDom4j pxd = new ParserXmlDom4j();        try
        {
        
            File file = new File(filePath);
            Document document = pxd.parse(file);
           
            
            Element root = document.getRootElement();
            List list = root.selectNodes("//root/standards");
            for(Iterator it = list.iterator();it.hasNext();)
            {
            Element subElement = (Element)it.next();
            Attribute subAttr = subElement.attribute("type");
            if("a3".equals(subAttr.getValue()))
            {
            for(Iterator ita = subElement.elementIterator("standard");ita.hasNext();)
            {
            Element belement = (Element)ita.next();
            String sno = belement.attributeValue("sno");
            System.out.println("sno : "+sno );
            }
            /*
            List a3List = subElement.selectNodes("/@sno");
            for(Iterator it3 = a3List.iterator();it3.hasNext();)
            {
            Attribute attr3 = (Attribute)it3.next();
            String novalue = attr3.getValue();
            System.out.println("novalue : "+ novalue);
            }
            */
            }
            }
   
            pxd.writeXml();
            /*
            List list = root.selectNodes("//root/standards/standard/@sno");
            for(int i=0; i<list.size(); i++)
            {
            Attribute attrs = (Attribute)list.get(i);
            String no = attrs.getValue();
            System.out.println("no value : "+ no);
            }
            */
            /*
            for(Iterator it = root.elementIterator("author"); it.hasNext();)
            {
            Element sub = (Element)it.next();
            String name = sub.attributeValue("name");
            String location = sub.attributeValue("location");
            String fulName = sub.getText();
            System.out.println("name "+name+" location : "+ location+" fulName "+ fulName);
            }
            */
            //pxd.getNode(doc);
        //SAXReader reader = new SAXReader();
            //Document document = reader.read(filePath);
        /*
        List list = document.selectNodes("//c/a/b/@color");            for (Iterator iter = list.iterator(); iter.hasNext();)
            {
                Attribute attribute = (Attribute) iter.next();
                String color = attribute.getValue();
                System.out.println("color : "+ color);
                if (color.equals("255.255.0"))
                {
                    attribute.setValue("0.0.0");
                }
            }
           */
        
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}<?xml version="1.0" encoding="UTF-8"?><!-- 
<xml-body>
<config>
  <font>
      <name>HanZi</name>
      <size unit="pt">36</size>
  </font>
</config>
</xml-body><row>
<person>
<name>王小明</name>
<college>信息学院</college>
<telephone>6258113</telephone>
<notes>男,1955年生,博士，95年调入海南大学</notes>
</person>
</row><c>
<a name="a">
   <b color="255.255.0"/>
</a>
<a name="b">
   <b color="255.255.1"/>
</a>
</c><root>
  <author name="James" location="UK">James Strachan</author>
  <author name="Bob" location="US">Bob McWhirter</author>
</root>
--> <standards type="a3">
   <standard sno="1" svalue="400" />
   <standard sno="3" svalue="400" />
 </standards>
 <standards type="b9">
   <standard sno="1" svalue="300" />
 </standards>

Answer 5

jdom!!!!! XMLWriter writer = null;
    OutputFormat format = OutputFormat.createPrettyPrint();
    writer = new XMLWriter(new FileWriter(new File("MyXml.xml")),format);
    writer.write(doc);
    writer.close();