Java与XML（二）用Java编写XML的读写程序

这是读取xml文件的java程序，我调试好的。采用的是dom方式读取xml文件到Vector中。

package src;

import java.io.*;

import java.util.Vector;

import javax.xml.parsers.*;

import org.w3c.dom.*;

public class readxml {

static Document document;

private boolean validating;

public readxml() {

}

public Vector toRead(String filename) {

Vector title=new Vector();

Vector content=new Vector();

String myStr=new String();

try {

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

factory.setValidating(validating);

DocumentBuilder builder = factory.newDocumentBuilder();

document = builder.parse(new File(filename));

document.getDocumentElement().normalize();

Node node = document.getFirstChild();

NodeList list = node.getChildNodes();

for (int i = 0; i

Node nodeitm = list.item(i);

if (nodeitm.getNodeName().equals("Title")) {

myStr=nodeitm.getFirstChild().getNodeValue();

title.addElement(myStr);//getFirstChild()

}

if (nodeitm.getNodeName().equals("Content")) {

myStr=nodeitm.getFirstChild().getNodeValue();

content.addElement(myStr);

}

}

} catch (Exception exp) {

exp.printStackTrace();

return null;

}

Vector all=new Vector();

all.add(title);

all.add(content);

return all;

}

public static void main(String[] args) {

Vector A;

readxml my = new readxml();

A = my.toRead("f:\\tomcat5\\webapps\\myxml\\xmldata\\9.xml");

for (int i = 0; i System.out.println(A.elementAt(i));}}}这是将xml写入文件。其中，transformer.setOutputProperty(OutputKeys.ENCODING,"GB2312")关系到编码问题，非常重要。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("f:\\tomcat5\\webapps\\myxml\\xmldata\\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.");}}}