Java读取、创建xml（通过dom方式）

http://www.cnblogs.com/wangchenyang/archive/2011/08/23/2150530.html

创建一个接口

XmlInterface.java

/**

* 建立XML文档

* @param fileName 文件全路径名称

*/

public void createXml(String fileName);

/**

* 解析XML文档

* @param fileName 文件全路径名称

*/

public void parserXml(String fileName);

}

接口实现

XmlImpl.java

package com.test.xml;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.PrintWriter;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.transform.OutputKeys;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerConfigurationException;

import javax.xml.transform.TransformerException;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import org.xml.sax.SAXException;

public class XmlImpl implements XmlInterface{

private Document document;

public void init() {

try {

DocumentBuilderFactory factory = DocumentBuilderFactory

.newInstance();

DocumentBuilder builder = factory.newDocumentBuilder();

this.document = builder.newDocument();

} catch (ParserConfigurationException e) {

System.out.println(e.getMessage());

}

}

public void createXml(String fileName) {

Element root = this.document.createElement("scores");

this.document.appendChild(root);

Element employee = this.document.createElement("employee");

Element name = this.document.createElement("name");

name.appendChild(this.document.createTextNode("wangchenyang"));

employee.appendChild(name);

Element sex = this.document.createElement("sex");

sex.appendChild(this.document.createTextNode("m"));

employee.appendChild(sex);

Element age = this.document.createElement("age");

age.appendChild(this.document.createTextNode("26"));

employee.appendChild(age);

root.appendChild(employee);

TransformerFactory tf = TransformerFactory.newInstance();

try {

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);

System.out.println("生成XML文件成功!");

} catch (TransformerConfigurationException e) {

System.out.println(e.getMessage());

} catch (IllegalArgumentException e) {

System.out.println(e.getMessage());

} catch (FileNotFoundException e) {

System.out.println(e.getMessage());

} catch (TransformerException e) {

System.out.println(e.getMessage());

}

}

public void parserXml(String fileName) {

try {

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

DocumentBuilder db = dbf.newDocumentBuilder();

Document document = db.parse(fileName);

NodeList employees = document.getChildNodes();

for (int i = 0; i < employees.getLength(); i++) {

Node employee = employees.item(i);

NodeList employeeInfo = employee.getChildNodes();

for (int j = 0; j < employeeInfo.getLength(); j++) {

Node node = employeeInfo.item(j);

NodeList employeeMeta = node.getChildNodes();

for (int k = 0; k < employeeMeta.getLength(); k++) {

System.out.println(employeeMeta.item(k).getNodeName()

+ ":" + employeeMeta.item(k).getTextContent());

}

}

}

System.out.println("解析完毕");

} catch (FileNotFoundException e) {

System.out.println(e.getMessage());

} catch (ParserConfigurationException e) {

System.out.println(e.getMessage());

} catch (SAXException e) {

System.out.println(e.getMessage());

} catch (IOException e) {

System.out.println(e.getMessage());

}

}

}

测试

?
结果

生成xml

<?xml version="1.0" encoding="GB2312"?>
<scores>
<employee>
<name>wangchenyang</name>
<sex>m</sex>
<age>26</age>
</employee>
</scores>

读取xml

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