Java 如何使用dom方式读取和创建xml文件

发布时间：2020-11-11 17:08:31

来源：亿速云

阅读：101

作者：Leah

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Java 利用dom方式读取、创建xml详解

1.创建一个接口

XmlInterface.Java

public interface XmlInterface

{

/**

*

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

public class Main

{

public static void main(String

args[]){

XmlImpl

dd=new XmlImpl();

String

str="D:/grade.xml";

dd.init();

dd.createXml(str); //创建xml

dd.parserXml(str); //读取xml

}

}

结果

生成xml

wangchenyang

m

26

读取xml

生成XML文件成功!

#text:

name:wangchenyang

#text:

sex:m

#text:

age:26

#text:

解析完毕

以上就是Java 如何使用dom方式读取和创建xml文件，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注亿速云行业资讯频道。