java解析xml的几种方式

第一种：DOM。
import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

public class DomTest1
{
public static void main(String[] args) throws Exception
{
// step 1: 获得dom解析器工厂（工作的作用是用于创建具体的解析器）
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

// System.out.println("class name: " + dbf.getClass().getName());

// step 2:获得具体的dom解析器
DocumentBuilder db = dbf.newDocumentBuilder();

// System.out.println("class name: " + db.getClass().getName());

// step3: 解析一个xml文档，获得Document对象（根结点）
Document document = db.parse(new File("candidate.xml"));

NodeList list = document.getElementsByTagName("PERSON");

for(int i = 0; i < list.getLength(); i++)
{
Element element = (Element)list.item(i);

String content = element.getElementsByTagName("NAME").item(0).getFirstChild().getNodeValue();

System.out.println("name:" + content);

content = element.getElementsByTagName("ADDRESS").item(0).getFirstChild().getNodeValue();

System.out.println("address:" + content);

content = element.getElementsByTagName("TEL").item(0).getFirstChild().getNodeValue();

System.out.println("tel:" + content);

content = element.getElementsByTagName("FAX").item(0).getFirstChild().getNodeValue();

System.out.println("fax:" + content);

content = element.getElementsByTagName("EMAIL").item(0).getFirstChild().getNodeValue();

System.out.println("email:" + content);

System.out.println("--------------------------------------");
}
}
}



import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Attr;
import https://www.wendangku.net/doc/8f1114136.html,ment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import https://www.wendangku.net/doc/8f1114136.html,dNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
* 使用递归解析给定的任意一个xml文档并且将其内容输出到命令行上
* @author zhanglong
*
*/
public class DomTest3
{
public static void main(String[] args) throws Exception
{
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();

InputStream in = JdbcUtil.class.getClassLoader().getResourceAsStream("student.xml");
Document doc = db.parse(in);
//获得根元素结点
Element root = doc.getDocumentElement();

parseElement(root);
}

private static void parseElement(Element element)
{
String tagName = element.getNodeName();

NodeList children = element.getChildNodes();

System.out.print("<" + tagName);

//element元素的所有属性所构成的NamedNodeMap对象，需要对其进行判断
NamedNodeMap map = element.getAttributes();

//如果该元素存在属性
if(null != map)
{
for(int i = 0; i < map.getLength(); i++)
{
//获得该元素的每一个属性
Attr attr = (Attr)map.item(i);

String attrName = attr.getName();
String attrValue = attr.getValue();

System.out.print(" " + attrName + "=\"" + attrValue + "\"");
}
}

System.out.print(">");

for(int i = 0; i < children.getLength(); i++)
{
Node node = children.item(i);
//获得结点的类型
short nodeType = node.getNodeType();

if(nodeType == Node.ELEMENT_NODE)
{
//是元素，继续递归
parseElement((Element)node);
}
else if(nodeType == Node.TEXT_NODE)
{
//递归出口
System.out.print(node.getNodeValue());
}
else if(nodeType == https://www.wendangku.net/doc/8f1114136.html,MENT_NODE)
{
System.out.print("");
}
}

System.out.print("");
}
}


sax：SAX的全称是Simple APIs for XML
import java.io.File;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class SaxTest1
{
public static void main(String[] args) throws Exception
{
//step1： 获得SAX解析器工厂实例
SAXParserFactory factory = SAXParserFactory.newInstance();

//step2: 获得SAX解析器实例
SAXParser parser = factory.newSAXParser();

//step3: 开始进行解析
parser.parse(new File("student.xml"), new MyHandler());

}
}

class MyHandler extends DefaultHandler
{
@Override
public void startDocument() throws SAXException
{
System.out.println("parse began");
}

@Override
public void endDocument() throws SAXException
{
System.out.println("parse finished");
}

@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException
{
System.out.println("start element");
}

@Override
public void endElement(String uri, String localName, String qName)
throws SAXException
{
System.out.println("finish element");
}
}



import java.io.File;
import java.util.Stack;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class SaxTest2
{
public static void main(String[] args) throws Exception
{
SAXParserFactory factory = SAXParserFactory.newInstance();

SAXParser parser = factory.newSAXParser();

parser.parse(new File("student.xml"), new MyHandler2());
}
}

class MyHandler2 extends DefaultHandler
{
private Stack stack = new Stack();

private String name;

private String gender;

private String age;

@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException
{
stack.push(qName);

for(int i = 0; i < attributes.getLength(); i++)
{
String attrName = attributes.getQName(i);
String attrValue = attributes.getValue(i);

System.out.println(attrName + "=" + attrValue);
}
}

@Override
public void characters(char[] ch, int start, int length)
throws SAXException
{
String tag = stack.peek();

if("姓名".equals(tag))
{
name = new String(ch, start,length);
}
else if("性别".equals(tag))
{
gender = new String(ch, start, length);
}
else if("年龄".equals(tag))
{
age = new String(ch, start, length);
}
}

@Override
public void endElement(String uri, String localName, String qName)
throws SAXException
{
stack.pop(); //表示该元素已经解析完毕，需要从栈中弹出

if("学生".equals(qName))
{
System.out.println("姓名：" + name);
System.out.println("性别：" + gender);
System.out.println("年龄：" + age);

System.out.println();
}

}
}


JDOM:

jdom创建xml

import java.io.FileWriter;

import org.jdom.Attribute;
import https://www.wendangku.net/doc/8f1114136.html,ment;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

public class JDomTest1
{
public static void main(String[] args) throws Exception
{
Document document = new Document();

Element root = new Element("root");

document.addContent(root);

Comment comment = new Comment("This is my comments");

root.addContent(comment);

Element e = new Element("hello");

e.setAttribute("sohu", "https://www.wendangku.net/doc/8f1114136.html,");

root.addContent(e);

Element e2 = new Element("world");

Attribute attr = new Attribute("test", "hehe");

e2.setAttribute(attr);

e.addContent(e2);

e2.addContent(new Element("aaa").setAttribute("a", "b")
.setAttribute("x", "y").setAttribute("gg", "hh").setText("text content"));


Format format = Format.getPrettyFormat();

format.setIndent(" ");
// format.setEncoding("gbk");

XMLOutputter out = new XMLOutputter(format);

out.output(document, new FileWriter("jdom.xml"));

}
}

JDOM解析xml

import java.io.File;
import java.io.FileOutputStream;
import java.util.List;

import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

public class JDomTest2
{
public static void main(String[] args) throws Exception
{
SAXBuilder builder = new SAXBuilder();

Document doc = builder.build(new File("jdom.xml"));

Element element = doc.getRootElement();

System.out.println(element.getName());

Element hello = element.getChild("hello");

System.out.println(hello.getText());

List list = hello.getAttributes();

for(int i = 0 ;i < list.size(); i++)
{
Attribute attr = (Attribute)list.get(i);

String attrName = attr.getName();
String attrValue = attr.getValue();

System.out.println(attrName + "=" + attrValue);
}

hello.removeChild("world");

XMLOutputter

out = new XMLOutputter(Format.getPrettyFormat().setIndent(" "));


out.output(doc, new FileOutputStream("jdom2.xml"));

}
}



Dom4j

import java.io.FileOutputStream;
import java.io.FileWriter;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class Test1
{
public static void main(String[] args) throws Exception
{
// 创建文档并设置文档的根元素节点 ：第一种方式
// Document document = DocumentHelper.createDocument();
//
// Element root = DocumentHelper.createElement("student");
//
// document.setRootElement(root);

// 创建文档并设置文档的根元素节点 ：第二种方式
Element root = DocumentHelper.createElement("student");
Document document = DocumentHelper.createDocument(root);

root.addAttribute("name", "zhangsan");

Element helloElement = root.addElement("hello");
Element worldElement = root.addElement("world");

helloElement.setText("hello");
worldElement.setText("world");

helloElement.addAttribute("age", "20");

XMLWriter xmlWriter = new XMLWriter();
xmlWriter.write(document);

OutputFormat format = new OutputFormat(" ", true);

XMLWriter xmlWriter2 = new XMLWriter(new FileOutputStream("student2.xml"), format);
xmlWriter2.write(document);

XMLWriter xmlWriter3 = new XMLWriter(new FileWriter("student3.xml"), format);

xmlWriter3.write(document);
xmlWriter3.close();

}
}



import java.io.File;
import java.util.Iterator;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.DOMReader;
import org.dom4j.io.SAXReader;

public class Test2
{
public static void main(String[] args) throws Exception
{
SAXReader saxReader = new SAXReader();

Document doc = saxReader.read(new File("student2.xml"));

Element root = doc.getRootElement();

System.out.println("root element: " + root.getName());

List childList = root.elements();

System.out.println(childList.size());

List childList2 = root.elements("hello");

System.out.println(childList2.size());

Element first = root.element("hello");

System.out.println(first.attributeValue("age"));

for(Iterator iter = root

.elementIterator(); iter.hasNext();)
{
Element e = (Element)iter.next();

System.out.println(e.attributeValue("age"));
}

System.out.println("---------------------------");

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
org.w3c.dom.Document document = db.parse(new File("student2.xml"));

DOMReader domReader = new DOMReader();

//将JAXP的Document转换为dom4j的Document
Document d = domReader.read(document);

Element rootElement = d.getRootElement();

System.out.println(rootElement.getName());

}
}


import java.io.FileWriter;

import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

public class Test3
{
public static void main(String[] args) throws Exception
{
Document document = new Document();

Element root = new Element("联系人列表").setAttribute(new Attribute("公司",
"A集团"));

document.addContent(root);

Element contactPerson = new Element("联系人");

root.addContent(contactPerson);

contactPerson
.addContent(new Element("姓名").setText("张三"))
.addContent(new Element("公司").setText("A公司"))
.addContent(new Element("电话").setText("021-********"))
.addContent(
new Element("地址")
.addContent(new Element("街道").setText("5街"))
.addContent(new Element("城市").setText("上海"))
.addContent(new Element("省份").setText("上海市")));

XMLOutputter output = new XMLOutputter(Format.getPrettyFormat()
.setIndent(" ").setEncoding("gbk"));

output.output(document, new FileWriter("contact.xml"));

}
}