Java解析XML

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package com.cxx.xml;

import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
/**

• @Author: cxx

• Dom操作xml

• @Date: 2018/5/29 20:19
  */
  public class DomDemo {
  //用Element方式
  public static void element(NodeList list){
  for (int i = 0; i Element element = (Element) list.item(i);
  NodeList childNodes = element.getChildNodes();
  for (int j = 0; j if (childNodes.item(j).getNodeType()==Node.ELEMENT_NODE) {
  //获取节点
  System.out.print(childNodes.item(j).getNodeName() + “:”);
  //获取节点值
  System.out.println(childNodes.item(j).getFirstChild().getNodeValue());
  }
  }
  }
  }

  public static void node(NodeList list){
  for (int i = 0; i Node node = list.item(i);
  NodeList childNodes = node.getChildNodes();
  for (int j = 0; j if (childNodes.item(j).getNodeType()==Node.ELEMENT_NODE) {
  System.out.print(childNodes.item(j).getNodeName() + “:”);
  System.out.println(childNodes.item(j).getFirstChild().getNodeValue());
  }
  }
  }
  }

  public static void main(String[] args) {
  //1.创建DocumentBuilderFactory对象
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  //2.创建DocumentBuilder对象
  try {
  DocumentBuilder builder = factory.newDocumentBuilder();
  Document d = builder.parse(“src/main/resources/demo.xml”);
  NodeList sList = d.getElementsByTagName(“student”);
  //element(sList);
  node(sList);
  } catch (Exception e) {
  e.printStackTrace();
  }
  }
  }

package com.cxx.xml;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

/**

• @Author: cxx

• SAX解析DOM

• 一行一行 Handler

• startElement

• endElement

• @Date: 2018/5/29 20:03
  */
  public class SaxDemo {

  public static void main(String[] args) throws Exception {
  //1.或去SAXParserFactory实例
  SAXParserFactory factory = SAXParserFactory.newInstance();
  //2.获取SAXparser实例
  SAXParser saxParser = factory.newSAXParser();
  //创建Handel对象
  SAXDemoHandel handel = new SAXDemoHandel();
  saxParser.parse(“src/main/resources/demo.xml”,handel);
  }
  }

class SAXDemoHandel extends DefaultHandler {
//遍历xml文件开始标签
@Override
public void startDocument() throws SAXException {
super.startDocument();
System.out.println(“sax解析开始”);
}

//遍历xml文件结束标签
@Override
public void endDocument() throws SAXException {
    super.endDocument();
    System.out.println("sax解析结束");
}

@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
    super.startElement(uri, localName, qName, attributes);
    if (qName.equals("student")){
        System.out.println("============开始遍历student=============");
        //System.out.println(attributes.getValue("rollno"));
    }
    else if (!qName.equals("student")&&!qName.equals("class")){
        System.out.print("节点名称:"+qName+"----");
    }
}

@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
    super.endElement(uri, localName, qName);
    if (qName.equals("student")){
        System.out.println(qName+"遍历结束");
        System.out.println("============结束遍历student=============");
    }
}

@Override
public void characters(char[] ch, int start, int length) throws SAXException {
    super.characters(ch, start, length);
    String value = new String(ch,start,length).trim();
    if (!value.equals("")) {
        System.out.println(value);
    }
}

}

org.jdom jdom 1.1.3 package com.cxx.xml; import org.jdom.Attribute; import org.jdom.Document; import org.jdom.Element; import org.jdom.input.SAXBuilder; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStream; import java.util.List; /** * @Author: cxx * JDom解析xml * 快速开发XML应用程序。 * 是一个开源项目 * JDOM主要用来弥补DOM和SAX在实际应用当中的不足。 * @Date: 2018/5/30 11:44 */ public class JDomDemo { public static void main(String[] args) throws Exception { //1.创建SAXBuilder对象 SAXBuilder saxBuilder = new SAXBuilder(); //2.创建输入流 InputStream is = new FileInputStream(new File("src/main/resources/demo.xml")); //3.将输入流加载到build中 Document document = saxBuilder.build(is); //4.获取根节点 Element rootElement = document.getRootElement(); //5.获取子节点 List children = rootElement.getChildren(); for (Element child : children) { System.out.println("通过rollno获取属性值:"+child.getAttribute("rollno")); List attributes = child.getAttributes(); //打印属性 for (Attribute attr : attributes) { System.out.println(attr.getName()+":"+attr.getValue()); } List childrenList = child.getChildren(); System.out.println("======获取子节点-start======"); for (Element o : childrenList) { System.out.println("节点名:"+o.getName()+"---"+"节点值:"+o.getValue()); } System.out.println("======获取子节点-end======"); } } } dom4j dom4j 1.6.1

package com.cxx.xml;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

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

/**

• @Author: cxx
• Dom4j解析xml
• @Date: 2018/5/30 12:21
  */
  public class Dom4JDemo {
  public static void main(String[] args) throws Exception {
  //1.创建Reader对象
  SAXReader reader = new SAXReader();
  //2.加载xml
  Document document = reader.read(new File(“src/main/resources/demo.xml”));
  //3.获取根节点
  Element rootElement = document.getRootElement();
  Iterator iterator = rootElement.elementIterator();
  while (iterator.hasNext()){
  Element stu = (Element) iterator.next();
  List attributes = stu.attributes();
  System.out.println(“获取属性值”);
  for (Attribute attribute : attributes) {
  System.out.println(attribute.getValue());
  }
  System.out.println(“遍历子节点”);
  Iterator iterator1 = stu.elementIterator();
  while (iterator1.hasNext()){
  Element stuChild = (Element) iterator1.next();
  System.out.println(“节点名：”+stuChild.getName()+"—节点值："+stuChild.getStringValue());
  }
  }
  }
  }