下面小编就为大家带来一篇java读取XML文件的四种方法总结(必看篇)。小编觉得挺不错的，现在就分享给大家，也给大家做个参考。一起跟随小编过来看看吧
JAVA操作XML文档主要有四种方式，分别是DOM、SAX、JDOM和DOM4J，DOM和SAX是官方提供的，而JDOM和DOM4J则是引用第三方库的，其中用的最多的是DOM4J方式。运行效率和内存使用方面最优的是SAX，但是由于SAX是基于事件的方式，所以SAX无法在编写XML的过程中对已编写内容进行修改，但对于不用进行频繁修改的需求，还是应该选择使用SAX。
下面基于这四种方式来读取XML文件。
第一，以DOM的方式实现。package xmls; 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; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import java.io.File; import java.io.IOException; /** * Created by lenovo on 2017-6-3. */ public class DomreadDemo { public static void main(String[] args){ DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); try{ DocumentBuilder db = dbf.newDocumentBuilder(); Document document = db.parse("src/xmls/DOM.xml"); NodeList booklist = document.getElementsByTagName("book"); for(int i = 0; i第二，以SAX的方式实现。package xmls; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; /** * Created by lenovo on 2017-6-1. */ public class xmlTest2 { public static void main(String[] args){ SAXParserFactory spf = SAXParserFactory.newInstance(); try{ SAXParser sp = spf.newSAXParser(); SAXParserHandler handler = new SAXParserHandler(); sp.parse("src\xmls\book.xml", handler); }catch (Exception e){ e.printstacktrace(); } } }package xmls; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; /** * Created by lenovo on 2017-6-1. */ public class SAXParserHandler extends DefaultHandler { @Override public void startDocument() throws SAXException { super.startDocument(); System.out.println("SAX解析开始"); } @Override public void endDocument() throws SAXException { super.endDocument(); System.out.println("SAX解析结束"); } @Override public void startElement(String s, String s1, String s2, Attributes attributes) throws SAXException { super.startElement(s, s1, s2, attributes); System.out.println(s2); for(int i = 0; i第三，以JDOM的方式实现。package xmls; import org.jdom2.Attribute; import org.jdom2.Document; import org.jdom2.Element; import org.jdom2.JDOMException; import org.jdom2.input.JDOMParseException; import org.jdom2.input.SAXBuilder; import java.io.*; import java.util.List; /** * Created by lenovo on 2017-6-2. */ public class JDOMTest { public static void main(String[] args){ SAXBuilder saxBuilder = new SAXBuilder(); InputStream in; try{ in = new FileInputStream(new File("src\xmls\book.xml")); Document document = saxBuilder.build(in); Element rootElement = document.getRootElement(); List bookList = rootElement.getChildren(); for(Element book: bookList){ System.out.println("第" + (bookList.indexOf(book)+1) + "本书！"); List attrs = book.getAttributes(); for(Attribute attr: attrs){ System.out.println(attr.getName() + "=" + attr.getValue()); } for(Element item: book.getChildren()){ System.out.println(item.getName() + ":" + item.getValue()); } System.out.println("------------------------------------"); } }catch (FileNotFoundException e){ e.printstacktrace(); }catch (JDOMException e){ e.printstacktrace(); }catch (IOException e){ e.printstacktrace(); } } }第四，以DOM4J的方式实现。package xmls; import org.dom4j.*; import org.dom4j.io.OutputFormat; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.Iterator; import java.util.List; /** * Created by lenovo on 2017-6-2. */ public class DOM4JTest { public void parseXML(){ SAXReader saxReader = new SAXReader(); try{ Document document = saxReader.read(new File("src\xmls\book.xml")); Element rootElement = document.getRootElement(); Iterator it = rootElement.elementIterator(); while (it.hasNext()){ Element book = (Element)it.next(); List attrs = book.attributes(); for(Attribute attr: attrs){ System.out.println("属性名：" + attr.getName() + "---- 属性值：" + attr.getValue() ); } Iterator cit = book.elementIterator(); while (cit.hasNext()){ Element child = (Element) cit.next(); System.out.println("子节点：" + child.getName()); } } }catch (DocumentException e){ e.printstacktrace(); } } public static void main(String[] args){ DOM4JTest dom4JTest = new DOM4Jtest(); dom4JTest.parseXML(); } }
