Java dom4j生成与解析XML案例详解

< dependency >

     < groupId >dom4j</ groupId >

     < artifactId >dom4j</ artifactId >

     < version >1.6.1</ version >

</ dependency >

package com.oysept.xml;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import org.dom4j.Document;

import org.dom4j.DocumentHelper;

import org.dom4j.Element;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.XMLWriter;

import org.jdom2.output.Format;

/**

  * dom4j生成xml

  * @author ouyangjun

  */

public class CreateDom4j {

     public static void main(String[] args) {

         // 执行dom4j生成xml方法

         createDom4j( new File( "E:\\dom4j.xml" ));

     }

     public static void createDom4j(File file) {

         try {

             // 创建一个Document实例

             Document doc = DocumentHelper.createDocument();

             // 添加根节点

             Element root = doc.addElement( "root" );

             // 在根节点下添加第一个子节点

             Element oneChildElement= root.addElement( "person" ).addAttribute( "attr" , "root noe" );

             oneChildElement.addElement( "people" )

                     .addAttribute( "attr" , "child one" )

                     .addText( "person one child one" );

             oneChildElement.addElement( "people" )

                     .addAttribute( "attr" , "child two" )

                     .addText( "person one child two" );

             // 在根节点下添加第一个子节点

             Element twoChildElement= root.addElement( "person" ).addAttribute( "attr" , "root two" );

             twoChildElement.addElement( "people" )

                     .addAttribute( "attr" , "child one" )

                     .addText( "person two child one" );

             twoChildElement.addElement( "people" )

                     .addAttribute( "attr" , "child two" )

                     .addText( "person two child two" );

             // xml格式化样式

             // OutputFormat format = OutputFormat.createPrettyPrint(); // 默认样式

             // 自定义xml样式

             OutputFormat format = new OutputFormat();

             format.setIndentSize( 2 );  // 行缩进

             format.setNewlines( true ); // 一个结点为一行

             format.setTrimText( true ); // 去重空格

             format.setPadText( true );

             format.setNewLineAfterDeclaration( false ); // 放置xml文件中第二行为空白行

             // 输出xml文件

             XMLWriter writer = new XMLWriter( new FileOutputStream(file), format);

             writer.write(doc);

             System.out.println( "dom4j CreateDom4j success!" );

         } catch (UnsupportedEncodingException e) {

             e.printStackTrace();

         } catch (FileNotFoundException e) {

             e.printStackTrace();

         } catch (IOException e) {

             e.printStackTrace();

         }

     }

}

package com.oysept.xml;

import java.io.File;

import java.util.Iterator;

import java.util.List;

import org.dom4j.Attribute;

import org.dom4j.CDATA;

import org.dom4j.Comment;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.Element;

import org.dom4j.Node;

import org.dom4j.Text;

import org.dom4j.io.SAXReader;

/**

  * dom4j解析xml

  * @author ouyangjun

  */

public class ParseDom4j {

     public static void main(String[] args) {

         // 执行dom4j解析xml方法

         parseDom4j( new File( "E:\\dom4j.xml" ));

     }

     public static void parseDom4j(File file) {

         try {

             // 创建一个SAXReader解析器

             SAXReader reader = new SAXReader();

             // 读取xml文件,转换成Document结点

             Document doc = reader.read(file);

             // 递归打印xml文档信息

             StringBuffer buffer = new StringBuffer();

             parseElement(doc.getRootElement(), buffer);

             System.out.println(buffer.toString());

         } catch (DocumentException e) {

             e.printStackTrace();

         }

     }

     @SuppressWarnings ( "unchecked" )

     public static void parseElement(Element element, StringBuffer buffer) {

         buffer.append( "<" +element.getName());

         List<Attribute> attrs = element.attributes();

         if (attrs != null ) {

             for (Attribute attr : attrs) {

                 buffer.append( " " +attr.getName()+ "=\"" +attr.getValue()+ "\"" );

             }

         }

         buffer.append( ">" );

         Iterator<Node> iterator = element.nodeIterator();

         while (iterator.hasNext()) {

             Node node = iterator.next();

             if (node instanceof Element) {

                 Element eleNode = (Element) node;

                 parseElement(eleNode, buffer);

             }

             if (node instanceof Text) {

                 Text text = (Text) node;

                 buffer.append(text.getText());

             }

             if (node instanceof CDATA) {

                 CDATA dataNode = (CDATA) node;

                 buffer.append(dataNode.getText());

             }

             if (node instanceof Comment) {

                 Comment comNode = (Comment) node;

                 buffer.append(comNode.getText());

             }

         }

         buffer.append( "</" +element.getName()+ ">" );

     }

}