Java 利用dom方式读取、创建xml详解及实例代码

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
 {
 
  
  public void createXml(String
 fileName); 
  
  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

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