Detailed explanation of Java's example code for reading and creating xml using dom method

This article mainly introduces the relevant information about Java using dom method to read and create xml. Friends who need it can refer to

Java uses dom method to read and create. Detailed explanation of creating xml

1. Create an interface

XmlInterface.Java

public interface XmlInterface
 {
 
  /** 
  *
 建立XML文档 
  *
 @param fileName 文件全路径名称 
  */
  public void createXml(String
 fileName); 
  /** 
  *
 解析XML文档 
  *
 @param fileName 文件全路径名称 
  */
  public void parserXml(String
 fileName); 
}

Interface implementation

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());
  }
 }
}

Test

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
 }
}

Result

Generate xml

<?xml version="1.0" encoding="GB2312"?>
<scores>
<employee>
<name>wangchenyang</name>
<sex>m</sex>
<age>26</age>
</employee>
</scores>

Read xml

生成XML文件成功!
#text:
 
name:wangchenyang
#text:
 
sex:m
#text:
 
age:26
#text:
 
解析完毕

The above is the detailed content of Detailed explanation of Java's example code for reading and creating xml using dom method. For more information, please follow other related articles on the PHP Chinese website!