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JAVA创建、读取XML

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Java读取、创建xml（通过dom方式）

创建一个接口

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);
}

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

技术分享650) this.width=650;" src="/upload/getfiles/default/2022/11/13/20221113053452240.jpg" /> 

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

技术分享650) this.width=650;" src="/upload/getfiles/default/2022/11/13/20221113053452240.jpg" />

读取xml

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

 


原文：http://7883830.blog.51cto.com/7873830/1616574

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