java生成xml(详细版)

最新推荐文章于 2023-02-06 11:07:00 发布

Elina_1992

最新推荐文章于 2023-02-06 11:07:00 发布

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本文介绍了一个简单的XML文档操作示例，包括如何使用Java创建和解析XML文档。通过具体代码展示了XML文档的基本结构，并演示了如何将数据写入XML以及如何从XML中读取数据。

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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

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

读取xml

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