xml的两种解析方式

Posted 2020-09-23 ljbguanli

xml解析是日常项目中用到比較多的技能。不管是配置參数或者数据都能够保存在xml文件里。同一时候也能够将xml作为数据传输的一种格式。本文将介绍两种基本解析方式：xml字符串解析和xml文件解析。

xml字符串解析

package com.discover.parse;

import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;

/**
 * @author 民团司令
 *
 */
public class XmlStringParser {
    public static void main(String[] args){
        String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
            +"<root><student><name>jim</name><age>12</age></student>"
            +"<student><name>jim</name><age>12</age></student></root>";
        try {
            Document document = DocumentHelper.parseText(xml);
            Element root = document.getRootElement();
            Iterator stuIterator = root.elementIterator("student");
            while (stuIterator.hasNext()) {
                Element student = (Element)stuIterator.next();
                String name = student.elementTextTrim("name");
                String age = student.elementTextTrim("age");
                System.out.println("name:"+name+",age:"+age);
            }
        } catch (DocumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

xml文件解析

package com.discover.parse;

import java.io.File;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

/**
 * @author 民团司令
 *
 */
public class XmlFileParser {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String xmlFilePath = XmlFileParser.class.getResource("").getPath()+"stuInfo.xml";
        File xmlFile = new File(xmlFilePath);
        if(xmlFile.exists())
        {
            SAXReader reader = new SAXReader();
            try {
                Document document = reader.read(xmlFile);
                Element root = document.getRootElement();
                Iterator stuIterator = root.elementIterator("student");
                while (stuIterator.hasNext()) {
                    Element student = (Element)stuIterator.next();
                    String name = student.elementTextTrim("name");
                    String age = student.elementTextTrim("age");
                    System.out.println("name:"+name+",age:"+age);
                }
            } catch (DocumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

依据读者的要求附上第2种方式的stuInfo.xml的内容，该文件和类文件放在同一文件夹就可以。

<?xml version="1.0" encoding="UTF-8"?
>
<root>
  <student>
    <name>jim</name>
    <age>12</age>
  </student>
  <student>
    <name>jim</name>
    <age>12</age>
  </student>
</root>

两种解析方式都是採用的dom4j实现，该jar能够在例如以下官网下载

http://www.dom4j.org/dom4j-1.6.1/