java实现简单读取xml文件或解析XML的实例

原创已于 2024-04-17 16:56:15 修改 · 784 阅读

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#java #xml

于 2021-04-20 15:35:14 首次发布

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本文介绍两种XML解析方法：一种是通过DOM解析本地XML文件并提取特定元素；另一种是使用Dom4j解析XML字符串，并展示了如何遍历节点获取所需数据。

<?xml version="1.0" encoding="GB2312"?>
<RESULT>
<VALUE>
  <NO>A1234</NO>
  <ADDR>广东省深圳市</ADDR>
</VALUE>
<VALUE>
  <NO>B1234</NO>
  <ADDR>广东省深圳市</ADDR>
</VALUE>
</RESULT>

1、文件解析DOM实现方法

import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;

public class MyXMLReader2DOM {
public static void main(String arge[]) {

  long lasting = System.currentTimeMillis();

  try {
    File f = new File("data_10k.xml");
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document doc = builder.parse(f);
    NodeList nl = doc.getElementsByTagName_r("VALUE");
   for (int i = 0; i < nl.getLength(); i++) {
     System.out.print("车牌号码:"+ doc.getElementsByTagName_r("NO").item(i).getFirstChild().getNodeValue());
     System.out.println("车主地址:"+ doc.getElementsByTagName_r("ADDR").item(i).getFirstChild().getNodeValue());
    }
   } catch (Exception e) {
    e.printStackTrace();
   }
}
}

2、字符串解析方式

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
 
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
 
/**
 * @description 解析xml字符串
 */
public class Test {
    public static void readStringXml(String xml) {
        Document doc = null;
        try {
            doc = DocumentHelper.parseText(xml); // 将字符串转为XML
            Element rootElt = doc.getRootElement(); // 获取根节点
            System.out.println("根节点：" + rootElt.getName()); // 拿到根节点的名称
            Iterator iter = rootElt.elementIterator("head"); // 获取根节点下的子节点head
            // 遍历head节点
            while (iter.hasNext()) {
                Element recordEle = (Element) iter.next();
                String title = recordEle.elementTextTrim("title"); // 拿到head节点下的子节点title值
                System.out.println("title:" + title);
                Iterator iters = recordEle.elementIterator("script"); // 获取子节点head下的子节点script
                // 遍历Header节点下的Response节点
                while (iters.hasNext()) {
                    Element itemEle = (Element) iters.next();
                    String username = itemEle.elementTextTrim("username"); // 拿到head下的子节点script下的字节点username的值
                    String password = itemEle.elementTextTrim("password");
                    System.out.println("username:" + username);
                    System.out.println("password:" + password);
                }
            }
            Iterator iterss = rootElt.elementIterator("body"); ///获取根节点下的子节点body
            // 遍历body节点
            while (iterss.hasNext()) {
                Element recordEless = (Element) iterss.next();
                String result = recordEless.elementTextTrim("result"); // 拿到body节点下的子节点result值
                System.out.println("result:" + result);
                Iterator itersElIterator = recordEless.elementIterator("form"); // 获取子节点body下的子节点form
                // 遍历Header节点下的Response节点
                while (itersElIterator.hasNext()) {
                    Element itemEle = (Element) itersElIterator.next();
                    String banlce = itemEle.elementTextTrim("banlce"); // 拿到body下的子节点form下的字节点banlce的值
                    String subID = itemEle.elementTextTrim("subID");
                    System.out.println("banlce:" + banlce);
                    System.out.println("subID:" + subID);
                }
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

    public static void main(String[] args) {
        String xmlString = "<html>"
                + "<head>"
                + "     <title>dom4j解析一个例子</title>"
                + "     <script>"
                + "         <username>yangrong</username>"
                + "         <password>123456</password>"
                + "     </script>"
                + "</head>"
                + "<body>"
                + "     <result>0</result>"
                + "     <form>"
                + "         <banlce>1000</banlce>"
                + "         <subID>36242519880716</subID>"
                + "     </form>"
                + "     <form>"
                + "         <banlce>200</banlce>"
                + "         <subID>222222222222</subID>"
                + "     </form>"
                + "</body>"
                + "</html>";
        readStringXml(xmlString);
    }