Java解析XML

1、接收xml文件或者字符串，转为InputStream
2、使用DocumentBuilderFactory对象将InputStream转为document对象

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
//创建DocumentBuilder对象
DocumentBuilder builder = factory.newDocumentBuilder();
Document d = builder.parse(inputStream);
//NodeList sList = d.getChildNodes();
NodeList sList = d.getElementsByTagName("Service_Header");

3、使用工具类遍历解析xml文档

import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class DomXmlParse {
	// 用Element方式
	public static void element(NodeList list) {
		for (int i = 0; i < list.getLength(); i++) {
			Element element = (Element) list.item(i);
			NodeList childNodes = element.getChildNodes();
			for (int j = 0; j < childNodes.getLength(); j++) {
				if (childNodes.item(j).getNodeType() == Node.ELEMENT_NODE) {
					// 获取节点
					System.out.print(childNodes.item(j).getNodeName() + ":");
					// 获取节点值
					System.out.println(childNodes.item(j).getFirstChild().getNodeValue());
				}
			}
		}
	}
	// 用node方式
	public static void node(NodeList list) {
		for (int i = 0; i < list.getLength(); i++) {
			Node node = list.item(i);
			NodeList childNodes = node.getChildNodes();
			for (int j = 0; j < childNodes.getLength(); j++) {
				if (childNodes.item(j).getNodeType() == Node.ELEMENT_NODE) {
					System.out.print(childNodes.item(j).getNodeName() + ":");
					System.out.println(childNodes.item(j).getFirstChild().getNodeValue());
				}
			}
		}
	}
}

NodeJS方式

方式一：xml2js

1、cmd控制台安装xml2js模块

npm install xml2js

2、实例代码，复制以下代码，保存为xmlparse.js

var parseString = require(‘xml2js‘).parseString;
 
var xml_string = ‘‘
+‘<?xml version="1.0" encoding="UTF-8" ?>‘
+‘<business>‘
+	‘<company>Code Blog</company>‘
+	‘<owner>Nic Raboy</owner>‘
+	‘<employee>‘
+		‘<firstname>Nic</firstname>‘
+		‘<lastname>Raboy</lastname>‘
+	‘</employee>‘
+	‘<employee>‘
+		‘<firstname>Maria</firstname>‘
+		‘<lastname>Campos</lastname>‘
+	‘</employee>‘
+‘</business>‘;
 
parseString(xml_string, function (err, result) {
	var json = JSON.stringify(result);
    console.log(json);
});

3、控制台执行

node xmlparse.js

4、输出

{"business":{"company":["Code Blog"],"owner":["Nic Raboy"],"employee":[{"firstname":["Nic"],"lastname":["Raboy"]},{"firstname":["Maria"],"lastname":["Campos"]}]}}

方式二：xmlreader

1、cmd控制台安装xmlreader模块

npm install xmlreader

2、实例代码，复制以下代码，保存为xmlparse.js

var xmlreader = require("xmlreader");
var fs = require("fs");
 
var xml_string = ‘<response id="1" shop="aldi">‘
+ 		‘This is some other content‘
+		‘<who name="james">James May</who>‘
+ 		‘<who name="sam">‘
+			‘Sam Decrock‘
+			‘<location>Belgium</location>‘
+		‘</who>‘
+ 		‘<who name="jack">Jack Johnsen</who>‘
+		‘<games age="6">‘
+			‘<game>Some great game</game>‘
+			‘<game>Some other great game</game>‘
+		‘</games>‘
+		‘<note>These are some notes</note>‘
+	‘</response>‘;

xmlreader.read(xml_string, function(errors, response){
	if(null !== errors ){
		console.log(errors)
		return;
	}
	console.log( response.response );
});

3、控制台执行

node xmlparse.js

4、输出

{
  attributes: [Function: attributes],
  parent: [Function],
  count: [Function],
  at: [Function],
  each: [Function],
  text: [Function],
  who: {
    array: [ [Object], [Object], [Object] ],
    count: [Function],
    at: [Function],
    each: [Function]
  },
  games: {
    attributes: [Function: attributes],
    parent: [Function],
    count: [Function],
    at: [Function],
    each: [Function],
    game: {
      array: [Array],
      count: [Function],
      at: [Function],
      each: [Function]
    }
  },
  note: {
    attributes: [Function: attributes],
    parent: [Function],
    count: [Function],
    at: [Function],
    each: [Function],
    text: [Function]
  }
}

总结

Java解析xml要自己遍历dom树，如果自己封装方法或工具类，会更加灵活；
NodeJS解析xml只要引入相应的包，解析更加便捷。

Java和NodeJS解析XML对比

原文：https://www.cnblogs.com/gail-hu/p/12989615.html