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。