XML mapping 数据解析

test

public class TestOadXmlParse extends TestCase {

	public static void test() throws Exception {
		OadCommon.oadCache=OadXMLParse.getOad();
		System.out.println(OadCommon.oadCache.get("2112301"));
	}

}

  

xml

<?xml version="1.0" encoding="UTF-8"?>
<root>
	<mapping id="111" name="222"><!--ID降序排列 -->
		<!--key:ID,value:标识 -->
		<property key="2112300" value="00000200"></property>
		<property key="2112301" value="00100200"></property>
		<property key="2112302" value="00110200"></property>
		<property key="2112303" value="00120200"></property>
		<property key="3101657" value="27090200"></property>
	</mapping>

</root>

  

parse

package com.protocol.util;

import java.io.FileInputStream;
import java.io.InputStream;
import java.util.LinkedHashMap;

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

import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class OadXMLParse {
	private static final Logger log = Logger.getLogger("OadXMLParse");
//	private static LRUCache<Object, Object> lruCache;
	private static LinkedHashMap<String, String> dataMap;

	public static LinkedHashMap<String, String> getOad(String xmlPath) throws Exception {

		log.info("oad XML mapping path : " + xmlPath);
		// 1-获取XML-IO流
		InputStream xmlInputStream = getXmlInputStream(xmlPath);
		// 2-解析XML-IO流 ,获取Document 对象,以及Document对象 的根节点
		Element rootElement = getRootElementFromIs(xmlInputStream);
		// 3~5-从根元素解析得到元素
		parseElementFromRoot(rootElement);

		return dataMap;

	}

	// 1-获取XML-IO流
	private static InputStream getXmlInputStream(String xmlPath) {
		InputStream inputStream = null;
		try {
			// 1-把要解析的 XML 文档转化为输入流,以便 DOM 解析器解析它
			inputStream = new FileInputStream(xmlPath);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return inputStream;
	}

	// 2-解析XML-IO流 ,获取Document 对象,以及Document对象 的根节点
	private static Element getRootElementFromIs(InputStream inputStream) throws Exception {
		if (inputStream == null) {
			return null;
		}
		/*
		 * javax.xml.parsers 包中的DocumentBuilderFactory用于创建DOM模式的解析器对象 ,
		 * DocumentBuilderFactory是一个抽象工厂类,它不能直接实例化,但该类提供了一个newInstance方法 ,
		 * 这个方法会根据本地平台默认安装的解析器,自动创建一个工厂的对象并返回。
		 */
		// 2-调用 DocumentBuilderFactory.newInstance() 方法得到创建 DOM 解析器的工厂
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		// 3-调用工厂对象的 newDocumentBuilder方法得到 DOM 解析器对象。
		DocumentBuilder docBuilder = factory.newDocumentBuilder();
		// 4-调用 DOM 解析器对象的 parse() 方法解析 XML 文档,得到代表整个文档的 Document
		// 对象,进行可以利用DOM特性对整个XML文档进行操作了。
		Document doc = docBuilder.parse(inputStream);
		// 5-得到 XML 文档的根节点
		Element root = doc.getDocumentElement();
		// 6-关闭流
		if (inputStream != null) {
			inputStream.close();
		}
		return root;
	}

	// 3-从根元素解析得到元素
	private static void parseElementFromRoot(Element root) {
		NodeList nl = root.getChildNodes();
		for (int i = 0; i < nl.getLength(); i++) {
			Node node = nl.item(i);
			if (node instanceof Element) {
				Element ele = (Element) node;
				// 4-从元素解析得到属性值
				getDataFromElement(ele);
				// 5-从元素解析特定子元素并解析(以property为例)
				getCertainElementFromParentElement(ele);
			}
		}
	}

	// 4-从元素解析得到属性值
	private static void getDataFromElement(Element ele) {
		String id = ele.getAttribute("id");// 根据属性名称读取属性值
		String name = ele.getAttribute("name");
//		log.info("id == " + id);
//		log.info("name == " + name);
	}

	// 5-从元素解析特定子元素并解析(以property为例)
	private static void getCertainElementFromParentElement(Element ele) {

		// cache cize
//		lruCache = new LRUCache(1000);
		dataMap = new LinkedHashMap<String, String>();
		NodeList propertyEleList = ele.getElementsByTagName("property");// 根据标签名称获取标签元素列表
		for (int i = 0; i < propertyEleList.getLength(); i++) {
			Node node = propertyEleList.item(i);
			if (node instanceof Element) {
				Element propertyEle = (Element) node;
				String key = propertyEle.getAttribute("key");
				String value = propertyEle.getAttribute("value");
//				log.info("propertyEle: key == " + key);
//				log.info("propertyEle: value == " + value);
//				lruCache.put(key, value); //cache 方式
				dataMap.put(key, value);  //map方式
			}
		}
	}

}

OadCommon

package com.protocol.gb698.oad;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;

/**
 * oad 公共类
 * 
 * @author YinTao 2020-03-23
 */
public class OadCommon {
	private static final Logger log = Logger.getLogger(OadCommon.class);

//	public static LRUCache<Object, Object> oadCache;
	public static LinkedHashMap<String, String> oadCache;

	/**
	 * 根据key获取对应value
	 * 
	 * @param key
	 * @return
	 */
	public static byte[] getValue(String key) {
		Object Value = oadCache.get(key);
//		Object Value = dotaMap.get(key);
		log.info("key  : " + key + ", value :" + Value.toString());
		byte[] b = StrUtil.HexString2Bytes(Value.toString());

		return b;
	}

	
        /**
	 * get all key
	 * 
	 * @return
	 */
	public static List<String> getALLKeys() {
		List<String> list = new ArrayList<String>();
		Iterator<?> iter = oadCache.entrySet().iterator();
		while (iter.hasNext()) {
			Map.Entry entry = (Map.Entry) iter.next();
//			log.info("key= " + entry.getKey() + " and value= " + entry.getValue());
			list.add(entry.getKey().toString());
		}
		return list;
	}

}

  

  

  

原文地址:https://www.cnblogs.com/adao21/p/12560752.html