DOM4J 解析XML文件

最新推荐文章于 2021-04-08 14:45:06 发布

原创最新推荐文章于 2021-04-08 14:45:06 发布 · 308 阅读

CC 4.0 BY-SA版权

本文详细解析了如何使用Java和DOM4J库从城市XML文件中读取天气信息，涵盖了从顶级节点到子节点的遍历过程，最终将weatherCode与城市名称映射为键值对。

<?xml version="1.0" encoding="UTF-8"?>

<China>
  <province id="01" name="北京">
    <city id="0101" name="北京">
      <county id="010101" name="北京" weatherCode="101010100"/>
      <county id="010102" name="海淀" weatherCode="101010200"/>
      <county id="010103" name="朝阳" weatherCode="101010300"/>
      <county id="010104" name="顺义" weatherCode="101010400"/>
      <county id="010105" name="怀柔" weatherCode="101010500"/>
      <county id="010106" name="通州" weatherCode="101010600"/>
      <county id="010107" name="昌平" weatherCode="101010700"/>
      <county id="010108" name="延庆" weatherCode="101010800"/>
      <county id="010109" name="丰台" weatherCode="101010900"/>
      <county id="010110" name="石景山" weatherCode="101011000"/>
      <county id="010111" name="大兴" weatherCode="101011100"/>
      <county id="010112" name="房山" weatherCode="101011200"/>
      <county id="010113" name="密云" weatherCode="101011300"/>
      <county id="010114" name="门头沟" weatherCode="101011400"/>
      <county id="010115" name="平谷" weatherCode="101011500"/>
    </city>
  </province>
</China>

做了一个天气项目解析城市XML

import java.io.File;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class ParseXml {
	public Map<String,String> read() {
		Map<String,String> map = null;
		try {
			SAXReader reader = new SAXReader();
			URL resoucePath = PropertiesLoader.class.getClassLoader()
					.getResource("city_code.xml");
			File file = new File(resoucePath.getPath());
			Document document = reader.read(file);
			// 获取根节点
			Element root = document.getRootElement();

			Iterator<?> iter = root.elementIterator("province"); // 获取根节点下的子节点province
			map = new HashMap<String,String>();
			// 遍历province节点
			while (iter.hasNext()) {
				Element recordEle = (Element) iter.next();

				Iterator<?> iters = recordEle.elementIterator("city"); // 获取子节点province下的子节点city
				// 遍历province节点下的city节点
				while (iters.hasNext()) {
					Element itemEle = (Element) iters.next();

					Iterator<?> itor = itemEle.elementIterator("county"); // 获取子节点city下的子节点county
					// 遍历city下的子节点county
					while (itor.hasNext()) {
						Element countryEle = (Element) itor.next();
						String id = countryEle.attributeValue("weatherCode");
						String name = countryEle.attributeValue("name");
						map.put(id, name);
					}
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return map;
	}

	public static void main(String[] args) {
		ParseXml parseXml = new ParseXml();
		Map<String,String> map = parseXml.read();
		for (Entry<String, String> entry: map.entrySet()) {

		    String key = entry.getKey();
		    String value = entry.getValue();
		    System.out.println(key+value);

		}
	}
}