JAVA 解析XML格式的字符串

package com.JsonandXML;

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;

/**
 * 经典的dom4j解析xml字符串实例1
 * @author iwin
 *
 */
public class classicsXML {
	/**
	 * @param 解析xml字符串
	 *            1。先加入dom4j.jar包 分析：根节点是：html ，子节点是head 、body ,
	 */
	public void readStringXml(String xml) {
		Document doc = null;
		try {
			// 1.读取并解析XML文档
			// SAXReader就是一个管道，用一个流的方式，把xml文件读出来
			/*
			 * SAXReader reader = new SAXReader(); //User.hbm.xml表示你要解析的xml文档
			 * Document document = reader.read(new File("User.hbm.xml"));
			 */
			// 下面的是通过解析xml字符串的
			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 Map readStringXmlOut(String xml) {
		Map map = new HashMap();
		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);
				map.put("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);
					map.put("username", username);
					map.put("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);
					map.put("result", result);
					map.put("banlce", banlce);
					map.put("subID", subID);
				}
			}
		} catch (DocumentException e) {
			e.printStackTrace();

		} catch (Exception e) {
			e.printStackTrace();
		}
		return map;
	}
	public static void main(String[] args) {

		// 下面是需要解析的xml字符串例子
		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>" + "</body>" + "</html>";
		/*
		 * Test2 test = new Test2(); test.readStringXml(xmlString);
		 */
		Map map = readStringXmlOut(xmlString);
		Iterator iters = map.keySet().iterator();
		while (iters.hasNext()) {
			String key = iters.next().toString(); // 拿到键
			String val = map.get(key).toString(); // 拿到值
			System.out.println(key + "=" + val);
		}
	}

}

 

解析的字符串格式：

<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>
</body>
</html>

  

局限性：

待解析的文件中，不能有重复标签，否则其标签值会被最有一个标签的值所覆盖；

eg：

当文件中有多个<username>yangrong_1</username>
<username>yangrong_2</username>

最后，输入解析文件时，只能输出yangrong_2