框架选修课之dom4j解析xml字符串实例

//先加入dom4j.jar包 
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;
/**   
* @Title: TestDom4j.java
* @Package 
* @Description: 解析xml字符串
* @author 无处不在
* @date 2012-11-20 下午05:14:05
* @version V1.0   
*/
public class TestDom4j {
    public void readStringXml(String xml) {
        Document doc = null;
        try {
            // 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();
        }
    }
    /**
     * @description 将xml字符串转换成map
     * @param xml
     * @return Map
     */
    public static Map readStringXmlOut(String xml) {
        Map map = new HashMap();
        Document doc = null;
        try {
            // 将字符串转为XML
            doc = DocumentHelper.parseText(xml); 
            // 获取根节点
            Element rootElt = doc.getRootElement(); 
            // 拿到根节点的名称
            System.out.println("根节点：" + rootElt.getName()); 
            // 获取根节点下的子节点head
            Iterator iter = rootElt.elementIterator("head"); 
            // 遍历head节点
            while (iter.hasNext()) {
                Element recordEle = (Element) iter.next();
                // 拿到head节点下的子节点title值
                String title = recordEle.elementTextTrim("title"); 
                System.out.println("title:" + title);
                map.put("title", title);
                // 获取子节点head下的子节点script
                Iterator iters = recordEle.elementIterator("script"); 
                // 遍历Header节点下的Response节点
                while (iters.hasNext()) {
                    Element itemEle = (Element) iters.next();
                    // 拿到head下的子节点script下的字节点username的值
                    String username = itemEle.elementTextTrim("username"); 
                    String password = itemEle.elementTextTrim("password");
                    System.out.println("username:" + username);
                    System.out.println("password:" + password);
                    map.put("username", username);
                    map.put("password", password);
                }
            }
            //获取根节点下的子节点body
            Iterator iterss = rootElt.elementIterator("body"); 
            // 遍历body节点
            while (iterss.hasNext()) {
                Element recordEless = (Element) iterss.next();
                // 拿到body节点下的子节点result值
                String result = recordEless.elementTextTrim("result"); 
                System.out.println("result:" + result);
                // 获取子节点body下的子节点form
                Iterator itersElIterator = recordEless.elementIterator("form"); 
                // 遍历Header节点下的Response节点
                while (itersElIterator.hasNext()) {
                    Element itemEle = (Element) itersElIterator.next();
                    // 拿到body下的子节点form下的字节点banlce的值
                    String banlce = itemEle.elementTextTrim("banlce"); 
                    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);
        }
    }
}

/**
 * 解析包含有DB连接信息的XML文件
 * 格式必须符合如下规范：
 * 1. 最多三级，每级的node名称自定义；
 * 2. 二级节点支持节点属性，属性将被视作子节点；
 * 3. CDATA必须包含在节点中，不能单独出现。
 *
 * 示例1——三级显示：
 * <db-connections>
 *         <connection>
 *            <name>DBTest</name>
 *            <jndi></jndi>
 *            <url>
 *                <![CDATA[jdbc:mysql://localhost:3306/db_test?useUnicode=true&characterEncoding=UTF8]]>
 *             </url>
 *            <driver>org.gjt.mm.mysql.Driver</driver>
 *             <user>test</user>
 *            <password>test2012</password>
 *            <max-active>10</max-active>
 *            <max-idle>10</max-idle>
 *            <min-idle>2</min-idle>
 *            <max-wait>10</max-wait>
 *            <validation-query>SELECT 1+1</validation-query>
 *         </connection>
 * </db-connections>
 *
 * 示例2——节点属性：
 * <bookstore>
 *         <book category="cooking">
 *            <title lang="en">Everyday Italian</title>
 *            <author>Giada De Laurentiis</author>
 *            <year>2005</year>
 *            <price>30.00</price>
 *         </book>
 *
 *         <book category="children" title="Harry Potter" author="J K. Rowling" year="2005" price="$29.9"/>
 * </bookstore>