Share a method of parsing an xml string through dom4j

DOM4J

## Compared with using DOM, SAX, and JAXP mechanisms to parse xml, DOM4J performs better, has excellent performance, powerful functions, and is extremely easy to use. With the characteristics of use, as long as you understand the basic concepts of DOM, you can parse xml through dom4j's api document. dom4j is a set of open source APIs. In actual projects, dom4j is often chosen as a tool for parsing xml.

Let’s first take a look at the inheritance relationship established by the DOM tree corresponding to XML in dom4j

##For the XML standard definition, corresponding to the content listed in Figure 2-1, dom4j provides the following implementation:

At the same time, dom4j's NodeType enumeration implements the node type defined in the XML specification. In this way, the node type can be determined by

constants when traversing the xml document.

Commonly used API

##class

org.dom4j.io.SAXReader

read provides multiple ways to read xml files and returns a Domcument
• object

interface org.dom4j.

Document

iterator Use this method to get node
getRootElement Get the root node
interface org.dom4j.Node

getName Get the node name, for example, get the root node name as bookstore
getNodeType Get the node type constant value, for example, get the bookstore type as 1 - Element
getNodeTypeName Get the node type name. For example, the obtained bookstore type name is Element
interface org.dom4j.Element

attributes Returns the
• attributes

  list of the element

attributeValue Gets the attribute value based on the passed-in attribute name
elementIterator Returns an iterator containing child elements
elements Returns a list containing child elements

• ##interface org.dom4j.Attribute

getName Get the attribute name

• getValue Get the attribute value

• interface org.dom4j.Text

getText Get the Text node value

• interface org.dom4j.CDATA

getText Get the CDATA Section value

• interface org. dom4j.Comment

• getText  获取注释 

实例一：

  1 //先加入dom4j.jar包   2 import java.util.HashMap;  3 import java.util.Iterator;  4 import java.util.Map;  5   6 import org.dom4j.Document;  7 import org.dom4j.DocumentException;  8 import org.dom4j.DocumentHelper;  9 import org.dom4j.Element; 10  11 /**    12 * @Title: TestDom4j.java 13 * @Package 
 14 * @Description: 解析xml字符串 15 * @author 无处不在 16 * @date 2012-11-20 下午05:14:05 17 * @version V1.0   
 18 */ 19 public class TestDom4j { 20  21     public void readStringXml(String xml) { 22         Document doc = null; 23         try { 24  25             // 读取并解析XML文档 26             // SAXReader就是一个管道，用一个流的方式，把xml文件读出来 27             //  28             // SAXReader reader = new SAXReader(); //User.hbm.xml表示你要解析的xml文档 29             // Document document = reader.read(new File("User.hbm.xml")); 30             // 下面的是通过解析xml字符串的 31             doc = DocumentHelper.parseText(xml); // 将字符串转为XML 32  33             Element rootElt = doc.getRootElement(); // 获取根节点 34             System.out.println("根节点：" + rootElt.getName()); // 拿到根节点的名称 35  36             Iterator iter = rootElt.elementIterator("head"); // 获取根节点下的子节点head 37  38             // 遍历head节点 39             while (iter.hasNext()) { 40  41                 Element recordEle = (Element) iter.next(); 42                 String title = recordEle.elementTextTrim("title"); // 拿到head节点下的子节点title值 43                 System.out.println("title:" + title); 44  45                 Iterator iters = recordEle.elementIterator("script"); // 获取子节点head下的子节点script 46  47                 // 遍历Header节点下的Response节点 48                 while (iters.hasNext()) { 49  50                     Element itemEle = (Element) iters.next(); 51  52                     String username = itemEle.elementTextTrim("username"); // 拿到head下的子节点script下的字节点username的值 53                     String password = itemEle.elementTextTrim("password"); 54  55                     System.out.println("username:" + username); 56                     System.out.println("password:" + password); 57                 } 58             } 59             Iterator iterss = rootElt.elementIterator("body"); ///获取根节点下的子节点body 60             // 遍历body节点 61             while (iterss.hasNext()) { 62  63                 Element recordEless = (Element) iterss.next(); 64                 String result = recordEless.elementTextTrim("result"); // 拿到body节点下的子节点result值 65                 System.out.println("result:" + result); 66  67                 Iterator itersElIterator = recordEless.elementIterator("form"); // 获取子节点body下的子节点form 68                 // 遍历Header节点下的Response节点 69                 while (itersElIterator.hasNext()) { 70  71                     Element itemEle = (Element) itersElIterator.next(); 72  73                     String banlce = itemEle.elementTextTrim("banlce"); // 拿到body下的子节点form下的字节点banlce的值 74                     String subID = itemEle.elementTextTrim("subID"); 75  76                     System.out.println("banlce:" + banlce); 77                     System.out.println("subID:" + subID); 78                 } 79             } 80         } catch (DocumentException e) { 81             e.printStackTrace(); 82  83         } catch (Exception e) { 84             e.printStackTrace(); 85  86         } 87     } 88  89     /** 90      * @description 将xml字符串转换成map 91      * @param xml 92      * @return Map 93      */ 94     public static Map readStringXmlOut(String xml) { 95         Map map = new HashMap(); 96         Document doc = null; 97         try { 98             // 将字符串转为XML 99             doc = DocumentHelper.parseText(xml); 
100             // 获取根节点101             Element rootElt = doc.getRootElement(); 
102             // 拿到根节点的名称103             System.out.println("根节点：" + rootElt.getName()); 
104 105             // 获取根节点下的子节点head106             Iterator iter = rootElt.elementIterator("head"); 
107             // 遍历head节点108             while (iter.hasNext()) {109 110                 Element recordEle = (Element) iter.next();111                 // 拿到head节点下的子节点title值112                 String title = recordEle.elementTextTrim("title"); 
113                 System.out.println("title:" + title);114                 map.put("title", title);115                 // 获取子节点head下的子节点script116                 Iterator iters = recordEle.elementIterator("script"); 
117                 // 遍历Header节点下的Response节点118                 while (iters.hasNext()) {119                     Element itemEle = (Element) iters.next();120                     // 拿到head下的子节点script下的字节点username的值121                     String username = itemEle.elementTextTrim("username"); 
122                     String password = itemEle.elementTextTrim("password");123 124                     System.out.println("username:" + username);125                     System.out.println("password:" + password);126                     map.put("username", username);127                     map.put("password", password);128                 }129             }130 131             //获取根节点下的子节点body132             Iterator iterss = rootElt.elementIterator("body"); 
133             // 遍历body节点134             while (iterss.hasNext()) {135                 Element recordEless = (Element) iterss.next();136                 // 拿到body节点下的子节点result值137                 String result = recordEless.elementTextTrim("result"); 
138                 System.out.println("result:" + result);139                 // 获取子节点body下的子节点form140                 Iterator itersElIterator = recordEless.elementIterator("form"); 
141                 // 遍历Header节点下的Response节点142                 while (itersElIterator.hasNext()) {143                     Element itemEle = (Element) itersElIterator.next();144                     // 拿到body下的子节点form下的字节点banlce的值145                     String banlce = itemEle.elementTextTrim("banlce"); 
146                     String subID = itemEle.elementTextTrim("subID");147 148                     System.out.println("banlce:" + banlce);149                     System.out.println("subID:" + subID);150                     map.put("result", result);151                     map.put("banlce", banlce);152                     map.put("subID", subID);153                 }154             }155         } catch (DocumentException e) {156             e.printStackTrace();157         } catch (Exception e) {158             e.printStackTrace();159         }160         return map;161     }162 163     public static void main(String[] args) {164 165         // 下面是需要解析的xml字符串例子166         String xmlString = "<html>" + "<head>" + "<title>dom4j解析一个例子</title>"167                 + "<script>" + "<username>yangrong</username>"168                 + "<password>123456</password>" + "</script>" + "</head>"169                 + "<body>" + "<result>0</result>" + "<form>"170                 + "<banlce>1000</banlce>" + "<subID>36242519880716</subID>"171                 + "</form>" + "</body>" + "</html>";172 173         /*174          * Test2 test = new Test2(); test.readStringXml(xmlString);175          */176         Map map = readStringXmlOut(xmlString);177         Iterator iters = map.keySet().iterator();178         while (iters.hasNext()) {179             String key = iters.next().toString(); // 拿到键180             String val = map.get(key).toString(); // 拿到值181             System.out.println(key + "=" + val);182         }183     }184 185 }实例二：

 1 /** 2  * 解析包含有DB连接信息的XML文件 3  * 格式必须符合如下规范： 4  * 1. 最多三级，每级的node名称自定义； 5  * 2. 二级节点支持节点属性，属性将被视作子节点； 6  * 3. CDATA必须包含在节点中，不能单独出现。 7  * 8  * 示例1——三级显示： 9  * <db-connections>10  *         <connection>11  *            <name>DBTest</name>12  *            <jndi></jndi>13  *            <url>14  *                <![CDATA[jdbc:mysql://localhost:3306/db_test?useUnicode=true&characterEncoding=UTF8]]>15  *             </url>16  *            <driver>org.gjt.mm.mysql.Driver</driver>17  *             <user>test</user>18  *            <password>test2012</password>19  *            <max-active>10</max-active>20  *            <max-idle>10</max-idle>21  *            <min-idle>2</min-idle>22  *            <max-wait>10</max-wait>23  *            <validation-query>SELECT 1+1</validation-query>24  *         </connection>25  * </db-connections>26  *27  * 示例2——节点属性：28  * <bookstore>29  *         <book category="cooking">30  *            <title lang="en">Everyday Italian</title>31  *            <author>Giada De Laurentiis</author>32  *            <year>2005</year>33  *            <price>30.00</price>34  *         </book>35  *36  *         <book category="children" title="Harry Potter" author="J K. Rowling" year="2005" price="$29.9"/>37  * </bookstore>38  *39  * @param configFile40  * @return41  * @throws Exception42  */43 public static List<Map<String, String>> parseDBXML(String configFile) throws Exception {44     List<Map<String, String>> dbConnections = new ArrayList<Map<String, String>>();45     InputStream is = Parser.class.getResourceAsStream(configFile);46     SAXReader saxReader = new SAXReader();47     Document document = saxReader.read(is);48     Element connections = document.getRootElement();49 50     Iterator<Element> rootIter = connections.elementIterator();51     while (rootIter.hasNext()) {52         Element connection = rootIter.next();53         Iterator<Element> childIter = connection.elementIterator();54         Map<String, String> connectionInfo = new HashMap<String, String>();55         List<Attribute> attributes = connection.attributes();56         for (int i = 0; i < attributes.size(); ++i) { // 添加节点属性57             connectionInfo.put(attributes.get(i).getName(), attributes.get(i).getValue());58         }59         while (childIter.hasNext()) { // 添加子节点60             Element attr = childIter.next();61             connectionInfo.put(attr.getName().trim(), attr.getText().trim());62         }63         dbConnections.add(connectionInfo);64     }65 66     return dbConnections;67 }

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