与应用DOM、SAX、JAXP机制来剖析xml比拟,DOM4J 表现更优秀,具有机能优秀、功能强大和极度易用运用的特性,只需晓得DOM基本概念,就能够经由过程dom4j的api文档来剖析xml。dom4j是一套开源的api。现实项目中,每每挑选dom4j来作为剖析xml的利器。
先来看看dom4j中对应XML的DOM树竖立的继续关联
针对于XML范例定义,对应于图2-1列出的内容,dom4j供应了以下完成:
同时,dom4j的NodeType罗列完成了XML范例中定义的node范例。云云能够在遍历xml文档的时刻经由过程常量来推断节点范例了。
经常使用API
class org.dom4j.io.SAXReader
read 供应多种读取xml文件的体式格局,返回一个Domcument对象
interface org.dom4j.Document
iterator 运用此法猎取node
getRootElement 猎取根节点
interface org.dom4j.Node
getName 猎取node名字,比方猎取根节点称号为bookstore
getNodeType 猎取node范例常量值,比方猎取到bookstore范例为1——Element
getNodeTypeName 猎取node范例称号,比方猎取到的bookstore范例称号为Element
interface org.dom4j.Element
attributes 返回该元素的属性列表
attributeValue 依据传入的属性名猎取属性值
elementIterator 返回包括子元素的迭代器
elements 返回包括子元素的列表
interface org.dom4j.Attribute
getName 猎取属性名
getValue 猎取属性值
interface org.dom4j.Text
getText 猎取Text节点值
interface org.dom4j.CDATA
getText 猎取CDATA Section值
interface org.dom4j.Comment
getText 猎取解释
实例一:
1 //先到场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: 剖析xml字符串 15 * @author 无处不在 16 * @date 2012-11-20 下昼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 // 读取并剖析XML文档 26 // SAXReader就是一个管道,用一个流的体式格局,把xml文件读出来 27 // 28 // SAXReader reader = new SAXReader(); //User.hbm.xml示意你要剖析的xml文档 29 // Document document = reader.read(new File("User.hbm.xml")); 30 // 下面的是经由过程剖析xml字符串的 31 doc = DocumentHelper.parseText(xml); // 将字符串转为XML 32 33 Element rootElt = doc.getRootElement(); // 猎取根节点 34 System.out.println("根节点:" + rootElt.getName()); // 拿到根节点的称号 35 36 Iterator iter = rootElt.elementIterator("head"); // 猎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"); // 猎取子节点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"); ///猎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"); // 猎取子节点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 // 猎取根节点101 Element rootElt = doc.getRootElement(); 102 // 拿到根节点的称号103 System.out.println("根节点:" + rootElt.getName()); 104 105 // 猎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 // 猎取子节点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 //猎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 // 猎取子节点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 // 下面是须要剖析的xml字符串例子166 String xmlString = "<html>" + "<head>" + "<title>dom4j剖析一个例子</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 * 剖析包括有DB衔接信息的XML文件 3 * 花样必需相符以下范例: 4 * 1. 最多三级,每级的node称号自定义; 5 * 2. 二级节点支撑节点属性,属性将被视作子节点; 6 * 3. CDATA必需包括在节点中,不能零丁涌现。 7 * 8 * 示例1——三级显现: 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) { // 增加节点属性57 connectionInfo.put(attributes.get(i).getName(), attributes.get(i).getValue());58 }59 while (childIter.hasNext()) { // 增加子节点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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