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DOM、JDOM、DOM4J解析XML范例

发布时间： 2012-08-21 13:00:21 作者： rapoo

DOM、JDOM、DOM4J解析XML实例

一、DOM方式

原始name.xml

Html代码?
  1. <?xml?version="1.0"?encoding="GB2312"?standalone="no"?><学生花名册>??
  2. ????<学生?性别="男">??
  3. ????????<姓名>李华</姓名>??
  4. ????????<年龄>14</年龄>??
  5. ????</学生>??
  6. ????<学生?性别="男">??
  7. ????????<姓名>张三</姓名>??
  8. ????????<年龄>16</年龄>??
  9. ????</学生>??
  10. ????<学生?性别="女">??
  11. ????????<姓名>王娟</姓名>??
  12. ????????<年龄>18</年龄>??
  13. ????</学生>??
  14. </学生花名册>??

数据模型Student.java

Java代码?
  1. package?com.upcgrid.dom;??
  2. ??
  3. public?class?Student?{??
  4. ????private?String?name;??
  5. ????private?String?sex;??
  6. ????private?int?age;??
  7. ??
  8. ????public?String?getName()?{??
  9. ????????return?name;??
  10. ????}??
  11. ??
  12. ????public?void?setName(String?name)?{??
  13. ????????this.name?=?name;??
  14. ????}??
  15. ??
  16. ????public?String?getSex()?{??
  17. ????????return?sex;??
  18. ????}??
  19. ??
  20. ????public?void?setSex(String?sex)?{??
  21. ????????this.sex?=?sex;??
  22. ????}??
  23. ??
  24. ????public?int?getAge()?{??
  25. ????????return?age;??
  26. ????}??
  27. ??
  28. ????public?void?setAge(int?age)?{??
  29. ????????this.age?=?age;??
  30. ????}??
  31. }??

DOM方式解析xml文档示例程序

Java代码?
  1. package?com.upcgrid.dom;??
  2. ??
  3. import?java.io.FileOutputStream;??
  4. import?java.io.IOException;??
  5. import?java.io.OutputStreamWriter;??
  6. import?java.util.Vector;??
  7. ??
  8. import?javax.xml.parsers.DocumentBuilder;??
  9. import?javax.xml.parsers.DocumentBuilderFactory;??
  10. import?javax.xml.parsers.ParserConfigurationException;??
  11. import?javax.xml.transform.OutputKeys;??
  12. import?javax.xml.transform.Transformer;??
  13. import?javax.xml.transform.TransformerException;??
  14. import?javax.xml.transform.TransformerFactory;??
  15. import?javax.xml.transform.dom.DOMSource;??
  16. import?javax.xml.transform.stream.StreamResult;??
  17. ??
  18. import?org.w3c.dom.Document;??
  19. import?org.w3c.dom.Element;??
  20. import?org.w3c.dom.NodeList;??
  21. import?org.w3c.dom.Text;??
  22. import?org.xml.sax.SAXException;??
  23. ??
  24. /**?
  25. ?*??
  26. ?*?@author?shijin?原始DOM解析XML方式?
  27. ?*??
  28. ?*/??
  29. public?class?DOMTest?{??
  30. ????public?static?void?main(String[]?args)?throws?ParserConfigurationException,??
  31. ????????????SAXException,?IOException,?TransformerException?{??
  32. ????????DOMTest?test?=?new?DOMTest();??
  33. ????????test.deleteElement("name.xml",?"女");??
  34. ????????Vector<Student>?stus?=?test.changeXMLToModel("name.xml");??
  35. ????????for?(Student?stu?:?stus)?{??
  36. ????????????System.out.print(stu.getName()?+?"?"?+?stu.getSex()?+?"?"??
  37. ????????????????????+?stu.getAge()?+?"\n");??
  38. ????????}??
  39. ????????//?输出：??
  40. ????????//?李华?男?14??
  41. ????????//?张三?男?16??
  42. ????????test.createDocument("name2.xml",?stus);??
  43. ????}??
  44. ??
  45. ????/**?
  46. ?????*?show?根据vector中的student对象创建xml文档?
  47. ?????*??
  48. ?????*?@param?filename?
  49. ?????*????????????要创建的文档名?
  50. ?????*?@throws?ParserConfigurationException?
  51. ?????*?@throws?SAXException?
  52. ?????*?@throws?IOException?
  53. ?????*?@throws?TransformerException?
  54. ?????*/??
  55. ????public?void?createDocument(String?filename,?Vector<Student>?stus)??
  56. ????????????throws?ParserConfigurationException,?SAXException,?IOException,??
  57. ????????????TransformerException?{??
  58. ????????//?得到DOM解析器的工厂实例??
  59. ????????DocumentBuilderFactory?dbf?=?DocumentBuilderFactory.newInstance();??
  60. ????????//?从DOM工厂获取DOM解析器??
  61. ????????DocumentBuilder?builder?=?dbf.newDocumentBuilder();??
  62. ????????//?创建document对象??
  63. ????????Document?doc?=?builder.newDocument();??
  64. ????????Element?root?=?doc.createElement("学生花名册");//?创建根元素??
  65. ????????doc.appendChild(root);//?添加根元素??
  66. ????????for?(Student?stu?:?stus)?{??
  67. ????????????Element?stuElement?=?doc.createElement("学生");??
  68. ????????????stuElement.setAttribute("性别",?stu.getSex());??
  69. ????????????Element?nameElement?=?doc.createElement("姓名");??
  70. ????????????Text?nameText?=?doc.createTextNode(stu.getName());??
  71. ????????????nameElement.appendChild(nameText);??
  72. ????????????Element?ageElement?=?doc.createElement("年龄");??
  73. ????????????Text?ageText?=?doc.createTextNode(String.valueOf(stu.getAge()));??
  74. ????????????ageElement.appendChild(ageText);??
  75. ????????????stuElement.appendChild(nameElement);??
  76. ????????????stuElement.appendChild(ageElement);??
  77. ????????????root.appendChild(stuElement);??
  78. ????????}??
  79. ????????FileOutputStream?fos?=?new?FileOutputStream(filename);??
  80. ????????OutputStreamWriter?ow?=?new?OutputStreamWriter(fos);??
  81. ????????//?保存xml文件??
  82. ????????DOMSource?doms?=?new?DOMSource(doc);??
  83. ????????//?创建结果输出流??
  84. ????????StreamResult?result?=?new?StreamResult(ow);??
  85. ????????//?得到转换工厂实例??
  86. ????????TransformerFactory?transFac?=?TransformerFactory.newInstance();??
  87. ????????//?得到转换器实例??
  88. ????????Transformer?trans?=?transFac.newTransformer();??
  89. ????????//?转化器设置输出文档的编码方式??
  90. ????????trans.setOutputProperty(OutputKeys.ENCODING,?"GB2312");??
  91. ????????//设置支持缩进??
  92. ????????trans.setOutputProperty(OutputKeys.INDENT,?"yes");??
  93. ????????//?将文档源转换到结果输出流??
  94. ????????trans.transform(doms,?result);??
  95. ????}??
  96. ??
  97. ????/**?
  98. ?????*?show?读取指定XML文档并将其对象化?
  99. ?????*??
  100. ?????*?@param?filename?
  101. ?????*?@return?存储Student对象的vector?
  102. ?????*?@throws?ParserConfigurationException?
  103. ?????*?@throws?SAXException?
  104. ?????*?@throws?IOException?
  105. ?????*/??
  106. ????public?Vector<Student>?changeXMLToModel(String?filename)??
  107. ????????????throws?ParserConfigurationException,?SAXException,?IOException?{??
  108. ????????//?得到DOM解析器的工厂实例??
  109. ????????DocumentBuilderFactory?dbf?=?DocumentBuilderFactory.newInstance();??
  110. ????????//?从DOM工厂获取DOM解析器??
  111. ????????DocumentBuilder?builder?=?dbf.newDocumentBuilder();??
  112. ????????//?解析xml文档，获得document对象，即DOM树??
  113. ????????Document?doc?=?builder.parse(filename);??
  114. ????????//?获取根节点??
  115. ????????Element?root?=?doc.getDocumentElement();??
  116. ????????//?获取根节点的子节点中名字为"学生"的节点列表??
  117. ????????NodeList?stuNodes?=?root.getElementsByTagName("学生");??
  118. ????????Vector<Student>?students?=?new?Vector<Student>();??
  119. ????????//?遍历<学生>节点??
  120. ????????for?(int?i?=?0;?i?<?stuNodes.getLength();?i++)?{??
  121. ????????????//?获取一个学生节点??
  122. ????????????Element?stuNode?=?(Element)?stuNodes.item(i);??
  123. ????????????//?创建一个学生对象??
  124. ????????????Student?stu?=?new?Student();??
  125. ????????????stu.setSex(stuNode.getAttribute("性别"));??
  126. ????????????//?获取<学生>节点的子节点中名字为"姓名"的节点列表??
  127. ????????????NodeList?nameNodes?=?stuNode.getElementsByTagName("姓名");??
  128. ????????????//?取得第一个姓名??
  129. ????????????Element?nameNode?=?(Element)?nameNodes.item(0);??
  130. ????????????stu.setName(nameNode.getTextContent());??
  131. ????????????//?获取<学生>节点的子节点中名字为"年龄"的节点列表??
  132. ????????????NodeList?ageNodes?=?stuNode.getElementsByTagName("年龄");??
  133. ????????????//?取得第一个年龄??
  134. ????????????Element?ageNode?=?(Element)?ageNodes.item(0);??
  135. ????????????stu.setAge(Integer.parseInt(ageNode.getTextContent()));??
  136. ????????????students.add(stu);??
  137. ????????}??
  138. ????????return?students;??
  139. ????}??
  140. ??
  141. ????/**?
  142. ?????*?show?删除指定名为filename的xml文档中学生结点的性别属性为tagname的结点?
  143. ?????*??
  144. ?????*?@param?filename?
  145. ?????*?@param?tagname?
  146. ?????*?@throws?ParserConfigurationException?
  147. ?????*?@throws?SAXException?
  148. ?????*?@throws?IOException?
  149. ?????*?@throws?TransformerException?
  150. ?????*/??
  151. ????public?void?deleteElement(String?filename,?String?tagname)??
  152. ????????????throws?ParserConfigurationException,?SAXException,?IOException,??
  153. ????????????TransformerException?{??
  154. ????????//?得到DOM解析器的工厂实例??
  155. ????????DocumentBuilderFactory?dbf?=?DocumentBuilderFactory.newInstance();??
  156. ????????//?从DOM工厂获取DOM解析器??
  157. ????????DocumentBuilder?builder?=?dbf.newDocumentBuilder();??
  158. ????????//?解析xml文档，获得document对象，即DOM树??
  159. ????????Document?doc?=?builder.parse(filename);??
  160. ????????//?找到删除节点??
  161. ????????NodeList?stuNodes?=?doc.getElementsByTagName("学生");??
  162. ????????for?(int?i?=?0;?i?<?stuNodes.getLength();?i++)?{??
  163. ????????????Element?stuElement?=?(Element)?stuNodes.item(i);??
  164. ????????????String?sex?=?stuElement.getAttribute("性别");??
  165. ????????????if?(sex.equals(tagname))?{??
  166. ????????????????stuElement.getParentNode().removeChild(stuElement);??
  167. ????????????}??
  168. ????????}??
  169. ????????//?保存xml文件??
  170. ????????DOMSource?doms?=?new?DOMSource(doc);??
  171. ????????//?创建结果输出流??
  172. ????????StreamResult?result?=?new?StreamResult(new?FileOutputStream(filename));??
  173. ????????//?得到转换工厂实例??
  174. ????????TransformerFactory?transFac?=?TransformerFactory.newInstance();??
  175. ????????//?得到转换器实例??
  176. ????????Transformer?trans?=?transFac.newTransformer();??
  177. ????????//?转化器设置输出文档的编码方式??
  178. ????????trans.setOutputProperty(OutputKeys.ENCODING,?"GB2312");??
  179. ????????//?将文档源转换到结果输出流??
  180. ????????trans.transform(doms,?result);??
  181. ????}??
  182. }??

输出：
李华 男 14
张三 男 16
结果name.xml

Java代码?
  1. <?xml?version="1.0"?encoding="GB2312"?standalone="no"?><学生花名册>??
  2. ????<学生?性别="男">??
  3. ????????<姓名>李华</姓名>??
  4. ????????<年龄>14</年龄>??
  5. ????</学生>??
  6. ????<学生?性别="男">??
  7. ????????<姓名>张三</姓名>??
  8. ????????<年龄>16</年龄>??
  9. ????</学生>??
  10. ??????
  11. </学生花名册>??

name2.xml

Java代码?
  1. <?xml?version="1.0"?encoding="GB2312"?standalone="no"?>??
  2. <学生花名册>??
  3. <学生?性别="男">??
  4. <姓名>李华</姓名>??
  5. <年龄>14</年龄>??
  6. </学生>??
  7. <学生?性别="男">??
  8. <姓名>张三</姓名>??
  9. <年龄>16</年龄>??
  10. </学生>??
  11. </学生花名册>??
二、JDOM方式

HD.xml

Html代码?
  1. <?xml?version="1.0"?encoding="UTF-8"?>??
  2. <HD>??
  3. ??<disk?name="C">??
  4. ????<capacity>8G</capacity>??
  5. ????<directories>200</directories>??
  6. ????<files>1580</files>??
  7. ??</disk>??
  8. ??
  9. ??<disk?name="D">??
  10. ????<capacity>10G</capacity>??
  11. ????<directories>500</directories>??
  12. ????<files>3000</files>??
  13. ??</disk>??
  14. </HD>???

JDOM解析XML文档示例

Html代码?
  1. package?com.upcgrid.jdom;??
  2. ??
  3. import?java.io.IOException;??
  4. import?java.util.List;??
  5. import?org.jdom.Document;??
  6. import?org.jdom.Element;??
  7. import?org.jdom.JDOMException;??
  8. import?org.jdom.input.SAXBuilder;??
  9. ??
  10. public?class?JDOMTest?{??
  11. ????public?static?void?main(String[]?args)?throws?JDOMException,?IOException?{??
  12. ????????//?获得JDOM以SAX方式处理XML文档的构造器??
  13. ????????SAXBuilder?saxb?=?new?SAXBuilder();??
  14. ????????//?通过SAX构造器获得XML文档对象??
  15. ????????Document?doc?=?saxb.build(JDOMTest.class.getClassLoader()??
  16. ????????????????.getResourceAsStream("test.xml"));??
  17. ????????//?获取根元素HD??
  18. ????????Element?root?=?doc.getRootElement();??
  19. ????????//?取名字为disk的所有元素??
  20. ????????List<Element>?list?=?root.getChildren("disk");??
  21. ????????for?(int?i?=?0;?i?<?list.size();?i++)?{??
  22. ????????????//取得第i个disk节点??
  23. ????????????Element?diskElement?=?(Element)?list.get(i);??
  24. ????????????//取得disk属性name??
  25. ????????????String?name?=?diskElement.getAttributeValue("name");??
  26. ????????????//?取disk子元素capacity的内容??
  27. ????????????String?capacity?=?diskElement.getChildText("capacity");??
  28. ????????????String?directories?=?diskElement.getChildText("directories");??
  29. ????????????String?files?=?diskElement.getChildText("files");??
  30. ????????????System.out.println("磁盘信息:");??
  31. ????????????System.out.println("分区盘符:"?+?name);??
  32. ????????????System.out.println("分区容量:"?+?capacity);??
  33. ????????????System.out.println("目录数:"?+?directories);??
  34. ????????????System.out.println("文件数:"?+?files);??
  35. ????????????System.out.println("-----------------------------------");??
  36. ????????}??
  37. ????}??
  38. }??

输出结果：
磁盘信息:
分区盘符:C
分区容量:8G
目录数:200
文件数:1580
-----------------------------------
磁盘信息:
分区盘符:D
分区容量:10G
目录数:500
文件数:3000
-----------------------------------

三、DOM4J方式

User.hbm.xml

Html代码?
  1. <?xml?version="1.0"?encoding="UTF-8"?>??
  2. <hibernate-mapping>??
  3. ????<class?name="com.upcgrid.User"?table="t_user">??
  4. ????????<property?name="username">aaa</property>??
  5. ????????<property?name="password">bbb</property>??
  6. ????</class>>??
  7. </hibernate-mapping>??

DOM4J解析XML示例

Java代码?
  1. package?com.upcgrid.dom4j;??
  2. ??
  3. import?java.io.File;??
  4. import?java.io.FileWriter;??
  5. import?java.io.IOException;??
  6. import?java.util.Iterator;??
  7. import?java.util.List;??
  8. ??
  9. import?org.dom4j.Attribute;??
  10. import?org.dom4j.Document;??
  11. import?org.dom4j.DocumentException;??
  12. import?org.dom4j.DocumentHelper;??
  13. import?org.dom4j.Element;??
  14. import?org.dom4j.Node;??
  15. import?org.dom4j.io.OutputFormat;??
  16. import?org.dom4j.io.SAXReader;??
  17. import?org.dom4j.io.XMLWriter;??
  18. ??
  19. public?class?DOM4JTest?{??
  20. ????public?static?void?main(String[]?args)?{??
  21. ????????//获得DOM4J以SAX方式处理XML文档的管道??
  22. ????????SAXReader?reader?=?new?SAXReader();??
  23. ????????try?{??
  24. ????????????//通过管道获得XML文档对象??
  25. ????????????Document?document?=?reader.read(new?File("User.hbm.xml"));??
  26. ????????????//获取根节点??
  27. ????????????Element?root?=?document.getRootElement();??
  28. ????????????System.out.println(root.getName());??
  29. ??????????????
  30. ????????????Element?element?=?null;??
  31. ????????????//遍历根节点下的节点??
  32. ????????????for(Iterator<Element>?i?=?root.elementIterator();i.hasNext();){??
  33. ????????????????//根节点的子节点??
  34. ????????????????element?=?(Element)?i.next();??
  35. ????????????????System.out.println(element.getName());??
  36. ????????????????//遍历节点属性??
  37. ????????????????for(Iterator<Attribute>?j?=?element.attributeIterator();j.hasNext();){??
  38. ????????????????????Attribute?attr?=?(Attribute)j.next();??
  39. ????????????????????System.out.println(attr.getName()+":"+attr.getValue());??
  40. ????????????????}??
  41. ????????????????//遍历名为"property"的节点??
  42. ????????????????for(Iterator<Element>?k?=?element.elementIterator("property");k.hasNext();){??
  43. ????????????????????Element?e1?=?(Element)k.next();??
  44. ????????????????????System.out.println(e1.getData());??
  45. ????????????????}??
  46. ????????????}??
  47. ??????????????
  48. ????????????//通过Xpath的方式寻找节点??
  49. ????????????List<Node>?list?=?document.selectNodes("//hibernate-mapping/class/property");??
  50. ????????????for(Node?n:?list){??
  51. ????????????????String?name?=?n.valueOf("@name");??
  52. ????????????????System.out.println(n.getName()+"?@name:"+name);??
  53. ????????????}??
  54. ????????????//只拿第一个??
  55. ????????????Node?node?=?document.selectSingleNode("//hibernate-mapping/class");??
  56. ????????????String?name?=?node.valueOf("@name");??
  57. ????????????String?table?=?node.valueOf("@table");??
  58. ????????????System.out.println(node.getName()+"?@name:"+name+",@table:"+table);??
  59. ????????????createDocument();??
  60. ????????}?catch?(DocumentException?e)?{??
  61. ????????????e.printStackTrace();??
  62. ????????}??
  63. ????}??
  64. ??????
  65. ????public?static?Document?createDocument(){??
  66. ????????//创建document对象??
  67. ????????Document?document?=?DocumentHelper.createDocument();??
  68. ????????Element?root?=?document.addElement("hibernate-mapping");??
  69. ????????//链式编程??
  70. ????????Element?classElement?=?root.addElement("class")??
  71. ????????????.addAttribute("name",?"com.upcgrid.User")??
  72. ????????????.addAttribute("table",?"t_user");??
  73. ????????classElement.addElement("property").addAttribute("name",?"username").addText("aaa");??
  74. ????????classElement.addElement("Property").addAttribute("name",?"password").addText("bbb");;??
  75. ????????try?{??
  76. ????????????FileWriter?out?=?new?FileWriter("User1.hbm.xml");??
  77. ????????????document.write(out);??
  78. ????????????out.flush();??
  79. ????????????out.close();??
  80. ????????}?catch?(IOException?e)?{??
  81. ????????????e.printStackTrace();??
  82. ????????}??
  83. ????????try?{??
  84. ????????????//设定美化格式??
  85. ????????????OutputFormat?format?=?OutputFormat.createPrettyPrint();??
  86. ????????????XMLWriter?writer?=?new?XMLWriter(new?FileWriter("User2.hbm.xml"),format);??
  87. ????????????writer.write(document);??
  88. ????????????writer.close();??
  89. ????????????//缩减格式??
  90. ????????}?catch?(IOException?e)?{??
  91. ????????????e.printStackTrace();??
  92. ????????}??
  93. ????????return?document;??
  94. ????}??
  95. }??

输出：
hibernate-mapping
class
name:com.upcgrid.User
table:t_user
aaa
bbb
property @name:username
property @name:password
class @name:com.upcgrid.User,@table:t_user
User.hbm.xml

Html代码?
  1. <?xml?version="1.0"?encoding="UTF-8"?>??
  2. <hibernate-mapping><class?name="com.upcgrid.User"?table="t_user"><property?name="username">aaa</property><Property?name="password">bbb</Property></class></hibernate-mapping>??

User2.hbm.xml

Html代码?
  1. <?xml?version="1.0"?encoding="UTF-8"?>??
  2. ??
  3. <hibernate-mapping>??
  4. ??<class?name="com.upcgrid.User"?table="t_user">??
  5. ????<property?name="username">aaa</property>??
  6. ????<Property?name="password">bbb</Property>??
  7. ??</class>??
  8. </hibernate-mapping>
整理的不错 2 楼 hyj0903 2012-06-21 性能方面呢?比如说用这此方法生成一棵树，XML文件大小2M. 3 楼 enen1982 2012-06-21 dom4j当然强大，支付xquery表达式和xpath寻止，方便多了

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