DOM解析xml文件
首先需要下载插件jdom.jar进入项目
导入jdom.jar插件之后一切就简单了,这里测试给一个简单xml文件
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<?xml version="1.0" encoding="UTF-8"?> <student-info> <student id="10031" name="admin"> <name id="王明"> <height>165</height> <weight>100</weight> </name> <age>24</age> <address>上海</address> </student> <student id="10032" name="user"> <name id="李珊" age="23"> <height>165</height> <weight>100</weight> </name> <age>25</age> <address>北京</address> </student> </student-info>
创建针对此xml文件的解析器
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package one; import java.io.IOException; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.w3c.dom.*; import org.xml.sax.SAXException; public class DOMPrinter { public static void printNode(Node node){ short nodetype=node.getNodeType(); switch(nodetype){ case Node.PROCESSING_INSTRUCTION_NODE: System.out.println("指令节点:<"+node.getNodeName()+""+node.getNodeValue()+">"); break; case Node.ELEMENT_NODE: System.out.println("元素节点:<"+node.getNodeName()+">"); NamedNodeMap attrs=node.getAttributes(); int attrNum=attrs.getLength();; for(int i=0;i<attrNum;i++){ Node attr=attrs.item(i); System.out.println(""+attr.getNodeName()+"="+attr.getNodeValue()+""); } break; case Node.TEXT_NODE: if(node.getNodeValue()!=null&&node.getNodeValue().intern().length()!=0){ System.out.println("文本节点:"+node.getNodeValue()); break; } case Node.DOCUMENT_NODE: System.out.println("文档节点"); break; default: System.out.println("位置节点"); break; } Node child=node.getFirstChild(); while(child!=null){ printNode(child); child=child.getNextSibling(); } if(node.getNodeType()==Node.ELEMENT_NODE){ System.out.println("节点结束:"+"</"+node.getNodeName()+">"); } } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();//建立dom解析的工厂实例 DocumentBuilder builder; try { //从工厂实例中获得解析器 builder = factory.newDocumentBuilder(); Document doc=builder.parse("D:\\workspqce2013\\DOMJX-XML\\src\\Student.xml");//将需要解析的xml文件导入dom解析器 //获取需要解析的xml文件元素 printNode(doc); } catch (ParserConfigurationException e) { // TODO Auto-generated catch block e.printStackTrace(); }catch (SAXException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
另给出一个针对各种xml都适用的解析器
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package one; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.w3c.dom.*; public class TraverseXML { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub try{ DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();//建立dom解析的工厂实例 DocumentBuilder builder=factory.newDocumentBuilder();//从工厂实例中获得解析器 Document doc=builder.parse("D:\\workspqce2013\\DOMJX-XML\\src\\Student.xml");//将需要解析的xml文件导入dom解析器 //获取需要解析的xml文件元素 NodeList nl=doc.getElementsByTagName("student"); for(int i=0;i<nl.getLength();i++){ Element nod=(Element)nl.item(i); //System.out.println("id:"+ nod.getAttribute("id")); //System.out.println("name:"+nod.getAttribute("name")); String name=nod.getElementsByTagName("name").item(0).getFirstChild().getNodeValue(); String age=nod.getElementsByTagName("age").item(0).getFirstChild().getNodeValue(); String address=nod.getElementsByTagName("address").item(0).getFirstChild().getNodeValue(); //System.out.println(name); //System.out.println(age); //System.out.println(address); Element nod2=(Element)nod.getElementsByTagName("name").item(0); String id=nod2.getAttribute("id"); String age2=nod2.getAttribute("age"); if(nod2.getElementsByTagName("height").item(0)!=null){ String height=nod2.getElementsByTagName("height").item(0).getFirstChild().getNodeValue(); System.out.println(height); }else{ System.out.println("dddddddddddd"); } if(age2!=""&&age2!=null){ System.out.println(id); System.out.println(age2); }else{ System.out.println(id); System.out.println("没有此属性"); } } }catch(Exception e){ e.printStackTrace(); } } }