java如何解析/读取xml文件
本文实例为大家分享了java解析/读取xml文件的方法，供大家参考，具体内容如下
XML文件
<?xmlversion="1.0"?> <students> <student> <name>John</name> <grade>B</grade> <age>12</age> </student> <student> <name>Mary</name> <grade>A</grade> <age>11</age> </student> <student> <name>Simon</name> <grade>A</grade> <age>18</age> </student> </students>
Java代码:
packagenet.viralpatel.java.xmlparser;
importjava.io.File;
importjavax.xml.parsers.DocumentBuilder;
importjavax.xml.parsers.DocumentBuilderFactory;
importorg.w3c.dom.Document;
importorg.w3c.dom.Element;
importorg.w3c.dom.Node;
importorg.w3c.dom.NodeList;
publicclassXMLParser{
publicvoidgetAllUserNames(StringfileName){
try{
DocumentBuilderFactorydbf=DocumentBuilderFactory.newInstance();
DocumentBuilderdb=dbf.newDocumentBuilder();
Filefile=newFile(fileName);
if(file.exists()){
Documentdoc=db.parse(file);
ElementdocEle=doc.getDocumentElement();
//Printrootelementofthedocument
System.out.println("Rootelementofthedocument:"
+docEle.getNodeName());
NodeListstudentList=docEle.getElementsByTagName("student");
//Printtotalstudentelementsindocument
System.out
.println("Totalstudents:"+studentList.getLength());
if(studentList!=null&&studentList.getLength()>0){
for(inti=0;i<studentList.getLength();i++){
Nodenode=studentList.item(i);
if(node.getNodeType()==Node.ELEMENT_NODE){
System.out
.println("=====================");
Elemente=(Element)node;
NodeListnodeList=e.getElementsByTagName("name");
System.out.println("Name:"
+nodeList.item(0).getChildNodes().item(0)
.getNodeValue());
nodeList=e.getElementsByTagName("grade");
System.out.println("Grade:"
+nodeList.item(0).getChildNodes().item(0)
.getNodeValue());
nodeList=e.getElementsByTagName("age");
System.out.println("Age:"
+nodeList.item(0).getChildNodes().item(0)
.getNodeValue());
}
}
}else{
System.exit(1);
}
}
}catch(Exceptione){
System.out.println(e);
}
}
publicstaticvoidmain(String[]args){
XMLParserparser=newXMLParser();
parser.getAllUserNames("c:\\test.xml");
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助。