testdomparser.java

xml的使用的例子

import org.w3c.dom.*;
import java.io.*;
import java.util.*;
import javax.xml.parsers.*;
//需要下载xercesImpl.jar,才能提供

public class TestDOMParser {
    public static void main(String[] args) {    	
        TestDOMParser tp = new TestDOMParser();        
        tp.parseXMLFile("student.xml");
    }
    public void parseXMLFile(String fileName) {
        try {
		    DocumentBuilderFactory dbf = 
				DocumentBuilderFactory.newInstance() ;
            DocumentBuilder db = dbf.newDocumentBuilder();

			//解析文件名传入
		    Document doc = db.parse(fileName);
	      //获得Documet,与xml建立对象匹配
	        //Document  doc = parser.getDocument();
	        
			//获得根节点StudentInfo
            Element elmtInfo = doc.getDocumentElement();
            
		//得到所有student节点,节点集合
            NodeList nlStudent = elmtInfo.getElementsByTagName("student");
            
            System.out.println("XML文件开始解析");

			//循环输出每一个学生成绩
			
            for (int i = 0; i < nlStudent.getLength(); i++) {
				
				//当前student元素
                Element elmtStudent = (Element) nlStudent.item(i);
    //Name/sex/lesson节点清单
                NodeList nlCurrent = elmtStudent.getElementsByTagName("name");
                System.out.println("姓名:" +
nlCurrent.item(0).getFirstChild().getNodeValue());

                nlCurrent = elmtStudent.getElementsByTagName("sex");
                System.out.println("性别:" +
 nlCurrent.item(0).getFirstChild().getNodeValue());
//取得Lesson节点,不是一个,需要循环
                nlCurrent = elmtStudent.getElementsByTagName("lesson");

                for (int j = 0; j < nlCurrent.getLength(); j++) {
       //Lesson这个元素的对应         	
                    Element elmtLesson = (Element) nlCurrent.item(j);
                    NodeList nlLesson = elmtLesson.getElementsByTagName("lessonName");
                    System.out.print(nlLesson.item(0).getFirstChild().
                                     getNodeValue());
                    System.out.print(":");
                    nlLesson = elmtLesson.getElementsByTagName("lessonScore");
                    System.out.print(nlLesson.item(0).getFirstChild().
                                     getNodeValue());
                    System.out.println();
                }

                System.out.println("------------------------------------");
            }

            System.out.println("XML文件解析结束");
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}