xml

Student.xml
<?xml version="1.0" encoding="UTF-8" ?> <学生列表>
<学生学号='72349876'>
<姓名>张三</姓名>
<性别> 男 </性别>
<年龄> 29 </年龄>
</学生>
<学生学号='12345678'>
<姓名>李张林</姓名>
<性别> 男 </性别>
<年龄> 18 </年龄>
</学生>
<学生学号='000'>
<姓名>张李号</姓名>
<性别> 女 </性别>
<年龄> 25 </年龄>
</学生>
</学生列表>
Aplication.java
public class Application{
public static void main(String args[]){
new StudentConditionWindow();
}
}
StudentConditionWindow.java
import java.awt.*;
import javax.swing.*;
public class StudentConditionWindow extends JFrame {
JTextField inputName,inputNumber;
JTextArea showResult;
JButton button;
Box baseBox ,boxV1,boxV2;
StudentConditionWindow(){
inputName=new JTextField(10);
inputNumber=new JTextField(10);
boxV1=Box.createVerticalBox();
boxV1.add(new Label("姓名中包含:"));
boxV1.add(new Label("学号中包含"));
boxV2=Box.createVerticalBox();
boxV2.add(inputName);
boxV2.add(inputNumber);
baseBox=Box.createHorizontalBox();
baseBox.add(boxV1);
baseBox.add(boxV2);
JPanel west=new JPanel();
west.add(baseBox);
button=new JButton("确定");
west.add(button);
add(west,BorderLayout.WEST);
showResult=new JTextArea(10,10);
showResult.setFont(new Font("宋体",Font.PLAIN,12));
add(new JScrollPane(showResult),BorderLayout.CENTER);
FindStudentByXPath findStudent; //负责使用XPath查询学生的对象
findStudent=
new
FindStudentByXPath(inputName,inputNumber,showResult,"student.xml");
button.addActionListener(findStudent);
setBounds(10,10,900,300);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
FindStudentByXPath.java
import javax.xml.xpath.*;
import org.w3c.dom.*;
import javax.swing.*;
import java.awt.event.*;
import org.xml.sax.*;
public class FindStudentByXPath implements ActionListener {
XPathFactory xPathFactory;
XPath xPath;
String positionPath;
InputSource source;
JTextField inputName,inputNumber;
JTextArea showResult;
FindStudentByXPath(JTextField inputName,JTextField inputNumber,JTextArea showResult,String fileName){
this.inputName=inputName;
this.inputNumber=inputNumber;
this.showResult=showResult;
xPathFactory=XPathFactory.newInstance();
xPath=xPathFactory.newXPath();
source=new InputSource(fileName);
this.positionPath=positionPath;
}
public void actionPerformed(ActionEvent e){
showResult.setText(null);
String studentName=inputName.getText().trim();
String studentNumber=inputNumber.getText().trim();
String predicates="[contains(姓名,'"+studentName+"') and "+ "contains(@学号,'"+studentNumber+"')]";
String path="/学生列表/学生"+predicates+"/*"; //XPath路径表达式
try{
NodeList nodelist=
(NodeList)xPath.evaluate(path,source,XPathConstants.NODESET);
int size=nodelist.getLength();
for(int k=0;k<size;k++){
Node node=nodelist.item(k);
String name=node.getNodeName();
showResult.append(" "+name+":");
String content=node.getTextContent();
showResult.append(content+"\n");
if(name.startsWith("年龄"))
showResult.append("--------------------------\n");
}
}
catch(Exception exp){
showResult.setText(null);
showResult.append("异常:"+exp); }
}
}。