Java Swing+DOM API读取XML遇FileNotFoundException求助

数据老陈

2026-7-25

问题：Java Swing程序读取XML文件时触发FileNotFoundException

我编写了一个基于Java Swing的用户界面程序，使用DOM API读取Catalogue.xml文件，实现通过下拉框选择导演查询对应影片的功能。但运行时触发java.io.FileNotFoundException，已尝试填写文件完整路径、将XML文件复制到build文件夹，均无法解决问题。以下是代码及报错堆栈信息：

程序代码

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.*;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;

public class NewJFrame extends javax.swing.JFrame {
    private JComboBox<String> directorDropdown;
    private JButton searchButton;
    private JTextArea resultTextArea;

    public NewJFrame() {
        init();
    }

    @SuppressWarnings("unchecked")
                                      
private void init() {

        directorDropdown = new JComboBox<String>();
        directorDropdown.setModel(new DefaultComboBoxModel<String>(new String[] {"Abdellah Ghayth", "Mouna Wacef", "ELaakad"}));
        getContentPane().add(directorDropdown);

        searchButton = new JButton("Search");
        searchButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    // Get the selected director from the dropdown
                    String nomRealisateur = directorDropdown.getSelectedItem().toString();

                    // Create a parser for the XML document
                    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                    DocumentBuilder builder = factory.newDocumentBuilder();

                    // Load the XML document into a Document object
                    Document document = builder.parse(new File("Catalogue.xml"));

                    // Find the films directed by the selected director and display their titles
                    StringBuilder result = new StringBuilder();
                    NodeList films = document.getElementsByTagName("film");
                    for (int i = 0; i < films.getLength(); i++) {
                        Element film = (Element) films.item(i);
                        Element realisateur = (Element) film.getElementsByTagName("realisateur").item(0);
                        if (realisateur.getAttribute("ref").equals(nomRealisateur)) {
                            String titre = film.getAttribute("titre");
                            result.append(titre + "\n");
                        }
                    }
                    resultTextArea.setText(result.toString());
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        });
        getContentPane().add(searchButton);

        resultTextArea = new JTextArea();
        resultTextArea.setEditable(false);
        getContentPane().add(new JScrollPane(resultTextArea));

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));
        pack();
    }

    public static void main(String args[]) {

    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
                 try {
                // Spécifier le nom du réalisateur recherché
                String nomRealisateur = "ELaakad";

                // Créer un parseur de document XML
                DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                DocumentBuilder builder = factory.newDocumentBuilder();

                // Charger le document XML dans un objet Document
                Document document = builder.parse(new File("Catalogue.xml"));

                // Obtenir une liste des éléments "film" dans le document
                NodeList films = document.getElementsByTagName("film");

                // Créer un modèle de liste pour les titres de films
                DefaultListModel<String> listModel = new DefaultListModel<String>();

                // Parcourir chaque élément "film" pour trouver ceux réalisés par le réalisateur spécifié
                for (int i = 0; i < films.getLength(); i++) {
                    Element film = (Element) films.item(i);
                    Element realisateur = (Element) film.getElementsByTagName("realisateur").item(0);

                    // Vérifier si le réalisateur correspond à celui recherché
                    if (realisateur.getAttribute("ref").equals(nomRealisateur)) {
                        String titre = film.getAttribute("titre");
                        listModel.addElement(titre);
                    }
                }

                // Créer une liste pour afficher les titres de films
                JList<String> list = new JList<String>(listModel);

 
            } catch (Exception e) {
                e.printStackTrace();
            }
            }
        });
    }

}

报错堆栈

java.io.FileNotFoundException: "path" (The system cannot find the file specified)
    at java.base/java.io.FileInputStream.open0(Native Method)
    at java.base/java.io.FileInputStream.open(FileInputStream.java:216)
    at java.base/java.io.FileInputStream.<init>(FileInputStream.java:157)
    at java.base/java.io.FileInputStream.<init>(FileInputStream.java:111)
    at java.base/sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:86)
    at java.base/sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:189)
    at java.xml/com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:653)
    at java.xml/com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:150)
    at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:861)
    at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:825)
    at java.xml/com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
    at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:247)
    at java.xml/com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:342)
    at java.xml/javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:206)
    at NewJFrame$3.run(NewJFrame.java:132)
    at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:771)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:716)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:741)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

排查方案

确认程序工作目录：Java程序默认从启动时的当前目录读取文件，不是build文件夹或类文件所在目录。在代码里加一行打印当前路径：
```
System.out.println(System.getProperty("user.dir"));
```
把Catalogue.xml放到打印出的目录下即可。
改用类加载器读取资源：如果XML是项目资源，推荐用类加载器获取输入流，彻底避免路径问题。把读取XML的代码替换成：
```
InputStream is = getClass().getResourceAsStream("/Catalogue.xml");
if (is == null) {
    throw new FileNotFoundException("Catalogue.xml not found in classpath");
}
Document document = builder.parse(is);
```
注意要把XML放在项目的resources目录（Maven/Gradle项目），或者和编译后的类文件同目录，这样类加载器能找到它。
检查绝对路径写法：如果用绝对路径，Windows系统要转义反斜杠，比如"C:\\Users\\你的用户名\\Catalogue.xml"，或者直接用正斜杠"C:/Users/你的用户名/Catalogue.xml"，避免路径字符串转义错误。
移除冗余代码：main方法里有一段重复读取XML的逻辑，而且创建的JList也没添加到界面上，这段代码会重复触发文件查找错误，建议直接删掉。

内容的提问来源于stack exchange，提问作者Houssam Eddine

Java Swing+DOM API读取XML遇FileNotFoundException求助

程序代码 #

报错堆栈 #

排查方案 #

程序代码

报错堆栈

排查方案