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java - 无法在 src 目录下找到文件和图像

转载 作者:行者123 更新时间:2023-11-30 04:27:46 25 4
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在我的程序中,src 目录下列出了三个文件夹:文件、声音、图像。我不确定为什么我的代码没有被检测到。当我运行程序时,我收到以下消息:“java.io.FileNotFoundException:files\7.txt(系统找不到指定的路径)”。我这里附有图片。请帮忙。

下面是我的代码:

package riddle;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.net.URL;
import java.util.Random;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.border.Border;
import javax.swing.border.CompoundBorder;

public class Math_Riddle extends JFrame implements ActionListener
{
/**
*
*/
private static final long serialVersionUID = 1L;
JLabel lblQuestion;
JLabel lblImage;
JButton bOK;
JButton bExit;
JPanel radioPanel;
JPanel panBottom;
JRadioButton[] radioButton;
String [] store ;
ButtonGroup bg;
JButton bNext;
JPanel mainPanel;
JPanel pRight;
JLabel lblCorrect;
JLabel lblWrong;
int vCorrect = 0;
int vWrong = 0;
public Math_Riddle()
{
mainPanel = new JPanel(new BorderLayout());
buildingGUI();
listAllFiles();
innitializeAllComponents();
int fileNumber = generateRandomNumber();
String filePath = "files/" + fileNumber + ".txt";
String strQuestion = readTextFile(filePath);
store = strQuestion.toString().split("!!!");
lblQuestion.setText("<html>" + store[0] + "</html>");
//I need to get the image and display at the center according
//to the fileNumber;
getTheImageAndDisplay(fileNumber);
assignRandomNumberToRadioButton(store[1]);
mainPanel.add(lblQuestion, BorderLayout.NORTH);
mainPanel.add(radioPanel, BorderLayout.WEST);
mainPanel.add(panBottom, BorderLayout.SOUTH);
mainPanel.add(lblImage, BorderLayout.CENTER);
mainPanel.setPreferredSize(new Dimension(640, 480));

this.getContentPane().add(mainPanel);
}

private void listAllFiles()
{
// TODO Auto-generated method stub
File file = new File(".");
for(String fileNames : file.list()) System.out.println(fileNames);
}

private void getTheImageAndDisplay(int fileNumber)
{
// TODO Auto-generated method stub
String filePath = "images/";
lblImage.setIcon(new ImageIcon(filePath + fileNumber + ".png"));
}

private void assignRandomNumberToRadioButton(String sAnswer)
{
// TODO Auto-generated method stub
int number = Integer.parseInt(sAnswer.toString().trim());
System.out.println("number: " + number);
Random random = new Random();
int rand = random.nextInt(4); //This is the number of radioButton.
System.out.println("rand is: " + rand);
radioButton[rand].setText(sAnswer);

if(!radioButton[0].getText().equals(""))
{
radioButton[1].setText("" +( number + 2));
radioButton[2].setText("" + (number - 2));
radioButton[3].setText("" + (number + 1));
}
else if(!radioButton[1].getText().equals(""))
{
radioButton[0].setText("" +( number + 2));
radioButton[2].setText("" + (number - 2));
radioButton[3].setText("" + (number + 1));
}
else if(!radioButton[2].getText().equals(""))
{
radioButton[1].setText("" +( number + 2));
radioButton[0].setText("" + (number - 2));
radioButton[3].setText("" + (number + 1));
}
else if(!radioButton[3].getText().equals(""))
{
radioButton[1].setText("" +( number + 2));
radioButton[2].setText("" + (number - 2));
radioButton[0].setText("" + (number + 1));
}
}

/**
* Construct GUI.
*/
private void buildingGUI()
{
lblImage = new JLabel();
bNext = new JButton("Next");
lblQuestion = new JLabel();
bOK = new JButton("OK");
bExit = new JButton("Exit");
lblQuestion.setFont(new Font("Tahoma", Font.PLAIN, 12));
radioPanel = new JPanel();
panBottom = new JPanel();
panBottom.setLayout(new GridLayout(1, 2));
panBottom.add(bOK);
panBottom.add(bExit);
bg = new ButtonGroup();
radioPanel.setLayout(new GridLayout(4, 1));
radioButton = new JRadioButton[4];
radioButton[0] = new JRadioButton();
radioButton[1] = new JRadioButton();
radioButton[2] = new JRadioButton();
radioButton[3] = new JRadioButton();
radioPanel.setLayout(new GridLayout(10, 1));
radioPanel.add(radioButton[0]);
radioPanel.add(radioButton[1]);
radioPanel.add(radioButton[2]);
radioPanel.add(radioButton[3]);
radioPanel.add(new JLabel());
radioPanel.add(new JLabel());
radioPanel.add(new JLabel());
radioPanel.add(bNext);
radioPanel.add(new JLabel());
radioPanel.add(new JLabel());
bg.add(radioButton[0]);
bg.add(radioButton[1]);
bg.add(radioButton[2]);
bg.add(radioButton[3]);
pRight = new JPanel();
pRight.setLayout(new GridLayout(5, 2));
lblCorrect = new JLabel();
pRight.add(lblCorrect);
lblWrong = new JLabel();
pRight.add(lblWrong);
pRight.add(new JLabel(" "));
pRight.add(new JLabel(" "));
mainPanel.add(pRight, BorderLayout.EAST);
}

private int generateRandomNumber()
{
// TODO Auto-generated method stub
Random random = new Random();
int rand = random.nextInt(20); //This is the number of Files in the system.
return rand;
}

private void innitializeAllComponents()
{
// TODO Auto-generated method stub
CompoundBorder border;
Border raisedbevel = BorderFactory.createRaisedBevelBorder();
Border loweredbevel = BorderFactory.createLoweredBevelBorder();
border = BorderFactory.createCompoundBorder( raisedbevel, loweredbevel);
lblQuestion.setFont(new Font("Tahoma", Font.PLAIN, 18));
lblQuestion.setBorder(BorderFactory.createLineBorder(Color.GREEN));
lblQuestion.setBorder(border);
radioPanel.setBorder(border);
pRight.setBorder(border);
panBottom.setBorder(border);
radioButton[0].setFont(new Font("Tahoma", Font.BOLD, 16));
radioButton[1].setFont(new Font("Tahoma", Font.BOLD, 16));
radioButton[2].setFont(new Font("Tahoma", Font.BOLD, 16));
radioButton[3].setFont(new Font("Tahoma", Font.BOLD, 16));
lblCorrect.setFont(new Font("Tahoma", Font.BOLD, 14));
lblCorrect.setForeground(Color.BLUE);
lblCorrect.setHorizontalAlignment(JLabel.CENTER);
lblWrong.setFont(new Font("Tahoma", Font.BOLD, 14));
lblWrong.setForeground(Color.red);
lblWrong.setHorizontalAlignment(JLabel.CENTER);
bNext.addActionListener(this);
}
@SuppressWarnings("resource")
private static String readTextFile(String fileName)
{
// TODO Auto-generated method stub
BufferedReader reader;
try
{
reader = new BufferedReader(new FileReader(fileName));
String line = null;
StringBuilder stringBuilder = new StringBuilder();
String ls = System.getProperty("line.separator");
try
{
while(( line = reader.readLine()) != null )
{
stringBuilder.append(line);
stringBuilder.append(ls);
}
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
return stringBuilder.toString();
}
catch (FileNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}

@Override
public void actionPerformed(ActionEvent ae)
{
// TODO Auto-generated method stub
if(ae.getSource().equals(bNext))
{
//if nothing selected, display a message,
//else: get the answer and display.
if(!radioButton[0].isSelected() && !radioButton[1].isSelected() &&
!radioButton[2].isSelected() && !radioButton[3].isSelected())
{
JOptionPane.showMessageDialog(this,"Please select an Answer.", "Nothing selected",
JOptionPane.OK_OPTION);
return;
}
else //when user select an answer.
{
String strAnswer = "";
if(radioButton[0].isSelected())
{
strAnswer = radioButton[0].getText().trim();
}
else if(radioButton[1].isSelected())
{
strAnswer = radioButton[1].getText().trim();
}
else if(radioButton[2].isSelected())
{
strAnswer = radioButton[2].getText().trim();
}
else if(radioButton[3].isSelected())
{
strAnswer = radioButton[3].getText().trim();
}
if(strAnswer.equals(store[1].trim()))
{
String strCorrect = lblCorrect.getText();
if(strCorrect.equals(""))
{
strCorrect = "0";
}
vCorrect = Integer.parseInt(strCorrect);
vCorrect = vCorrect + 1;
lblCorrect.setText("" + vCorrect);
playSound("correct");
}
else
{
String strWrong = lblWrong.getText();
if(strWrong.equals(""))
{
strWrong = "0";
}
vWrong = Integer.parseInt(strWrong);
vWrong = vWrong + 1;
lblWrong.setText("" + vWrong);
playSound("wrong");
}
int fileNumber = generateRandomNumber();
String filePath = "files\\" + fileNumber + ".txt";
System.out.println("filePath: " + filePath);
String strQuestion = readTextFile(filePath);
store = strQuestion.toString().split("!!!");
lblQuestion.setText("<html>" + store[0] + "</html>");
System.out.println("store[0] is: " + store[0]);
System.out.println("store[1]" + store[1]);
clearTextInAllRadioButtons();
assignRandomNumberToRadioButton(store[1]);
getTheImageAndDisplay(fileNumber);
}
}
}

private void playSound(String sound)
{
// TODO Auto-generated method stub
try
{
URL url = null;
if(sound.equals("correct"))
{
url = this.getClass().getClassLoader().getResource("sound/ding.wav");
}
else if(sound.equals("wrong"))
{
url = this.getClass().getClassLoader().getResource("sound/buzz.wav");
}
AudioInputStream audioIn = AudioSystem.getAudioInputStream(url);
// Get a sound clip resource.
Clip clip = AudioSystem.getClip();
// Open audio clip and load samples from the audio input stream.
clip.open(audioIn);
clip.start();
}
catch (UnsupportedAudioFileException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
catch (LineUnavailableException e)
{
e.printStackTrace();
}
}

private void clearTextInAllRadioButtons()
{
// TODO Auto-generated method stub
radioButton[0].setText("");
radioButton[1].setText("");
radioButton[2].setText("");
radioButton[3].setText("");
bg.clearSelection();
}

/**
* @param args
*/
public static void main(String[] s)
{
Math_Riddle mr = new Math_Riddle();
mr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mr.pack();
mr.setVisible(true);
}
}
<小时/>

关于文件 file = new File(resource.toURI());这是我尝试过但仍然无效的方法:

URL url = null;
Random rand = new Random();
int random = rand.nextInt(19);
String filePath = "files/" + random + ".txt";
System.out.println("file: " + filePath);
url = this.getClass().getClassLoader().getResource(filePath);
System.out.println(url.toString().trim());
try
{
File file = new File(url.toURI());
}
catch (URISyntaxException e1)
{
// TODO Auto-generated catch block
e1.printStackTrace();
}
File folder = new File(".");
for(String fileNames : folder.list())
{
System.out.println(fileNames);
}
BufferedReader reader;
try
{
reader = new BufferedReader(new FileReader(filePath));
String line = null;
StringBuilder stringBuilder = new StringBuilder();
String ls = System.getProperty("line.separator");
try
{
while(( line = reader.readLine()) != null )
{
stringBuilder.append(line);
stringBuilder.append(ls);
}
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
catch (FileNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}

下面是eclipse中的错误信息:

文件:files/5.txt文件:/C:/JavaProject/Tesing/bin/files/5.txt.classpath。项目.设置垃圾桶图片源代码java.io.FileNotFoundException: files\5.txt (系统找不到指定的路径) 在 java.io.FileInputStream.open( native 方法) 在 java.io.FileInputStream.(来源未知) 在 java.io.FileInputStream.(来源未知) 在 java.io.FileReader.(来源未知) 在Testing.actionPerformed(Testing.java:72)

当我尝试列出所有文件/文件夹时。它只列出了文件夹:bin、images、src...如您在上面看到的。请帮忙。提前致谢。

最佳答案

您正在指定带有路径的资源文件。仅当您确实知道当前目录的完整路径或相对路径时,这才有效;例如按照另一个答案中的建议,在前面加上“src”。

但是,最好在构建中包含资源(无论是通过 IDE 还是外部构建系统(如 gradle 或 maven)构建),以便将这些文件复制到类路径中(可能是您已经在这样做了)。在这种情况下,您可以使用 Java 类加载器检索资源,如下所示:

URL resource = getClass().getResource("/path/to/resource");

这里有一些注释:

  1. 前导“/”指定类加载器应从根包中搜索。如果省略,它将从您所在类的包中搜索相对值。
  2. 您得到的是一个 URL,而不是一个文件。很多时候,可以直接使用这些 URL,就像在您使用的 ImageIcon 构造函数中一样。此方法的另一个好处是,如果您的应用程序也打包在 jar 文件中,那么它就可以工作,因为那时 URL 将指向 jar 文件中的正确位置。但是,如果您知道它是一个文件,并且您需要文件引用,则可以像这样转换:File file = new File(resource.toURI ());

编辑:以下是一个适合丹尼的示例,基于他的“答案”帖子和示例。

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;

public class ResourceTest {

public static void main(String[] args) throws IOException, URISyntaxException {
new ResourceTest().test();
}

public void test() throws URISyntaxException, IOException {
URL url = getClass().getClassLoader().getResource("files/1.txt");
System.out.println("URL: " + url);

File file = new File(url.toURI());
System.out.println("FILE: " + file);

File folder = file.getParentFile();
System.out.println("FOLDER: " + folder);
System.out.println("FOLDER LIST: ");
for (String fileName : folder.list()) {
System.out.println(" " + fileName);
}

System.out.println("FILE CONTENTS:");
BufferedReader reader = new BufferedReader(new FileReader(file));
String line = reader.readLine();
while (line != null) {
System.out.println(line);
line = reader.readLine();
}
}
}

产生以下输出:

URL: file:/home/steinar/Safe/source/private/out/production/files/1.txt
FILE: /home/steinar/Safe/source/private/out/production/files/1.txt
FOLDER: /home/steinar/Safe/source/private/out/production/files
FOLDER LIST:
1.txt
FILE CONTENTS:
This is
my test
text file

关于java - 无法在 src 目录下找到文件和图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15439429/

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