Java程序不能显示Jar文本文件的内容 [英] Java Program Not Showing Contents of Text File in Jar
问题描述
我已经创建了一个java项目，并且在主屏幕上显示项目中的文本文件的内容。这在Eclipse中工作正常，但导出到可运行jar文件时不起作用。这里是什么在Eclipse中看起来像：
以下是在可运行Jar文件中的样子：
这里是代码：
code> import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import javax.sound.sampled.Clip;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.SwingConstants;
public class HomeFrame {
static JPanel panel;
public static JPanel p2;
private static JButton play = new JButton（Play）;
File patch = new File（Main.class.getResource（/ counter / res / ResourceCounterPatchNotes.txt）。getFile（））;
私人静态JButton微博;
私有静态JButton静音;
私人静态JButton信息;
私有静态JButton themeChooser;
私有静态JLabel stoneLogs;
// private static JLabel text;
public static JLabel greet = new JLabel（，SwingConstants.CENTER）;
static JFrame frame = new JFrame（Resource Counter - Home（by Grayson S））; {
frame.setSize（800，520）;
frame.setLocationRelativeTo（null）;
frame.setResizable（false）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
frame.repaint（）;
frame.revalidate（）;
createView（）;
}
private void createView（）{
setIcon（）;
panel = new JPanel（）;
frame.getContentPane（）。add（panel）;
play.setPreferredSize（new Dimension（200，70））;
p2 = new JPanel（）;
frame.getContentPane（）。add（p2）;
p2.setLayout（new GridBagLayout（））;
play.addActionListener（new ActionListener（）{
@Override
public void actionPerformed（ActionEvent e）{
try {
Thread.sleep（500 ）;
} catch（InterruptedException ex）{
Thread.currentThread（）。interrupt（）;
}
SelectionFrame.frame1.setVisible（true）;
frame .setVisible（false）;
}
}）;
p2.setLayout（new GridBagLayout（））;
p2.setBackground（Color.BLACK）; //设置背景颜色
GridBagConstraints gbc = new GridBagConstraints（）;
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridheight = GridBagConstraints.REMAINDER;
gbc.weightx = 1;
gbc.anchor = GridBagConstraints.CENTER;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.insets = new Insets（0，8，0，0）;
JTextArea ta = new JTextArea（10，20）;
ta.setForeground（Color.WHITE）;
ta.setBackground（Color.BLACK）;
ta.setFont（new Font（Lucida Sans，Font.PLAIN，12））;
//ta.setMargin（new Insets（12，12，12，12））;
p2.add（ta，gbc）;
//gbc.fill = GridBagConstraints.VERTICAL;
play.setFont（new Font（Segoe UI，Font.BOLD，16））;
gbc = new GridBagConstraints（）;
gbc.gridx = 1;
gbc.gridy = 0;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.insets = new Insets（8，8，0，5）;
gbc.anchor = GridBagConstraints.NORTH;
p2.add（info = new JButton（Info），gbc）;
info.setMargin（new Insets（12，12，12，12））;
gbc.gridy = 1;
p2.add（themeChooser = new JButton（Theme Chooser），gbc）;
themeChooser.setMargin（new Insets（12，12，12，12））;
gbc.gridy = 2;
p2.add（twitter = new JButton（Grayson's Twitter），gbc）;
twitter.setMargin（新的Insets（12，12，12，12））;
gbc.gridy = 3;
p2.add（mute = new JButton（Mute Music），gbc）;
mute.setMargin（new Insets（12，12，12，12））;
gbc.gridy = 4;
gbc.anchor = GridBagConstraints.CENTER;
p2.add（stoneLogs = new JLabel（），gbc）;
gbc.gridy = 5;
Image img = new ImageIcon（this.getClass（）。getResource（/ counter / res / Pick2.png））。getImage（）;
stoneLogs.setIcon（new ImageIcon（img））;
themeChooser.addActionListener（new ActionListener（）{
@Override
public void actionPerformed（ActionEvent e）{
ThemeFrame.frame.setLocationRelativeTo（null）;
ThemeFrame.frame.setVisible（true）;
}
}）;
info.addActionListener（new ActionListener（）{
@Override
public void actionPerformed（ActionEvent e）{
InfoFrame.frame.setLocationRelativeTo（null）;
InfoFrame.frame.setVisible（true）;
}
}）;
mute.addActionListener（new ActionListener（）{
@Override
public void actionPerformed（ActionEvent e）{
if（Main.clip.isRunning（））{
Main.clip.stop（）;
mute.setText（Play Music）;
} else {
Main.clip.loop（Clip.LOOP_CONTINUOUSLY）;
Main.clip.start（）;
mute.setText（Mute Music）;
}
{
}
}
}）;
twitter.addActionListener（new ActionListener（）{
@Override
public void actionPerformed（ActionEvent e）{
try {
String URL =https://twitter.com/Graysull;
java.awt.Desktop.getDesktop（）。browse（java.net.URI.create（URL））;
catch（IOException e1）{
e1.printStackTrace（）;
}
}}）;
gbc.gridx = 0;
gbc.anchor = GridBagConstraints.SOUTH;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
frame.add（play，BorderLayout.SOUTH）;
frame.getContentPane（）。setBackground（Color.GRAY）;
尝试{
ta.read（new FileReader（patch），null）;
ta.setEditable（false）;
} catch（FileNotFoundException e1）{
e1.printStackTrace（）;
} catch（IOException e1）{
e1.printStackTrace（）;
$ b greet.setFont（new Font（Dialog，Font.BOLD，20））;
frame.getContentPane（）。add（greet，BorderLayout.NORTH）;
$ b public void setIcon（）{
frame.setIconImage（Toolkit.getDefaultToolkit（）.getImage（Main.class.getResource（/ counter / res /Pick.png）））;
我该如何解决这个问题？帮助表示赞赏。
解决方案文件仅用于文件系统，不在罐子里面;您需要使用资源：Class，getResource或Class，getResourceAsStream，
FileReader是一个使用默认平台编码的工具类。但是你可能会在另一台计算机上部署该jar，然后编码可能会有所不同。
最好保留UTF-8或ISO-8859-1（拉丁文-1）。那些总是可用的。 （b
$ .class.getResourceAsStream（
/counter/res/ResourceCounterPatchNotes.txt），
StandardCharsets.UTF_8）））{
ta.read（in）;
}
获取NullPointerException时，路径可能从错误的目录开始，路径不符合wrt案子。要检查路径，请打开jar（例如7zip或WinZip）。
I have created a java project and on the home screen it is supposed to show the contents of a text file within the project. This works fine in Eclipse, but does not work when exported to a runnable jar file. Here is what is looks like in Eclipse:
Here is what it looks like in a runnable Jar file:
Here is the code:
import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Image; import java.awt.Insets; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import javax.sound.sampled.Clip; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.SwingConstants; public class HomeFrame { static JPanel panel; public static JPanel p2; private static JButton play = new JButton("Play"); File patch = new File(Main.class.getResource("/counter/res/ResourceCounterPatchNotes.txt").getFile()); private static JButton twitter; private static JButton mute; private static JButton info; private static JButton themeChooser; private static JLabel stoneLogs; //private static JLabel text; public static JLabel greet = new JLabel("", SwingConstants.CENTER); static JFrame frame = new JFrame("Resource Counter - Home (by Grayson S)"); { frame.setSize(800, 520); frame.setLocationRelativeTo(null); frame.setResizable(false); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.repaint(); frame.revalidate(); createView(); } private void createView() { setIcon(); panel = new JPanel(); frame.getContentPane().add(panel); play.setPreferredSize(new Dimension(200, 70)); p2 = new JPanel(); frame.getContentPane().add(p2); p2.setLayout(new GridBagLayout()); play.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { try { Thread.sleep(500); } catch(InterruptedException ex) { Thread.currentThread().interrupt(); } SelectionFrame.frame1.setVisible(true); frame.setVisible(false); } }); p2.setLayout(new GridBagLayout()); p2.setBackground(Color.BLACK); //sets the background color. GridBagConstraints gbc = new GridBagConstraints(); gbc.gridx = 0; gbc.gridy = 0; gbc.gridheight = GridBagConstraints.REMAINDER; gbc.weightx = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.HORIZONTAL; gbc.insets = new Insets(0, 8, 0, 0); JTextArea ta = new JTextArea(10, 20); ta.setForeground(Color.WHITE); ta.setBackground(Color.BLACK); ta.setFont(new Font("Lucida Sans", Font.PLAIN, 12)); //ta.setMargin(new Insets(12, 12, 12, 12)); p2.add(ta, gbc); //gbc.fill = GridBagConstraints.VERTICAL; play.setFont(new Font("Segoe UI", Font.BOLD, 16)); gbc = new GridBagConstraints(); gbc.gridx = 1; gbc.gridy = 0; gbc.weighty = 1; gbc.fill = GridBagConstraints.HORIZONTAL; gbc.insets = new Insets(8, 8, 0, 5); gbc.anchor = GridBagConstraints.NORTH; p2.add(info = new JButton("Info"), gbc); info.setMargin(new Insets(12, 12, 12, 12)); gbc.gridy = 1; p2.add(themeChooser = new JButton("Theme Chooser"), gbc); themeChooser.setMargin(new Insets(12, 12, 12, 12)); gbc.gridy = 2; p2.add(twitter = new JButton("Grayson's Twitter"), gbc); twitter.setMargin(new Insets(12, 12, 12, 12)); gbc.gridy = 3; p2.add(mute = new JButton("Mute Music"), gbc); mute.setMargin(new Insets(12, 12, 12, 12)); gbc.gridy = 4; gbc.anchor = GridBagConstraints.CENTER; p2.add(stoneLogs = new JLabel(""), gbc); gbc.gridy = 5; Image img = new ImageIcon(this.getClass().getResource("/counter/res/Pick2.png")).getImage(); stoneLogs.setIcon(new ImageIcon(img)); themeChooser.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { ThemeFrame.frame.setLocationRelativeTo(null); ThemeFrame.frame.setVisible(true); } }); info.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { InfoFrame.frame.setLocationRelativeTo(null); InfoFrame.frame.setVisible(true); } }); mute.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if (Main.clip.isRunning()) { Main.clip.stop(); mute.setText("Play Music"); } else { Main.clip.loop(Clip.LOOP_CONTINUOUSLY); Main.clip.start(); mute.setText("Mute Music"); } { } } }); twitter.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { try { String URL = "https://twitter.com/Graysull"; java.awt.Desktop.getDesktop().browse(java.net.URI.create(URL)); } catch (IOException e1) { e1.printStackTrace(); } }}); gbc.gridx = 0; gbc.anchor = GridBagConstraints.SOUTH; gbc.weighty = 1; gbc.fill = GridBagConstraints.HORIZONTAL; frame.add(play, BorderLayout.SOUTH); frame.getContentPane().setBackground(Color.GRAY); try { ta.read(new FileReader(patch), null); ta.setEditable(false); } catch (FileNotFoundException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } greet.setFont(new Font( "Dialog", Font.BOLD, 20)); frame.getContentPane().add(greet, BorderLayout.NORTH); } public void setIcon() { frame.setIconImage(Toolkit.getDefaultToolkit().getImage(Main.class.getResource("/counter/res/Pick.png"))); } }How can I fix this? Help is appreciated.
解决方案
Fileis just for the file system, not inside a jar; you need to use the resource:Class,getResourceorClass,getResourceAsStream,Also
FileReaderis a utility class using the default platform encoding. But you might deploy the jar on another computer, and then the encoding could be different.Best to keep the text in UTF-8 or ISO-8859-1 (Latin-1). Those are always available. And explicitly mention the encoding.
try (Reader in = new BufferedReader( new InputStreamReader( Main.class.getResourceAsStream( "/counter/res/ResourceCounterPatchNotes.txt"), StandardCharsets.UTF_8))) { ta.read(in); }When getting a NullPointerException, the path probably starts in the wrong directory, or the path does not match w.r.t. the case. To check the path, open the jar (with for instance 7zip or WinZip).
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