Java Standalone可运行GUI应用程序-无法获取jar文件来打开程序

Question

I am working on a GUI client that will be a standalone application to act as a front end to a MySQL database back end. I have all of the logic and coding done for the client but I can not for the life of me get the project to export to a runnable .jar file.

I have the manifest.txt, which was generated by Eclipse, located in the META-INF file folder.

Here is my main method:

package binaparts.main;

import binaparts.gui.*;

public class Main{

public static void main(String[] args){

    MainFrames m = new MainFrames();
    m.displayGUI();
}
}

Here is the MainFrames class:

package binaparts.gui;

import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.ItemListener;
import java.sql.*;

import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.LayoutStyle.ComponentPlacement;

import org.json.JSONArray;
import org.json.JSONObject;

import binaparts.dao.*;
import binaparts.properties.ConfigurationManager;

public class MainFrames extends JFrame
{
private MainPanel main;
private CreatePanel create;
private UpdatePanel update;
private FindPanel find;
private SettingsPanel settings;
private ManageUsersPanel Manage;
JFrame frame = new JFrame("Main Menu:");
static final String configFilePath = "META-INF/config.properties";
DBConnect con = new DBConnect();
ConfigurationManager config = null;

public void run(){
  displayGUI();
}

public void displayGUI()
{
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel contentPane = new JPanel();
    contentPane.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
    contentPane.setLayout(new CardLayout());
    main = new MainPanel(contentPane);
    create = new CreatePanel(contentPane);
    update = new UpdatePanel(contentPane);
    find = new FindPanel(contentPane);
    settings = new SettingsPanel(contentPane);
    Manage = new ManageUsersPanel(contentPane);
    contentPane.add(main, "Main Menu");
    contentPane.add(create, "Create Part");
    contentPane.add(update, "Update Part");
    contentPane.add(find, "Find Part");
    contentPane.add(settings, "Settings");
    contentPane.add(Manage, "Manage Users");
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    int height = screenSize.height;
    int width = screenSize.width;
    frame.setResizable(false);
    frame.setSize(width/2, height/2);
    frame.setLocationRelativeTo(null);
    frame.setSize(700, 580);
    frame.setContentPane(contentPane);
    frame.setVisible(true); 
}
class MainPanel extends JPanel{Contains code for that frame}
class MainPanel extends JPanel{Contains code for that frame}
class CreatePanel extends JPanel{Contains code for that frame}
class UpdatePanel extends JPanel{Contains code for that frame}
class FindPanel extends JPanel{Contains code for that frame}
class SettingsPanel extends JPanel{Contains code for that frame}
class ManageUsersPanel extends JPanel{Contains code for that frame}
}

I did not include the code for each panel so as not to clutter this. There are also a couple other classes for managing configuration properties and database connections that work just fine.

My question is: Is there a problem with my main method/displayGUI interaction or with the process of creating the jar?

Thanks in advance for any help!

I ran the cmd java -jar my.jar and got

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Danny>cd desktop

C:\Users\Danny\Desktop>cd executable

C:\Users\Danny\Desktop\Executable>java -jar BinaPartsManager.jar
java.io.FileNotFoundException: META-INF\config.properties (The system cannot fin
d the path specified)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(Unknown Source)
        at java.io.FileOutputStream.<init>(Unknown Source)
        at binaparts.properties.ConfigurationManager.save(ConfigurationManager.j
ava:41)
        at binaparts.properties.ConfigurationManager.<init>(ConfigurationManager
.java:21)
        at binaparts.dao.DBConnect.verifyUser(DBConnect.java:87)
        at binaparts.gui.MainFrames$MainPanel.setStatus(MainFrames.java:110)
        at binaparts.gui.MainFrames$MainPanel.<init>(MainFrames.java:137)
        at binaparts.gui.MainFrames.displayGUI(MainFrames.java:66)
        at binaparts.main.RunProgram.main(RunProgram.java:10)
java.lang.NullPointerException
        at binaparts.dao.DBConnect.close(DBConnect.java:21)
        at binaparts.gui.MainFrames$MainPanel.setStatus(MainFrames.java:127)
        at binaparts.gui.MainFrames$MainPanel.<init>(MainFrames.java:137)
        at binaparts.gui.MainFrames.displayGUI(MainFrames.java:66)
        at binaparts.main.RunProgram.main(RunProgram.java:10)
Exception in thread "main" java.lang.NullPointerException
        at javax.swing.ImageIcon.<init>(Unknown Source)
        at binaparts.gui.MainFrames$MainPanel.<init>(MainFrames.java:147)
        at binaparts.gui.MainFrames.displayGUI(MainFrames.java:66)
        at binaparts.main.RunProgram.main(RunProgram.java:10)

I have the config.properties file stored in the META-INF folder. It runs fine in the IDE though.

Answer 1

Again: "you can use Java resources to load the properties file as an embedded-resource (see the tag info for related tutorials), though you can't store values there that are going to change". You haven't said whether they're going to change.

If you are going to store a few things, the (new-ish) way to do that is with the java.util.Preferences API.

If you really need your own file, I suppose the user's' home directory is the place to put a directory of your own in which to store the file, look up user.home as a system parameter.

Answer 2

Another tip: use

java.awt.*; //to import everything from java.awt
javax.swing.*; //to import everything from javax.swing