我已经创建了一个应用程序(使用Java)并对其设置了密码保护:当我在Eclipse中运行/编译代码时，它可以正常工作，但是当我创建一个jar文件并运行该jar时，它就无法正常工作:它向我展示了初始框架但此后没有任何效果:
最初，当我创建第一个jar时，它可以正常工作，但是当我添加密码重置功能时，它就停止工作:
在回答之前，请记住，代码在编译器(即Eclipse)中可以正常工作，但在转换为jar时无法正常工作。
转换过程:File>Export>Runnable Jar(选择的选项-package required libraries into jar)
在Eclipse中有效的输出-屏幕截图图像here
一个不起作用的(从jar执行)
屏幕截图图像here
与代码相关的代码(考虑声明和初始化的每件事)
public JFrame psFrame=new JFrame("Password Check");
private JPasswordField psField;
private static int tries=5;
static boolean condition=false;
private String Check,password;
//////////// CONSTRUCTOR ///////////
public MenusAndButtons(){
super("Explorer");
extraString=null;
try {passwordSetter();}catch (FileNotFoundException e){e.printStackTrace();}
paswardCheck();
}
public synchronized void paswardCheck(){
Check=null;
psFrame.setSize(400, 120);
psFrame.setLocation(480, 300);
psField=new JPasswordField("",30);
psField.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==psField){
Check=e.getActionCommand();
if(tries!=1){
if(Check!=null){
if(password.equals(Check)){
JOptionPane.showMessageDialog(null, "Welcome to Explorer ", "Welcome", JOptionPane.INFORMATION_MESSAGE);
condition=true;
psFrame.dispose();
Mnb();}
else{tries--;
JOptionPane.showMessageDialog(null,"You Entered a Wrong Password.\nYou are Left With " +tries+ " more Tries.\nPlease complete The Password Check with Correct Password\n", "Warrnning ",JOptionPane.WARNING_MESSAGE);
psField.setText(null); }
}else{JOptionPane.showMessageDialog(null,"You Entered Nothing in Password Field.\nPlease Enter a Password.","Null value Password Check",JOptionPane.ERROR_MESSAGE);
psField.setText(null);}
}else{JOptionPane.showMessageDialog(null,"You Entered a Wrong Password 5 Times.\nExplorer is Quiting Now.","Password Check Failed ",JOptionPane.ERROR_MESSAGE);
psFrame.dispose();
System.exit(0);}
}
}});
psFrame.setLayout(new FlowLayout());
psFrame.add(new JLabel("Enter Password"));
psFrame.add(psField);
psFrame.setResizable(false);
psFrame.setVisible(true);
}
public void passwordSetter() throws FileNotFoundException{
Scanner sc=new Scanner(new File("PasswordContainer.txt"));
while(sc.hasNext())
password=sc.nextLine();
sc.close();
}
public void passwordresetter() throws Exception{
String old=JOptionPane.showInputDialog(null,"Please Enter current Password","Current Password Check",JOptionPane.CANCEL_OPTION);
if(old.equals(password)){
String usererntry=JOptionPane.showInputDialog(null, "Please Enter new Password","Reset Password",JOptionPane.CANCEL_OPTION);
if(usererntry.length()>=6){
Formatter fp=new Formatter("PasswordContainer.txt");
fp.format("%s",usererntry);
fp.close();
JOptionPane.showMessageDialog(null,"You've successfully Change Your Password","Password Change Conformation",JOptionPane.PLAIN_MESSAGE);
}else{
JOptionPane.showMessageDialog(null,"You Password Must Contain at least 6 Characters\nPlease Retype the New Password ");
passwordresetter();}
}
else{JOptionPane.showMessageDialog(null,"You Entered Wrong Password\nPlease Retype the Current Password ");
passwordresetter();
}
}
最佳答案
根据您的描述，听起来您的 jar 没有按照您的想象组装。
如果没有显示面板，则可能缺少支持库。
我将用jar文件打开并浏览内容。无论如何，当您学习Java时，这都是一个有趣的练习(根据个人资料，我注意到您是一名学生)。仔细检查一下jar，并确保它包含支持应用程序所需的所有内容。我的猜测是，无论您使用什么框架，都无法完全复制到jar中。
关于java - jar 不起作用？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18378802/