嗨，我用 eclipse 做了一个小程序，我想把它发送到另一台朋友的电脑上，这样他们也可以使用这个程序。我在互联网上找到了一个简单的教程： 如何分发在 Eclipse 中构建的 java 项目？ 伙计们的解决方案是：
您可以右键单击项目，选择导出并选择 Java，然后选择 JAR 作为格式。
但是，当我这样做并尝试将其发送到朋友的计算机时，他们收到了此错误：
找不到主类：pisavior.PISavior 程序现在将退出。
我尝试将其导出为可运行的 jar 文件和普通的 jar 文件。都没有奏效。我认为问题可能出在我的主要课程上？也许它没有被阅读？或者可能没有发送库？任何人都可以给我一些方向吗？非常感激！
这是我的代码，有点长...
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
public class PISavior implements MouseListener {
Random random = new Random();
private static int amount;
private static int editLine;
private static String locations[];
private static String usernames[];
private static String passwords[];
private final char LOWERCASE[] =
{
'a', 'b', 'c', 'd', 'e',
'f', 'g', 'h', 'i', 'j',
'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't',
'u', 'v', 'w', 'x', 'y',
'z'
};
private final char UPPERCASE[] =
{
'A', 'B', 'C', 'D', 'E',
'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y',
'Z'
};
private final char NUMBERS[] =
{
'0', '1', '2', '3', '4',
'5', '6', '7', '8', '9'
};
private static volatile boolean edit = false;
JFrame frame = new JFrame();
JPanel panel = new JPanel();
JCheckBox jcb_Integers = new JCheckBox("Integers");
JCheckBox jcb_Capitals = new JCheckBox("Capitals");
JScrollPane jscroll;
JLabel jlb_Location = new JLabel("Location");
JLabel jlb_Username = new JLabel("Username");
JLabel jlb_Password = new JLabel("Password");
JLabel jlb_Amount = new JLabel("Amount:");
JLabel jlb_Length = new JLabel("Length:");
JLabel jlb_Locations[];
JLabel jlb_Usernames[];
JLabel jlb_Passwords[];
JButton jbt_AddLocation = new JButton("Add Location");
JButton jbt_Save = new JButton("Save");
JButton jbt_Add = new JButton("Add");
JButton jbt_Randomize = new JButton("Randomize");
JButton jbt_Edit = new JButton("Edit");
JTextField jtf_Locations[];
JTextField jtf_Usernames[];
JTextField jtf_Passwords[];
JTextField jtf_Location = new JTextField();
JTextField jtf_Username = new JTextField();
JTextField jtf_Password = new JTextField();
JTextField jtf_Integers = new JTextField();
JTextField jtf_Capitals = new JTextField();
JTextField jtf_Length = new JTextField();
public static void main(String args[]) throws FileNotFoundException{
new PISavior();
}
public PISavior() throws FileNotFoundException{
panel.setLayout(null);
panel.addMouseListener(this);
panel.setBounds(0, 0, 400,400);
load();
addMainUI();
//======================================================================
// ** Main User Interface
//======================================================================
panel.add(jlb_Location);
panel.add(jlb_Username);
panel.add(jlb_Password);
jbt_AddLocation.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
edit = false;
removeMainUI();
addLocationUI();
panel.repaint();
}
});
jbt_Save.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
save();
} catch (IOException ex) {
Logger.getLogger(PISavior.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
//======================================================================
// ** Add Location User Interface
//======================================================================
jtf_Location.setBounds(5, 25, 100, 20);
jtf_Username.setBounds(5, 65, 100, 20);
jtf_Password.setBounds(5, 105, 100, 20);
jlb_Amount.setBounds(210, 10, 100, 20);
jcb_Integers.setBounds(130, 30, 80, 20);
jcb_Integers.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jtf_Integers.setEnabled(jcb_Integers.isSelected());
}
});
jcb_Capitals.setBounds(130, 60, 80, 20);
jcb_Capitals.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jtf_Capitals.setEnabled(jcb_Capitals.isSelected());
}
});
jtf_Integers.setBounds(210, 30, 50, 20);
jtf_Integers.setEnabled(false);
jtf_Integers.setText("0");
jtf_Capitals.setBounds(210, 60, 50, 20);
jtf_Capitals.setEnabled(false);
jtf_Capitals.setText("0");
jlb_Length.setBounds(135, 90, 80, 20);
jtf_Length.setBounds(210, 90, 50, 20);
jtf_Length.setText("0");
jbt_Randomize.setBounds(140, 120, 100, 20);
jbt_Randomize.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int length = Integer.parseInt(jtf_Length.getText());
int integers = Integer.parseInt(jtf_Integers.getText());
int capitals = Integer.parseInt(jtf_Capitals.getText());
if (length != 0 && length >= (integers + capitals)) {
jtf_Password.setText(getRandomPassword(length, jcb_Integers.isSelected() != false ? integers : 0, jcb_Capitals.isSelected() != false ? capitals : 0));
}
}
});
jbt_Add.setBounds(20, 135, 60, 15);
jbt_Add.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
addInformation(jtf_Location.getText().length() == 0 ? "(Empty)" : jtf_Location.getText(), jtf_Username.getText().length() == 0 ? "(Empty)" : jtf_Username.getText(), jtf_Password.getText().length() == 0 ? "(Empty)" : jtf_Password.getText());
jtf_Location.setText("");
jtf_Username.setText("");
jtf_Password.setText("");
removeLocationUI();
addMainUI();
panel.repaint();
}
});
jbt_Edit.setBounds(20, 135, 60, 15);
jbt_Edit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int i = editLine;
locations[i] = jtf_Location.getText();
usernames[i] = jtf_Username.getText();
passwords[i] = jtf_Password.getText();
jlb_Locations[i].setText(locations[i]);
jlb_Usernames[i].setText(usernames[i]);
jlb_Passwords[i].setText(passwords[i]);
jtf_Location.setText("");
jtf_Username.setText("");
jtf_Password.setText("");
removeLocationUI();
addMainUI();
panel.repaint();
}
});
jscroll = new JScrollPane(panel);
frame.setTitle("Personal Information Savior");
frame.setSize(300,240);
frame.setContentPane(jscroll);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void removeMainUI() {
if (amount != 0) {
for (int i = 0; i < amount; i++) {
panel.remove(jlb_Locations[i]);
panel.remove(jlb_Usernames[i]);
panel.remove(jlb_Passwords[i]);
}
}
panel.remove(jbt_AddLocation);
panel.remove(jbt_Save);
panel.repaint();
}
public void addMainUI() {
jlb_Location.setBounds(10, 5, 100, 20);
jlb_Username.setBounds(100, 5, 100, 20);
jlb_Password.setBounds(200, 5, 100, 20);
jbt_AddLocation.setBounds(75, (20 * amount) + 25, 110, 15);
jbt_Save.setBounds(90, (20 * amount) + 45, 80, 15);
jlb_Location.setText("Location");
jlb_Username.setText("Username");
jlb_Password.setText("Password");
panel.setPreferredSize(new Dimension(200, amount * 30));
if (amount != 0) {
for (int i = 0; i < amount; i++) {
jlb_Locations[i].setBounds(10, 25 + (i * 20), 100, 20);
jlb_Usernames[i].setBounds(100, 25 + (i * 20), 100, 20);
jlb_Passwords[i].setBounds(200, 25 + (i * 20), 100, 20);
panel.add(jlb_Locations[i]);
panel.add(jlb_Usernames[i]);
panel.add(jlb_Passwords[i]);
}
}
panel.add(jbt_AddLocation);
panel.add(jbt_Save);
panel.repaint();
}
public void removeLocationUI() {
panel.remove(jtf_Location);
panel.remove(jtf_Username);
panel.remove(jtf_Password);
panel.remove(jlb_Amount);
panel.remove(jcb_Integers);
panel.remove(jcb_Capitals);
panel.remove(jtf_Integers);
panel.remove(jtf_Capitals);
panel.remove(jlb_Length);
panel.remove(jtf_Length);
panel.remove(jbt_Randomize);
panel.remove(jbt_Add);
panel.remove(jbt_Edit);
panel.repaint();
}
public void addLocationUI() {
if (!edit) {
jlb_Location.setText("New Location:");
jlb_Location.setBounds(5, 5, 100, 20);
jlb_Username.setText("New Username:");
jlb_Username.setBounds(5, 45, 100, 20);
jlb_Password.setText("New Password:");
jlb_Password.setBounds(5, 85, 100, 20);
panel.add(jtf_Location);
panel.add(jtf_Username);
panel.add(jtf_Password);
panel.add(jlb_Amount);
panel.add(jcb_Integers);
panel.add(jcb_Capitals);
panel.add(jtf_Integers);
panel.add(jtf_Capitals);
panel.add(jlb_Length);
panel.add(jtf_Length);
panel.add(jbt_Randomize);
panel.add(jbt_Add);
panel.repaint();
} else {
jlb_Location.setText("New Location:");
jlb_Location.setBounds(5, 5, 100, 20);
jlb_Username.setText("New Username:");
jlb_Username.setBounds(5, 45, 100, 20);
jlb_Password.setText("New Password:");
jlb_Password.setBounds(5, 85, 100, 20);
panel.add(jtf_Location);
panel.add(jtf_Username);
panel.add(jtf_Password);
panel.add(jlb_Amount);
panel.add(jcb_Integers);
panel.add(jcb_Capitals);
panel.add(jtf_Integers);
panel.add(jtf_Capitals);
panel.add(jlb_Length);
panel.add(jtf_Length);
panel.add(jbt_Randomize);
panel.add(jbt_Edit);
panel.repaint();
}
}
public String getRandomPassword(int length, int integers, int capitals) {
int lowers = length - (integers + capitals);
String password = "";
String scramble[] = new String[length];
if (capitals != 0) {
for (int i = 0; i < capitals; i++) {
while (true) {
int randomScramble = random.nextInt(length);
if (scramble[randomScramble] == null || scramble[randomScramble].equals("")) {
scramble[randomScramble] = Character.toString(UPPERCASE[random.nextInt(UPPERCASE.length)]);
break;
}
}
}
}
if (integers != 0) {
for (int i = 0; i < integers; i++) {
while (true) {
int randomScramble = random.nextInt(length);
if (scramble[randomScramble] == null || scramble[randomScramble].equals("")) {
scramble[randomScramble] = Character.toString(NUMBERS[random.nextInt(NUMBERS.length)]);
break;
}
}
}
}
for (int i = 0; i < lowers; i++) {
while (true) {
int randomScramble = random.nextInt(length);
if (scramble[randomScramble] == null || scramble[randomScramble].equals("")) {
scramble[randomScramble] = Character.toString(LOWERCASE[random.nextInt(LOWERCASE.length)]);
break;
}
}
}
for (int i = 0; i < length; i++) {
password += scramble[i];
}
return password;
}
public void save() throws IOException {
File dir = new File("C:/PISavior");
if (!dir.exists()) {
dir.mkdir();
}
File myfile = new File("C:/PISavior/myfile.txt");
myfile.delete();
myfile.createNewFile();
PrintWriter output = new PrintWriter(myfile);
output.print(amount + "*");
for (int i = 0; i < amount; i++) {
output.print(locations[i] + "*");
output.print(usernames[i] + "*");
output.print(passwords[i] + "*");
}
output.close();
}
public void load() throws FileNotFoundException {
File myfile = new File("C:/PISavior/myfile.txt");
if (myfile.exists()) {
Scanner input = new Scanner(myfile);
while (input.hasNext())
{
input.useDelimiter("[*]");
amount = input.nextInt();
locations = new String[amount];
usernames = new String[amount];
passwords = new String[amount];
jlb_Locations = new JLabel[amount];
jlb_Usernames = new JLabel[amount];
jlb_Passwords = new JLabel[amount];
for (int i = 0; i < amount; i++) {
locations[i] = input.next();
jlb_Locations[i] = new JLabel(locations[i]);
usernames[i] = input.next();
jlb_Usernames[i] = new JLabel(usernames[i]);
passwords[i] = input.next();
jlb_Passwords[i] = new JLabel(passwords[i]);
}
}
}
}
public void addInformation(String info1, String info2, String info3) {
if (amount == 0) {
amount++;
locations = new String[amount];
usernames = new String[amount];
passwords = new String[amount];
jlb_Locations = new JLabel[amount];
jlb_Usernames = new JLabel[amount];
jlb_Passwords = new JLabel[amount];
locations[0] = info1;
usernames[0] = info2;
passwords[0] = info3;
jlb_Locations[0] = new JLabel(locations[0]);
jlb_Usernames[0] = new JLabel(usernames[0]);
jlb_Passwords[0] = new JLabel(passwords[0]);
} else {
String temp1[] = new String[amount];
String temp2[] = new String[amount];
String temp3[] = new String[amount];
for (int i = 0; i < amount; i++) {
temp1[i] = locations[i];
temp2[i] = usernames[i];
temp3[i] = passwords[i];
}
amount++;
locations = new String[amount];
usernames = new String[amount];
passwords = new String[amount];
jlb_Locations = new JLabel[amount];
jlb_Usernames = new JLabel[amount];
jlb_Passwords = new JLabel[amount];
for (int i = 0; i < temp1.length; i++) {
locations[i] = temp1[i];
usernames[i] = temp2[i];
passwords[i] = temp3[i];
jlb_Locations[i] = new JLabel(temp1[i]);
jlb_Usernames[i] = new JLabel(temp2[i]);
jlb_Passwords[i] = new JLabel(temp3[i]);
}
locations[amount-1] = info1;
usernames[amount-1] = info2;
passwords[amount-1] = info3;
jlb_Locations[amount-1] = new JLabel(info1);
jlb_Usernames[amount-1] = new JLabel(info2);
jlb_Passwords[amount-1] = new JLabel(info3);
}
}
@Override
public void mouseReleased(MouseEvent e) {
int y = e.getY();
if (y > 25 && y < (amount * 20) + 25) {
for (int i = 0; i < amount; i++) {
if (y < (i*20) + 45) {
edit = true;
editLine = i;
jtf_Location.setText(locations[i]);
jtf_Username.setText(usernames[i]);
jtf_Password.setText(passwords[i]);
removeMainUI();
addLocationUI();
}
}
}
}
@Override
public void mouseClicked(MouseEvent me) {
}
@Override
public void mousePressed(MouseEvent me) {
}
@Override
public void mouseEntered(MouseEvent me) {
}
@Override
public void mouseExited(MouseEvent me) {
}
}
