因此我在树莓派上有一个名为barberDB的数据库。我可以使用MySQL Workbench从笔记本电脑通过ssh访问它，并且一切正常。但是现在我想通过Java代码在barberDB中写入数据。我已经写了一些类，但是出现以下错误java.sql.SQLException: Access denied for user 'root'@'localhost'
我有一个IOManager，在其中执行MySQL的工作。 ssh是在SSHManager中完成的，我的主应用程序创建了它们的实例，并试图从数据库中获取数据。使用便携式计算机上本地语言的测试数据库时，sql查询为我提供了信息，因此我认为使用ssh连接也可以。
public class IOManager {
public IOManager() {
}
Connection connection;
public boolean connectToMySql() {
try {
//Class.forName("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/barberDB?useSSL=false&useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC", "root", "Demo_pw9");
return true;
}catch (Exception e) {
e.printStackTrace();
return false;
}
}
public void closeConnection() throws SQLException {
connection.close();
}
public Vector loadCustomers(){
Statement stmt = null;
ResultSet result = null;
try {
stmt = connection.createStatement();
result = stmt.executeQuery("SELECT * FROM CUSTOMER");
result.first(); // <- first entry of the result set
// STEP 2: copy the data from the result set into the vector
Vector customers = new Vector();
while(!result.isAfterLast()) // as long as valid data is in the result set
{
int id = result.getInt("ID");
String name = result.getString("name");
int isHaircut = result.getInt("isHaircut");
int isBeard = result.getInt("isBeard");
int isEyebrows = result.getInt("isEyebrows");
int barberId = result.getInt("BARBER_ID");
Kunde kunde = new Kunde(id, name, isHaircut, isBeard, isEyebrows, barberId);
customers.add(kunde);
result.next(); // go to next line in the customer table
}
// STEP 3: return the vector containing the customer data
return customers;
} catch (Exception ex) {
System.out.println("Error during access + customern" + ex.getMessage());
return null;
}
}
public Vector loadBarbers(){
Statement stmt = null;
ResultSet result = null;
try {
stmt = connection.createStatement();
result = stmt.executeQuery("SELECT * FROM barber");
result.first(); // <- first entry of the result set
// STEP 2: copy the data from the result set into the vector
Vector barbers = new Vector();
while(!result.isAfterLast()) // as long as valid data is in the result set
{
int id = result.getInt("barberID");
String name = result.getString("barberName");
Barber barber = new Barber(id, name);
barbers.add(barber);
result.next(); // go to next line in the customer table
}
// STEP 3: return the vector containing the customer data
return barbers;
} catch (Exception ex) {
System.out.println("Error during access + barbern" + ex.getMessage());
return null;
}
}
这是我的IOManager。
public class SSHManager {
private String user;
private String password;
private String host;
private int port;
private String dbPath;
private ChannelSftp sftpChannel;
public SSHManager(String user, String password, String host, int port, String dbPath) {
this.user = user;
this.password = password;
this.host = host;
this.port = port;
this.dbPath = dbPath;
}
public void sshConnect() {
try {
JSch jsch = new JSch();
Session session = jsch.getSession(user, host, port);
session.setPassword(password);
session.setConfig("StrictHostKeyChecking", "no");
System.out.println("Establishing Connection...");
session.connect();
System.out.println("Connection established.");
System.out.println("Crating SFTP Channel.");
sftpChannel = (ChannelSftp) session.openChannel("sftp");
sftpChannel.connect();
System.out.println("SFTP Channel created.");
/*InputStream inputStream = sftpChannel.get(dbPath);
try (Scanner scanner = new Scanner(new InputStreamReader(inputStream))) {
while (scanner.hasNextLine()) {
String line = scanner.nextLine();
System.out.println(line);
}
}*/
} catch (JSchException e) {
e.printStackTrace();
}
}
public ChannelSftp getSftp() {
return this.sftpChannel;
}
}
这是SSHManager。扫描程序部分只是互联网上用于测试目的的一些代码段。
public class TestApp extends AConstants{
static int customerCount = 1;
public static void main(String args[]){
int clmBarber = 1;
JFrame frame = new JFrame("BURSEM APPLICATION");
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
frame.setUndecorated(true);
frame.setVisible(true);
//frame.setUndecorated(true);
double sizeX[] = {BORDER_WIDTH, BARBERNAME_WIDTH, BARBERNAME_WIDTH, BARBERNAME_WIDTH, BARBERNAME_WIDTH, BORDER_WIDTH}; // Columns
double sizeY[] = {BORDER_HEIGHT, BARBERNAME_HEIGHT, BARBER_TOTAL_HEIGHT, CUSTOMER_HEIGHT, CUSTOMER_HEIGHT, CUSTOMER_HEIGHT, CUSTOMER_HEIGHT, CUSTOMER_HEIGHT, CUSTOMER_HEIGHT, CUSTOMER_HEIGHT, BORDER_HEIGHT}; // Rows
frame.setLayout(new TableLayout(new double[][] {sizeX,sizeY}));
frame.getContentPane().setBackground(Color.BLACK);
SSHManager sshManager = new SSHManager("ubuntu", "root12345", "192.168.178.99", 22, "");
sshManager.sshConnect();
IOManager iom = new IOManager();
if(iom.connectToMySql() == false)
return;
setBarberLabel(frame, iom);
setCustomerPanel(frame, iom);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public static JLabel getBarberNameLabel(String barberName) {
JLabel barberNameLabel = new JLabel(barberName, SwingConstants.CENTER);
barberNameLabel.setOpaque(false);
barberNameLabel.setForeground(Color.WHITE);
Map<TextAttribute, Object> attributes = new HashMap<TextAttribute, Object>();
attributes.put(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
barberNameLabel.setFont(barberNameLabel.getFont().deriveFont(LARGE_FONT));
return barberNameLabel;
}
public static JPanel getBarberTotalPanel(int totalQueue, int totalTime) {
double[] barberTotalX = new double[] {TableLayout.PREFERRED};
double[] barberTotalY = new double[] {TableLayout.PREFERRED, 30, TableLayout.PREFERRED};
JPanel barberTotalPanel = new JPanel();
barberTotalPanel.setLayout(new TableLayout(new double[][] {barberTotalX, barberTotalY}));
barberTotalPanel.setOpaque(true);
barberTotalPanel.setBackground(ROW_COL_ONE);
JLabel barberQueueTotalLabel = new JLabel("KUNDEN: " + String.valueOf(totalQueue), SwingConstants.LEFT);
barberQueueTotalLabel.setOpaque(false);
barberQueueTotalLabel.setFont(barberQueueTotalLabel.getFont().deriveFont(MEDIUM_FONT));
barberTotalPanel.add(barberQueueTotalLabel, "0,0");
JLabel barberTimeTotalLabel = new JLabel("GESAMTZEIT: " + String.valueOf(totalTime) + " Min", SwingConstants.LEFT);
barberTimeTotalLabel.setOpaque(false);
barberTimeTotalLabel.setFont(barberQueueTotalLabel.getFont().deriveFont(MEDIUM_FONT));
barberTotalPanel.add(barberTimeTotalLabel, "0,2");
return barberTotalPanel;
}
public static JPanel getCustomerPanel(String customerName,boolean isHaircut, boolean isBeard, boolean isEyebrows) {
double[] customerX = new double[] {TableLayout.PREFERRED, TableLayout.PREFERRED, TableLayout.PREFERRED};
double[] customerY = new double[] {TableLayout.PREFERRED, TableLayout.PREFERRED, TableLayout.PREFERRED};
int customerTime = 0;
JPanel customerPanel = new JPanel();
customerPanel.setLayout(new TableLayout(new double[][] {customerX, customerY}));
customerPanel.setOpaque(true);
if(customerCount % 2 != 0) {
customerPanel.setBackground(ROW_COL_TWO);
}else {
customerPanel.setBackground(ROW_COL_ONE);
}
JLabel customerNameLabel = new JLabel(customerName, SwingConstants.LEFT);
customerNameLabel.setOpaque(false);
customerNameLabel.setFont(customerNameLabel.getFont().deriveFont(MEDIUM_FONT));
customerPanel.add(customerNameLabel, "0,0");
JCheckBox customerHaircutCheckbox = new JCheckBox("Haarschnitt");
customerHaircutCheckbox.setOpaque(false);
customerHaircutCheckbox.setSelected(isHaircut);
customerPanel.add(customerHaircutCheckbox, "0,1");
JCheckBox customerBeardCheckbox = new JCheckBox("Bart");
customerBeardCheckbox.setOpaque(false);
customerBeardCheckbox.setSelected(isBeard);
customerPanel.add(customerBeardCheckbox, "1,1");
JCheckBox customerEyebrowsCheckbox = new JCheckBox("Augenbrauen");
customerEyebrowsCheckbox.setOpaque(false);
customerEyebrowsCheckbox.setSelected(isEyebrows);
customerPanel.add(customerEyebrowsCheckbox, "2,1");
if(isHaircut) {
customerTime += 30;
}
if(isBeard) {
customerTime += 15;
}
if(isEyebrows) {
customerTime += 15;
}
JLabel customerTimeLabel = new JLabel("Dauer: " + customerTime + " Min", SwingConstants.LEFT);
customerTimeLabel.setOpaque(false);
customerTimeLabel.setFont(customerNameLabel.getFont().deriveFont(MEDIUM_FONT));
customerPanel.add(customerTimeLabel, "0,2");
customerCount++;
return customerPanel;
}
public static void setCustomerPanel(JFrame frame, IOManager iom) {
int rowCustomer = 3;
Vector kunden = iom.loadCustomers();
Enumeration e = kunden.elements();
while(e.hasMoreElements()){
Kunde customer = (Kunde) e.nextElement();
System.out.println(customer);
frame.add(getCustomerPanel(customer.getName(), customer.getIsHaircut(), customer.getIsBeard(), customer.getIsEyebrows()), "1,"+rowCustomer);
System.out.println(rowCustomer);
rowCustomer++;
}
}
public static void setBarberLabel(JFrame frame, IOManager iom) {
int clmBarber = 1;
Vector barbers = iom.loadBarbers();
Enumeration e = barbers.elements();
while(e.hasMoreElements()){
Barber barber = (Barber) e.nextElement();
System.out.println(barber);
frame.add(getBarberNameLabel(barber.getName()), clmBarber+",1");
System.out.println(clmBarber);
clmBarber++;
}
}
这是我的主要应用程序。很抱歉，如果这个问题有点太长，希望它可以解决。