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如何解决classnotfoundexception(22个答案）
连接到数据库时出错：（使用org.gjt.mm.mysql.driver类）（3个答案）
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我做了一个简单的表单，让用户输入客户数据，它将文本字段中的数据插入到我运行的microsoftsqlservermanagementstudio18的数据库中。数据库正在我的计算机上运行。我的代码的驱动程序部分有问题，它不断抛出异常。非常感谢你对我所做错事的任何帮助。这是我每次运行程序并点击提交按钮时收到的以下消息：抛出异常：com.microsoft.sqlserver.jdbc.sqlserverdriver java.lang.classnotfoundexception:com.microsoft.sqlserver.jdbc.sqlserverdriver问题的完整堆栈跟踪：atjava.base/jdk.internal.loader.builtinclassloader.loadclass（builtinclassloader。java:602)在java.base/jdk.internal.loader.classloaders$appclassloader.loadclass（classloaders。java:178)在java.base/java.lang.classloader.loadclass（classloader。java:521)位于java.base/java.lang.class.forname0（本机方法）java.base/java.lang.class.forname（类。java:333)在dbfe2.actionperformed（dbfe2。java:119)在java.desktop/javax.swing.abstractbutton.fireactionperformed（abstractbutton。java:1967)在java.desktop/javax.swing.abstractbutton$handler.actionperformed（abstractbutton。java:2308)在java.desktop/javax.swing.defaultbuttonmodel.fireactionperformed（defaultbuttonmodel。java:405)在java.desktop/javax.swing.defaultbuttonmodel.setpressed（defaultbuttonmodel。java:262)在java.desktop/javax.swing.plaf.basic.basicbuttonlistener.mousereleased（basicbuttonlistener。java:279)在java.desktop/java.awt.component.processmouseevent（组件。java:6636)在java.desktop/javax.swing.jcomponent.processmouseevent（jcomponent。java:3342)在java.desktop/java.awt.component.processevent（component。java:6401)在java.desktop/java.awt.container.processevent（container。java:2263)在java.desktop/java.awt.component.dispatcheventimpl（组件。java:5012)在java.desktop/java.awt.container.dispatcheventimpl（container。java:2321)在java.desktop/java.awt.component.dispatchevent（component。java:4844)在java.desktop/java.awt.lightweightdispatcher.RetargeMouseeEvent（容器。java:4918)在java.desktop/java.awt.lightweightdispatcher.processmouseevent（容器。java:4547)在java.desktop/java.awt.lightweightdispatcher.dispatchevent（container。java:4488)在java.desktop/java.awt.container.dispatcheventimpl（container。java:2307)在java.desktop/java.awt.window.dispatcheventimpl（窗口。java:2762)在java.desktop/java.awt.component.dispatchevent（组件。java:4844)在java.desktop/java.awt.eventqueue.dispatcheventimpl（eventqueue。java:772)在java.desktop/java.awt.eventqueue$4.run（eventqueue。java:721)在java.desktop/java.awt.eventqueue$4.run（eventqueue。java:715)在java.base/java.security.accesscontroller.doprivileged（accesscontroller。java:391)在java.base/java.security.protectiondomain$javasecurityaccessimpl.dointersectionprivilege（protectiondomain。java:85)在java.base/java.security.protectiondomain$javasecurityaccessimpl.dointersectionprivilege（protectiondomain。java:95)在java.desktop/java.awt.eventqueue$5.run（eventqueue。java:745)在java.desktop/java.awt.eventqueue$5.run（eventqueue。java:743)在java.base/java.security.accesscontroller.doprivileged（accesscontroller。java:391)在java.base/java.security.protectiondomain$javasecurityaccessimpl.dointersectionprivilege（protectiondomain。java:85)在java.desktop/java.awt.eventqueue.dispatchevent（事件队列）。java:742)在java.desktop/java.awt.eventdispatchthread.pumponeeventforfilters（eventdispatchthread。java:203)在java.desktop/java.awt.eventdispatchthread.pumpeventsforfilter（eventdispatchthread。java:124)在java.desktop/java.awt.eventdispatchthread.pumpeventsforhierarchy（eventdispatchthread。java:113)在java.desktop/java.awt.eventdispatchthread.pumpevents（eventdispatchthread。java:109)在java.desktop/java.awt.eventdispatchthread.pumpevents（eventdispatchthread。java:101)在java.desktop/java.awt.eventdispatchthread.run（eventdispatchthread。java:90)

package Assignments;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;//import all
import java.sql.*;//need this to make database connection

public class DataBaseFormExample extends JPanel implements ActionListener
{
    private JLabel FirstNameLabel;
    private JTextField FirstNameTextField;
    private JLabel LastNameLabel;
    private JTextField LastNameTextField;
    private JLabel PhoneNumLabel;
    private JTextField PhoneNumTextField;
    private JLabel StreetAddressLabel;
    private JTextField StreetAddressTextField;
    private JLabel StateLabel;
    private JTextField StateTextField;
    private JLabel CityLabel;
    private JTextField CityTextField;
    private JLabel ZipLabel;
    private JTextField ZipTextField;
    private JLabel GenderLabel;
    private JTextField GenderTextField;
    private JLabel DOBLabel;
    private JTextField DOBTextField;
    private JLabel MaritalStatusLabel;
    private JTextField MartialStatusTextField;

    //constructor
    public DataBaseFormExample()
    {
        //intializing components for form below
        FirstNameLabel = new JLabel("Enter the first name of Customer below:");
        FirstNameTextField = new JTextField("FirstName");
        FirstNameTextField.setColumns(10);
        LastNameLabel  = new JLabel("Enter the first name of Customer below:");
        LastNameTextField = new JTextField("LastName");
        LastNameTextField.setColumns(10);
        PhoneNumLabel = new JLabel("Enter the Phone Number of Customer below(EX:123-456-7890):");
        PhoneNumTextField = new JTextField("123-456-7890");
        PhoneNumTextField.setColumns(10);
        StreetAddressLabel  = new JLabel("Enter the street address of Customer below:");
        StreetAddressTextField = new JTextField("123 easy street");
        StreetAddressTextField.setColumns(10);
        StateLabel = new JLabel("Enter the state of Customer below(EX:PA):");
        StateTextField = new JTextField("PA");
        StateTextField.setColumns(10);
        CityLabel = new JLabel("Enter the city of Customer below(EX:Pittsburgh):");
        CityTextField = new JTextField("Pittsburgh");
        CityTextField.setColumns(10); 
        ZipLabel = new JLabel("Enter the zip of Customer below(EX:12345):");
        ZipTextField = new JTextField("12345");
        ZipTextField.setColumns(10); 
        GenderLabel = new JLabel("Enter the gender of Customer below(EX:M or F):");
        GenderTextField = new JTextField("M");
        GenderTextField.setColumns(10); 
        DOBLabel = new JLabel("Enter the DOB of Customer below(EX:12/03/5678):");
        DOBTextField = new JTextField("12/34/2010");
        DOBTextField.setColumns(10); 
        MaritalStatusLabel = new JLabel("Enter the martial status of Customer below(EX: Single / Married):");
        MartialStatusTextField = new JTextField("Single");
        MartialStatusTextField.setColumns(10); 
        JButton submitBTN = new JButton("Submit info");
        submitBTN.addActionListener(this);
        //add components to form
        add(FirstNameLabel);
        add(FirstNameTextField);
        add(LastNameLabel);
        add(LastNameTextField);
        add(PhoneNumLabel);
        add(PhoneNumTextField);
        add(StreetAddressLabel);
        add(StreetAddressTextField);
        add(StateLabel);
        add(StateTextField);
        add(CityLabel);
        add(CityTextField);
        add(ZipLabel);
        add(ZipTextField);
        add(GenderLabel);
        add(GenderTextField);
        add(DOBLabel);
        add(DOBTextField);
        add(MaritalStatusLabel);
        add(MartialStatusTextField);
        add(submitBTN);
    }
    //driver method
    public static void CreateAndShowContent()
    {
         //frame of calculator
        JFrame window = new JFrame("Customer Information Input Form");
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//closes when we click the red x
        DataBaseFormExample  content = new DataBaseFormExample ();
        content.setOpaque(true);
        window.setContentPane(content);
        //size it to fit components
        window.setSize(500,330);
        //show it
        window.setVisible(true);
    }
    //insert when the button submit is pressed
    public void actionPerformed(ActionEvent e)
    {
        try
        {
            //try inserting data to database
            String JDBC_DRIVER = "org.gjt.mm.mysql.Driver";
            String DB_URL = "jdbc:mysql://localhost/Giant_Snail_Grocery";
            String UserName = "username";
            String UserPass = "password";
            Connection conn = null;
            Statement statement = null;
            Class.forName(JDBC_DRIVER);
            System.out.println("Class.forName(driver) accepted....");
            conn = DriverManager.getConnection(DB_URL,UserName,UserPass);
            System.out.println("Connection Made....");
            statement = conn.createStatement();
            System.out.println("Statement object created from conn....");
            //String sql = "INSERT INTO CUSTOMER " +"VALUES('Todd','Packer','724-345-9876','134 west end road','PA','Pittsburgh','12356','M','12/21/1995','married');";
            String sql2 = "INSERT INTO CUSTOMER " + "VALUES("+ FirstNameTextField.getText() + " , " + LastNameTextField.getText() + ", " + PhoneNumTextField.getText() + ", " + StreetAddressTextField.getText() + ", " + StateTextField.getText() + ", " + CityTextField.getText() + ", " + ZipTextField.getText() + "," + GenderTextField.getText() + ", " + DOBTextField.getText() + ", " + MartialStatusTextField.getText() + ");";
            statement.executeUpdate(sql2);
            System.out.println("Insert successful to database....");
            if(statement != null)
            {
                conn.close();
                System.out.println("Connection closed to database....");
            }
        }
        catch(Exception p)
        {
            //catch any exceptions
            System.out.println("Exception thrown: " + p.getMessage());
        } 
    }
    //Main
    public static void main(String[] args) 
    {
        javax.swing.SwingUtilities.invokeLater(new Runnable()
        {
           public void run()
            {
                CreateAndShowContent();
            }
        });
    } 
}