我想将jtextfields中的值插入到我的数据库中。但是发生了以下错误。用户''@ localhost'对数据库'employee'的访问被拒绝任何解决方案？
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
public class DataEntry implements ActionListener{
Connection conn = null;
Statement stmt = null;
// Database credentials
//Create and set up the window.
JFrame mainframe=new JFrame("Database Operation");
JPanel mainpanel=new JPanel();
JButton insertbtn=new JButton("Insert");
JButton viewbtn=new JButton("View");
JLabel label1=new JLabel("ID: ");
JLabel label2=new JLabel("Age: ");
JLabel label3=new JLabel("");
JFrame insertframe=new JFrame("Insert into Database");
JPanel insertpanel=new JPanel();
JLabel idlabel=new JLabel(" id");
JTextField idtext=new JTextField(20);
JLabel agelabel=new JLabel(" age");
JTextField agetext=new JTextField(20);
JButton insertsubmit=new JButton("Submit");
JFrame viewframe=new JFrame("View Database Data");
JPanel viewpanel=new JPanel();
Vector datacol=new Vector();
Vector datarow=new Vector();
JTable datatable;
JScrollPane viewdata;
public void init()
{
mainwindow();
}
public void mainwindow()
{
mainpanel.setBackground(Color.GRAY);
mainpanel.setLayout(null);
insertbtn.setBounds(300, 300, 100, 30);
viewbtn.setBounds(800, 300, 100, 30);
mainpanel.add(insertbtn);
mainframe.add(mainpanel);
mainframe.setSize(1350, 700);
mainframe.setVisible(true);
insertbtn.addActionListener(this); }
public void insertwindow()
{
insertpanel.setBackground(Color.GRAY);
idlabel.setForeground(Color.WHITE);
agelabel.setForeground(Color.WHITE);
insertpanel.setLayout(null);
idlabel.setBounds(400, 150, 100, 20);
idtext.setBounds(550, 150, 150, 30);
agelabel.setBounds(400, 200, 100, 20);
agetext.setBounds(550, 200, 150, 30);
insertsubmit.setBounds(490, 300, 100, 30);
insertpanel.add(idlabel);
insertpanel.add(idtext);
insertpanel.add(agelabel);
insertpanel.add(agetext);
insertpanel.add(insertsubmit);
insertframe.add(insertpanel);
insertframe.setSize(1350, 700);
insertframe.setVisible(true);
insertsubmit.addActionListener(this);
insertframe.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
mainframe.setVisible(true);
}
}
);
}
public void viewwindow()
{
datacol.removeAllElements();
datarow.removeAllElements();
OpenDatabase();
try
{
Statement st=conn.createStatement();
ResultSet rs=st.executeQuery("select id,age from employee");
ResultSetMetaData rms=rs.getMetaData();
int cols=rms.getColumnCount();
for(int i=1;i<=cols;i++)
{
datacol.addElement(rms.getColumnName(i));
}
while(rs.next())
{
Vector row=new Vector(cols);
for(int i=1;i<=cols;i++)
{
row.addElement(rs.getObject(i));
}
datarow.addElement(row);
}
datatable=new JTable(datarow,datacol);
viewdata=new JScrollPane(datatable);
}
catch(Exception e)
{
JOptionPane.showConfirmDialog(null, "Problem in Database connectivity or Data", "Result", JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE);
}
viewpanel.setBackground(Color.GRAY);
viewpanel.setLayout(null);
viewdata.setBounds(20, 50, 1250, 600);
viewpanel.add(viewdata);
viewframe.add(viewpanel);
viewframe.setSize(1350, 700);
viewframe.setVisible(true);
viewframe.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
mainframe.setVisible(true);
}
});}
public void insertdata(String id, String age)
{
try
{
Statement st=conn.createStatement();
st.executeUpdate("insert into employee values("+id+",'"+age+")");
JOptionPane.showConfirmDialog(null, "Your Data Has been Inserted", "Result", JOptionPane.DEFAULT_OPTION,JOptionPane.PLAIN_MESSAGE);
}
catch(Exception e)
{
JOptionPane.showConfirmDialog(null, "Problem in Database connectivity or Data", "Result", JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE);
}
}
public void OpenDatabase()
{
try
{
Class.forName("com.mysql.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://localhost/employee");
}
catch(Exception e)
{
System.out.println(e);
}
}
public void CloseDatabase()
{
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}public void actionPerformed(ActionEvent arg0) {
if(arg0.getSource()==insertbtn)
{
mainframe.setVisible(false);
insertwindow();
}
if(arg0.getSource()==viewbtn)
{
mainframe.setVisible(false);
viewwindow();
}if(arg0.getSource()==insertsubmit)
{
String id=idtext.getText();
String age=agetext.getText();
try
{
OpenDatabase();
insertdata(id,age);
CloseDatabase();
}
catch(Exception e)
{
System.out.println(e);
}
idtext.setText("");
agetext.setText("");}}
public static void main(String args[])
{
DataEntry dm=new DataEntry();
dm.init();
}
}
答案 0 :(得分：1)
你有
的问题 conn=DriverManager.getConnection("jdbc:mysql://localhost/employee");
DriverManager.getConnection()'参数设置应该像
DriverManager.getConnection("jdbc:mysql://hostname:port/dbname","username", "password");
如果您的mysql具有默认设置并且您使用root用户，那么它应该是
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/employee","root", "your password");
答案 1 :(得分：0)
在getConnection方法中提供用户ID和密码
conn=DriverManager.getConnection("jdbc:mysql://localhost/employee","root","password");
“root”作为我的sql的用户ID（在yor系统中） 和“密码”作为我的sql的密码（在你的系统中）
答案 2 :(得分：0)
使用用户名＆amp; getConnection方法中的mysql数据库的密码
conn=DriverManager.getConnection("jdbc:mysql://localhost/employee");
作为
conn=DriverManager.getConnection("jdbc:mysql://localhost/employee","root","password");