gui-新人求解 java GUI寫的界面 按鈕這點不會寫

新人求解 java GUI寫的界面 按鈕這點不會寫

public class Jdbc {
public static Connection getConn(){
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test"", "root", "root");
if (!conn.isClosed()) {
System.out.println("成功連接數據庫");
java.sql.PreparedStatement ps = conn.prepareStatement("select * from users");
ResultSet rs = ps.executeQuery();
while (rs.next()) {
System.out.println("id : " + rs.getInt(1) + " name : " + rs.getString(2) + " role : " + rs.getString(3)

• " password: " + rs.getString(4)); }}} catch (Exception e) { e.printStackTrace(); } return conn; } }

這是連接數據庫的代碼
JButton button_3 = new JButton("查詢");

button_3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {

}
});
怎麼使輸入查詢信息後點擊這個按鈕使數據庫信息顯示出來

最佳回答：

public void selectUser（){
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test"", "root", "root");
if (!conn.isClosed()) {
System.out.println("成功連接數據庫");
java.sql.PreparedStatement ps = conn.prepareStatement("select * from users");
ResultSet rs = ps.executeQuery();
while (rs.next()) {
System.out.println("id : " + rs.getInt(1) + " name : " + rs.getString(2) + " role : " + rs.getString(3)
" password: " + rs.getString(4)); }}} catch (Exception e) { e.printStackTrace(); } return conn; } }

}

接著：
JButton button_3 = new JButton("查詢");

button_3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {

selectUser();
}
});