如何在JAVA程序中从数据库中获取特定行和列的值？

import java.sql.*;

String url = "jdbc:mysql://localhost:3306/database_name";
String username = "your_username";
String password = "your_password";

Connection connection = DriverManager.getConnection(url, username, password);

String sql = "SELECT column1, column2 FROM table_name WHERE condition";
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(sql);

while (resultSet.next()) {
    String value1 = resultSet.getString("column1");
    String value2 = resultSet.getString("column2");
    // 处理获取到的值
}

resultSet.close();
statement.close();
connection.close();