java 连接oracle数据库代码

这是一个简单的 Java 连接 Oracle 数据库的代码示例：

import java.sql.*;

public class OracleConnection {
    public static void main(String[] args) {
        try {
            // Load Oracle JDBC driver
            Class.forName("oracle.jdbc.driver.OracleDriver");
            
            // Connect to Oracle database
            String url = "jdbc:oracle:thin:@localhost:1521:xe"; // Replace with your database URL
            String user = "username"; // Replace with your username
            String password = "password"; // Replace with your password
            Connection con = DriverManager.getConnection(url, user, password);
            
            // Execute SQL query
            Statement stmt = con.createStatement(); 
            ResultSet rs = stmt.executeQuery("SELECT * FROM employees"); // Replace with your table name
            
            // Process query result
            while (rs.next()) {
                System.out.println(rs.getString(1) + " " + rs.getString(2)); // Replace with your column names
            }
            
            // Close resources
            rs.close();
            stmt.close();
            con.close();
        } catch(Exception e) {
            System.out.println(e);
        }
    }
}

你需要先下载并安装 Oracle JDBC 驱动程序，然后将其添加到类路径中。在上面的代码中，替换 URL、用户名、密码和查询语句以适应你的数据库。