JDBCUtil for oracle 工具类

package com.crh.utils;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JdbcUtils {
    //用户名
    private static String user = "stutest";
    //密码
    private static String password = "111111";
    //jdbcUrl---->> jdbc:oracle:thin:@地址:端口号:实例名
    private static String url = "jdbc:oracle:thin:@localhost:1521:orcl";
    //oracle驱动
    private static String jdbc_driver = "oracle.jdbc.OracleDriver";
    // 静态块加载oracle数据库的驱动
    static {
        try {
            Class.forName(jdbc_driver);
        } catch (ClassNotFoundException e) {
            // TODO handle exception
            throw new ExceptionInInitializerError(e);
        }
    }

    /**
     * 创建连接
     * 
     * @return
     * @throws SQLException 抛出异常，给要调用的地方处理
     */
    public static Connection getConnection() throws SQLException {
        Connection conn = DriverManager.getConnection(url, user, password);
        return conn;
    }

    /**
     * 关闭连接(释放连接)
     * 
     * @param res
     *            结果集
     * @param st
     *            用于执行静态 SQL 语句并返回它所生成结果的对象（PreparedStatement
     *            继承了Statement，PreparedStatement是预编译的更加的灵活）
     * @param conn
     *            连接
     */
    public static void free(ResultSet res, Statement st, Connection conn) {
        try {
            if (res != null) {
                res.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (st != null)
                    st.close();
            } catch (Exception e) {
                if (conn != null)
                    try {
                        conn.close();
                    } catch (SQLException e1) {
                        e1.printStackTrace();
                    }
            }
        }

    }
}