一个简单封装的jdbc工具类

[java]
import java.sql.*;
import javax.sql.*;

public final class JdbcUtil {

    /**
     * @param args
     */
    private static String url = "jdbc:mysql://localhost:3306/jdbc"; // jdbc:mysql:///jdbc 本地默认端口可以省略
    private static String user = "root"; www.zzzyk.com
    private static String password = "123456";

    private JdbcUtil() { }

    static {
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            throw new ExceptionInInitializerError(e);
        }
    }

    public static Connection getConnection() throws SQLException{
        return DriverManager.getConnection(url, user, password);
    }

    public static void free(ResultSet rs, Statement st, Connection conn) {
        try {
            if (rs != null) {
                rs.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (st != null) {
                    st.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            } finally {
                if (conn != null) {
                    try {
                        conn.close();
                    } catch (SQLException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}

static块用来注册驱动

getConnection函数用来获取连接

free函数用来安全的释放资源

补充：软件开发 , Java ,