felayman——jdbc连接数据库的最佳结构

package cn.felay.xyhdt.utils;

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

import org.junit.Test;
/**
 * 该类是数据库的工具类
 * @author FelayMan
 *
 */
public class GetConn {
	private static String url = "jdbc:mysql://localhost:3306/android";
	private static String user = "root";
	private static String password = "felayman";
	static {
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			throw new ExceptionInInitializerError(e);
		}
	}
	/**
	 * 获取数据库连接
	 * 
	 * @return
	 * @throws SQLException
	 */
	@Test
	public static Connection getConn() throws SQLException {
		return DriverManager.getConnection(url, user, password);
	}

	/**
	 * 释放资源
	 * 
	 * @param rs
	 * @param st
	 * @param conn
	 */
	public static void freeConn(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();
					}
			}
		}
	}
}