Druid连接池工具类

Druid连接池工具类
创建Druid连接池工具类：DruidJdbcUtils。

/**
 * Druid连接池的工具类
 */
public class DruidJdbcUtils {
    //定义成员变量
    private static DataSource ds;
    //static代码块
    static {
        //加载配置文件
        Properties pos = new Properties();
        InputStream is = DruidJdbcUtils.class.getClassLoader().getResourceAsStream("druid.properties");
        try {
            pos.load(is);
            //获取DataSource
            ds = DruidDataSourceFactory.createDataSource(pos);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    /**
     * 获取连接
     * @return
     * @throws SQLException
     */
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    /**
     * 释放资源
     * @param stmt
     * @param conn
     */
    public static void close(Statement stmt, Connection conn) {
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();  //归还连接
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 释放资源
     * @param rs
     * @param stmt
     * @param conn
     */
    public static void close(ResultSet rs, Statement stmt, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();  //归还连接
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    /**
     * 获取连接池方法
     */
    public static DataSource getDataSource(){
        return ds;
    }
}

测试Druid连接池工具类
使用连接池工具来对account表插入数据进行测试。

/**
 * 使用Druid工具类
 */
public class DruidDemo2 {
    public static void main(String[] args) {
//        DruidJdbcUtils druidJdbcUtils = new DruidJdbcUtils();
        Connection conn = null;
        try {
            //获取连接
            conn = DruidJdbcUtils.getConnection();
            //定义sql
            String sql = "insert into account values(null,?,?)";
            //获取执行sql对象
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1,"wangwu");
            pstmt.setDouble(2,3000);
            int i = pstmt.executeUpdate();
            System.out.println(i);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}