连接数据库的工具JdbcUtil

 public class JdbcUtil {
     private static String driver=null;//驱动
     private static String url=null;//连接地址
     private static String username=null;//用户名
     private static String password=null;//密码
     static {
         try {
             Properties props=new Properties();
             InputStream ins = JdbcUtil.class.getClassLoader().getResourceAsStream("jdbc.properties");
             props.load(ins);
             driver = props.getProperty("driver");
             url = props.getProperty("url");
             username = props.getProperty("username");
             password = props.getProperty("password");
             Class.forName(driver);
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
     /**
      * Description:获取数据连接<br/>
      * @return yuanQiSheng
      * @throws Exception
      */
     public static Connection getConnection() throws Exception {
         return DriverManager.getConnection("url","username","password");
     }
     /**
      * Description:释放数据库资源<br/>
      * @param conn：Connection
      * @param pres：PreparedStatement
      * @param rs：ResultSet
      */
     public static void release(Connection conn,PreparedStatement pres,ResultSet rs) {
         try {
             if(rs!=null) {
                 rs.close();
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
         try {
             if(pres!=null) {
                 pres.close();
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
         try {
             if(conn!=null) {
                 conn.close();
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
     }