jdbc连接数据库，欢迎提出更好的方案

 1 package com.lt.grtg.util;

 2 

 3 import java.io.IOException;

 4 import java.io.InputStream;

 5 import java.sql.Connection;

 6 import java.sql.DriverManager;

 7 import java.sql.PreparedStatement;

 8 import java.sql.ResultSet;

 9 import java.sql.SQLException;

10 import java.util.Properties;

11 

12 public class DBUtil {

13     

14     /**

15      * 连接URL

16      */

17     private static String url;

18     /**

19      * 数据库连接用户名

20      */

21     private static String username;

22     /**

23      * 数据库连接密码

24      */

25     private static String password;

26 

27     static{

28         //加载数据库配置文件

29         InputStream inputStream = 

30                 DBUtil.class.getClassLoader().getResourceAsStream(properties文件路径);

31         Properties properties = new Properties();

32         try {

33             properties.load(inputStream);

34             url = properties.getProperty("url");

35             username = properties.getProperty("username");

36             password = properties.getProperty("password");

37             Class.forName(properties.getProperty("driver"));

38         } catch (IOException e) {

39             e.printStackTrace();

40             throw new RuntimeException("加载db.properties文件失败");

41         } catch (ClassNotFoundException e) {

42             e.printStackTrace();

43             throw new RuntimeException("未找到db.properties文件中driver属性配置的数据库驱动文件");

44         }

45     }

46     

47     /**

48      * 获取数据库连接

49      * @return Connection    数据库连接

50      * @throws SQLException 数据库连接异常

51      */

52     public static Connection getConnection() throws SQLException {

53         return DriverManager.getConnection(url, username, password);

54     }

55     

56     /**

57      * 关闭数据库连接

58      * @param resultSet    结果集

59      * @param preparedStatement    

60      * @param connection 数据库连接

61      */

62     public static void closeConnection(ResultSet resultSet,

63             PreparedStatement preparedStatement,Connection connection){

64         try {

65             //按顺序关闭JDBC对象：resultSet、preparedStatement、connection

66             if (resultSet != null) {

67                 resultSet.close();

68             }

69             if (preparedStatement != null) {

70                 preparedStatement.close();

71             }

72             if (connection != null) {

73                 connection.close();

74             }

75         } catch (SQLException e) {

76             e.printStackTrace();

77             throw new RuntimeException("关闭数据库连接失败");

78         }

79     }

80     

81 }