java入门

 1 private String driverClassName;
 2     private String url;
 3     private String username;
 4     private String password;
 5     private Connection conn;
 6 
 7     @Before
 8     public void before() {
 9         driverClassName = "com.mysql.jdbc.Driver";
10         url = "jdbc:mysql://localhost:3306/test";
11         username = "root";
12         password = "root";
13     }
14 
15     @Test
16     /**
17      * 测试获取数据库连接
18      */
19     public void testGetConnection() throws SQLException {
20         DataSource ds = new DataSource(driverClassName, url, username, password);
21         conn = ds.getConnection();
22         System.out.println("conn:" + conn);
23 
24     }
25 
26     @After
27     public void after() {
28         if (conn != null) {
29             try {
30                 conn.close();
31                 System.out.println("关闭成功！");
32             } catch (SQLException e) {
33                 e.printStackTrace();
34             }
35         }
36     }