properties配置文件

1 driver=com.mysql.jdbc.Driver
2 url=jdbc:mysql://localhost:3306/jdbctest
3 user=root
4 password=root

 1 package jdbc;
 2 
 3 import java.io.IOException;
 4 import java.io.InputStream;
 5 import java.sql.Connection;
 6 import java.sql.DriverManager;
 7 import java.util.Properties;
 8 
 9 /**
10  * <p>
11  * Description:JDBCUtils工具类
12  * </p>
13  * 
14  * @author Administrator
15  * @date 2018年11月4日下午3:03:18
16  */
17 public class JDBCUtils {
18     private static String driver;
19     private static String url;
20     private static String user;
21     private static String password;
22     // 静态代码块
23     static {
24         try {
25             readConfig();
26         } catch (Exception e) {
27             e.printStackTrace();
28         }
29     }
30 
31     // 读取配置文件
32     private static void readConfig() throws IOException {
33         InputStream in = JDBCUtils.class.getClassLoader().getResourceAsStream("database.properties");
34         Properties prop = new Properties();
35         prop.load(in);
36         // 使用getProperties(key)，通过key获得需要的值
37         driver = prop.getProperty("driver");
38         url = prop.getProperty("url");
39         user = prop.getProperty("user");
40         password = prop.getProperty("password");
41     }
42 
43     public static Connection getConnection() {
44         try {
45             // 1、注册驱动
46             Class.forName(driver);
47             // 2、获得连接
48             Connection conn = DriverManager.getConnection(url, user, password);
49             // 返回连接
50             return conn;
51         } catch (Exception e) {
52             throw new RuntimeException(e);
53         }
54     }
55 }