//需要引用的jar包有4个，分别是commons-pool2-2.4.2.jar、commons-dbcp2-2.1.1.jar、mysql-connector-java-5.1.42-bin.jar、commons-logging-1.2.jar
 //缺少一个都会报错（Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/pool2/PooledObjectFactory）意思是找不到这个包
 //需要自己去官网下这几个包
 //连接池是通过BasicDataSource对象对连接池进行管理的，我们需要把关于数据库的关键信息设置给连接池，跟jdbc一样，初始化后，其余的操作就跟jdbc一样了

 1 import java.sql.Connection;
 2 import java.sql.ResultSet;
 3 import java.sql.SQLException;
 4 import java.sql.Statement;
 5 
 6 import org.apache.commons.dbcp2.BasicDataSource;
 7 
 8 /**
 9  * @author 神余健芝
10  * @date 创建时间：2017年5月19日 下午7:00:04
11  */
12 public class DBPoolTest {
13 
14     public static BasicDataSource ds = null;
15 
16     public final static String DRIVER_NAME = "com.mysql.jdbc.Driver";
17     public final static String USER_NAME = "root";
18     public final static String PASSWORD = "123456";
19     public final static String DB_URL = "jdbc:mysql://localhost/shen_db?useUnicode=true&characterEncoding=utf-8&useSSL=false";
20 
21     public static void dbpoolInit() {
22         ds = new BasicDataSource();
23         ds.setUrl(DB_URL);
24         ds.setDriverClassName(DRIVER_NAME);
25         ds.setUsername(USER_NAME);
26         ds.setPassword(PASSWORD);
27     }
28 
29     public static void dbPoolTest() {
30         Connection conn = null;
31         Statement stmt = null;
32         ResultSet rs = null;
33         try {
34             conn = ds.getConnection();
35             stmt = conn.createStatement();
36             rs = stmt.executeQuery("select * from students");
37             while (rs.next()) {
38                 System.out.println(rs.getString("name"));
39             }
40         } catch (SQLException e) {
41             e.printStackTrace();
42         } finally {
43             try {
44                 if (conn != null)
45                     conn.close();
46                 if (stmt != null)
47                     stmt.close();
48                 if (rs != null)
49                     rs.close();
50             } catch (SQLException e1) {
51                 // 忽略
52             }
53 
54         }
55     }
56 
57     public static void main(String[] args) {
58         DBPoolTest.dbpoolInit();
59         DBPoolTest.dbPoolTest();
60     }
61 
62 }