//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 }
时间: 2024-10-13 02:41:42