连接池之DruidUtil

package dbcp;  import java.sql.Connection; import java.sql.ResultSet; import java.sql.Statement; import java.util.Properties;  import javax.sql.DataSource;  import com.alibaba.druid.pool.DruidDataSourceFactory;   public class DruidUtil {  	private static DataSource ds = null; 	static { 		try { 			Properties p = new Properties(); 			p.load(Thread.currentThread().getContextClassLoader() 					.getResourceAsStream("druid.properties")); 			// 创建DataSource对象 			ds = DruidDataSourceFactory.createDataSource(p); 			 		} catch (Exception e) { 			e.printStackTrace(); 		} 	} 	 	public static Connection getConn() { 		try { 			return ds.getConnection(); 		} catch (Exception e) { 			e.printStackTrace(); 		} 		return null; 	} 	 	public static void close(Connection conn, Statement st, ResultSet rs) { 		try { 			if(rs != null) { 				rs.close(); 			} 		} catch (Exception e) { 		} finally { 			try { 				if(st != null) { 					st.close(); 				} 			} catch (Exception e2) { 			} finally { 				try { 					if(conn != null) { 						conn.close(); 					} 				} catch (Exception e3) { 				} 			} 		} 	} } 

　　

测试:

package dbcp;  import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet;  import javax.sql.DataSource;  import org.apache.commons.dbcp.BasicDataSource; import org.junit.Test;  // 使用DBCP连接池 public class DBCPTest { 	 	public DataSource getDataSource() { 		// 创建连接对象 		BasicDataSource ds = new BasicDataSource(); 		// 设置连接数据库的四要素 		ds.setDriverClassName("com.mysql.cj.jdbc.Driver"); 		ds.setUrl("jdbc:mysql://localhost:3306/jdbcdemo?useUnicode=true&characterEncoding=utf-8&useSSL=false&&serverTimezone=GMT"); 		ds.setUsername("root"); 		ds.setPassword("admin"); 		ds.setMaxActive(5);		// 最大连接数 		return ds; 	}  	@Test 	public void test1() throws Exception { 		//DataSource ds = this.getDataSource(); 		//Connection conn = ds.getConnection(); 		Connection conn = DruidUtil.getConn(); 		PreparedStatement ps = conn.prepareStatement("SELECT * FROM t_student"); 		ResultSet rs = ps.executeQuery(); 		while(rs.next()) { 			System.out.println(rs.getLong("id")); 		} 	} } 

　　

配置文件

driverClassName=com.mysql.cj.jdbc.Driver url=jdbc:mysql://localhost:3306/jdbcdemo?useUnicode=true&characterEncoding=utf-8&useSSL=false&&serverTimezone=GMT username=root password=admin maxActive=10  validationQuery:SELECT 1 testWhileIdle:true testOnBorrow:false testOnReturn:false