Dbcp最基础的数据源Apache的开源项目，dbcp最后更新停留在2010年，在dbcp基础上衍生出dbcp2截止当前最新更新在2020年。
一：添加依赖
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-dbcp2</artifactId>
<version>${dbcp.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
二：添加配置文件dbcp.properties，所有参数在org.apache.commons.dbcp2.BasicDataSourceFactory工厂类中都有定义
#全部的参数参考,org.apache.commons.dbcp2.BasicDataSourceFactory里的ALL_PROPERTIES driverClassName=com.mysql.cj.jdbc.Driver url=jdbc:mysql://localhost:3306/test username=root password= #<!-- 初始化连接 --> initialSize=10 #最大连接数量 maxActive=50 #<!-- 最大空闲连接 --> maxIdle=20 #<!-- 最小空闲连接 --> minIdle=5 #<!-- 超时等待时间以毫秒为单位 6000毫秒/1000等于60秒 --> maxWait=60000 #JDBC驱动建立连接时附带的连接属性属性的格式必须为这样：[属性名=property;] #注意："user" 与 "password" 两个属性会被明确地传递，因此这里不需要包含他们。 connectionProperties=useUnicode=true;characterEncoding=gbk;serverTimezone=UTC #指定由连接池所创建的连接的自动提交（auto-commit）状态。 defaultAutoCommit=true #driver default 指定由连接池所创建的连接的事务级别（TransactionIsolation）。 #可用值为下列之一：（详情可见javadoc。）NONE,READ_UNCOMMITTED, READ_COMMITTED, REPEATABLE_READ, SERIALIZABLE defaultTransactionIsolation=READ_UNCOMMITTED
三：创建数据源对象
import java.io.FileInputStream; import java.util.Properties; import org.apache.commons.dbcp2.BasicDataSource; import org.apache.commons.dbcp2.BasicDataSourceFactory; /*** * * @author zhanchaohan * */ public class DbcpUtill { public BasicDataSource initBasicDataSource() throws Exception { Properties properties = new Properties(); properties.load(new FileInputStream(DbcpUtill.class.getResource("/dbcp.properties").getPath())); // BasicDataSourceFactory bsf = new BasicDataSourceFactory();// 创建工厂 return BasicDataSourceFactory.createDataSource(properties);// 获取数据源 } }
四：官方给出了三个实例
4.1:BasicDataSourceExample.java
package com.jachs.dbcp.apache; /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import javax.sql.DataSource; // // Here are the dbcp-specific classes. // Note that they are only used in the setupDataSource // method. In normal use, your classes interact // only with the standard JDBC API // import org.apache.commons.dbcp2.BasicDataSource; // // Here's a simple example of how to use the BasicDataSource. // // // Note that this example is very similar to the PoolingDriver // example. // // To compile this example, you'll want: // * commons-pool-2.3.jar // * commons-dbcp-2.1.jar // in your classpath. // // To run this example, you'll want: // * commons-pool-2.3.jar // * commons-dbcp-2.1.jar // * commons-logging-1.2.jar // in your classpath. // // // Invoke the class using two arguments: // * the connect string for your underlying JDBC driver // * the query you'd like to execute // You'll also want to ensure your underlying JDBC driver // is registered. You can use the "jdbc.drivers" // property to do this. // // For example: // java -Djdbc.drivers=org.h2.Driver // -classpath commons-pool2-2.3.jar:commons-dbcp2-2.1.jar:commons-logging-1.2.jar:h2-1.3.152.jar:. // BasicDataSourceExample // "jdbc:h2:~/test" // "SELECT 1" // public class BasicDataSourceExample { public static void main(String[] args) { // First we set up the BasicDataSource. // Normally this would be handled auto-magically by // an external configuration, but in this example we'll // do it manually. // System.out.println("Setting up data source."); DataSource dataSource = setupDataSource(args[0]); System.out.println("Done."); // // Now, we can use JDBC DataSource as we normally would. // Connection conn = null; Statement stmt = null; ResultSet rset = null; try { System.out.println("Creating connection."); conn = dataSource.getConnection(); System.out.println("Creating statement."); stmt = conn.createStatement(); System.out.println("Executing statement."); rset = stmt.executeQuery(args[1]); System.out.println("Results:"); int numcols = rset.getMetaData().getColumnCount(); while(rset.next()) { for(int i=1;i<=numcols;i++) { System.out.print(" " + rset.getString(i)); } System.out.println(""); } } catch(SQLException e) { e.printStackTrace(); } finally { try { if (rset != null) rset.close(); } catch(Exception e) { } try { if (stmt != null) stmt.close(); } catch(Exception e) { } try { if (conn != null) conn.close(); } catch(Exception e) { } } } public static DataSource setupDataSource(String connectURI) { BasicDataSource ds = new BasicDataSource(); ds.setDriverClassName("org.h2.Driver"); ds.setUrl(connectURI); return ds; } public static void printDataSourceStats(DataSource ds) { BasicDataSource bds = (BasicDataSource) ds; System.out.println("NumActive: " + bds.getNumActive()); System.out.println("NumIdle: " + bds.getNumIdle()); } public static void shutdownDataSource(DataSource ds) throws SQLException { BasicDataSource bds = (BasicDataSource) ds; bds.close(); } }
4.2:PoolingDataSourceExample.java
package com.jachs.dbcp.apache; /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import javax.sql.DataSource; import java.sql.Connection; import java.sql.Statement; import java.sql.ResultSet; import java.sql.SQLException; // // Here are the dbcp-specific classes. // Note that they are only used in the setupDataSource // method. In normal use, your classes interact // only with the standard JDBC API // import org.apache.commons.pool2.ObjectPool; import org.apache.commons.pool2.impl.GenericObjectPool; import org.apache.commons.dbcp2.ConnectionFactory; import org.apache.commons.dbcp2.PoolableConnection; import org.apache.commons.dbcp2.PoolingDataSource; import org.apache.commons.dbcp2.PoolableConnectionFactory; import org.apache.commons.dbcp2.DriverManagerConnectionFactory; // // Here's a simple example of how to use the PoolingDataSource. // // // Note that this example is very similar to the PoolingDriver // example. In fact, you could use the same pool in both a // PoolingDriver and a PoolingDataSource // // // To compile this example, you'll want: // * commons-pool2-2.3.jar // * commons-dbcp2-2.1.jar // in your classpath. // // To run this example, you'll want: // * commons-pool2-2.3.jar // * commons-dbcp2-2.1.jar // * commons-logging-1.2.jar // * the classes for your (underlying) JDBC driver // in your classpath. // // Invoke the class using two arguments: // * the connect string for your underlying JDBC driver // * the query you'd like to execute // You'll also want to ensure your underlying JDBC driver // is registered. You can use the "jdbc.drivers" // property to do this. // // For example: // java -Djdbc.drivers=org.h2.Driver // -classpath commons-pool2-2.3.jar:commons-dbcp2-2.1.jar:commons-logging-1.2.jar:h2-1.3.152.jar:. // PoolingDataSourceExample // "jdbc:h2:~/test" // "SELECT 1" // public class PoolingDataSourceExample { public static void main(String[] args) { // // First we load the underlying JDBC driver. // You need this if you don't use the jdbc.drivers // system property. // System.out.println("Loading underlying JDBC driver."); try { Class.forName("org.h2.Driver"); } catch (ClassNotFoundException e) { e.printStackTrace(); } System.out.println("Done."); // // Then, we set up the PoolingDataSource. // Normally this would be handled auto-magically by // an external configuration, but in this example we'll // do it manually. // System.out.println("Setting up data source."); DataSource dataSource = setupDataSource(args[0]); System.out.println("Done."); // // Now, we can use JDBC DataSource as we normally would. // Connection conn = null; Statement stmt = null; ResultSet rset = null; try { System.out.println("Creating connection."); conn = dataSource.getConnection(); System.out.println("Creating statement."); stmt = conn.createStatement(); System.out.println("Executing statement."); rset = stmt.executeQuery(args[1]); System.out.println("Results:"); int numcols = rset.getMetaData().getColumnCount(); while(rset.next()) { for(int i=1;i<=numcols;i++) { System.out.print(" " + rset.getString(i)); } System.out.println(""); } } catch(SQLException e) { e.printStackTrace(); } finally { try { if (rset != null) rset.close(); } catch(Exception e) { } try { if (stmt != null) stmt.close(); } catch(Exception e) { } try { if (conn != null) conn.close(); } catch(Exception e) { } } } public static DataSource setupDataSource(String connectURI) { // // First, we'll create a ConnectionFactory that the // pool will use to create Connections. // We'll use the DriverManagerConnectionFactory, // using the connect string passed in the command line // arguments. // ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(connectURI,null); // // Next we'll create the PoolableConnectionFactory, which wraps // the "real" Connections created by the ConnectionFactory with // the classes that implement the pooling functionality. // PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory(connectionFactory, null); // // Now we'll need a ObjectPool that serves as the // actual pool of connections. // // We'll use a GenericObjectPool instance, although // any ObjectPool implementation will suffice. // ObjectPool<PoolableConnection> connectionPool = new GenericObjectPool<>(poolableConnectionFactory); // Set the factory's pool property to the owning pool poolableConnectionFactory.setPool(connectionPool); // // Finally, we create the PoolingDriver itself, // passing in the object pool we created. // PoolingDataSource<PoolableConnection> dataSource = new PoolingDataSource<>(connectionPool); return dataSource; } }
4.3:PoolingDriverExample.java
package com.jachs.dbcp.apache; /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import org.apache.commons.dbcp2.ConnectionFactory; import org.apache.commons.dbcp2.DriverManagerConnectionFactory; import org.apache.commons.dbcp2.PoolableConnection; import org.apache.commons.dbcp2.PoolableConnectionFactory; import org.apache.commons.dbcp2.PoolingDriver; // // Here are the dbcp-specific classes. // Note that they are only used in the setupDriver // method. In normal use, your classes interact // only with the standard JDBC API // import org.apache.commons.pool2.ObjectPool; import org.apache.commons.pool2.impl.GenericObjectPool; // // Here's a simple example of how to use the PoolingDriver. // // To compile this example, you'll want: // * commons-pool-2.3.jar // * commons-dbcp-2.1.jar // in your classpath. // // To run this example, you'll want: // * commons-pool-2.3.jar // * commons-dbcp-2.1.jar // * commons-logging-1.2.jar // in your classpath. // // Invoke the class using two arguments: // * the connect string for your underlying JDBC driver // * the query you'd like to execute // You'll also want to ensure your underlying JDBC driver // is registered. You can use the "jdbc.drivers" // property to do this. // // For example: // java -Djdbc.drivers=org.h2.Driver // -classpath commons-pool2-2.3.jar:commons-dbcp2-2.1.jar:commons-logging-1.2.jar:h2-1.3.152.jar:. // PoolingDriverExample // "jdbc:h2:~/test" // "SELECT 1" // public class PoolingDriverExample { public static void main(String[] args) { // // First we load the underlying JDBC driver. // You need this if you don't use the jdbc.drivers // system property. // System.out.println("Loading underlying JDBC driver."); try { Class.forName("org.h2.Driver"); } catch (ClassNotFoundException e) { e.printStackTrace(); } System.out.println("Done."); // // Then we set up and register the PoolingDriver. // Normally this would be handled auto-magically by // an external configuration, but in this example we'll // do it manually. // System.out.println("Setting up driver."); try { setupDriver(args[0]); } catch (Exception e) { e.printStackTrace(); } System.out.println("Done."); // // Now, we can use JDBC as we normally would. // Using the connect string // jdbc:apache:commons:dbcp:example // The general form being: // jdbc:apache:commons:dbcp:<name-of-pool> // Connection conn = null; Statement stmt = null; ResultSet rset = null; try { System.out.println("Creating connection."); conn = DriverManager.getConnection("jdbc:apache:commons:dbcp:example"); System.out.println("Creating statement."); stmt = conn.createStatement(); System.out.println("Executing statement."); rset = stmt.executeQuery(args[1]); System.out.println("Results:"); int numcols = rset.getMetaData().getColumnCount(); while(rset.next()) { for(int i=1;i<=numcols;i++) { System.out.print(" " + rset.getString(i)); } System.out.println(""); } } catch(SQLException e) { e.printStackTrace(); } finally { try { if (rset != null) rset.close(); } catch(Exception e) { } try { if (stmt != null) stmt.close(); } catch(Exception e) { } try { if (conn != null) conn.close(); } catch(Exception e) { } } // Display some pool statistics try { printDriverStats(); } catch (Exception e) { e.printStackTrace(); } // closes the pool try { shutdownDriver(); } catch (Exception e) { e.printStackTrace(); } } public static void setupDriver(String connectURI) throws Exception { // // First, we'll create a ConnectionFactory that the // pool will use to create Connections. // We'll use the DriverManagerConnectionFactory, // using the connect string passed in the command line // arguments. // ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(connectURI,null); // // Next, we'll create the PoolableConnectionFactory, which wraps // the "real" Connections created by the ConnectionFactory with // the classes that implement the pooling functionality. // PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory(connectionFactory, null); // // Now we'll need a ObjectPool that serves as the // actual pool of connections. // // We'll use a GenericObjectPool instance, although // any ObjectPool implementation will suffice. // ObjectPool<PoolableConnection> connectionPool = new GenericObjectPool<>(poolableConnectionFactory); // Set the factory's pool property to the owning pool poolableConnectionFactory.setPool(connectionPool); // // Finally, we create the PoolingDriver itself... // Class.forName("org.apache.commons.dbcp2.PoolingDriver"); PoolingDriver driver = (PoolingDriver) DriverManager.getDriver("jdbc:apache:commons:dbcp:"); // // ...and register our pool with it. // driver.registerPool("example",connectionPool); // // Now we can just use the connect string "jdbc:apache:commons:dbcp:example" // to access our pool of Connections. // } public static void printDriverStats() throws Exception { PoolingDriver driver = (PoolingDriver) DriverManager.getDriver("jdbc:apache:commons:dbcp:"); ObjectPool<? extends Connection> connectionPool = driver.getConnectionPool("example"); System.out.println("NumActive: " + connectionPool.getNumActive()); System.out.println("NumIdle: " + connectionPool.getNumIdle()); } public static void shutdownDriver() throws Exception { PoolingDriver driver = (PoolingDriver) DriverManager.getDriver("jdbc:apache:commons:dbcp:"); driver.closePool("example"); } }