需要用到的jar包，commons-dbcp2-*.jar、commons-logging-*.jar、commons-pool2-*.jar，*代表版本號

DataSourceTest類

package com.edu.zzu.Util;

import org.apache.commons.dbcp2.BasicDataSourceFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.sql.DataSource;
import
 
 java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

public class DataSourceTest {
    private static final Log log = LogFactory.getLog(DataSourceTest.class);
    private static final String configFile = "dbcp.properties";

    private static DataSource dataSource;

    static
 
 {
        Properties properties = new Properties();
        try {
            properties.load(DataSourceTest.class.getClassLoader().getResourceAsStream(configFile));
            dataSource = BasicDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
           log.error("初始化連線池失敗："
 
+e);
        }
    }

    public static Connection getConnection() {
        try {
            return dataSource.getConnection();
        } catch (SQLException e) {
            log.error("獲取資料庫連線失敗："+e);
        }
        return null;
    }

    public static void close(Connection conn) {
        try{
            if (conn != null || !conn.isClosed()) {
                conn.setAutoCommit(true);
                conn.close();
            }
        } catch (Exception e) {

        }
    }
}

dbcp.properties

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/lecture
username=root
password=123456
initialSize=10
maxActive=50
maxIdle=10
maxWait=10

DruidPool

package com.edu.zzu.Util;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

public class DruidPool {
    private static DataSource dataSource;
    static {
        Properties prop = new Properties();
        try {
            prop.load(DataBaseConnection.class.getClassLoader().getResourceAsStream("dbcp.properties"));
        } catch (IOException e) {
            System.out.println("資料庫配置檔案丟失");
            e.printStackTrace();
        }
        try {
            dataSource = DruidDataSourceFactory.createDataSource(prop);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static Connection getConnection() {
        try {
            return dataSource.getConnection();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
}