javaweb中连接池技术

1.导入mysql-connector-java-8.0.15.jar
commons-dbcp-1.4.jar
commons-pool-1.5.6.jar

2.配置dbcp.properties

driverClassName=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/bookshop?useSSL=false&serverTimezone=UTC
username=root
password=123456
initialSize=10
maxActive=20
maxWait=10000

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
import javax.sql.DataSource;
import org.apache.commons.dbcp.BasicDataSourceFactory;
public class JDBCPoolUtil1 {
 private static DataSource dataSource;
 static {
  Properties p = new Properties();
  InputStream in = 
    JDBCPoolUtil1.class.getClassLoader().getResourceAsStream("dbcp.properties");
  try {
   p.load(in);
   dataSource = BasicDataSourceFactory.createDataSource(p);
  } catch (IOException e) {
   e.printStackTrace();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 public static Connection getConnection() {
  Connection conn=null;
  try {
   conn = dataSource.getConnection();
  } catch (SQLException e) {
   e.printStackTrace();
  }
  return conn;
 }
}