JDBC从连接池获取连接（Druid连接池）

package com.gotion.dataextract.utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;
import com.gotion.common.core.constant.Constants;
import com.gotion.common.core.constant.ServiceNameConstants;
import com.gotion.common.core.exception.BaseException;

import javax.sql.DataSource;
import java.sql.*;
import java.util.Properties;

/**
 * 数据库链接工具类
 *
 * @author fangzp
 * @date 2022-06-16
 */
public class JdbcUtil {

    /**
     * 从druid数据库连接池获取数据库连接
     *
     * @param driver   数据库驱动
     * @param url      数据库连接串
     * @param username 用户名
     * @param password 密码
     * @return 连接
     */
    public static Connection druidDataSource(String driver, String url, String username, String password) {
        try {
            Properties properties = new Properties();
            properties.setProperty("driverClassName", driver);
            properties.setProperty("url", url);
            properties.setProperty("username", username);
            properties.setProperty("password", password);
            properties.setProperty("initialSize", "10");
            properties.setProperty("maxActive", "20");
            DataSource dataSource = DruidDataSourceFactory.createDataSource(properties);
            return dataSource.getConnection();
        } catch (Exception e) {
            throw new BaseException(ServiceNameConstants.DATA_SERVICE, Constants.ERROR, null, "获取数据库连接错误");
        }
    }

    /**
     * 释放连接资源
     *
     * @param conn 连接
     * @param ps   预处理对象
     * @param rs   结果集
     */
    public static void closeAll(Connection conn, PreparedStatement ps, ResultSet rs) {
        try {
            if (rs != null) {
                rs.close();
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                if (ps != null) {
                    ps.close();
                }
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally {
                try {
                    if (conn != null) {
                        conn.close();
                    }
                } catch (Exception e2) {
                    // TODO: handle exception
                }
            }
        }
    }
}