為減小系統對資料庫的獲取連線和關閉連線的開銷，連線池便是一個不錯的選擇

• 將DataSource封裝成一個工具類，使用時呼叫即可

package com.kong.JDBCUtils;

import org.apache.commons.dbcp.BasicDataSource;

import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * 使用了properties+連線池；
 * 推薦使用此類獲取dataSource方法
 */
public class JDBCUtils {
    private static BasicDataSource basicDataSource = new BasicDataSource();
    private static String driverName;
    private static String url;
    private static String username;
    private static String password;
    static{
        InputStream inputStream = JDBCUtils.class.getClassLoader().getResourceAsStream("database.properties");
        Properties properties = new Properties();
        try {
            properties.load(inputStream);
        } catch (IOException e) {
            throw new RuntimeException(e+"讀取配置檔案失敗");
        }
        driverName = properties.getProperty("driver");
        url = properties.getProperty("url");
        username = properties.getProperty("name");
        password = properties.getProperty("password");
        //設定DataSource基本資訊
        basicDataSource.setDriverClassName(driverName);
        basicDataSource.setUrl(url);
        basicDataSource.setUsername(username);
        basicDataSource.setPassword(password);
        //設定DataSource其他連線資訊
        basicDataSource.setInitialSize(10);//初始化的連線數
        basicDataSource.setMaxActive(8);//最大的連線數
        basicDataSource.setMaxIdle(5);//最大空閒數
        basicDataSource.setMinIdle(1);//最小空閒數
    }

    public static DataSource getbasicDataSource(){
        return basicDataSource;
    }
}

• 呼叫

public class DBUtilsLinkDemo {
    public static void main(String[] args) throws IOException {

        try {
            Connection connection = JDBCUtils.getbasicDataSource().getConnection();
            System.out.println(connection);
        } catch (SQLException e) {
            throw new RuntimeException(e+"database connect fail");
        }


    }

}

• 結果

^_^