spring.datasource.druid.break-after-acquire-failure=true
spring.datasource.druid.connection-error-retry-attempts=3

#這個(gè)是mysql5.5版本的配置文件
username=用戶名
password=密碼
#url 注意這個(gè)book 表示你要連接的數(shù)據(jù)庫
url=jdbc:mysql://localhost:3306/book
driverClassName=com.mysql.jdbc.Driver
initialSize=5
maxActive=5

#這個(gè)是mysql更高版本的配置文件
username=用戶名
password=密碼
#url 注意這個(gè)book表示你要連接的數(shù)據(jù)庫
url=jdbc:mysql://localhost:3306/book?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&autoReconnect=true&useSSL=false
driverClassName=com.mysql.cj.jdbc.Driver
initialSize=5
maxActive=5

public class JavaUtils {   //實(shí)現(xiàn)數(shù)據(jù)庫連接和關(guān)閉的封裝 體會Java編程的思想
    private static DruidDataSource dataSource;

    static {

        try {
            // 讀取jdbc.properties屬性的配置文件
            Properties properties = new Properties();
            //從流中加載數(shù)據(jù)
            InputStream inputStream = JavaUtils.class.getClassLoader().getResourceAsStream("jdbc.properties");

            properties.load(inputStream);

            dataSource = (DruidDataSource) DruidDataSourceFactory.createDataSource(properties);
            System.out.println(dataSource.getConnection());

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {

    }
  /*  關(guān)閉連接 放回?cái)?shù)據(jù)庫連接池*/
    public static void closeSources(PreparedStatement ps, Connection con) {
        try {
            if (ps != null)
                ps.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        try {
            if (con != null)
                con.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}