将sqlsessionfactory放到工具类

public class SqlSessionFac {
    private static SqlSessionFactory sqlSessionFactory;
    private SqlSessionFac() {
    }
    public static SqlSessionFactory getSSF(){
        InputStream inputStream= null;
        try {
            inputStream = Resources.getResourceAsStream("mybatis-config.xml");
        } catch (IOException e) {
            e.printStackTrace();
        }
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        return sqlSessionFactory;
    }
}