关于util代码

package com.cwk.util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class SqlSessionFactoryUtils {

private static SqlSessionFactory sqlSessionFactory;

static {
    //静态代码块会随着类的加载而自动执行，且只执行一次
    try {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    } catch (IOException e) {
        e.printStackTrace();
    }
}


public static SqlSessionFactory getSqlSessionFactory(){
    return sqlSessionFactory;
}

}