JavaWeb--SqlSessionFactory工具类抽取

代码优化

String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//2.2获取SqlSession对象
SqlSession sqlSession = sqlSessionFactory.openSession();

package com.avb.util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
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自动执行，且只执行一次

        SqlSessionFactory sqlSessionFactory = null;
        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;
    }
}