4. 构造MyBatis工具类

package com.liangwei.utils;
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;
/**
 * @author liangwei
 */
public class MyBatisUtils {
    private static SqlSessionFactory sqlSessionFactory = null;
    static {
        String config = "mybatis.xml";
        try {
            InputStream inputStream = Resources.getResourceAsStream(config);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            sqlSessionFactory = null;
            e.printStackTrace();
        }
    }
    /**
     *  获取sqlSession对象
     * @return SqlSession
     */
    public static SqlSession getSqlSession() {
        SqlSession sqlSession = null;
        if(sqlSessionFactory != null) {
            // 非自动提交事务
            sqlSession = sqlSessionFactory.openSession();
        }
        return sqlSession;
    }
}