mybatis测试时空指针异常

 public class UserDaoImplTest {
    private SqlSessionFactory sqlSessionFactory;
    @Before
    public void setUp() throws Exception{
        String resource = "SqlMapConfig.xml";
        InputStream inputStream = org.apache.ibatis.io.Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    }
    @Test
    //测试方法
    public void testFindUserById() throws Exception {
        UserDao userDao = new UserDaoImpl(sqlSessionFactory);
        User user = userDao.findUserById(1);//错误在这
        System.out.println(user);
    }
}

public class UserDaoImpl implements UserDao{
private SqlSessionFactory sqlSessionFactory;
public UserDaoImpl(SqlSessionFactory sqlSessionFactory) {
this.sqlSessionFactory = sqlSessionFactory;
}
@Override
public User findUserById(int id) throws Exception {
SqlSession sqlSession = sqlSessionFactory.openSession();
User user = sqlSession.selectOne("test.findUserById",1);
sqlSession.close();
return user;
}

新手求指点下怎么解决。。

SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); 你定义的全局sqlSessionFactory有什么用

sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
就行了