@Before这个注解，让你不用次次写重复的代码

    1. import org.apache.ibatis.io.Resources;
    2. import org.apache.ibatis.session.SqlSession;
    3. import org.apache.ibatis.session.SqlSessionFactory;
    4. import org.apache.ibatis.session.SqlSessionFactoryBuilder;
    5. import org.junit.Before;
    6. import org.junit.Test;
    7. import org.pojo.Student;
    9. import java.io.IOException;
    10. import java.io.InputStream;
    11. import java.util.List;
    13. public class AppTest01 {
    14.     SqlSession sqlSession = null;
    15.     @Before //在所有的@Test方法执行之前先执行前先执行的代码
    16.     public void openSqlSession() throws IOException {
    17.         InputStream in = Resources.getResourceAsStream("mybatis.xml");
    18.         SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
    19.         sqlSession = factory.openSession();
    20.     }
    22.     @Test
    23.     public void testSelectAll(){
    24.         List<Student> list = sqlSession.selectList("zar.getAll");
    25.         list.forEach(student -> System.out.println(student));
    26.         sqlSession.close();
    28.     }
    29. }

    @After也是做同样的事情，与@Before相比是@After做的是最后每次要执行的重复语句,比如sqlSession.close();

    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 org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.pojo.Student;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class AppTest01 {
    SqlSession sqlSession = null;
    @Before //在所有的@Test方法执行之前先执行前先执行的代码
    public void openSqlSession() throws IOException {
        InputStream in = Resources.getResourceAsStream("mybatis.xml");
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        sqlSession = factory.openSession();
    }

    @Test
    public void testSelectAll(){
        List<Student> list = sqlSession.selectList("zar.getAll");
        list.forEach(student -> System.out.println(student));
    }

    @After
    public void closeSqlSession(){
        sqlSession.close();
    }
}