JUnit 的使用
- 添加依赖
新建一个maven项目,然后添加依赖:
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<!-- 告诉该类库用于测试阶段 -->
<scope>test</scope>
</dependency>
- 接口
1 package cn.edu.xcu.reflect.dao; 2 public interface BookDao { 3 public void insert(); 4 public void update(); 5 public void del(); 6 }
- 实现类
import org.junit.Test;
import cn.edu.xcu.reflect.dao.BookDao; //这么做存在代码重复 public class BookDaoImpl implements BookDao { @Test//告诉 Junit 该方法要运行 @Override public void insert() { try { System.out.println("开启会话"); //// System.out.println("插入书籍"); /// System.out.println("事务提交"); } catch (Exception e) { System.out.println("事务回滚"); e.printStackTrace(); } finally { System.out.println("关闭会话"); } }
- 测试
- 定义注解
@Retention(RetentionPolicy.RUNTIME) // 因为通过反射读取 @Target({ ElementType.METHOD }) // 测试方法 public @interface Test { }
- 在被测试类上添加注解
//这么做存在代码重复 public class BookDaoImpl implements BookDao { @Test @Override public void insert() { try { System.out.println("开启会话"); //// System.out.println("插入书籍"); /// System.out.println("事务提交"); } catch (Exception e) { System.out.println("事务回滚"); e.printStackTrace(); } finally { System.out.println("关闭会话"); } } @Override public void update() { try { System.out.println("开启会话"); //// System.out.println("修改书籍"); /// System.out.println("事务提交"); } catch (Exception e) { System.out.println("事务回滚"); e.printStackTrace(); } finally { System.out.println("关闭会话"); } }
- 编写测试类工具
public class TestTool { public static void main(String[] args) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException { startTest(BookDaoImpl.class); }
public static void startTest(Class clazz)throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException { // 1 告诉测试那个类 Object obj = clazz.newInstance(); // 2 判断该类的方法是否有我们自定义的注解,如果有就调用该方法 Method[] ms = clazz.getDeclaredMethods(); for (Method method : ms) { if (method.isAnnotationPresent(Test.class)) { method.invoke(obj); } } } }