高并发秒杀系统--junit测试类与SpringIoc容器的整合

1.原理是在Junit启动时加载SpringIoC容器

2.SpringIoC容器要根据Spring的配置文件加载

[示例代码]

package org.azcode.dao;

import org.azcode.entity.Seckill;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;

import java.util.Date;

import java.util.List;

import static org.junit.Assert.*;

/**

 * IDEA生成测试类的快捷键 Ctrl+Shift+T

 * 配置Spring和Junit的整合,Junit启动时加载SpringIoC容器

 * Spring-test,junit

 * Created by azcod on 2017/4/14.

 */

@RunWith(SpringJUnit4ClassRunner.class)

//告诉junit Spring配置文件的位置

@ContextConfiguration({"classpath:spring/spring-dao.xml"})

public class SeckillDaoTest {

    //注入Dao实现类

    @Resource

    private SeckillDao seckillDao;

    @Test

    public void queryById() throws Exception {

        long id = 1000;

        Seckill seckill = seckillDao.queryById(id);

        System.out.println(seckill.getName());

        System.out.println(seckill);

        /*

        1000元秒杀iphone7s

        Seckill{seckillId=1000,

                name='1000元秒杀iphone7s',

                number=100,

                startTime=Fri Apr 14 00:00:00 CST 2017,

                endTime=Sat Apr 15 00:00:00 CST 2017,

                createTime=Thu Apr 13 21:14:06 CST 2017}

         */

    }

    @Test

    public void queryAll() throws Exception {

        /**

         * Caused by: org.apache.ibatis.binding.BindingException:

         * Parameter 'offset' not found. Available parameters are [0, 1, param1, param2]

         */

        // java没有保存形参的记录：queryAll(int offset, int limit) -> queryAll(arg1,arg2)

        // 解决方式：通过@Param("paramName")注释告诉mybatis sql中对应的参数是哪一个

        List<Seckill> seckills = seckillDao.queryAll(0,10);

        for(Seckill seckill: seckills){

            System.out.println(seckill);

        }

    }

    @Test

    public void reduceNumber() throws Exception {

        /**

         09:23:58.681 [main] DEBUG o.m.s.t.SpringManagedTransaction -

         JDBC Connection [com.mchange.v2.c3p0.impl.NewProxyConnection@4362d7df]

         will not be managed by Spring

         09:23:58.687 [main] DEBUG o.azcode.dao.SeckillDao.reduceNumber -

         ==>  Preparing: update seckill set number = number -1 where seckill_id = ?

         and start_time <= ? and end_time >= ? and number > 0

         09:23:58.734 [main] DEBUG o.azcode.dao.SeckillDao.reduceNumber -

         ==> Parameters: 1000(Long), 2017-04-14 09:23:58.279(Timestamp),

         2017-04-14 09:23:58.279(Timestamp)

         09:23:58.739 [main] DEBUG o.azcode.dao.SeckillDao.reduceNumber - <==

         Updates: 1

         09:23:58.740 [main] DEBUG org.mybatis.spring.SqlSessionUtils -

         Closing non transactional SqlSession

         [org.apache.ibatis.session.defaults.DefaultSqlSession@f713686]

         */

        Date killTime = new Date();

        int updateCount = seckillDao.reduceNumber(1000L,killTime);

        System.out.println(updateCount);

    }

}