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);
    }

}