一、基本构造

1、在文件目录下创建一个maven项目

mvn archetype:generate -DgroupId=org.seckill -DartifactId=seckill -DarchetypeArtifactId=maven-archetype-webapp -DarchetypeCatalog=local

2、用idea导入这个maven.xml项目

3、修改web.xml文件-------将2.3修改为3.0，因为，高版本的Servlet支持更多的特性,更方便我们的Coding,特别是支持注解这一特性

这个修改的内容可以到tomcat目录下去找

C:\软件\apache-tomcat-8.0.47\webapps\examples\WEB-INF\web.xml

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0"
         metadata-complete="true">
    <!--用maven创建的web-app需要修改servlet的版本为3.0-->

4、创建项目目录结构

image.png

5、修改maven.xml文件，导入工程所需的jar包（junit需要最新的）

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.seckill</groupId>
  <artifactId>seckill</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>seckill Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <!-- https://mvnrepository.com/artifact/junit/junit -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <!-- 补全项目依赖 -->
    <!-- 1、日志 java日志：slf4j，log4j,logback,common-logging slf4j是规范/接口 日志实现：log4j,lonback,common-logging
        使用slf4j,logback -->
    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.25</version>
    </dependency>

    <!-- 整合slf4j接口以及实现 -->
    <!-- https://mvnrepository.com/artifact/ch.qos.logback/logback-classic -->
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>1.1.7</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/ch.qos.logback/logback-core -->
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-core</artifactId>
      <version>1.1.7</version>
    </dependency>


    <!-- 2、数据库相关 -->
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>6.0.6</version>
      <scope>runtime</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
    <dependency>
      <groupId>com.mchange</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.5.2</version>
    </dependency>

    <!-- 3、dao层框架依赖 -->
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.5</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.1</version>
    </dependency>

    <!-- 3 、servlet web相关 -->
    <!-- https://mvnrepository.com/artifact/taglibs/standard -->
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>


    <!--4、spring 依赖 -->
    <!-- 4.1、spring core核心依赖 -->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.3.12.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.3.12.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.12.RELEASE</version>
    </dependency>

    <!-- 4.2 spring dao层依赖 -->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>4.3.12.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>4.3.12.RELEASE</version>
    </dependency>

    <!-- 4.3 spring web相关依赖 -->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.12.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.3.12.RELEASE</version>
    </dependency>

    <!-- 4.4 spring test相关依赖 -->

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>4.3.12.RELEASE</version>
      <scope>test</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>4.3.12.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>2.9.0</version>
    </dependency>

    <dependency>
      <groupId>com.dyuproject.protostuff</groupId>
      <artifactId>protostuff-runtime</artifactId>
      <version>1.1.1</version>
    </dependency>
    <dependency>
      <groupId>com.dyuproject.protostuff</groupId>
      <artifactId>protostuff-core</artifactId>
      <version>1.1.3</version>
    </dependency>

    <!--导入apache工具-->
    <dependency>
      <groupId>commons-collections</groupId>
      <artifactId>commons-collections</artifactId>
      <version>3.2.2</version>
    </dependency>


  </dependencies>
  <build>
    <finalName>seckill</finalName>
      <plugins>
          <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-compiler-plugin</artifactId>
              <configuration>
                  <source>1.8</source>
                  <target>1.8</target>
              </configuration>
          </plugin>
      </plugins>
  </build>
</project>

6、创建实体包 Seckill SuccessKilled

Seckill (省略Set Get toString)

package com.seckill.entity;
public class Seckill {

    private long seckillId;
    private String name;
    private int number;
    private Date startTime;
    private Date endTime;
    private Date createTime;

}

SuccessKilled

public class SuccessKilled {
    public SuccessKilled() {
        // Auto-generated constructor stub
    }

    private long seckillId;//秒杀商品ID
    private long userPhone;//参与秒杀的用户手机号码
    private short state;//秒杀的状态
    private Date createTime;//秒杀的时间

    //多对一
    private Seckill seckill;
}

7、编写dao层接口 SeckillDao 、SuccessKilledDao,相对应与mybatis

seckillDao：商品信息的数据操作
~、在执行秒杀操作中，前台显示商品列表，所以需要能够根据偏移量查询商品列表的数据操作：queryAll(offset,limit);
~、当点击商品详情时，需要根据此商品id进行操作，需要：queryById(seckilllID);
~、当秒杀成功后，需要对商品数据进行操作，即减少商品数量，需要:reduceNumber(seckillId,killTime)(此处的参数应该根据数据库表的字段来进行操作);
~、在分页操作中需要获取数据的总数，需要querySeckillNumber()

public interface SeckillDao {
    
    /**
     * 减库存，秒杀成功后库存数量减少？
     * @param seckillId
     * @param killTime
     * @return 如果影响行数>1，表示更新的记录行数
     */
    int reduceNumber(@Param("seckillId")long seckillId, @Param("killTime")Date killTime);

    /**
     * 根据id查询
     * @param seckillId
     * @return
     */
    Seckill queryById(long seckillId);

    /**
     * 根据偏移量查询秒杀商品列表
     * @param offset
     * @param limit
     * @return
     */
    List<Seckill> queryAll(@Param("offset")int offset, @Param("limit")int limit);

    /**
     * 获取商品的种类数量
     * @return 秒杀商品的种类
     */
    int querySeckillNumber();

    /**
     * 使用存储过程执行秒杀
     * @param paramMap
     */
    void killByProcedure(Map<String, Object> paramMap);

}

SuccessKilledDao：秒杀信息表的数据操作
~、秒杀后需要秒杀用户的一系列信息，因此需要:insertSuccessKilled(seckillId,userPhone)
~、当用户秒杀成功前需要进行一系列判断（是否已经秒杀过），因此需要根据用户手机和商品id进行查询：queryByIdWithSeckill(seckillId,userPhone)

public interface SuccessKilledDao {

    /**
     * 插入一条详细的购买信息
     * @param seckillId
     * @param userPhone
     * @return 成功插入返回1，否则返回0
     */
    int insertSuccessKilled(@Param("seckillId")long seckillId, @Param("userPhone")long userPhone);

    /**
     * 根据秒杀商品的id查询，明细信息
     * @param seckillId
     * @param uerPhone
     * @return 秒杀商品的明细信息
     */
    SuccessKilled queryByIdWithSeckill(@Param("seckillId")long seckillId, @Param("userPhone")long uerPhone);
}

8、Mybatis的mapper映射配置文件-----SeckillDao.xml和SuccessKilledDao.xml

SeckillDao.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.seckill.dao.SeckillDao">
    <!--这里的<=需要使用进行忽略,所以是要进行忽略,使用CDATA 区段中的文本会被解析器忽略 -->
    <update id="reduceNumber">
        UPDATE seckill
        SET number = number - 1
        WHERE seckill_id = #{seckillId}
        AND start_time
        <![CDATA[
              <=
              ]]>
        #{killTime}
        AND end_time >= #{killTime}
        AND number > 0
    </update>

    <select id="queryById" resultType="com.seckill.entity.Seckill" parameterType="long">
        SELECT * FROM
        seckill AS s
        WHERE s.seckill_id = #{seckillId}
    </select>

    <select id="queryAll" resultType="com.seckill.entity.Seckill">
        SELECT * FROM seckill as s
        ORDER BY create_time
        LIMIT #{offset}, #{limit}
    </select>

    <select id="querySeckillNumber" resultType="int">
        SELECT count(*) FROM seckill
    </select>
    <!--调用存储过程-->
    <select id="killByProcedure" statementType="CALLABLE">
        CALL execute_seckill(
              #{seckillId,jdbcType=BIGINT,mode=IN},
              #{phone,jdbcType=BIGINT,mode=IN},
              #{killTime,jdbcType=TIMESTAMP,mode=IN},
              #{result,jdbcType=INTEGER,mode=OUT}
        )
    </select>
</mapper>

SuccessKilledDao

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.seckill.dao.SuccessKilledDao">

    <!-- ignore 處理主键冲突时候 -->
    <insert id="insertSuccessKilled">
        INSERT IGNORE INTO success_killed (seckill_id,user_phone,state)
        VALUES (#{seckillId}, #{userPhone},0)

    </insert>

    <select id="queryByIdWithSeckill" resultType="com.seckill.entity.SuccessKilled">
        <!-- 根据ID查询seccessKilled并携带seckill实体 -->
        <!-- 如果告诉mybatis把结果映射到successKilled同时映射seckill属性  -->
        <!-- 开启了驼峰命名法转换，以及别名替换列名 -->
        <!-- 可以自由控制sql -->
        SELECT
        sk.seckill_id,
        sk.user_phone,
        sk.create_time,
        sk.state,
        s.seckill_id  "seckill.seckill_id",
        s.name "seckill.name",
        s.number "seckill",
        s.start_time  "seckill.start_time",
        s.end_time  "seckill.end_time",
        s.create_time "seckill.create_time"
        FROM success_killed sk
        INNER JOIN seckill s ON sk.seckill_id = s.seckill_id
        WHERE sk.seckill_id = #{seckillId}
        AND sk.user_phone= #{userPhone}
    </select>
</mapper>

建立mybatis的mybatis-config.xml配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <!--使用jdbc的getGenerateKeys 获取数据库自增主键值  -->
        <setting name="useGeneratedKeys" value="true"/>
        <!-- 使用别名替换列名 ，默认true -->
        <setting name="useColumnLabel" value="true"/>
        <!--使用驼峰命名转换 :Table(create_Time) -> Table(createTime)  -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

整合spring和Mybatis，建立spring的dao层配置文件，在resources下创建seckill-dao.xml
~、操作数据，因此需要数据库相关参数
~、配置数据库连接池
~、配置sqlSessionFactory,进行mybatis和spring的整合
~、配置dao接口类，动态实现mapper接口，注入到spring容器中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <!-- 配置整合mybatis过程 -->
    <!-- 1、配置数据库相关参数 -->
    <context:property-placeholder location="classpath:jdbc.properties" />

    <!-- 2、配置数据库连接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>
        <!--c3p0私有属性-->
        <property name="maxPoolSize" value="50"/>
        <property name="minPoolSize" value="10"/>
        <!--关闭连接后不自动commit-->
        <property name="autoCommitOnClose" value="false"/>
        <!--获取连接超时时间-->
        <!-- <property name="checkoutTimeout" value="1000"/> -->
        <!--当获取连接失败时的重试次数-->

    </bean>
    <!--3、配置sqlSessionFactory ,进行mybatis和spring的整合 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 配置mybatis全局配置文件 /imoocDemo1/src/main/resources/mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml" />
        <!-- 配置entity包，也就是实体类包，自动扫描，用于别名配置 -->
        <property name="typeAliasesPackage" value="com.seckill.entity"></property>
        <!-- 配置需要扫描的mapper.xml文件 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
    </bean>

    <!-- 4、配置扫描dao接口包，动态实现mapper接口，注入到spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory,请注意不要使用sqlSessionFactoryBean,否则会出现注入异常 -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
        <!--给出要扫描的mapper接口 -->
        <property name="basePackage" value="com.seckill.dao" />
    </bean>

    <!--注入redis-dao-->
    <bean id ="JedisDao" class="com.seckill.dao.cache.RedisDao">
        <constructor-arg index="0" value="localhost"/>
        <constructor-arg index="1" value="6379"/>
    </bean>
</beans>

另外，建立jdbc.properties配置文件，用于数据库信息的读取

jdbc.driver=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=password
jdbc.url=jdbc\:mysql\://localhost\:3306/seckill?useUnicode\=true&characterEncoding\=UTF-8&serverTimezone\=UTC&useSSL\=false

9、单元测试

对SeckillDao以及SuccessKilledDao接口，数据的操作进行测试
在test.java下建立com.seckill.dao包,IDEA里面有一个快速建立测试的快捷键Ctrl+Shift+T
SeckillDaoTest

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:spring/spring-dao.xml")
public class SeckillDaoTest {

    //注入需要测试的类的实例
    @Resource
    private SeckillDao seckillDao;

    @Test
    public void querySeckillNumber() throws Exception {

        System.out.println(seckillDao.querySeckillNumber());
    }
    @Test
    public void reduceNumber() throws Exception {
        long seckillId = 1000;
        Date killTime = new Date();
        int i = seckillDao.reduceNumber(seckillId, killTime);
        System.out.println(i);
    }

    @Test
    public void queryById() throws Exception {
        long seckillId = 1000;
        Seckill seckill = seckillDao.queryById(seckillId);
        System.out.println(seckill.toString());
    }

    @Test
    public void queryAll() throws Exception {
        int offset = 2;
        int limit = 3;
        List<Seckill> list = seckillDao.queryAll(offset, limit);
        Iterator iterator  = list.iterator();
        while(iterator.hasNext()) System.out.println(iterator.next());
    }

}

SuccessKilledDaoTest:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:spring/spring-dao.xml")
public class SuccessKilledDaoTest {

    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @Resource
    private SuccessKilledDao successKilledDao;

    @Test
    public void insertSuccessKilled() throws Exception {

        long seckillId = 1009L;
        long userPhone = 18126745521L;

        int result = successKilledDao.insertSuccessKilled(seckillId, userPhone);
        logger.info(Integer.toString(result));
    }

    @Test
    public void queryByIdWithSeckill() throws Exception {

        long seckillId = 1001L;
        long userPhone = 18126745520L;

        SuccessKilled successKilled = successKilledDao.queryByIdWithSeckill(seckillId, userPhone);
        logger.info(successKilled.toString());

    }