SSM框架整合的文章（1）

1：SSM框架相关依赖

<dependencies>
<dependency>
<!--使用junit4，4以上使用注解-->
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!--补全项目依赖-->
<!--1:日志，java日志：slf4j,log4j,logback,common-logging
使用：slf4j+logBack
-->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.5.6</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.1.1</version>
</dependency>
<!--2:数据库相关依赖-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.35</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<!--DAO框架：MyBatis依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.3.0</version>
</dependency>
<!--myBatis自身实现的spring整合依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.3</version>
</dependency>
<!--3:Servlet web相关依赖-->
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.4</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>

<!--4:spring依赖-->
<!--spring核心依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<!--spring dao层依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<!--spring web相关依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<!--spring test相关依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>

<!--引入一些工具类-->
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2</version>
</dependency>

</dependencies>

2：创建org.forezp.entity包，根据数据库字段，编写实体。
下面是Seckill库存实体：

public class Seckill {
private long seckillId;
private String name;
private int number;
private Date startTime;
private Date endTime;
private Date createTime;
//这里省去了写getter setter方法
}

3：创建org.forezp.dao包，编写Seckill接口

public interface SeckillDao {
//减库存
int reduceNumber(@Param("seckillId")long seckillId,@Param("killTime")Date killTime);
//根据Id查询秒杀对象
Seckill queryById(long seckillId);
//根据偏移量查询秒杀列表
List<Seckill> queryAll(@Param("offset")int offset,@Param("limit")int limit);

4：创建maaper文件夹，所有的接口实现类放在这里 ，另外项目采用xml的方式实现接口。采用这种方式的好处有很多，比如可以采用包扫描，更少的配置，所有的sql语句都放在这里，有利于统一规范，代码的可维护性和可读性也大大提高。
?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="org.forezp.dao.SeckillDao">

<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="Seckill" parameterType="long">
select seckill_id,name,number,start_time,end_time,create_time from seckill
where seckill_id = #{seckillId}
</select>

<select id="queryAll" resultType="Seckill">
select seckill_id,name,number,start_time,end_time,create_time
from seckill
order by create_time desc
limit #{offset},#{limit}
</select>

</mapper>

5:mybatis的配置，创建mybatis-config.xml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">

<!-- 配置全局属性 -->

<settings>
<!--使用jdbc的getGeneratedKeys 获取数据库的自增主键值-->
<setting name="useGeneratedKeys" value="true"/>
<!--使用别名替换列名 默认true
select name as title from table
-->
<setting name="useColumnLabel" value="true"/>
<!--开启驼峰命名转换-->
<setting name="mapUnderscoreToCamelCase" value="true"/>

</settings>

</configuration>



6：创建jdbc.properties文件，数据库配置文件和连接数据库驱动。
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/seckill?useUnicode=true&characterEncoding=utf8
username=root
password=1237：mybatis和spring的结合使用
<?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.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.配置连接池属性-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">

<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://127.0.0.1:3306/seckill"/>
<property name="username" value="root"/>
<property name="password" value="123"/>

</bean>

<!--３.配置SqlSessionFactory对象-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--注入数据库连接池-->
<property name="dataSource" ref="dataSource"/>
<!--配置mybatis全局配置文件:mybatis-config.xml-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<!--扫描entity包,使用别名,多个用;隔开-->
<property name="typeAliasesPackage" value="org.forezp.entity"/>
<!--扫描sql配置文件:mapper需要的xml文件-->
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
</bean>

<!--４:配置扫描Dao接口包,动态实现DAO接口,注入到spring容器-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--注入SqlSessionFactory-->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 给出需要扫描的Dao接口-->
<property name="basePackage" value="org.forezp.dao"/>
</bean>
</beans>

就这样mybatis和spring就整合好了，spring 提供了的ioc容器，为我们管理bean，我们不需要管理bean的生命周期.
8：测试

采用junit单元测试，spring 对junit做了很好的支持。只需要配置注解久可以了

/**
* 配置spring和junit整合，junit启动时加载springIOC容器
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath*:spring/spring-dao.xml"})
public class SeckillDaoTest {

@Test
public void reduceNumber() throws Exception {
Date killTIme=new Date();
int updateCount =seckillDao.reduceNumber(1000L,killTIme);
System.out.println(updateCount);
//结果第一次执行为1 后面为0

}
//注入Dao实现类依赖
@Resource
private SeckillDao seckillDao;
@Test
public void queryById() throws Exception {
long id=1001;
Seckill seckill=seckillDao.queryById(id);
System.out.println(seckill.getName());
System.out.println(seckill);
//运行结果
/** 500元秒杀ipad2*／
／** Seckill{seckillId=1001, name='500元秒杀ipad2',number=200, startTime=Sun Nov 01 00:00:00 CST 2015, endTime=Mon Nov 02 00:00:00 CST 2015, createTime=Sun Nov 27 10:44:30 CST 2016}*/
}

@Test
public void queryAll() throws Exception {
//java没有保存形参的记录，queryAll(int offeset,int limit)->queryAll(arg0,arg1),通过@param注解来解决

List<Seckill> seckills=seckillDao.queryAll(0,100);
for(Seckill seckill:seckills){
System.out.println(seckill);
}
}

}