SSM整合练习

1.新建一个普通的maven项目,在pom.xml中导入ssm项目所需要的所有依赖

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.js.ccit</groupId>
    <artifactId>ssmbuild</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <!--依赖导入-->
    <dependencies>
        <!-- 单元测试 junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>

        <!--数据库驱动 mysql-connector -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.24</version>
        </dependency>

        <!-- 数据库连接池 c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.5</version>
        </dependency>

        <!-- Servlet:servlet支持-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>

        <!-- Jsp:jsp支持 -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>

        <!-- jstl  标准标签库 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.1</version>
        </dependency>

        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>      
        </dependencies>

    <!--静态资源导出问题-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <!--可以添加其他类型文件-->
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>
</project>

2.使用ide连接数据库

3.建包结构

4.添加配置文件

1.mybatis核心配置文件 mybatis-config.xml 先写头文件

<?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>

</configuration>

2.spring核心配置文件 applicationContext.xml 先写头文件

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

</beans>

数据库配置文件 c3p0.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3308/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=admin

 
 <!--  lombok 偷懒插件 -->
   <dependency>
     <groupId>org.projectlombok</groupId>
     <artifactId>lombok</artifactId>
     <version>1.18.12</version>
     <scope>provided</scope>
   </dependency>

用法: https://projectlombok.org/features/all

3.补充 mybatis-config.xml

<?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>

    <!-- 配置数据源,交给spring去做了,此处不做处理-->


    <!-- 取别名 cn.js.ccit.pojo包下的类自动取别名-->
    <typeAliases>
        <package name="cn.js.ccit.pojo"/>
    </typeAliases>


</configuration>

4.创建实体类

package cn.js.ccit.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author Vis.Yang
 * @project_name
 * @date 2022-01-06 15:53
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
    private int bookId;
    private String bookName;
    private int bookCounts;
    private String detail;
}
//@Data  GET/SET/toString/hash/equals
//@AllArgsConstructor 有参构造
//@NoArgsConstructor  无参构造

4.编写dao层的接口

package cn.js.ccit.dao;

import cn.js.ccit.pojo.Books;

import java.util.List;

/**
 * @author Vis.Yang
 * @project_name
 * @date 2022-01-06 16:15
 */

@SuppressWarnings("ALL")
public interface BookMapper {
    //添加书籍
    int addBook(Books books);

    //删除书籍
    int deleteBookById(int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(int id);

    //查询所有书籍
    List<Books> queryAllBooks();
}

5.创建一个mapper.xml 实现接口中的方法

<?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="cn.js.ccit.dao.BookMapper">

    <insert id="addBook" parameterType="Books">
        insert into books (bookName,bookCounts,detail)
        values (#{bookName},#{bookCounts},#{detail});
    </insert>
    
    <delete id="deleteBookById" parameterType="int">
        delete from books where bookID=#{bookID};
    </delete>
    
    <update id="updateBook" parameterType="Books">
        update books set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail} where bookID=#{bookID};
    </update>
    
    <select id="queryBookById" resultType="Books">
        select * from books where bookID=#{bookID};
    </select>
    
    <select id="queryAllBooks" resultType="Books">
        select * from books
    </select>
    
</mapper>

补充 mybatis-config.xml 绑定刚刚写的mapper

<?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>

    <!-- 配置数据源,交给spring去做了,此处不做处理-->


    <!-- 取别名 cn.js.ccit.pojo包下的类自动取别名-->
    <typeAliases>
        <package name="cn.js.ccit.pojo"/>
    </typeAliases>

    <!-- 配置mapper-->
    <mappers>
        <!-- 接口与实现mapper同名时可以这样用 -->
        <!-- <mapper class="cn.js.ccit.dao.BookMapper"></mapper-->
        <mapper resource="BookMapper.xml"></mapper>
    </mappers>

</configuration>

5.编写服务层接口

package cn.js.ccit.service;

import cn.js.ccit.pojo.Books;

import java.util.List;

/**
 * @author Vis.Yang
 * @project_name
 * @date 2022-01-06 17:04
 */
@SuppressWarnings("ALL")
public interface BookService {
    //添加书籍
    int addBook(Books books);

    //删除书籍
    int deleteBookById(int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(int id);

    //查询所有书籍
    List<Books> queryAllBooks();
}

6.实现服务层方法 service 调dao

package cn.js.ccit.service;

import cn.js.ccit.dao.BookMapper;
import cn.js.ccit.pojo.Books;

import java.util.List;

/**
 * @author Vis.Yang
 * @project_name
 * @date 2022-01-06 17:05
 */
@SuppressWarnings("ALL")
public class BookServiceImpl implements BookService {
    private BookMapper bookMapper;

    //有了注解驱动的话就可以使用注解法注入
    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }

    @Override
    public int addBook(Books books) {
        return bookMapper.addBook(books);
    }

    @Override
    public int deleteBookById(int id) {
        return bookMapper.deleteBookById(id);
    }

    @Override
    public int updateBook(Books books) {
        return bookMapper.updateBook(books);
    }

    @Override
    public Books queryBookById(int id) {
        return bookMapper.queryBookById(id);
    }

    @Override
    public List<Books> queryAllBooks() {
        return bookMapper.queryAllBooks();
    }
}

7.spring整合mybatis(dao层) 创建 spring-dao.xml

<?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
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 关联数据库配置文件-->
    <context:property-placeholder location="classpath:c3p0.properties"/>

    <!-- 数据库连接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <!-- c3p0连接池的私有属性(配置) -->
        <property name="maxPoolSize" value="30"/>
        <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="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!-- sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!-- 绑定mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--配置dao接口自动扫描包,动态实现Dao接口注入到Spring中  就不需要手动写实现类,实现接口注入了-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入 sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 要扫描的dao包-->
        <property name="basePackage" value="cn.js.ccit.dao"/>
    </bean>
</beans>