SSM整合（一）——配置

环境

• IDEA
• MySQL 8.0
• Tomcat9
• maven3.6

搭建MySQL数据库

create database ssmproject;

use ssmproject;

create table books (
bookID int(10) not null auto_increment comment '书本ID',
bookName varchar(100) not null comment '书名',
bookCounts int(11) not null comment '数量',
detail varchar(200) not null comment '书本描述',
primary key(bookID)
)engine=innodb default charset=utf8;

insert into books (bookID,bookName,bookCounts,detail) values
(1,'Java',1,'好学，呜呜'),
(2,'MySQL',3,'好学，呜呜'),
(3,'WEB',10,'好学，呜呜');

新建一个Maven项目ssmProject，添加web支持。

导入依赖到pom.xml

<?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>com.lyr</groupId>
    <artifactId>ssmProject</artifactId>
    <version>1.0-SNAPSHOT</version>


    <dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>
        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.19</version>
        </dependency>
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <!--Servlet - JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</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>2.0.3</version>
        </dependency>

        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>
        <!--spring操作数据库的依赖-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.10</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>


    <!--Maven资源过滤设置-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <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>

建立基本结构

• com.lyr.pojo
• com.lyr.dao
• com.lyr.service
• com.lyr.controller

MyBatis层配置

实体类Books：

package com.lyr.pojo;

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

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Books {
    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;
}

配置database.properties：

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmproject?useSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
jdbc.username=root
jdbc.password=root

MyBatis核心配置文件，不过现在核心配置都是用spring实现：

<?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>

    <typeAliases>
        <package name="com.lyr.pojo"/>
    </typeAliases>

    <mappers>
        <mapper resource="com/lyr/dao/BooksMapper.xml"/>
    </mappers>

</configuration>

dao层接口BooksMapper：

package com.lyr.dao;

import com.lyr.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BooksMapper {
    //增加一本书
    int addBook(Books books);

    //删除一本书
    int deleteBook(@Param("bookID") int id);

    //修改一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBook(@Param("bookID") int id);

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

BooksMapper对应的配置文件BooksMapper.xml：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.lyr.dao.BooksMapper">
    <insert id="addBook" parameterType="Books">
        insert into books (bookName,bookCounts,detail)
        values (#{bookName},#{bookCounts},#{detail})
    </insert>

    <delete id="deleteBook" parameterType="int">
        delete from books where bookID=#{bookID}
    </delete>

    <update id="updateBook" parameterType="Books">
        update books
         set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
        where id=#{bookID}
    </update>

    <select id="queryBook" parameterType="int" resultType="Books">
        select * from books where bookID=#{bookID}
    </select>

    <select id="queryAllBooks" resultType="Books">
        select * from books
    </select>
</mapper>

service层接口BookService：

扫描二维码关注公众号，回复： 10751371 查看本文章

package com.lyr.service;

import com.lyr.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookService {
    int addBook(Books books);

    int deleteBook(@Param("bookID") int id);

    int updateBook(Books books);

    Books queryBook(@Param("bookID") int id);

    List<Books> queryAllBooks();
}

BookService对应实现类BookServiceImpl：

package com.lyr.service;

import com.lyr.dao.BooksMapper;
import com.lyr.pojo.Books;

import java.security.PrivateKey;
import java.util.List;

public class BookServiceImpl implements BookService {
    private BooksMapper booksMapper;

    public void setBooksMapper(BooksMapper booksMapper) {
        this.booksMapper = booksMapper;
    }

    public int addBook(Books books) {
        return booksMapper.addBook(books);
    }

    public int deleteBook(int id) {
        return booksMapper.deleteBook(id);
    }

    public int updateBook(Books books) {
        return booksMapper.updateBook(books);
    }

    public Books queryBook(int id) {
        return booksMapper.queryBook(id);
    }

    public List<Books> queryAllBooks() {
        return booksMapper.queryAllBooks();
    }
}

Spring层配置

Spring整合MyBatis的配置spring-dao.xml，使用的C3P0连接池：

<?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">
    
    <!--配置数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!--连接池:C3P0-->
    <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}"/>

        <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"/>
        <!--当前连接失败重试次数-->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

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

    <!--配置dao接口扫描包，动态实现了Dao接口可以注入到Spring容器中
    代替了BookMapperImpl实现类-->
    <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="com.lyr.dao"/>
    </bean>
    
</beans>

Spring整合Service层：spring-service.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
    http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 1.扫描service下的包-->
    <context:component-scan base-package="com.lyr.service"/>

    <!--2.将我们的所有业务类，注入到Spring，-->
    <bean id="BookServiceImpl" class="com.lyr.service.BookServiceImpl">
        <property name="booksMapper" ref="booksMapper"/>
    </bean>

    <!--3.声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入数据源-->
        <property name="dataSource" ref="datasource"/>
    </bean>
</beans>

SpringMVC层配置

web.xml配置：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!--DispatcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--乱码过滤-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--Session-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

spring-mvc.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"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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
    http://www.springframework.org/schema/mvc
    https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--1.扫描包：controller-->
    <context:component-scan base-package="com.lyr.controller"/>
    <!--2.静态资源过滤-->
    <mvc:default-servlet-handler/>
    <!--注解驱动-->
    <mvc:annotation-driven/>

    <!--4.视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

在applicationContext.xml中把他们放在一起

<?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">

    <import resource="spring-dao.xml"/>
    <import resource="spring-service.xml"/>
    <import resource="spring-mvc.xml"/>
    
</beans>

接下来就可以进行增删改查了