SSM整合

Posted 2023-02-10 想成为大师啊

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环境要求

IDEA
mysql 8
Tomcat 9.0.52
Maven 3.6

要求：需要熟练掌握MySQL数据库，Spring，JavaWeb及MyBatis知识，简单的前端知识；

数据库环境

创建一个存放书籍数据的数据库表

CREATE DATABASE `ssmbuild`;
USE `ssmbuild`;
DROP TABLE IF EXISTS `books`;
CREATE TABLE `books` (
  `bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
  `bookName` VARCHAR(100) NOT NULL COMMENT '书名',
  `bookCounts` INT(11) NOT NULL COMMENT '数量',
  `detail` VARCHAR(200) NOT NULL COMMENT '描述',
  KEY `bookID` (`bookID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8
INSERT  INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES 
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');

基本环境搭建

新建一Maven项目！ ssmbuild ，添加web的支持

导入相关的pom依赖！

<dependencies>
    <!--Junit-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <!--数据库驱动-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.22</version>
    </dependency>
<!--        <dependency>-->
<!--            <groupId>mysql</groupId>-->
<!--            <artifactId>mysql-connector-java</artifactId>-->
<!--            <version>5.1.47</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>servlet-api</artifactId>
        <version>2.5</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>2.0.2</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>

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>

建立基本结构和配置框架！

com.zya.pojo
com.zya.dao
com.zya.service
com.zya.controller

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>
</configuration>

applicationContext.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>

Mybatis层编写

数据库配置文件 database.properties（mysql 8版本以上的需要加上时区）

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/ssmbuild?characterEncoding=utf-8&serverTimezone=GMT%2B8
username=root
password=zya11230318

数据库配置文件 database.properties（mysql 5版本）

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=zya11230318

IDEA关联数据库

编写MyBatis的核心配置文件

<?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>

    <!-- 配置数据源, 交给Spring去做 -->
    <typeAliases>
        <package name="com.zya.pojo"/>
    </typeAliases>

    <!-- 绑定接口 -->
    <mappers>
        <mapper class="com.zya.dao.BookMapper" />
    </mappers>
    
</configuration>

编写数据库对应的实体类 com.zya.pojo.Books

package com.zya.pojo;

import lombok.*;

/**
 * @author : byZYA
 * @date : 2022/4/4 23:48
 * @description : xxx
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Books 

    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;

编写Dao层的 Mapper接口！

package com.zya.dao;

import com.zya.pojo.Books;

import java.util.List;

/**
 * @author : byZYA
 * @date : 2022/4/4 23:51
 * @description : xxx
 */
public interface BookMapper 

    /**
     * 增加一本书
     */
    int addBook(Books books);

    /**
     * 删除一本书
     */
    int deleteBookById(int id);

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

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

    /**
     * 查询所有的书
     */
    List<Books> queryAllBook();

编写接口对应的 Mapper.xml 文件。需要导入MyBatis的包；

<?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.zya.dao.BookMapper">

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

</mapper>

编写Service层的接口和实现类

接口：

package com.zya.service;

import com.zya.pojo.Books;

import java.util.List;

/**
 * @author : byZYA
 * @date : 2022/4/5 0:02
 * @description : xxx
 */
public interface BookService 
    /**
     * 增加一本书
     */
    int addBook(Books books);

    /**
     * 删除一本书
     */
    int deleteBookById(int id);

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

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

    /**
     * 查询所有的书
     */
    List<Books> queryAllBook();

实现类：

package com.zya.service;

import com.zya.dao.BookMapper;
import com.zya.pojo.Books;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.List;

/**
 * @author : byZYA
 * @date : 2022/4/5 0:03
 * @description : xxx
 */
public class BookServiceImpl implements BookService 

    // service调dao层: 组合Dao
    @Autowired
    private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper) 
        this.bookMapper = bookMapper;
    

    public int addBook(Books books) 
        return bookMapper.addBook(books);
    

    public int deleteBookById(int id) 
        return bookMapper.deleteBookById(id);
    

    public int updateBook(Books books) 
        return bookMapper.updateBook(books);
    

    public Books queryBookById(int id) 
        return bookMapper.queryBookById(id);
    

    public List<Books> queryAllBook() 
        return bookMapper.queryAllBook();

OK，到此，底层需求操作编写完毕！

Spring层

配置Spring整合MyBatis，我们这里数据源使用c3p0连接池；

我们去编写Spring整合Mybatis的相关的配置文件； 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">

    <!-- 1、关联数据库配置文件 -->
    <context:property-placeholder location="classpath:database.properties" />

    <!-- 2、连接池
        dbcp: 半自动化操作, 不能自动连接
        c3p0: 自动化操作(自动化的加载配置文件, 并且可以自动设置到对象中)
        druid: hikari
     -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="$driver" />
        <property name="jdbcUrl" value="$url" />
        <property name="user" value="$username" />
        <property name="password" value="$password" />
    </bean>

    <!-- 3、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>

    <!-- 4、配置dao接口扫描包, 动态的实现了Dao接口可以注入到Spring容器中 -->
    <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.zya.dao" />
    </bean>


</beans>

Spring整合service层

<?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">

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

    <!-- 2、将我们的所有业务类, 注入到Spring, 可以通过配置, 或者注解实现 -->
    <bean id="BookServiceImpl" class="com.zya.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper" />
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