SSM整合

一、环境准备

环境说明：

  • IDEA 2020.3
  • Mysql 8.0.21
  • Tomcat 9
  • Maven 3.6.3

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；

一、数据库搭建

创建一个存放书籍数据的数据库表：

  1. CREATE DATABASE `ssmbuild`;
  3. USE `ssmbuild`;
  5. DROP TABLE IF EXISTS `books`;
  7. CREATE TABLE `books` (
  8. `bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
  9. `bookName` VARCHAR(100) NOT NULL COMMENT '书名',
  10. `bookCounts` INT(11) NOT NULL COMMENT '数量',
  11. `detail` VARCHAR(200) NOT NULL COMMENT '描述',
  12. KEY `bookID` (`bookID`)
  13. ) ENGINE=INNODB DEFAULT CHARSET=utf8;
  15. INSERT  INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
  16. (1,'Java',1,'从入门到放弃'),
  17. (2,'MySQL',10,'从删库到跑路'),
  18. (3,'Linux',5,'从进门到进牢');

二、基本环境搭建

1、新建一个Maven项目！SSM ， 添加web的支持

2、导入相关的pom依赖！

  1. <dependencies>
  2.     <dependency>
  3.         <!--Junit-->
  4.         <groupId>junit</groupId>
  5.         <artifactId>junit</artifactId>
  6.         <version>4.13</version>
  7.         <scope>test</scope>
  8.     </dependency>
  10.         <!--数据库驱动-->
  11.         <dependency>
  12.             <groupId>mysql</groupId>
  13.             <artifactId>mysql-connector-java</artifactId>
  14.             <version>8.0.20</version>
  15.         </dependency>
  17.         <!-- 数据库连接池 -->
  18.         <dependency>
  19.             <groupId>com.mchange</groupId>
  20.             <artifactId>c3p0</artifactId>
  21.             <version>0.9.5.2</version>
  22.         </dependency>
  24.         <!--Servlet - JSP -->
  25.         <dependency>
  26.             <groupId>javax.servlet</groupId>
  27.             <artifactId>servlet-api</artifactId>
  28.             <version>2.5</version>
  29.         </dependency>
  30.         <dependency>
  31.             <groupId>javax.servlet.jsp</groupId>
  32.             <artifactId>jsp-api</artifactId>
  33.             <version>2.2</version>
  34.         </dependency>
  35.         <dependency>
  36.             <groupId>javax.servlet</groupId>
  37.             <artifactId>jstl</artifactId>
  38.             <version>1.2</version>
  39.         </dependency>
  41.         <!--Mybatis-->
  42.         <dependency>
  43.             <groupId>org.mybatis</groupId>
  44.             <artifactId>mybatis</artifactId>
  45.             <version>3.5.6</version>
  46.         </dependency>
  47.         <dependency>
  48.             <groupId>org.mybatis</groupId>
  49.             <artifactId>mybatis-spring</artifactId>
  50.             <version>2.0.2</version>
  51.         </dependency>
  53.         <!--Spring-->
  54.         <dependency>
  55.             <groupId>org.springframework</groupId>
  56.             <artifactId>spring-webmvc</artifactId>
  57.             <version>5.2.9.RELEASE</version>
  58.         </dependency>
  59.         <dependency>
  60.             <groupId>org.springframework</groupId>
  61.             <artifactId>spring-jdbc</artifactId>
  62.             <version>5.2.9.RELEASE</version>
  63.         </dependency>
  64.     <!--        lombok插件：懒人福音-->
  65.         <dependency>
  66.             <groupId>org.projectlombok</groupId>
  67.             <artifactId>lombok</artifactId>
  68.             <version>1.18.16</version>
  69.         </dependency>
  70. </dependencies>

3、Maven资源过滤设置

  1. <build>
  2.     <resources>
  3.         <resource>
  4.             <directory>src/main/java</directory>
  5.             <includes>
  6.                 <include>**/*.properties</include>
  7.                 <include>**/*.xml</include>
  8.             </includes>
  9.             <filtering>false</filtering>
  10.         </resource>
  11.         <resource>
  12.             <directory>src/main/resources</directory>
  13.             <includes>
  14.                 <include>**/*.properties</include>
  15.                 <include>**/*.xml</include>
  16.             </includes>
  17.             <filtering>false</filtering>
  18.         </resource>
  19.     </resources>
  20. </build>

4、建立基本结构和配置框架！

项目结构如下：

SSM整合 - 图1

  • com.chen66.pojo
  • com.chen66.dao
  • com.chen66.service
  • com.chen66.controller
  • mybatis-config.xml ```xml <?xml version=”1.0” encoding=”UTF-8” ?> <!DOCTYPE configuration
    1.  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
    2.  "http://mybatis.org/dtd/mybatis-3-config.dtd">

  2. - application-config.xml
  3. ```xml
  4. <?xml version="1.0" encoding="UTF-8"?>
  5. <beans xmlns="http://www.springframework.org/schema/beans"
  6.       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  7.       xsi:schemaLocation="http://www.springframework.org/schema/beans
  8.        http://www.springframework.org/schema/beans/spring-beans.xsd">
  10. </beans>

二、Mybatis层

1、数据库配置文件 db.properties

  1. driver=com.mysql.cj.jdbc.Driver
  2. url=jdbc:mysql://localhost:3306/ssmbuild?serverTimezone=Asia/Shanghai&useSSL=true&useUnicode=true&characterEncoding=UTF-8
  3. username=root
  4. password=root

2、IDEA关联数据库

3、编写MyBatis的核心配置文件

  1. <?xml version="1.0" encoding="UTF-8" ?>
  2. <!DOCTYPE configuration
  3.         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  4.         "http://mybatis.org/dtd/mybatis-3-config.dtd">
  5. <configuration>
  7.     <typeAliases>
  8.         <package name="com.chen66.pojo"/>
  9.     </typeAliases>
  10.     <mappers>
  11.         <mapper resource="com/chen66/dao/BookMapper.xml"/>
  12.     </mappers>
  14. </configuration>

4、编写数据库对应的实体类 com.chen66.pojo.Books

Books.java

使用lombok插件！

  1. package com.chen66.pojo;
  4. import lombok.AllArgsConstructor;
  5. import lombok.Data;
  6. import lombok.NoArgsConstructor;
  8. @Data
  9. @AllArgsConstructor
  10. @NoArgsConstructor
  11. public class Books {
  12.     private int bookID;
  13.     private String bookName;
  14.     private int bookCounts;
  15.     private String detail;
  16. }

5、编写Dao层的 Mapper接口！

  1. public interface BookMapper {
  2.     //增加书籍
  3.     int addBook(Books books);
  4.     //删除书籍,通过Id删除
  5.     int deleteBook(@Param("BookId") int id);
  6.     //修改书籍
  7.     int updateBook(Books books);
  8.     //查找书籍
  9.     //通过Id查找
  10.     Books queryBookById(@Param("BookId") int id);
  11.     //查找所有书籍
  12.     List<Books> queryAllBooks();
  13. }

6、编写接口对应的 Mapper.xml 文件。需要导入MyBatis的包；

  1. <?xml version="1.0" encoding="UTF-8" ?>
  2. <!DOCTYPE mapper
  3.         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  4.         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  5. <mapper namespace="com.chen66.dao.BookMapper">
  6.     <!--    增加书籍-->
  7.     <insert id="addBook" parameterType="Books">
  8.         insert into books(bookId,bookName,bookCounts,detail) values(#{bookId},#{bookName},#{bookCounts},#{detail})
  9.     </insert>
  10.     <!--    删除书籍,通过Id删除-->
  11.     <delete id="deleteBook" parameterType="_int">
  12.         delete from books where bookID=#{BookId}
  13.     </delete>
  14.     <!--    修改书籍-->
  15.     <update id="updateBook" parameterType="Books">
  16.         update books
  17.         set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
  18.         where bookId=#{bookId}
  19.     </update>
  20.     <!--    通过Id查找-->
  21.     <select id="queryBookById" resultType="Books">
  22.         select *from ssmbuild.books where bookID=#{BookId}
  23.     </select>
  24.     <!--    查找所有书籍-->
  25.     <select id="queryAllBooks" resultType="Books">
  26.         select *from books
  27.     </select>
  28. </mapper>

7、编写Service层的接口和实现类

  1. package com.chen66.service;
  3. import com.chen66.dao.BookMapper;
  4. import com.chen66.pojo.Books;
  6. import java.util.List;
  8. public class BookServiceImpl implements BookService{
  9.     //调用dao层的操作，设置一个set接口，方便Spring管理
  10.     private BookMapper bookMapper;
  12.     public void setBookMapper(BookMapper bookMapper) {
  13.         this.bookMapper = bookMapper;
  14.     }
  16.     @Override
  17.     public int addBook(Books books) {
  18.         return bookMapper.addBook(books);
  19.     }
  21.     @Override
  22.     public int deleteBook(int id) {
  23.         return bookMapper.deleteBook(id);
  24.     }
  26.     @Override
  27.     public int updateBook(Books books) {
  28.         return bookMapper.updateBook(books);
  29.     }
  31.     @Override
  32.     public Books queryBookById(int id) {
  33.         return bookMapper.queryBookById(id);
  34.     }
  36.     @Override
  37.     public List<Books> queryAllBooks() {
  38.         return bookMapper.queryAllBooks();
  39.     }
  40. }

三、Spring层

1、配置Spring整合MyBatis，我们这里数据源使用c3p0连接池；

2、我们去编写Spring整合Mybatis的相关的配置文件；

spring-dao.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.        xmlns:context="http://www.springframework.org/schema/context"
  5.        xsi:schemaLocation="http://www.springframework.org/schema/beans
  6.        http://www.springframework.org/schema/beans/spring-beans.xsd
  7.        http://www.springframework.org/schema/context
  8.        https://www.springframework.org/schema/context/spring-context.xsd">
  10.     <!-- 配置整合mybatis -->
  11.     <!-- 1.关联数据库文件 -->
  12.     <context:property-placeholder location="classpath:db.properties"/>
  14.     <!-- 2.数据库连接池 -->
  15.     <!--数据库连接池
  16.         dbcp 半自动化操作 不能自动连接
  17.         c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面）
  18.     -->
  19.     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
  20.         <!-- 配置连接池属性 -->
  21.         <property name="driverClass" value="${jdbc.driver}"/>
  22.         <property name="jdbcUrl" value="${jdbc.url}"/>
  23.         <property name="user" value="${jdbc.username}"/>
  24.         <property name="password" value="${jdbc.password}"/>
  26.         <!-- c3p0连接池的私有属性 -->
  27.         <property name="maxPoolSize" value="30"/>
  28.         <property name="minPoolSize" value="10"/>
  29.         <!-- 关闭连接后不自动commit -->
  30.         <property name="autoCommitOnClose" value="false"/>
  31.         <!-- 获取连接超时时间 -->
  32.         <property name="checkoutTimeout" value="10000"/>
  33.         <!-- 当获取连接失败重试次数 -->
  34.         <property name="acquireRetryAttempts" value="2"/>
  35.     </bean>
  37.     <!-- 3.配置SqlSessionFactory对象 -->
  38.     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
  39.         <!-- 注入数据库连接池 -->
  40.         <property name="dataSource" ref="dataSource"/>
  41.         <!-- 配置Mybatis全局配置文件:mybatis-config.xml -->
  42.         <property name="configLocation" value="classpath:mybatis-config.xml"/>
  43.     </bean>
  45.     <!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
  46.     <!--解释 ：https://www.cnblogs.com/jpfss/p/7799806.html-->
  47.     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
  48.         <!-- 注入sqlSessionFactory -->
  49.         <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
  50.         <!-- 给出需要扫描Dao接口包 -->
  51.         <property name="basePackage" value="com.chen66.dao"/>
  52.     </bean>
  54. </beans>

3、Spring整合service层

新建一个资源文件spring-service.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.        xmlns:context="http://www.springframework.org/schema/context"
  5.        xsi:schemaLocation="http://www.springframework.org/schema/beans
  6.    http://www.springframework.org/schema/beans/spring-beans.xsd
  7.    http://www.springframework.org/schema/context
  8.    http://www.springframework.org/schema/context/spring-context.xsd">
  10.     <!-- 扫描service相关的bean -->
  11.     <context:component-scan base-package="com.chen66.service" />
  13.     <!--BookServiceImpl注入到IOC容器中-->
  14.     <bean id="BookServiceImpl" class="com.chen66.service.BookServiceImpl">
  15.         <property name="bookMapper" ref="bookMapper"/>
  16.     </bean>
  18.     <!-- 配置事务管理器 -->
  19.     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  20.         <!-- 注入数据库连接池 -->
  21.         <property name="dataSource" ref="dataSource" />
  22.     </bean>
  24. </beans>

四、SpringMVC层

1.web.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  5.          version="4.0">
  6.     <servlet>
  7.         <servlet-name>springmvc</servlet-name>
  8.         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  9.         <init-param>
  10.             <param-name>contextConfigLocation</param-name>
  11.             <param-value>classpath:applicationContext.xml</param-value>
  12.             <!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！-->
  13.         </init-param>
  14.         <load-on-startup>1</load-on-startup>
  15.     </servlet>
  16.     <servlet-mapping>
  17.         <servlet-name>springmvc</servlet-name>
  18.         <url-pattern>/</url-pattern>
  19.     </servlet-mapping>
  20.     <!--encodingFilter-->
  21.     <filter>
  22.         <filter-name>encodingFilter</filter-name>
  23.         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
  24.         <init-param>
  25.             <param-name>encoding</param-name>
  26.             <param-value>utf-8</param-value>
  27.         </init-param>
  28.     </filter>
  29.     <filter-mapping>
  30.         <filter-name>encodingFilter</filter-name>
  31.         <url-pattern>/*</url-pattern>
  32.     </filter-mapping>
  33. <!--    Session过期时间-->
  34.     <session-config>
  35.         <session-timeout>15</session-timeout>
  36.     </session-config>
  37. </web-app>

2.spring-mvc.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.        xmlns:context="http://www.springframework.org/schema/context"
  5.        xmlns:mvc="http://www.springframework.org/schema/mvc"
  6.        xsi:schemaLocation="http://www.springframework.org/schema/beans
  7.    http://www.springframework.org/schema/beans/spring-beans.xsd
  8.    http://www.springframework.org/schema/context
  9.    http://www.springframework.org/schema/context/spring-context.xsd
  10.    http://www.springframework.org/schema/mvc
  11.    https://www.springframework.org/schema/mvc/spring-mvc.xsd">
  12.     <!-- 配置SpringMVC -->
  13.     <!-- 1.开启SpringMVC注解驱动 -->
  14.     <mvc:annotation-driven/>
  15.     <!-- 2.静态资源默认servlet配置-->
  16.     <mvc:default-servlet-handler/>
  17.     <!-- 3.配置jsp 显示ViewResolver视图解析器 -->
  18.     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  19.         <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
  20.         <property name="prefix" value="/WEB-INF/jsp/"/>
  21.         <property name="suffix" value=".jsp"/>
  22.     </bean>
  23.     <!-- 4.扫描web相关的bean -->
  24.     <context:component-scan base-package="com.chen66.controller" />
  25. </beans>

3、Spring配置整合文件，applicationContext.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.        xsi:schemaLocation="http://www.springframework.org/schema/beans
  5.        http://www.springframework.org/schema/beans/spring-beans.xsd">
  6.     <import resource="spring-dao.xml"/>
  7.     <import resource="spring-service.xml"/>
  8.     <import resource="spring-mvc.xml"/>
  9. </beans>