SpringMVC-狂神(5.整合SSM框架)学习笔记

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文章目录

1. 整合SSM

1. 环境要求

环境:

IDEA / Eclipse
mysql 5.7 +
Tomcat 9
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

2. 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');

3. 基本环境搭建

  1. 新建一Maven项目!ssmbuild , 添加web的支持

  2. 导入相关的pom依赖 (版本个人自己选择)

    <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>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>
    
  3. 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>
    
  4. 建立基本结构和配置框架

    • com.pojo
    • com.dao
    • com.service
    • com.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>
      

4. Mybatis层编写

  1. 数据库配置文件 database.properties

    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
    jdbc.username=root
    jdbc.password=123456
    
  2. 关联数据库,测试连接

  3. 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>
       
       <typeAliases>
           <package name="com.pojo"/>
       </typeAliases>
       <mappers>
           <mapper resource="com/dao/BookMapper.xml"/>
       </mappers>
    
    </configuration>
    
  4. 编写数据库对应的实体类 com.pojo.Books

    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class Books 
       
       private int bookID;
       private String bookName;
       private int bookCounts;
       private String detail;
       
    
    
  5. 编写Dao层的 Mapper接口

    import com.pojo.Books;
    import java.util.List;
    
    public interface BookMapper 
    
       //增加一个Book
       int addBook(Books book);
    
       //根据id删除一个Book
       int deleteBookById(int id);
    
       //更新Book
       int updateBook(Books books);
    
       //根据id查询,返回一个Book
       Books queryBookById(int id);
    
       //查询全部Book,返回list集合
       List<Books> queryAllBook();
    
    
    
  6. 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.dao.BookMapper">
    
       <!--增加一个Book-->
       <insert id="addBook" parameterType="Books">
          insert into ssmbuild.books(bookName,bookCounts,detail)
          values (#bookName, #bookCounts, #detail)
       </insert>
    
       <!--根据id删除一个Book-->
       <delete id="deleteBookById" parameterType="int">
          delete from ssmbuild.books where bookID=#bookID
       </delete>
    
       <!--更新Book-->
       <update id="updateBook" parameterType="Books">
          update ssmbuild.books
          set bookName = #bookName,bookCounts = #bookCounts,detail = #detail
          where bookID = #bookID
       </update>
    
       <!--根据id查询,返回一个Book-->
       <select id="queryBookById" resultType="Books">
          select * from ssmbuild.books
          where bookID = #bookID
       </select>
    
       <!--查询全部Book-->
       <select id="queryAllBook" resultType="Books">
          SELECT * from ssmbuild.books
       </select>
    
    </mapper>
    
  7. 编写Service层的接口和实现类
    接口

    import com.pojo.Books;
    
    import java.util.List;
    
    //BookService:底下需要去实现,调用dao层
    public interface BookService 
       //增加一个Book
       int addBook(Books book);
       //根据id删除一个Book
       int deleteBookById(int id);
       //更新Book
       int updateBook(Books books);
       //根据id查询,返回一个Book
       Books queryBookById(int id);
       //查询全部Book,返回list集合
       List<Books> queryAllBook();
    
    

    实现类

    import com.dao.BookMapper;
    import com.pojo.Books;
    import java.util.List;
    
    public class BookServiceImpl implements BookService 
    
       //调用dao层的操作,设置一个set接口,方便Spring管理
       private BookMapper bookMapper;
    
       public void setBookMapper(BookMapper bookMapper) 
           this.bookMapper = bookMapper;
      
       
       public int addBook(Books book) 
           return bookMapper.addBook(book);
      
       
       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

5. 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

    <?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">
    
       <!-- 配置整合mybatis -->
       <!-- 1.关联数据库文件 -->
       <context:property-placeholder location="classpath:database.properties"/>
    
       <!-- 2.数据库连接池 -->
       <!--数据库连接池
           dbcp 半自动化操作 不能自动连接
           c3p0 自动化操作(自动的加载配置文件 并且设置到对象里面)
       -->
       <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
           <!-- 配置连接池属性 -->
           <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 -->
           <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>
    
       <!-- 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MyBaties全局配置文件:mybatis-config.xml -->
           <property name="configLocation" value="classpath:mybatis-config.xml"/>
       </bean>
    
       <!-- 4.配置扫描Dao接口包,动态实现Dao接口注入到spring容器中 -->
       <!--解释 :https://www.cnblogs.com/jpfss/p/7799806.html-->
       <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
           <!-- 注入sqlSessionFactory , 这里的 Value 就是上面的 ID -->
           <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
           <!-- 给出需要扫描Dao接口包 -->
           <property name="basePackage" value="com.dao"/>
       </bean>
    
    </beans>
    
  3. 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
       http://www.springframework.org/schema/context/spring-context.xsd">
    
       <!-- 扫描service相关的bean -->
       <context:component-scan base-package="com.service" />
    
       <!--BookServiceImpl注入到IOC容器中-->
       <bean id="BookServiceImpl" class="com.service.BookServiceImpl">
           <property name="bookMapper" ref="bookMapper"/>
       </bean>
    
       <!-- 配置事务管理器 -->
       <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager以上是关于SpringMVC-狂神(5.整合SSM框架)学习笔记的主要内容,如果未能解决你的问题,请参考以下文章

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