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
1、新建一Maven项目！ssmbuild ， 添加web的支持
2、导入相关的pom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>org.example</groupId> <artifactId>ssmbuild</artifactId> <version>1.0-SNAPSHOT</version> <!--依赖问题--> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13</version> <scope>test</scope> </dependency> <!-- mybatis--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.4</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.4</version> </dependency> <!--数据库 数据库连接池--> <!-- <dependency>--> <!-- <groupId>c3p0</groupId>--> <!-- <artifactId>c3p0</artifactId>--> <!-- <version>0.9.1.2</version>--> <!-- </dependency>--> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.20</version> </dependency> <!-- servlet jsp --> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2.1-b03</version> </dependency> <dependency> <groupId>org.apache.tomcat</groupId> <artifactId>servlet-api</artifactId> <version>6.0.29</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <!-- spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.2.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>5.2.6.RELEASE</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.12</version> </dependency> </dependencies> <!-- 静态资源导出--> <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>
web.xml
<?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>DispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <!--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！--> <param-value>classpath:applicationContext.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>DispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!--encodingFilter--> <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过期时间--> <session-config> <session-timeout>15</session-timeout> </session-config> </web-app>
. 建立基本结构和配置框架！
- 配置
-
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>
<!--配置数据源的工作交给spring去做了 --!> <typeAliases> <package name="com.yj.pojo"/> </typeAliases> <mappers> <mapper class="com.yj.dao.BookMapper"/> </mappers> </configuration>
- database.properties
-
jdbc.driver=com.mysql.cj.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=UTC jdbc.username=root jdbc.password=root
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> <!-- 或者直接用jdbc的连接池，上面都可以省略--> <!-- <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">--> <!-- <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>--> <!-- <property name="url" value="jdbc:mysql://localhost:3306/ssmbuild?serverTimezone=UTC"/>--> <!-- <property name="username" value="root"/>--> <!-- <property name="password" value="root"/>--> <!-- </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 --> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> <!-- 给出需要扫描Dao接口包 --> <property name="basePackage" value="com.yj.dao"/> </bean> </beans>
- 上面的3是死步骤就是Mybatis-spring整合里的，我们以前也经常接触到的，
- 而4 参看这里 https://www.cnblogs.com/yangj-Blog/p/12991861.html
- 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"> <!-- 扫描service相关的bean --> <context:component-scan base-package="com.yj.service" /> <!--BookServiceImpl注入到IOC容器中--> <bean id="BookServiceImpl" class="com.yj.service.BookServiceImpl"> <property name="bookMapper" ref="bookMapper"/> </bean> <!-- 配置事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!-- 注入数据库连接池 --> <property name="dataSource" ref="datasource" /> </bean> </beans>
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"> <!-- 配置SpringMVC --> <!-- 1.开启SpringMVC注解驱动 --> <mvc:annotation-driven /> <!-- 2.静态资源默认servlet配置--> <mvc:default-servlet-handler/> <!-- 3.配置jsp 显示ViewResolver视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <!-- 4.扫描web相关的bean --> <context:component-scan base-package="com.yj.controller" /> </beans>
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"> <import resource="spring-dao.xml"/> <import resource="spring-service.xml"/> <import resource="spring-mvc.xml"/> </beans>
结构
-
com.yang.pojo
-
com.yang.dao
-
com.yang.service
-
com.yang.controller
- （也许还有什么com.yang.Fillter等，但是基本结构如上）
第一步建立与数据库对应的实体类
- Pojo包下的Books
-
package com.yj.pojo; 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; }
第二步 写一些接口去操作实体类即数据库的数据
- dao包下的BookMapper
-
package com.yj.dao; import com.yj.pojo.Books; import org.apache.ibatis.annotations.Param; import java.util.List; public interface BookMapper { int addBook(Books books); //别名 int deleteBook(@Param("bookId") int id); int updateBook(Books books); Books queryBookById(@Param("bookId")int id); List<Books> findAllBook(); }
第三步 有了接口在以前是不是去实现接口写一些Impl之类的，不过现在有MyBatis只需要一个Mapper对应一个接口，（mybatis-config,xml的配置里面）了直接映射写配置文件mapper配置文件，
-
并且该xml不是Mybatis的头部核心配置信息
-
<?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"> - dao包下的BookMapper.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.yj.dao.BookMapper"> <insert id="addBook" parameterType="Books"> insert into ssmbuild.books (bookName,bookCounts,detail) values (#{bookName},#{bookCounts},#{detail}); </insert> <delete id="deleteBook" parameterType="int"> delete from ssmbuild.books where bookID=#{bookId}; </delete> <update id="updateBook" parameterType="Books"> update ssmbuild.books set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail} where bookID=#{bookID} </update> <select id="queryBookById" resultType="Books"> select * from ssmbuild.books where bookID=#{bookId}; </select> <select id="findAllBook" resultType="Books"> select * from ssmbuild.books; </select> </mapper>
- ===============================================
-
但是！！！！！！！！！！！！！！！！！！！！！
- 实际上第三步可以省略，因为可以在第二步接口里面自己用注解支持Mybatis
- 如下面的形式
- @Select(*****)
- List<Books> findAllBook();
- ===============================================
- 第四步（业务层）业务也是和数据库对应的，所以业务也是这些操作
- service包下的BookService
package com.yj.service; import com.yj.pojo.Books; import java.util.List; public interface BookService { int addBook(Books books); int deleteBook(int id); int updateBook(Books books); Books queryBookById(int id); List<Books> findAllBook(); }
第五步业务层的接口实现类
service包下的BookServiceImpl（业务层调用dao层）
package com.yj.service; import com.yj.dao.BookMapper; import com.yj.pojo.Books; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; //@Service public class BookServiceImpl implements BookService{ //service调dao层：组合dao // @Autowired 不需要，自动 private BookMapper bookMapper; public void setBookMapper(BookMapper bookMapper) { this.bookMapper = bookMapper; } public int addBook(Books books) { return bookMapper.addBook(books); } public int deleteBook(int id) { return bookMapper.deleteBook(id); } public int updateBook(Books books) { return bookMapper.updateBook(books); } public Books queryBookById(int id) { return bookMapper.queryBookById(id); } public List<Books> findAllBook() { return bookMapper.findAllBook(); } }
Controller包下的
BookController
package com.yj.controller; import com.yj.pojo.Books; import com.yj.service.BookService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import java.util.List; @Controller @RequestMapping("/book") public class BookController { @Autowired @Qualifier("BookServiceImpl") private BookService bookService; @RequestMapping("/allBook") public String list(Model model) { List<Books> list = bookService.findAllBook(); model.addAttribute("list", list); return "allBook"; } @RequestMapping("/toAddBook") public String toAddPaper() { return "addBook"; } @RequestMapping("/addBook") public String addPaper(Books books) { System.out.println(books); bookService.addBook(books); return "redirect:/book/allBook"; } @RequestMapping("/toUpdateBook") public String toUpdateBook(Model model, int id) { Books books = bookService.queryBookById(id); System.out.println(books); model.addAttribute("book",books ); return "updateBook"; } @RequestMapping("/updateBook") public String updateBook(Model model, Books book) { System.out.println(book); bookService.updateBook(book); Books books = bookService.queryBookById(book.getBookID()); model.addAttribute("books", books); return "redirect:/book/allBook"; } @RequestMapping("/del/{bookId}") public String deleteBook(@PathVariable("bookId") int id) { bookService.deleteBook(id); return "redirect:/book/allBook"; } }