springMVC整合mybatis框架的项目起始配置
写在前面：项目出现的问题：
①xml格式缩进要严格，不然会报红
②配置项目结构，新建lib包带入所有依赖jar
③配置Tomcat添加本项目
④database.properties文件配置每行后面不要留空格，鼠标点进去可以看到是否有空格
⑤dao层数据库传进参数parametertype与返回参数resulttype不要弄混
⑥负责扫描进bean的过程放在applicationContext.xml里面，然后记得web.xml中的classpath:applicationContext
指向applicationContext.xml
1、数据库搭建
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');
2、环境搭建
<dependencies> <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>8.0.21</version> </dependency> <!--数据库连接池--> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.3</version> </dependency> <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>2.2.1-b03</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>3.5.5</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.5</version> </dependency> <!--spring--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.7.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.2.8.RELEASE</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.12</version> </dependency> </dependencies> <!--静态资源导出问题--> <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>
3、项目结构框架
3.1 mybatis-config.xml （配置文件都是新建）
<?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>
3.2 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
4.1 database.properties
jdbc.driver=com.mysql.cj.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?serverTimezone=Asia/Shanghai&useSSL=true&useUnicode=true&characterEncoding=utf8 jdbc.username=root jdbc.password=123456
4.2 关联数据库
4.3 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> <typeAliases> <package name="com.meng.pojo" </typeAliases> <mappers> <mapper class="com.meng.dao.BookMapper"/> </mappers> </configuration>
4.4 数据库实体类 com.meng.pojo.Books
package com.meng.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; }
4.5 接口com.meng.dao.BookMapper
package com.meng.dao; import com.meng.pojo.Books; import org.apache.ibatis.annotations.Param; import java.util.List; public interface BookMapper { int addBook(Books books); //@Param用于传递参数，从而可以与SQL中的的字段名相对应 int deleteBookById(@Param("bookId") int id); int updataBook(Books books); int queryBookById(@Param("bookId") int id); List<Books> queryAllBook(); }
4.6 持久层dao下的BookMapper对应的xxxMapper.xml文件
<?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.meng.dao.BookMapper">
<insert id="addBook" parameterType="Books">
insert into books(bookName,bookCounts,detail) value (#{bookName},#{bookCounts},#{detail})
</insert>
<delete id="deleteBookById" parameterType="int" >
delete from books where bookID=#{bookId}
</delete>
<update id="updataBook" parameterType="Books">
update books set bookName = #{bookName},bookCounts = #{bookCount},detail = #{detail} where bookID=#{bookID}
</update>
<select id="queryBookById" parameterType="Books">
select * from books where bookID = #{bookID}
</select>
<select id="queryAllBook" resultType="Books">
SELECT * FROM books
</select>
</mapper>
4.7 service层接口和实现类
接口
package com.meng.service; import com.meng.pojo.Books; import org.springframework.stereotype.Service; import java.util.List; @Service public interface BookService { int addBook(Books books); int deleteBookById( int id); int updataBook(Books books); int queryBookById(int id); List<Books> queryAllBook(); }
实现类package com.meng.service;import com.meng.dao.BookMapper;
package com.meng.service;
import com.meng.dao.BookMapper;
import com.meng.pojo.Books;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.List;
public class BookServiceImpl implements BookService{
@Autowired
//service层调用dao层：组合dao层
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 updataBook(Books books) {
return bookMapper.updataBook(books);
}
public int queryBookById(int id) {
return bookMapper.queryBookById(id);
}
public List<Books> queryAllBook() {
return bookMapper.queryAllBook();
}
}
5、spring层配置
5.1 spring整合mybatis（数据源使用c3p0连接池，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 -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 给出需要扫描Dao接口包 -->
<property name="basePackage" value="com.meng.dao"/>
</bean>
</beans>
5.2 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 https://www.springframework.org/schema/context/spring-context.xsd">
<!-- 扫描service相关的bean -->
<context:component-scan base-package="com.meng.service" />
<!--BookServiceImpl注入到IOC容器中-->
<bean id="BookServiceImpl" class="com.meng.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>
6、springMVC层
6.1 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:mvc="http://www.springframework.org/schema/mvc" 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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <!--注解驱动--> <mvc:annotation-driven/> <!--静态资源过滤--> <mvc:default-servlet-handler/> <!--扫描包--> <context:component-scan base-package="com.meng.controller"/> <!--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>
6.2 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">
<!--DispatchService-->
<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:applicationContext.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-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
6.3 application.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>
