SSM整合练习
1.新建一个普通的maven项目,在pom.xml中导入ssm项目所需要的所有依赖
<?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>cn.js.ccit</groupId>
<artifactId>ssmbuild</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<!--依赖导入-->
<dependencies>
<!-- 单元测试 junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
<!--数据库驱动 mysql-connector -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.24</version>
</dependency>
<!-- 数据库连接池 c3p0 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.5</version>
</dependency>
<!-- Servlet:servlet支持-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<!-- Jsp:jsp支持 -->
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<!-- jstl 标准标签库 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.1</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>
<!--静态资源导出问题-->
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<!--可以添加其他类型文件-->
<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>
2.使用ide连接数据库
3.建包结构
4.添加配置文件
1.mybatis核心配置文件 mybatis-config.xml 先写头文件
<?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> </configuration>
2.spring核心配置文件 applicationContext.xml 先写头文件
<?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>
数据库配置文件 c3p0.properties
jdbc.driver=com.mysql.cj.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3308/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai jdbc.username=root jdbc.password=admin
<!-- lombok 偷懒插件 --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.12</version> <scope>provided</scope> </dependency>
用法: https://projectlombok.org/features/all
3.补充 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,交给spring去做了,此处不做处理--> <!-- 取别名 cn.js.ccit.pojo包下的类自动取别名--> <typeAliases> <package name="cn.js.ccit.pojo"/> </typeAliases> </configuration>
4.创建实体类
package cn.js.ccit.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @author Vis.Yang
* @project_name
* @date 2022-01-06 15:53
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
private int bookId;
private String bookName;
private int bookCounts;
private String detail;
}
//@Data GET/SET/toString/hash/equals
//@AllArgsConstructor 有参构造
//@NoArgsConstructor 无参构造
4.编写dao层的接口
package cn.js.ccit.dao;
import cn.js.ccit.pojo.Books;
import java.util.List;
/**
* @author Vis.Yang
* @project_name
* @date 2022-01-06 16:15
*/
@SuppressWarnings("ALL")
public interface BookMapper {
//添加书籍
int addBook(Books books);
//删除书籍
int deleteBookById(int id);
//更新一本书
int updateBook(Books books);
//查询一本书
Books queryBookById(int id);
//查询所有书籍
List<Books> queryAllBooks();
}
5.创建一个mapper.xml 实现接口中的方法
<?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="cn.js.ccit.dao.BookMapper">
<insert id="addBook" parameterType="Books">
insert into books (bookName,bookCounts,detail)
values (#{bookName},#{bookCounts},#{detail});
</insert>
<delete id="deleteBookById" parameterType="int">
delete from books where bookID=#{bookID};
</delete>
<update id="updateBook" parameterType="Books">
update books set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail} where bookID=#{bookID};
</update>
<select id="queryBookById" resultType="Books">
select * from books where bookID=#{bookID};
</select>
<select id="queryAllBooks" resultType="Books">
select * from books
</select>
</mapper>
补充 mybatis-config.xml 绑定 刚刚写的mapper
<?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去做了,此处不做处理--> <!-- 取别名 cn.js.ccit.pojo包下的类自动取别名--> <typeAliases> <package name="cn.js.ccit.pojo"/> </typeAliases> <!-- 配置mapper--> <mappers> <!-- 接口与实现mapper同名时可以这样用 --> <!-- <mapper class="cn.js.ccit.dao.BookMapper"></mapper--> <mapper resource="BookMapper.xml"></mapper> </mappers> </configuration>
5.编写服务层接口
package cn.js.ccit.service;
import cn.js.ccit.pojo.Books;
import java.util.List;
/**
* @author Vis.Yang
* @project_name
* @date 2022-01-06 17:04
*/
@SuppressWarnings("ALL")
public interface BookService {
//添加书籍
int addBook(Books books);
//删除书籍
int deleteBookById(int id);
//更新一本书
int updateBook(Books books);
//查询一本书
Books queryBookById(int id);
//查询所有书籍
List<Books> queryAllBooks();
}
6.实现服务层方法 service 调dao
package cn.js.ccit.service;
import cn.js.ccit.dao.BookMapper;
import cn.js.ccit.pojo.Books;
import java.util.List;
/**
* @author Vis.Yang
* @project_name
* @date 2022-01-06 17:05
*/
@SuppressWarnings("ALL")
public class BookServiceImpl implements BookService {
private BookMapper bookMapper;
//有了注解驱动的话就可以使用注解法注入
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
@Override
public int addBook(Books books) {
return bookMapper.addBook(books);
}
@Override
public int deleteBookById(int id) {
return bookMapper.deleteBookById(id);
}
@Override
public int updateBook(Books books) {
return bookMapper.updateBook(books);
}
@Override
public Books queryBookById(int id) {
return bookMapper.queryBookById(id);
}
@Override
public List<Books> queryAllBooks() {
return bookMapper.queryAllBooks();
}
}
7.spring整合mybatis(dao层) 创建 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">
<!-- 关联数据库配置文件-->
<context:property-placeholder location="classpath:c3p0.properties"/>
<!-- 数据库连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<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(配置) -->
<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>
<!-- sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!-- 绑定mybatis配置文件-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!--配置dao接口自动扫描包,动态实现Dao接口注入到Spring中 就不需要手动写实现类,实现接口注入了-->
<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="cn.js.ccit.dao"/>
</bean>
</beans>