Spring+SpringMVC+MyBatis框架整合开发笔记,以下为SSM框架的简单案例代码及开发流程
配置pom.xml,通过Maven注入SSM需要的相关依赖
<dependencies>
<!--Junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
<scope>test</scope>
</dependency>
<!--数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.25</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相关-->
<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相关-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.9</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.6</version>
</dependency>
<!--Spring相关-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.14</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.3.14</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.7</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.3.14</version>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.22</version>
</dependency>
</dependencies>
加上xml文件资源过滤,防止xml静态资源无法读取
<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>
配置完成pom.xml后,根据数据库编写相应的实体类就行了,如下使用lombok注解简化
@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class User{
private int id;
private String username;
}
DAO层
首先根据需求开发DAO层的接口,这里我简单的编写了一些常用的增删查改操作。
public interface UserMapper {
int addUser(User user);
//@Param("id")需与实体类和数据库中的字段相同
int deleteUserById(@Param("id") int id);
int updateUser(User user);
User queryUserById(@Param("id") int id);
User queryUserByName(@Param("username") String username);
List<User> queryAllUsers();
}
编写其实现类
//这里继承SqlSessionDaoSupport实现sqlSessionFactory注入
public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper {
@Override
public int addUser(User user) {
return getSqlSession().getMapper(UserMapper.class).addUser(user);
}
//...
}
编写MyBatis的mapper.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">
<!--命名空间设为对应的mapper接口-->
<mapper namespace="com.project.dao.UserMapper">
<!--其中#{id},#{username}就是从Mapper中对应函数的参数获取的-->
<insert id="addUser" parameterType="User">
insert into User (id,username)
values (#{id},#{username});
</insert>
<!--..........-->
<!--这里使用CONCAT拼接SQL语句实现模糊查询-->
<select id="queryUserByName" resultType="User">
select *
from User where username like CONCAT(CONCAT('%',#{username}),'%');
</select>
</mapper>
配置database.properties数据库配置文件
#MySQL 8.0以上使用com.mysql.cj.jdbc.Driver,以下则使用com.mysql.jdbc.Driver
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/project?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
jdbc.username=root
jdbc.password=123456
配置MyBatis配置文件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>
<!--配置别名-->
<package name="com.project.pojo"/>
</typeAliases>
<!--绑定Mapper,mapper路径为resources/dao层对应的包名路径-->
<mappers>
<mapper class="com.project.dao.UserMapper"/>
</mappers>
</configuration>
配置DAO层的配置文件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
http://www.springframework.org/schema/context/spring-context.xsd">
<!--数据库配置,路径指向database.properties-->
<context:property-placeholder location="classpath:database.properties"/>
<!--配置数据源,这里使用c3p0-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!--对应database.properties的配置-->
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!--配置c3p0连接池大小-->
<property name="maxPoolSize" value="30"/>
<property name="minPoolSize" value="10"/>
<!--关闭连接后不自动提交-->
<property name="autoCommitOnClose" value="false"/>
<!--连接超时时间设为10秒-->
<property name="checkoutTimeout" value="10000"/>
<!--连接失败重试次数为2次-->
<property name="acquireRetryAttempts" value="2"/>
</bean>
<!--SqlSessionFactory配置-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--数据源指向前面配置的dataSource-->
<property name="dataSource" ref="dataSource"/>
<!--绑定Mybatis的配置文件-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!--将UserMapper注册到Spring-->
<bean id="UserMapper" class="com.project.dao.UserMapperImpl">
<!--注入sqlSessionFactory-->
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
</beans>
Service层
先编写service层接口及其实现类,调用Dao层即可
@Service
public class UserServiceImpl implements UserService{
private UserMapper userMapper;
//Spring通过set注入mapper
public void setUserMapper(UserMapper userMapper) {
this.userMapper = userMapper;
}
@Override
public int addUser(User user) {
return userMapper.addUser(user);
}
//........
}
配置Service层配置文件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"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
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
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
https://www.springframework.org/schema/aop/spring-aop.xsd">
<!--扫描Service包下的Service组件-->
<context:component-scan base-package="com.project.service"/>
<!--配置事务-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!--注入数据源-->
<property name="dataSource" ref="dataSource"/>
</bean>
<!--注册service的bean-->
<bean id="UserServiceImpl" class="com.project.service.UserServiceImpl">
<!--SET注入Mapper-->
<property name="UserMapper" ref="UserMapper"/>
</bean>
</beans>
Controller层
编写controller, 首先注入service对象,然后根据需求编写需要的请求
@Controller
public class UserController {
//自动装载service对象
@Autowired
@Qualifier("UserServiceImpl")
private UserService userService;
//请求路径
@RequestMapping("/allUsers")
public String getAllUsers(Model model){
//调用service层,返回值通过Model传给前端
model.addAttribute("allUsers",userService.queryAllUsers());
//返回视图名给视图解析器
return "allUsers";
}
//........
}
配置spring-controller.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
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--扫描包-->
<context:component-scan base-package="com.project.controller"/>
<!--静态资源过滤-->
<mvc:default-servlet-handler/>
<!--注解驱动-->
<mvc:annotation-driven/>
<!--视图解析器-->
<bean id="InternalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
整合三层架构配置文件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-controller.xml"/>
<import resource="spring-service.xml"/>
<import resource="spring-dao.xml"/>
</beans>
配置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">
<!--配置DispatcherServlet-->
<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>
<!--配置乱码过滤器-->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>