SSM 整合
文章目录
- SSM 整合
-
- 1、基础环境
-
- 1.1、目录结构
- 1.2、 `mybatis-config.xml` 框架
- 1.3、 `applicationContext.xml` 框架
- 1.4、 `jdbc.properties` 框架
- 2、 `MyBatis` 配置
-
- 2.1、数据库 `URL`
- 2.2、配置别名
- 2.3、 `Mapper` 配置
- 3、 `Spring` 配置
-
- 3.1、`spring-dao.xml `
- 3.2、`spring-service.xml`
- 3.3、`spring-mvc.xml`
- 3.4、导入到主配置文件
- 3.5、 `web.xml`
- 4、代码测试
-
- 4.1、 `pojo`
- 4.2、`Dao` 层
- 4.3、 `Service` 层
- 4.4、 `Controller` 层
1、基础环境
新建空白
maven
工程,右键点击 项目->
Add Frameworks Support
->
Java EE
-> 选中
Web Application
(版本需大于等于4.0) ->
OK
1.1、目录结构
1.2、 mybatis-config.xml
框架
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>
1.3、 applicationContext.xml
框架
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"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://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">
</beans>
1.4、 jdbc.properties
框架
jdbc.properties
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=
jdbc.username=
jdbc.password=
2、 MyBatis
配置
MyBatis
2.1、数据库 URL
URL
jdbc:mysql://localhost:3306/school?useUnicode=true&characterEncoding=utf8&useSSL=true&serverTimezone=Asia/Shanghai
若 MySQL
版本大于等于8.0,则需要在连接后加入时区参数。
2.2、配置别名
在文件
mybatis-config.xml
中的
configuration
标签下添加。
<typeAliases>
<package name="com.lxc.pojo"/>
</typeAliases>
2.3、 Mapper
配置
Mapper
在类
UserMapper.java
同级目录中新建文件
UserMapper.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.lxc.dao.UserMapper">
<select id="findAllUser" resultType="user">
select * from user
</select>
<select id="findUser" resultType="user">
select * from user where `id` = #{id}
</select>
</mapper>
3、 Spring
配置
Spring
每一层分别使用一个配置文件进行配置
3.1、 spring-dao.xml
spring-dao.xml
负责
Dao
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
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 导入jdbc配置文件-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 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}"/>
<!--最大连接池数量-->
<property name="maxPoolSize" value="30"/>
<!--最小连接池数量-->
<property name="minPoolSize" value="10"/>
<!--关闭连接后不自动提交-->
<property name="autoCommitOnClose" value="false"/>
<!--获取连接超时时间-->
<property name="checkoutTimeout" value="10000"/>
<!--获取连接失败重试次数-->
<property name="acquireRetryAttempts" value="2"/>
</bean>
<!-- 创建SqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!-- 扫描dao层下的类和mapper-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<property name="basePackage" value="com.lxc.dao"/>
</bean>
</beans>
3.2、 spring-service.xml
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
https://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层-->
<context:component-scan base-package="com.lxc.service"/>
<!-- 创建事务管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
</beans>
3.3、 spring-mvc.xml
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
https://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">
<!--需要扫描的包-->
<context:component-scan base-package="com.lxc.controller"/>
<!--不处理静态资源-->
<mvc:default-servlet-handler/>
<!--注解支持-->
<mvc:annotation-driven>
<!--解决乱码问题-->
<mvc:message-converters register-defaults="true">
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="UTF-8"/>
</bean>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
<property name="failOnEmptyBeans" value="false"/>
</bean>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!-- 视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
3.4、导入到主配置文件
<import resource="classpath:spring-dao.xml"/>
<import resource="classpath:spring-service.xml"/>
<import resource="classpath:spring-mvc.xml"/>
3.5、 web.xml
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">
<servlet>
<servlet-name>dispatcherServlet</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>dispatcherServlet</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>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- session配置-->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
4、代码测试
4.1、 pojo
pojo
User.java
@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class User {
private int id;
private String username;
private String password;
}
4.2、 Dao
层
Dao
UserMapper.java
package com.lxc.dao;
public interface UserMapper {
List<User> findAllUser();
User findUser(int id);
}
UserMapper.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.lxc.dao.UserMapper">
<select id="findAllUser" resultType="user">
select * from user
</select>
<select id="findUser" resultType="user">
select * from user where `id` = #{id}
</select>
</mapper>
4.3、 Service
层
Service
UserService.java
public interface UserService {
List<User> findAllUser();
User findUser(int id);
}
UserServiceImpl.java
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
public List<User> findAllUser() {
return userMapper.findAllUser();
}
public User findUser(int id) {
return userMapper.findUser(id);
}
}
4.4、 Controller
层
Controller
@RestController
@RequestMapping("/hello")
public class HelloController {
@Autowired
private UserService userService;
@RequestMapping("/findall")
public String hello1() throws JsonProcessingException {
List<User> allUser = userService.findAllUser();
return new ObjectMapper().writeValueAsString(allUser);
}
@RequestMapping("/find/{id}")
public String hello2(@PathVariable("id") int id) throws JsonProcessingException {
User user = userService.findUser(id);
return new ObjectMapper().writeValueAsString(user);
}
}
- 结果目录