SSM 整合 Spring+Spring MVC+MyBatis
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
<configuration>
configuration>
1.3、 applicationContext.xml 框架
<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.driver=com.mysql.cj.jdbc.Driver
jdbc.url=
jdbc.username=
jdbc.password=
2、 MyBatis 配置
2.1、数据库 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
在类 UserMapper.java 同级目录中新建文件 UserMapper.xml 。
<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
每一层分别使用一个配置文件进行配置
3.1、spring-dao.xml
负责 Dao 层
<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">
<context:property-placeholder location="classpath:jdbc.properties"/>
<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}"/>
<property name="maxPoolSize" value="30"/>
<property name="minPoolSize" value="10"/>
<property name="autoCommitOnClose" value="false"/>
<property name="checkoutTimeout" value="10000"/>
<property name="acquireRetryAttempts" value="2"/>
bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation" value="classpath:mybatis-config.xml"/>
bean>
<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
<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">
<context:component-scan base-package="com.lxc.service"/>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
bean>
beans>
3.3、spring-mvc.xml
<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">
<context:component-scan base-package="com.lxc.controller"/>
<mvc:default-servlet-handler/>
<mvc:annotation-driven>
<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>
<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-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>dispatcherServletservlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
<init-param>
<param-name>contextConfigLocationparam-name>
<param-value>classpath:applicationContext.xmlparam-value>
init-param>
<load-on-startup>1load-on-startup>
servlet>
<servlet-mapping>
<servlet-name>dispatcherServletservlet-name>
<url-pattern>/url-pattern>
servlet-mapping>
<filter>
<filter-name>encodingFilterfilter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
filter>
<filter-mapping>
<filter-name>encodingFilterfilter-name>
<url-pattern>/*url-pattern>
filter-mapping>
<session-config>
<session-timeout>15session-timeout>
session-config>
web-app>
4、代码测试
4.1、 pojo
User.java
@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class User {
private int id;
private String username;
private String password;
}
4.2、Dao 层
UserMapper.java
package com.lxc.dao;
public interface UserMapper {
List<User> findAllUser();
User findUser(int id);
}
UserMapper.xml
<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
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
@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
