從0整合SSM（Spring + SpringMVC + Mybatis）
阿新 • • 發佈：2021-06-29
1. 整合策略
SSM = Spring + SpringMVC + Mybatis = （Spring + Mybatis）+ SpringMVC
先整合 Spring + Mybatis
然後再整合 SpringMVC
新建web專案
2. Mybatis整合Spring
整合目標：
- 資料庫連線池以及事務管理都交給Spring容器來完成
- SqlSessionFactory物件應該放到Spring容器中作為單例物件管理
- Mapper動態代理物件交給Spring管理，我們從Spring容器中直接獲得Mapper的代理物件
整合後的 Pom 座標
<?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>com.lagou.edu</groupId> <artifactId>ssm</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>ssm Maven Webapp</name> <!-- FIXME change it to the project's website --> <url>http://www.example.com</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>11</maven.compiler.source> <maven.compiler.target>11</maven.compiler.target> </properties> <dependencies> <!--junit--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <!--mybatis--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.5</version> </dependency> <!--spring相關--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.1.12.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>5.1.12.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.1.12.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.1.12.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>5.1.12.RELEASE</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.9</version> </dependency> <!--mybatis與spring的整合包--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.3</version> </dependency> <!--資料庫驅動jar--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version> </dependency> <!--druid連線池--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.21</version> </dependency> <!--SpringMVC--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.1.12.RELEASE</version> </dependency> <!--jsp-api&servlet-api--> <dependency> <groupId>javax.servlet</groupId> <artifactId>jsp-api</artifactId> <version>2.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> <!--頁面使用jstl表示式--> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <!--json資料互動所需jar，start--> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>2.9.0</version> </dependency> <!--json資料互動所需jar，end--> </dependencies> <build> <plugins> <!--tomcat外掛--> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.2</version> <configuration> <port>8080</port> <path>/</path> </configuration> </plugin> </plugins> </build> </project>
- jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/bank
jdbc.username=root
jdbc.password=123456
- Spring 配置檔案
applicationContext-dao.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd "> <!--包掃描--> <context:component-scan base-package="com.lagou.edu.mapper"/> <!--資料庫連線池以及事務管理都交給Spring容器來完成--> <!--引入外部資原始檔--> <context:property-placeholder location="classpath:jdbc.properties"/> <!--第三方jar中的bean定義在xml中--> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> <!--SqlSessionFactory物件應該放到Spring容器中作為單例物件管理 原來mybaits中sqlSessionFactory的構建是需要素材的：SqlMapConfig.xml中的內容 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--別名對映掃描--> <property name="typeAliasesPackage" value="com.lagou.edu.pojo"/> <!--資料來源dataSource--> <property name="dataSource" ref="dataSource"/> </bean> <!--Mapper動態代理物件交給Spring管理，我們從Spring容器中直接獲得Mapper的代理物件--> <!--掃描mapper介面，生成代理物件，生成的代理物件會儲存在ioc容器中--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!--mapper介面包路徑配置--> <property name="basePackage" value="com.lagou.edu.mapper"/> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> </bean> </beans>
applicationContext-service.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd "> <!--包掃描--> <context:component-scan base-package="com.lagou.edu.service"/> <!--事務管理--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> <!--事務管理註解驅動--> <tx:annotation-driven transaction-manager="transactionManager"/> </beans>
- AccountMapper接⼝
public interface AccountMapper {
// 定義dao層介面方法--> 查詢account表所有資料
List<Account> queryAccountList() throws Exception;
}
- AccountService和AccountServiceImpl
//AccountServiceImpl
@Service
@Transactional
public class AccountServiceImpl implements AccountService {
@Autowired
private AccountMapper accountMapper;
@Override
public List<Account> queryAccountList() throws Exception {
return accountMapper.queryAccountList();
}
}
//AccountService
public interface AccountService {
List<Account> queryAccountList() throws Exception;
}
- AccountMapper.xml
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.lagou.edu.mapper.AccountMapper">
<select id="queryAccountList" resultType="com.lagou.edu.pojo.Account">
select * from account
</select>
</mapper>
3. 整合SpringMVC
- springmvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
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
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
">
<!--掃描controller-->
<context:component-scan base-package="com.lagou.edu.controller"/>
<!--配置springmvc註解驅動，自動註冊合適的元件handlerMapping和handlerAdapter-->
<mvc:annotation-driven/>
</beans>
- Controller類
@Controller
@RequestMapping("/account")
public class AccountController {
/**
* Spring容器和SpringMVC容器是有層次的（父子容器）
* Spring容器：service物件+dao物件
* SpringMVC容器：controller物件，，，，可以引用到Spring容器中的物件
*/
@Autowired
private AccountService accountService;
@RequestMapping("/queryAll")
@ResponseBody
public List<Account> queryAll() throws Exception {
return accountService.queryAccountList();
}
}
- web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext*.xml</param-value>
</context-param>
<!--spring框架啟動-->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--springmvc啟動-->
<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*:springmvc.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>
</web-app>