6. Primavera integrada

6. Primavera integrada

MyBatis-Spring te ayudará a integrar sin problemas el código de MyBatis en Spring. Permitirá que MyBatis participe en la gestión de transacciones de Spring, cree mapper mapper y SqlSession e inyéctelos en beans, y convierta las excepciones de Mybatis en DataAccessException de Spring. En última instancia, es posible hacer que el código de la aplicación sea independiente de MyBatis, Spring o MyBatis-Spring.

documento oficial

repositorio de código fuente

Ejemplo de integración oficial

6.1 Integrar Spring: importar todos los paquetes jar necesarios

pom.xml

<!-- DB连接池 -->
<dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.5</version>
</dependency>

<!-- JSP -->
<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>jstl</artifactId>
	<version>1.2</version>
</dependency>

<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>javax.servlet-api</artifactId>
	<version>3.1.0</version>
	<scope>provided</scope>
</dependency>

<dependency>
	<groupId>javax.servlet.jsp</groupId>
	<artifactId>jsp-api</artifactId>
	<version>2.1</version>
	<scope>provided</scope>
</dependency>

<!-- 用于整合Spring -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>${springframework.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>${springframework.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>${springframework.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-tx</artifactId>
    <version>${springframework.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-orm</artifactId>
    <version>${springframework.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aop</artifactId>
    <version>${springframework.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aspects</artifactId>
    <version>${springframework.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>${springframework.version}</version>
    <scope>test</scope>
</dependency>

6.2 Integrar Spring - configuración antes de introducir MyBatis

mybatis-config.xml

<configuration>
	<settings>
		<setting name="mapUnderscoreToCamelCase" value="true"/>
		<!--显示的指定每个我们需要更改的配置的值，即使他是默认的。防止版本更新带来的问题  -->
		<setting name="lazyLoadingEnabled" value="true"/>
		<setting name="aggressiveLazyLoading" value="false"/>
		<setting name="cacheEnabled" value="true"/>
	</settings>
</configuration>

---

EmpleadoMapper.xml

<mapper namespace="club.coderhome.c06.spring.EmployeeMapper">

 	<select id="getEmpById" resultType="club.coderhome.c01.helloworld.bean.Employee">
		select * from employee where id = #{id}
	</select>
	
 	<select id="getEmps" resultType="club.coderhome.c01.helloworld.bean.Employee">
		select * from employee
	</select>
</mapper>

---

Asignador de empleados

public interface EmployeeMapper {
    
    

	public Employee getEmpById(Integer id);

	public List<Employee> getEmps();
	
}
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6.3 Integrar la escritura del archivo de configuración Spring-SpringMVC

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app ...>
  <!--Spring配置： needed for ContextLoaderListener -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:applicationContext.xml</param-value>
	</context-param>

	<!-- Bootstraps the root web application context before servlet initialization -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	
	<!-- SpringMVC配置 -->
	<!-- The front controller of this Spring Web application, responsible for handling all application requests -->
	<servlet>
		<servlet-name>spring</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<!-- Map all requests to the DispatcherServlet for handling -->
	<servlet-mapping>
		<servlet-name>spring</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
  
</web-app>

---

primavera-servlet.xml

<beans ...">

	<!--SpringMVC只是控制网站跳转逻辑  -->
	<!-- 只扫描控制器 -->
	<context:component-scan base-package="club.coderhome.c06" use-default-filters="false">
		<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
	</context:component-scan>
	
	<!-- 视图解析器 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/pages/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
	<mvc:annotation-driven></mvc:annotation-driven>
	<mvc:default-servlet-handler/>
</beans>

6.4 Integrar la escritura del archivo de configuración Spring-Spring

applicationContext.xml

<beans ...>

	<!-- Spring希望管理所有的业务逻辑组件，等。。。 -->
	<context:component-scan base-package="club.coderhome.c06">
		<context:exclude-filter type="annotation"
			expression="org.springframework.stereotype.Controller" />
	</context:component-scan>

	<!-- 引入数据库的配置文件 -->
	<context:property-placeholder location="classpath:c04/dbconfig.properties" />
	<!-- Spring用来控制业务逻辑。数据源、事务控制、aop -->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="jdbcUrl" value="${jdbc.url}"></property>
		<property name="driverClass" value="${jdbc.driver}"></property>
		<property name="user" value="${jdbc.username}"></property>
		<property name="password" value="${jdbc.password}"></property>
	</bean>
	<!-- spring事务管理 -->
	<bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource"></property>
	</bean>

	<!-- 开启基于注解的事务 -->
	<tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
	...

6.5 Integrar Spring-Spring Integrar configuración de teclas MyBatis

applicationContext.xml

	...
	<!-- 
	整合mybatis 
		目的：1、spring管理所有组件。mapper的实现类。
				service==>Dao   @Autowired:自动注入mapper；
			2、spring用来管理事务，spring声明式事务
	-->
	<!--创建出SqlSessionFactory对象  -->
	<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource"></property>
		<!-- configLocation指定全局配置文件的位置 -->
		<property name="configLocation" value="classpath:c06/mybatis-config.xml"></property>
		<!--mapperLocations: 指定mapper文件的位置-->
		<property name="mapperLocations" value="classpath:c06/*Mapper.xml"></property>
	</bean>
	
	<!--配置一个可以进行批量执行的sqlSession  -->
	<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
		<constructor-arg name="sqlSessionFactory" ref="sqlSessionFactoryBean"></constructor-arg>
		<constructor-arg name="executorType" value="BATCH"></constructor-arg>
	</bean>
	
	<!-- 扫描所有的mapper接口的实现，让这些mapper能够自动注入；
	base-package：指定mapper接口的包名
	 -->
	<mybatis-spring:scan base-package="club.coderhome.c06"/>
	<!-- <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="club.coderhome.dao"></property>
	</bean> -->
	
</beans>

6.6 Integración de las pruebas de integración de Spring

EmployeeController.java

@Controller
public class EmployeeController implements Serializable{
    
    

	private static final long serialVersionUID = -5415910268862124882L;
	
	@Autowired
	EmployeeService employeeService;
	
	@RequestMapping("/getemps")
	public String emps(Map<String,Object> map){
    
    
		List<Employee> emps = employeeService.getEmps();
		map.put("allEmps", emps);
		return "list";
	}
}

---

EmployeeService.java

@Service
public class EmployeeService {
    
    

	@Autowired
	private EmployeeMapper employeeMapper;
	
	@Autowired
	private SqlSession sqlSession;
	
	public List<Employee> getEmps(){
    
    
		//
		//EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
		return employeeMapper.getEmps();
	}

}

---

lista.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>员工列表</title>
</head>
<body>
	<table>
			<tr>
				<td>id</td>
				<td>lastName</td>
				<td>email</td>
				<td>gender</td>
			</tr>
		<c:forEach items="${allEmps}" var="emp">
			<tr>
				<td>${emp.id}</td>
				<td>${emp.lastName}</td>
				<td>${emp.email}</td>
				<td>${emp.gender}</td>
			</tr>
		</c:forEach>
	
	</table>

</body>
</html>

---

http://localhost:8080/mybatis/getempsFinalmente, prueba escribiendo en el navegador