您的位置: 首页  >  文章  >  mybatis学习笔记（九）- Spring 整合

mybatis学习笔记（九）- Spring 整合

分类: 文章 • 2024-05-08 10:00:46

1. 整合 Spring _ 整合适配包下载

  1. 查看不同MyBatis版本整合Spring时使用的适配包
    http://www.mybatis.org/spring/
  2. 下载整合适配包
    https://github.com/mybatis/spring/releases
    mybatis学习笔记（九）- Spring 整合
  3. 官方整合示例，jpetstore
    https://github.com/mybatis/jpetstore-6

最终工程目录如下

mybatis学习笔记（九）- Spring 整合

2. 整合 Spring 所需的 jar 包导入

mybatis学习笔记（九）- Spring 整合

3. 引入 mybatis 之前的配置文件

1. 新建一个动态 web 工程 MyBatis_06_ssm

2. 创建配置包 conf，在包下创建 mybatis-config.xml 和 dbconfig.properties

mybatis-config.xml
<settings>
	<setting name="mapUnderscoreToCamelCase" value="true"/>
	<setting name="jdbcTypeForNull" value="NULL"/>
	
	<!--显式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="cacheEnabled" value="true"/>
	<setting name="lazyLoadingEnabled" value="true"/>
	<setting name="aggressiveLazyLoading" value="false"/>
</settings>

<databaseIdProvider type="DB_VENDOR">
	<property name="MySQL" value="mysql"/>
	<property name="Oracle" value="oracle"/>
	<property name="SQL Server" value="sqlserver"/>
</databaseIdProvider>
dbconfig.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=123456

4. 创建 bean 包和 dao 包，下面分别建立 Employee、Department 实体类和 EmployeeMappper 接口

Employee
package www.xq.mybatis.bean;

import java.io.Serializable;

public class Employee implements Serializable{
	
	private Integer id;
	private String lastName;
	private String email;
	private String gender;
	private Department dept;
	
	public Employee() {
		super();
	}
	
	public Employee(Integer id, String lastName, String email, String gender, Department dept) {
		super();
		this.id = id;
		this.lastName = lastName;
		this.email = email;
		this.gender = gender;
		this.dept = dept;
	}

	public Employee(Integer id, String lastName, String email, String gender) {
		super();
		this.id = id;
		this.lastName = lastName;
		this.email = email;
		this.gender = gender;
	}
	
	
	

	public Department getDept() {
		return dept;
	}

	public void setDept(Department dept) {
		this.dept = dept;
	}

	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getLastName() {
		return lastName;
	}
	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	@Override
	public String toString() {
		return "Employee [id=" + id + ", lastName=" + lastName + ", email="
				+ email + ", gender=" + gender + "]";
	}
}
Department
package www.xq.mybatis.bean;

import java.io.Serializable;
import java.util.List;

public class Department implements Serializable {
	
	private Integer id;
	private String departmentName;
	private List<Employee> emps;
	
	public Department(Integer id) {
		super();
		this.id = id;
	}
	public List<Employee> getEmps() {
		return emps;
	}
	public void setEmps(List<Employee> emps) {
		this.emps = emps;
	}
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getDepartmentName() {
		return departmentName;
	}
	public void setDepartmentName(String departmentName) {
		this.departmentName = departmentName;
	}
	@Override
	public String toString() {
		return "Department [id=" + id + ", departmentName=" + departmentName
				+ "]";
	}
}

5. 在 conf 下创建映射文件包 mybatis.mapper 并创建 EmployeeMapper.xml 映射文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="www.xq.mybatis.dao.EmployeeMapper">

</mapper>

4. SpringMVC 配置文件的书写

1. web.xml 文件的设计

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>MyBatis_06_ssm</display-name>
	
	<!--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>

2. 在 web.xml 同级目录上创建 spring-servlet.xml SpringMVC 配置文件

命名空间勾选 beans、context、mvc
	<!--SpringMVC只是控制网站跳转逻辑  -->
	<!-- 只扫描控制器 -->
	<context:component-scan base-package="www.xq.mybatis" 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/page/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
	<!-- 处理一些动态资源 -->
	<mvc:annotation-driven></mvc:annotation-driven>
	<!-- 处理一些静态资源 -->
	<mvc:default-servlet-handler/>

5. Spring 配置文件的书写

在 conf 包下创建 spring 配置文件 applicationContext.xml，命名空间勾选beans、context、mybatis-spring、tx
<!-- Spring希望管理所有的业务逻辑组件，等。。。 -->
<context:component-scan base-package="com.atguigu.mybatis">
	<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: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. MyBatis 关键配置

在 Spring 配置文件 applicationContext.xml 中加入
<!-- 
	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:mybatis-config.xml"></property>
		<!--mapperLocations: 指定mapper文件的位置-->
		<property name="mapperLocations" value="classpath:mybatis/mapper/*.xml"></property>
	</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="www.xq.mybatis.dao"/>

7. 测试

1. 创建 index.jsp

    <a href="getemps">查询所有员工</a>

2. 创建 EmployeeController 控制器

@Controller
public class EmployeeController {

	@Autowired
	EmployeeService employeeService;

	@RequestMapping("/getemps")
	public String emps(Map<String, Object> map) {
		List<Employee> emps = employeeService.getEmps();
		map.put("allEmps", emps);
		return "list";
	}
}

3. 创建 EmployeeService 查询所有员工

@Service
public class EmployeeService {
	
	@Autowired
	private EmployeeMapper employeeMapper;
	
	public List<Employee> getEmps(){
		return employeeMapper.getEmps();
	}

}

4. 在 dao 接口 EmployeeMapper 中创建查询方法

public interface EmployeeMapper {
	public List<Employee> getEmps();
}

5. 在 EmployeeMapper.xml 映射文件中实现方法

<mapper namespace="www.xq.mybatis.dao.EmployeeMapper">
	<!--public List<Employee> getEmps();  -->
	<select id="getEmps" resultType="www.xq.mybatis.bean.Employee">
		select * from tbl_employee
	</select>
</mapper>

6. 在 page 文件夹下创建视图文件 list.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>

7. 运行结果

mybatis学习笔记（九）- Spring 整合

mybatis学习笔记（九）- Spring 整合

相关推荐