Mybatis——SSM

目录结构

1、相关依赖

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring</artifactId>
        <version>2.5.6</version>
    </dependency>
    <!--spring IOC-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.0.2.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>4.3.16.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>4.3.14.RELEASE</version>
    </dependency>

    <!--jdbc-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>4.3.16.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>4.3.16.RELEASE</version>
    </dependency>
    <!--web-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>4.3.16.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.3.16.RELEASE</version>
    </dependency>
    <!--aop-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>4.3.16.RELEASE</version>
    </dependency>

    <!--日志-->
    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
        <version>1.2</version>
    </dependency>
    <!--JSTL-->
    <dependency>
        <groupId>jstl</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    <!--数据库驱动-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>6.0.6</version>
    </dependency>
    <!--mybatis-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.4.5</version>
    </dependency>
    <!--mybatis-spring-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.1</version>
    </dependency>
    <!--测试-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>
</dependencies>

2、配置mybatis配置文件

mybatis-config.xml、mapper.xml、dbConfig.properties

3、配置spring配置文件

在web.xml中做出spring的配置

<!--Spring配置-->
<context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:applicationContext.xml</param-value>
</context-param>

并新建spring配置文件

在web.xml中配置前端控制器

<!--前端控制器-->
<!--springMVC配置-->
<servlet>
  <servlet-name>spring</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
    <param-name>spring</param-name>
    <param-value>/</param-value>
  </init-param>
</servlet>

在WEB-INFO下创建spring-servlet.xml

在其中配置上

<!--自动扫描所有文件-->
<!--只扫描控制器-->
<context:component-scan base-package="bean" 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/>

配置applicationContext.xml

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

<!--引入数据库配置文件-->
<context:property-placeholder location="classpath:dbConfig.properties"/>
<!--Spring用来控制业务逻辑。数据源、事物控制、aop-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="jdbcUrl" value="${jdbc.driver}"/>
    <property name="driverClass" value="${jdbc.url}"/>
    <property name="user" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
</bean>

<!--spring事物管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
</bean>

<!--开启基于注解的事物-->
<tx:annotation-driven transaction-manager="transactionManager"/>
<!--
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
          2、spring管理事物，spring声明式事物
-->
<!--创建出SqlSessionFactoryBean对象-->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <!--指定mybatis全局配置文件的位置-->
    <property name="configLocation" value="classpath:mybatis-config.xml"/>
    <!--指定mapper配置文件的位置-->
    <property name="mapperLocations" value="classpath:mapper/*.xml"/>
</bean>

<!--
扫描所有的mapper接口，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="dao"/>

编辑controller层和service层以及页面

@Service
public class EmployeeService {
    @Autowired
    private EmployeeMapper mapper;

    public List<Employee> getEmps(){
        return mapper.getEmps();
    }

}

@Controller
public class EmployeeController {
    @Autowired
    EmployeeService employeeService;

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

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <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>

<html>
<body>
<h2>Hello World!</h2>
<a href="getEmps">查询所有员工</a>
</body>
</html>