SSM簡單整合（Mybatis,Spring,SpringMVC，基於註解和xml文件配置）

SSM簡單整合

1.環境

• JDK1.8
• Eclipse
• Maven構建工具
  

2.依賴包配置（pom.xml）

<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.lyx</groupId>
    <artifactId>ssm_hrs</artifactId>
    <version>1.0</version>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.1</version>
            <scope>provided</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- mybatis的依賴包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>
        <!-- mybatis整合Spring的依賴包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.40</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-dbcp2</artifactId>
            <version>2.1.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.10</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.10.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-orm -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.3.10.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.3.10.RELEASE</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjrt -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.8.10</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.10</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.0</version>
        </dependency>
        <!-- freemarker 模板引擎 -->
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.23</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context-support -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>4.3.10.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.0</version>
        </dependency>
    </dependencies>

    <build>
        <!-- 將類路徑下的.xml加載（默認類路徑是隻加載.java文件的） -->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>
        <plugins>
            <!-- Maven打包插件 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.2.0</version>
                <!-- 即使沒有web.xml文件也不報錯 -->
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
            <!-- Tomcat插件(可以通過服務器插件部署項目) -->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
            </plugin>
            <!-- Maven編譯插件 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <!-- 使用JDK版本 -->
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <packaging>war</packaging>
</project>

3.web.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    id="WebApp_ID" version="3.1">

    <!-- 配置前端控制器（門面模式） -->
    <servlet>
        <servlet-name>frontController</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 指定SpringMVC配置文件的路徑和名字(不配置的話默認WEB-INF目錄下frontController-servlet.xml文件) -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring-config/mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>    <!-- 服務器一啓動就實例化控制器 -->
        <multipart-config />    <!-- 原生的支持文件上傳 -->
    </servlet>
    <servlet-mapping>
        <servlet-name>frontController</servlet-name>
        <url-pattern>/</url-pattern>    <!-- 一定要寫斜槓(所有請求交給前端控制器) -->
    </servlet-mapping>

    <!-- 指定Spring配置文件的路徑 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>  <!-- 名字必須該名字，一字不差 -->
        <param-value>/WEB-INF/spring-config/spring.xml</param-value>    <!-- spring.xml-Spring配置文件的名字 -->
    </context-param>

    <!-- 配置監聽器-服務器一啓動就啓動Spring IoC容器（Spring的IoC容器） -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 配置編碼過濾器 -->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>   <!-- 必須是該名字 -->
            <param-value>utf-8</param-value>
        </init-param>
        <!-- <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>utf-8</param-value>
        </init-param> -->
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- Open Session in view(將Hibernate的Session作用延長到view-視圖渲染完成) -->
    <!-- 反模式-訪問量過大就崩了-最好在業務層組裝DTO -->
    <!-- <filter>
        <filter-name>osiv</filter-name>
        <filter-class>org.springframework.orm.hibernate5.support.OpenSessionInViewFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>osiv</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping> -->

    <!-- 配置發生異常跳轉的頁面 -->
    <!-- <error-page>
        <error-code>404</error-code>
        <location>/404.html</location>
    </error-page> -->
    <!-- 發生錯誤跳轉的頁面 -->
    <!-- <error-page>
        <exception-type>java.lang.Throwable</exception-type>
        <location>/error.jsp</location>
    </error-page> -->

    <display-name>1011house</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

4.SpringMVC的配置文件(mvc.xml)

<?xml version="1.0" encoding="UTF-8"?>
<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
    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">

    <!-- 攔截器 -->
    <!-- <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/toPublish" />
            <mvc:mapping path="/doPublish" />
            <bean class="com.lyx.house.interceptor.LoginInterceptor" />
        </mvc:interceptor>
    </mvc:interceptors> -->

    <!-- 在哪個包以及子包下搜索被@Controller註解標記的控制器 -->
    <context:component-scan base-package="com.lyx.hrs.controller" />

    <!-- 通過註解配置Spring MVC -->
    <mvc:annotation-driven conversion-service="conversionService">
        <mvc:message-converters>
            <!-- 消息轉換器（需要註解@ResponseBody),把返回的東西經過轉換放入迴應的消息體中 -->
            <!-- 將圖片輸出流經過轉換放入迴應的消息體中(需要設置MIME類型-資源的媒體類型) -->
            <bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter" />
            <bean class="org.springframework.http.converter.StringHttpMessageConverter" />
            <!-- 將返回的對象轉換成JSOn數據格式(直接返回對象就好)（底層通過Jackson工具類轉換實現） -->
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
        </mvc:message-converters>
    </mvc:annotation-driven>

    <!-- 配置轉換服務的工廠對象（前端傳過來的有些數據需要轉換成指定格式就需要配置，例如前端給的日期本身是字符串--Date日期格式；一串有規律的字符串--自定義的一個對象） -->
    <bean id="conversionService" 
            class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
        <!-- 指定自定義轉換器 -->
        <property name="converters">
            <set>
                <bean class="com.lyx.hrs.converter.DateConverter" />
            </set>
        </property>
    </bean>

    <!-- 配置使用應用服務器(Tomcat)默認的Servlet處理靜態資源 -->
    <mvc:default-servlet-handler />
    <!-- 爲靜態資源配置資源映射（如上是將全部的靜態資源進行默認處理，這裏是詳細的進行自定義處理） -->
    <!-- <mvc:resources location="/css/**" mapping="/css/**" />
    <mvc:resources location="/images/**" mapping="/image/**"/>
    <mvc:resources location="/js/**" mapping="/js/**" /> -->

    <!-- 配置上傳文件的視圖解析器 -->
    <!-- Servlet 3 - StandardServletMultipartResolver -->
    <!-- Apache Commons FileUpload - CommonsMultipartResolver -->
    <!-- 如果使用Servlet 3原生的文件上傳支持那麼需要在配置DispatcherServlet時指定multipart-config -->
    <!-- 如果使用Apache的Commons-FileUpload那麼需要在依賴項中加入commons-fileupload的jar文件 -->
    <bean class="org.springframework.web.multipart.support.StandardServletMultipartResolver" />

    <!-- 配置JSP的視圖解析器對象 -->
    <!-- <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
        <!-- 視圖解析器的優先級(數值越大，優先級越低) -->
        <property name="order" value="10" />
    </bean> -->

    <!-- freemarker的配置器 -->
    <bean class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
        <property name="templateLoaderPath" value="/WEB-INF/ftl/"/>
        <property name="defaultEncoding" value="utf-8"/>
        <property name="freemarkerSettings">
            <props>
                <prop key="classic_compatible">true</prop>
            </props>
        </property>
    </bean>

    <!-- freemarker的視圖解析器 -->
    <bean class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
        <property name="contentType" value="text/html; charset=utf-8" />
        <property name="cache" value="true"/>
        <property name="prefix" value=""/>
        <property name="suffix" value=".ftl"/>
        <property name="order" value="4"/>
    </bean>

</beans>

5.Spring的配置文件（spring.xml）

<?xml version="1.0" encoding="UTF-8"?>
<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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    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/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- Spring掃包（將打了@Repository，@Service註解的類納入IoC容器進行管理） -->
    <context:component-scan base-package="com.lyx.hrs">
        <!-- 排除掉控制層 -->
        <context:exclude-filter type="annotation"
            expression="org.springframework.stereotype.Controller" />
        <context:exclude-filter type="annotation"
            expression="org.springframework.web.bind.annotation.ControllerAdvice" />
    </context:component-scan>
    <!-- 表示基於註解配置Spring -->
    <context:annotation-config />

    <!-- 配置連接池 DBCP2/C3P0/Druid(該處使用的DBCP2) -->
    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/hrs"></property>
        <property name="username" value="root"></property>
        <property name="password" value="951112"></property>
        <property name="initialSize" value="10"></property>
        <property name="maxTotal" value="100"></property>
        <property name="maxWaitMillis" value="5000"></property>
    </bean>

    <!-- 配置mybatis的SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 指定Mybtis配置文件的路徑和名字 -->
        <property name="configLocation" value="classpath:mybatis-config.xml" />
    </bean>


    <!-- 配置MapperScannerConfigurer對象 -->
    <!-- 該對象將指定包下的Mapper接口自動生成實現類，並納入SpringIoC容器的管理 -->
    <!-- 該配置可以將Mapper對象依賴注入到業務對象中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.lyx.hrs.mapper" />
        <property name="sqlSessionFactoryBeanName" ref="sqlSessionFactory"/>
    </bean>

    <!-- 配置事務管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 配置聲明式事務（打註解-@Transaction-業務層-事務腳本模式） -->
    <tx:annotation-driven transaction-manager="transactionManager" />

    <!-- 自己寫的切面代理(通過自動生成代理) -->
    <!-- <aop:aspectj-autoproxy></aop:aspectj-autoproxy> -->
</beans>

6.Mybatis的配置文件

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 配置類型別名 -->
    <typeAliases>
        <!-- 單獨一個個的配置 -->
        <!-- <typeAlias alias="student" type="com.lyx.mybatis.domain.Student" /> -->
        <!-- 默認把該包下的類名首字母小寫作別名 -->
        <package name="com.lyx.hrs.domain"></package>
    </typeAliases>


    <!-- 映射器 XML文件的位置 -->
    <mappers>
        <!-- 單獨一個個的配置 -->
        <!-- <mapper resource="com/lyx/mybatis/mapper/StudentMapper.xml" /> -->
        <!-- 默認把該包下的配置文件加載進來(映射器的xml文件和接口名字一樣) -->
        <package name="com.lyx.hrs.mapper"></package>
    </mappers>
</configuration>

(5.6)另一種-將Mybatis的配置整合到Spring的配置中

<?xml version="1.0" encoding="UTF-8"?>
<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:mybatis="http://mybatis.org/schema/mybatis-spring"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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://mybatis.org/schema/mybatis-spring
        http://mybatis.org/schema/mybatis-spring.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 配置掃描哪個包及其子包來發現需要納入Spring IoC容器管理的對象 -->
    <!-- Spring掃包（將打了@Repository，@Service註解的類納入IoC容器進行管理） -->
    <context:component-scan base-package="com.lyx.hrms">
        <!-- 排除掉控制層 -->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
        <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice" />
    </context:component-scan>

    <context:annotation-config/>

    <!-- 配置屬性佔位符的處理對象 該對象可以讀取指定的配置文件獲取參數 -->
    <!-- 如果參數值是經過特殊處理的值 那麼就需要繼承該類自定義屬性佔位符處理對象 -->
    <bean class="com.lyx.hrms.util.MyPlaceholderConfigurer">
        <property name="locations" value="classpath:jdbc.properties"/>
    </bean>

    <!-- 配置數據庫連接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <!-- 基本屬性 url、user、password -->
        <property name="url" value="${jdbc_url}" />
        <property name="username" value="${jdbc_user}" />
        <property name="password" value="${jdbc_password}" />
        <!-- 配置初始化大小、最小、最大 -->
        <property name="initialSize" value="1" />
        <property name="minIdle" value="1" />
        <property name="maxActive" value="20" />
        <!-- 配置獲取連接等待超時的時間 -->
        <property name="maxWait" value="3000" />
        <!-- 配置間隔多久才進行一次檢測，檢測需要關閉的空閒連接，單位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000" />
        <!-- 配置一個連接在池中最小生存的時間，單位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="300000" />
        <property name="validationQuery" value="SELECT 'x'" />
        <property name="testWhileIdle" value="true" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />
        <!-- 打開PSCache，並且指定每個連接上PSCache的大小 -->
        <property name="poolPreparedStatements" value="true" />
        <property name="maxPoolPreparedStatementPerConnectionSize" value="20" />
        <!-- 配置監控統計攔截的filters -->
        <property name="filters" value="stat" />
    </bean>

    <!-- 配置mybatis的sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!-- 配置類型別名 -->
        <property name="typeAliasesPackage" value="com.lyx.hrms.domain"/>
        <!-- 配置映射器xml文件 -->
        <property name="mapperLocations" value="classpath*:mapper/*.xml"/>
        <!-- 配置mybatis的類型轉換器 -->
        <property name="typeHandlersPackage" value="com.lyx.hrms.handler"/>
    </bean>

    <!-- 配置mybatis的映射器，將包下的接口自動生成實現類並納入Ioc容器的管理 -->
    <mybatis:scan base-package="com.lyx.hrms.mapper"/>

    <!-- 配置事務管理 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 配置聲明式事務 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

7.接口，接口對應的Mybaits的實現文件(持久層)

Department.java(實體類)

package com.lyx.hrs.domain;

import java.io.Serializable;

/**
 * 部門表
 */
public class Department implements Serializable {
    private static final long serialVersionUID = 1L;

    private Integer no;
    private String name;
    private String location;

    public Department() {
        super();
    }

    public Integer getNo() {
        return no;
    }

    public void setNo(Integer no) {
        this.no = no;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getLocation() {
        return location;
    }

    public void setLocation(String location) {
        this.location = location;
    }

    @Override
    public String toString() {
        return "Department [no=" + no + ", name=" + name + ", location=" + location + "]";
    }
}

Employee.java(實體類)

package com.lyx.hrs.domain;

import java.io.Serializable;
import java.util.Date;

/**
 * 員工類實體
 */
public class Employee implements Serializable{
    private static final long serialVersionUID = 1L;

    private Integer no; //編號
    private String name;//姓名
    private Boolean sex; // true 男
    private String job;   //工作
    private Double salary;  //工資
    private Date hiredate;  //入職時間
    private Boolean status; //是否在職
    private String photoPath;   //頭像
    private String tel;
    private Employee mgr;   //主管(自關聯 多對一)
    private Department dept;    //所在部門 （關聯部門表 多對一）

    public Integer getNo() {
        return no;
    }

    public void setNo(Integer no) {
        this.no = no;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Boolean getSex() {
        return sex;
    }

    public void setSex(Boolean sex) {
        this.sex = sex;
    }

    public String getJob() {
        return job;
    }

    public void setJob(String job) {
        this.job = job;
    }

    public Employee getMgr() {
        return mgr;
    }

    public void setMgr(Employee mgr) {
        this.mgr = mgr;
    }

    public Double getSalary() {
        return salary;
    }

    public void setSalary(Double salary) {
        this.salary = salary;
    }

    public Date getHiredate() {
        return hiredate;
    }

    public void setHiredate(Date hiredate) {
        this.hiredate = hiredate;
    }

    public Boolean getStatus() {
        return status;
    }

    public void setStatus(Boolean status) {
        this.status = status;
    }

    public String getPhotoPath() {
        return photoPath;
    }

    public void setPhotoPath(String photoPath) {
        this.photoPath = photoPath;
    }

    public String getTel() {
        return tel;
    }

    public void setTel(String tel) {
        this.tel = tel;
    }

    public Department getDept() {
        return dept;
    }

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

    public Employee() {
        super();
    }
}

DepartmentMapper.java（接口）

package com.lyx.hrs.mapper;

import java.util.List;

import com.lyx.hrs.domain.Department;

public interface DepartmentMapper{

    int save(Department dept);

    int deleteById(Integer no);

    int update(Department dept);

    Department findById(Integer id);

    List<Department> findAll();

    int countEmpById(Integer no);
}

DepartmentMapper.xml(與Department.java接口對應的Mybatis實現文件,Mybatis會根據該文件生成DepartmentMapper.java的實現類)

<?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">
<!-- 命名空間-對應相應的接口 -->
<mapper namespace="com.lyx.hrs.mapper.DepartmentMapper">

    <!-- 配置實體類與數據庫表的對應關係 -->
    <resultMap type="department" id="departmentResultMap">
        <!-- 實體類屬性名 對應 數據庫列名 -->
        <id property="no" column="dno" />
        <result property="name" column="dname" />
        <result property="location" column="dloc" />
    </resultMap>

    <!-- id對應接口的方法名，paramType對應參數類型，resultType對應返回的數據類型（如int，string），
        若返回的是實體類或容器中裝的是實體類，則resultMap對應實體類 -->
    <insert id="save" parameterType="department">
        insert into tb_dept (dno,dname,dloc)
        values(#{no},#{name},#{location})
    </insert>

    <delete id="deleteById" parameterType="int">
        delete from tb_dept
        where dno=#{no}
    </delete>

    <update id="update" parameterType="department">
        update tb_dept
        <set>
            <if test="name!=null">dname=#{name},</if>
            <if test="location!=null">dloc=#{location},</if>
        </set>
        where dno=#{no}
    </update>

    <select id="findById" resultMap="departmentResultMap" parameterType="int">
        select dno,dname,dloc
        from tb_dept
        where dno=#{no}
    </select>

    <select id="findAll" resultMap="departmentResultMap">
        select dno,dname,dloc
        from tb_dept
    </select>

    <select id="countEmpById" resultType="int">
        select count(1)
        from tb_emp
        where dno=#{no}
    </select>
</mapper>

EmployeeMapper.java(接口)

package com.lyx.hrs.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import com.lyx.hrs.domain.Department;
import com.lyx.hrs.domain.Employee;


/**
 * 員工數據訪問對象接口
 */
public interface EmployeeMapper{

    int save(Employee emp);

    int leaveByNo(Integer no);

    int update(Employee emp);

    Employee findById(Integer no);

    //@Param--多參數時,在Mybatis實現文件中可以使用該註解配置的名字進行佔位
    List<Employee> findByPage(@Param("dept")Department dept,@Param("offset")Integer offset,@Param("pageSize")Integer pageSize);

    int findTotalEmpByDept(Department dept);
}

EmployeetMapper.xml(EmployeeMapper.java接口的Mybatis的實現文件)

<?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">
<!-- 命名空間-對應相應的接口 -->
<mapper namespace="com.lyx.hrs.mapper.EmployeeMapper">

    <!-- 被關聯的 -->
    <resultMap type="department" id="departmentResultMap">
        <!-- 只查詢被關聯的某些列 -->
        <id property="no" column="dno" />
        <result property="name" column="dname" />
        <result property="location" column="dloc" />
    </resultMap>

    <resultMap type="employee" id="mgrResultMap">
        <!-- 因爲自關聯列名一樣，所以（column）進行別名 -->
        <id property="no" column="mgrno" />
        <result property="name" column="mgrname" />
    </resultMap>

    <!-- 配置實體類與數據庫表的對應關係 -->
    <resultMap type="employee" id="employeeResultMap">
        <id property="no" column="eno" />
        <result property="name" column="ename" />
        <result property="sex" column="esex" />
        <result property="job" column="ejob" />
        <result property="salary" column="esal" />
        <result property="hiredate" column="ehiredate" />
        <result property="status" column="estatus" />
        <result property="photoPath" column="ephoto" />
        <result property="tel" column="etel" />
        <!-- 外鍵列的關聯映射(多對一) -->
        <association property="mgr" column="emgr" resultMap="mgrResultMap"/>
        <association property="dept" column="dno" resultMap="departmentResultMap"/>
    </resultMap>

    <insert id="save" parameterType="employee">
        insert into tb_emp
            (eno,ename,esex,ejob,esal,ehiredate,estatus,ephoto,etel,emgr,dno)
        values
            (#{no},#{name},#{sex},#{job},#{salary},#{hiredate},#{status},#{photoPath},#{tel},#{mgr.no},#{dept.no})
    </insert>

    <update id="leaveByNo" parameterType="int">
        update tb_emp
        set estatus=0
        where eno=#{no}
    </update>

    <update id="update" parameterType="employee">
        update tb_emp
        <set>
            <if test="name!=null">ename=#{name},</if>
            <if test="job!=null">ejob=#{job},</if>
            <if test="salary!=null">esal=#{salary},</if>
            <if test="tel!=null">etel=#{tel},</if>
        </set>
        where eno=#{no}
    </update>

    <select id="findById" resultMap="employeeResultMap" parameterType="int">
        <!-- 進行多表查詢 -->
        select t1.eno,t1.ename,t1.esex,t1.ejob,t1.esal,t1.ehiredate,t1.estatus,t1.ephoto,t1.etel,
            t2.eno as mgrno,t2.ename as mgrname,t3.dno,dname,dloc
        from tb_emp as t1
        left outer join tb_emp as t2
            on t1.emgr=t2.eno
        left outer join tb_dept as t3
            on t1.dno=t3.dno
        where t1.eno=#{no}
    </select>

    <select id="findByPage" resultMap="employeeResultMap">
        <!-- 多參數 -->
        select eno,ename,esex,ejob,estatus,etel
        from tb_emp
        where dno=#{dept.no} and estatus=1
        limit #{offset},#{pageSize}
    </select>

    <select id="findTotalEmpByDept" resultType="int" parameterType="department">
        select count(1)
        from tb_emp
        where dno=#{no}
    </select>

</mapper>

8.自定義的轉換器

package com.lyx.hrs.converter;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.core.convert.converter.Converter;

//自定義的轉換器，需要實現 import org.springframework.core.convert.converter.Converter 接口
public class DateConverter implements Converter<String, Date>{

    @Override
    public Date convert(String dateString) {
        if (dateString==null||dateString=="") {
            throw new RuntimeException("入職時間不能爲空");
        } else {
            SimpleDateFormat myFormat = new SimpleDateFormat("yyyy-MM-dd");
            try {
                return myFormat.parse(dateString);
            } catch (ParseException e) {
                throw new RuntimeException("字符串轉日期格式出錯！！！", e);
            }
        }
    }
}

9.雜項

Mybatis調用存儲過程示例

<!-- 調用存儲過程 -->
    <select id="findAvgSalary" statementType="CALLABLE">
        {call sp_getAvgSal(
            #{name,jdbcType=VARCHAR,mode=IN},
            #{avgSal,jdbcType=DOUBLE, mode=OUT}
        )}
    </select>

Mybatis主鍵回顯示例

<!-- 主鍵回顯 -->
    <insert id="save" parameterType="user" useGeneratedKeys="true" keyProperty="id">
        insert into tb_user(username,userpass,email,phone,realname)
        values(#{username},#{password},#{email},#{phone},#{realname})
    </insert>