spring+mybatic整合开发的基本步骤

1.根据需求划分模块（Dao、Service、Controller）：

 2.通过maven引入相关的jar包依赖：

service模块的pom：

<?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">
    <parent>
        <artifactId>spring_emp</artifactId>
        <groupId>com.yzy</groupId>
        <version>1.0-SNAPSHOT</version>

    </parent>
    <modelVersion>4.0.0</modelVersion>
    <packaging>jar</packaging>
    <artifactId>spring_emp_service</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.2.5.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.2.5.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.5.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.5.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.19</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.4</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.4</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.2.5.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.5</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>
    </dependencies>
</project>

web模块的pom文件：

<?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">
  <parent>
    <artifactId>spring_emp</artifactId>
    <groupId>com.yzy</groupId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>

  <artifactId>spring_emp_web</artifactId>
  <packaging>war</packaging>

  <name>spring_emp_web 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>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
    </dependency>
    <dependency>
      <artifactId>spring_emp_service</artifactId>
      <groupId>com.yzy</groupId>
      <version>1.0-SNAPSHOT</version>
    </dependency>
  </dependencies>

  <build>
    <finalName>spring_emp_web</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

3.编写spring配置文件：

<?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:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <!-- Spring整合Mybatis -->
<!--   配置数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/emp?serverTimezone=UTC"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>
    <!-- 配置会话工厂 -->
    <bean name="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="typeAliasesPackage" value="com.yzy.entity"></property>
    </bean>
    <!-- 配置mybatis的mapper配置文件存放的地方 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.yzy.Dao"></property>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
    <!-- 配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!-- 配置advice，管理事务的行为 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="search*" read-only="true"/>
            <tx:method name="find*" read-only="true"/>
            <tx:method name="get*" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>
    <!-- 配置切面，以及advice使用的对象 -->
    <aop:config>
        <aop:pointcut id="txPointCut" expression="execution(* com.yzy.serice.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>
    <!-- 开启spring的注解ioc包扫描 -->
    <context:component-scan base-package="com.yzy"></context:component-scan>
    <!-- 自动代理，当代理的对象没有继承接口是，使用cglib代理，否则默认jdk自动代理（需继承接口） -->
    <aop:aspectj-autoproxy proxy-target-class="true"/>
</beans>

4.创建实体类：

 5.编写dao接口以及mapper配置文件：

package com.yzy.Dao;


import com.yzy.entity.department;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository("departmentDao")
public interface departmentDao {
    void add(department dep);
    void update(department dep);
    void delete(Integer id);
    List<department> selectAll();
    department selectById(Integer id);
}

mapper配置文件：

<?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">
<!--配置命名空间，需和dao接口一致-->
<mapper namespace="com.yzy.Dao.departmentDao">
<!--    配置结果集，将数据库的表与实体类对应-->
    <resultMap id="resultMap" type="department">
        <id property="id" column="id" javaType="Integer"></id>
        <result property="name" column="name" javaType="String"></result>
        <result property="address" column="address" javaType="String"></result>
    </resultMap>
<!--    配置sql语句，id需与dao接口的方法名一一对应-->
    <insert id="add" useGeneratedKeys="true" parameterType="department">
        insert department(name,address) value(#{name},#{address})
    </insert>
    <update id="update" parameterType="department">
        update department set name=#{name},address=#{address} where id=#{id}
    </update>
    <delete id="delete" parameterType="Integer">
        delete from department where id =#{id}
    </delete>
    <select id="selectAll" resultMap="resultMap">
        select * from department
    </select>
    <select id="selectById" parameterType="Integer" resultMap="resultMap">
        select * from department where id =#{id}
    </select>
</mapper>

6.编写service：

package com.yzy.serice.impl;


import com.yzy.Dao.departmentDao;
import com.yzy.entity.department;
import com.yzy.serice.DepartmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;
@Service("departmentService")
public class departmentServiceImpl implements DepartmentService{

   @Autowired
    private departmentDao dao;


    public void add(department dep) {
        dao.add(dep);
    }

    public void edit(department dep) {
        dao.update(dep);
    }

    public void remove(Integer id) {
        dao.delete(id);
    }

    public department get(Integer id) {
        return dao.selectById(id);
    }

    public List<department> getAll() {
        return dao.selectAll();
    }
}

7.编写controller：

package com.yzy.controller;

import com.yzy.entity.department;
import com.yzy.serice.DepartmentService;
import com.yzy.serice.impl.departmentServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@Controller("departmentController")
public class departmentController {
    @Autowired
    private DepartmentService departmentService;
    public void list(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<department> all = departmentService.getAll();
        request.setAttribute("LIST",all);
        request.getRequestDispatcher("/department_list.jsp").forward(request,response);
    }
}

8.编写一个servlet来解析url，将对应的请求交给相应的controller：

package com.yzy.global;

import com.yzy.controller.departmentController;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;


public class dispatcherServlet extends HttpServlet {
    private ApplicationContext context;

    @Override
    public void init() throws ServletException {
        super.init();
        context=new ClassPathXmlApplicationContext("application.xml");
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String path = request.getServletPath().substring(1);
        int index=path.indexOf("/");
        String beanName=null;
        String methodName=null;
        if(index!=-1){
            beanName=path.substring(0,index)+"Controller";
            methodName=path.substring(index+1,path.indexOf(".do"));
        }else{
            beanName="selfController";
            methodName=path.substring(0,path.indexOf(".do"));
        }
         Object obj = context.getBean(beanName);
        //通过反射来调用相应的controller的方法
        try {
            Method method = obj.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            method.invoke(obj,request,response);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
    }
}

<!-- Spring整合Mybatis -->