1. 首先確保在pom.xml中添加spring和mybatis的依賴：

<dependencies>
    <!-- Spring -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.2.5.RELEASE</version>
    </dependency>

    <!-- MyBatis -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.3</version>
    </dependency>
</dependencies>

2. 配置mybatis的SqlSessionFactory和MapperScannerConfigurer：

<!-- MyBatis配置文件 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="configLocation" value="classpath:mybatis-config.xml" />
</bean>

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.example.mapper" />
</bean>

3. 創建MyBatis的映射文件和Mapper接口：

<!-- com/example/mapper/UserMapper.xml -->
<mapper namespace="com.example.mapper.UserMapper">
    <select id="selectUserById" resultType="com.example.model.User">
        SELECT * FROM user WHERE id = #{id}
    </select>

    <insert id="insertUser" parameterType="com.example.model.User">
        INSERT INTO user(name, age) VALUES(#{name}, #{age})
    </insert>

    <!-- 同理，添加update和delete的SQL語句 -->
</mapper>

// com/example/mapper/UserMapper.java
package com.example.mapper;

import com.example.model.User;

public interface UserMapper {
    User selectUserById(int id);
    void insertUser(User user);
    // 添加update和delete的方法
}

4. 創建User類作為實體類：

// com/example/model/User.java
package com.example.model;

public class User {
    private int id;
    private String name;
    private int age;

    // 省略getter和setter方法
}

5. 編寫Service類調用Mapper接口實現增刪改查操作：

// com/example/service/UserService.java
package com.example.service;

import com.example.mapper.UserMapper;
import com.example.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {
    @Autowired
    private UserMapper userMapper;

    public User getUserById(int id) {
        return userMapper.selectUserById(id);
    }

    public void addUser(User user) {
        userMapper.insertUser(user);
    }

    // 添加update和delete的方法
}

至此，就完成了Spring整合MyBatis實現增刪改查操作的基本步驟。通過配置MyBatis的SqlSessionFactory和MapperScannerConfigurer，以及編寫Mapper接口和映射文件，再通過Service類調用Mapper接口實現具體的數據庫操作。