1.首先创建一个工程

点击“File”->New Project

 2.添加pom依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.45</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>3.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

3.配置application.properties文件

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mybatis?useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=x5

mybatis.mapper-locations=classpath:mapper/*.xml

4.在java文件夹下创建controller、dao、pojo、service，在resources资源文件夹下建mapper文件夹，并创建CustomerMapper.xml文件

项目结构为

5.编写CustomerController

package com.hxci.hyc.controller;

import com.hxci.hyc.pojo.Customer;
import com.hxci.hyc.service.CustomerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class CustomerController {
    @Autowired
    CustomerService service;

    @RequestMapping("query")
    public List<Customer> query(Customer customer、){
        List<Customer> list=service.query(customer);
        return list;
    }
    @RequestMapping("add")
    public String add(Customer customer) {
        service.add(customer);
        return null;
    }
}

6.在Customer创建实体类对象

package com.hxci.hyc.pojo;

public class Customer {
    private Integer id;
    private String sname;
    private String jobs;
    private String phone;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public String getJobs() {
        return jobs;
    }

    public void setJobs(String jobs) {
        this.jobs = jobs;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }



}

7.编写CustomerService

package com.hxci.hyc.service;

import com.hxci.hyc.pojo.Customer;

import java.util.List;

public interface CustomerService {
    public List<Customer> query(Customer customer);
    public void add(Customer customer);
}

8.编写CustomerServiceImpl实现类

package com.hxci.hyc.service;

import com.hxci.hyc.dao.CustomerDao;
import com.hxci.hyc.pojo.Customer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class CustomerServiceImpl implements CustomerService{

    @Autowired
    CustomerDao dao;
    public List<Customer> query(Customer customer){
    
        return dao.query(customer);
    }

    @Override
    public void add(Customer customer) {
         dao.add(customer);
    }
}

9.编写dao层接口

package com.hxci.hyc.dao;

import com.hxci.hyc.pojo.Customer;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface CustomerDao {
    public List<Customer> query(@Param("customer") Customer customer);
    public void add(Customer customer);
}

10.编写dao层对应的mapper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="com.hxci.hyc.dao.CustomerDao">
    <select id="query" resultType="com.hxci.hyc.pojo.Customer">
        select * from customer where 1=1
        <if test="customer.sname != null and customer.sname !=''">
           and sname=#{customer.sname}
        </if>
        <if test="customer.jobs != null and customer.jobs !=''">
           and  jobs=#{customer.jobs}
        </if>
    </select>
    <insert id="add">
        insert into customer (sname,jobs,phone) values(#{sname},#{jobs},#{phone})
    </insert>



</mapper>

11.在Postman上输入http://localhost:8080/query进行查询