基于IDEA采用springboot+Mybatis搭建ssm框架简单demo项目的搭建配置流程

一、通过对比可以原始SSM搭建流程，spring boot省去了大量的配置，极大提高了开发者的效率。原始SSM框架搭建流程见博客：

https://www.cnblogs.com/No2-explorer/p/10993868.html

二、下面开展springboot的快速入门之旅吧！

1、创建数据库和em_info（示例员工信息表格）

DROP TABLE IF EXISTS `em_info`;
CREATE TABLE `em_info` (
    `em_id` INT(50) NOT NULL AUTO_INCREMENT COMMENT '员工ID',
    `em_name` VARCHAR(100) NOT NULL COMMENT '员工姓名',
    `em_sex` VARCHAR(30) NOT NULL COMMENT '性别',
    `em_birthday` DATE NOT NULL COMMENT '出生日期',
    `em_hiredate` DATE NOT NULL COMMENT '入职日期',
    `em_salary` DOUBLE NOT NULL COMMENT '工资',
    PRIMARY KEY (`em_id`)

)ENGINE=INNODB DEFAULT CHARSET=utf8mb4;

INSERT INTO `em_info` VALUES (NULL,'小李飞刀','男','1999-2-8','2019-6-6','9999');

2、通过spring Initializr创建springboot

选择web、Template Engines、SQL的选项见上图右侧

配置完成后，生成下图相关文件

3、sources包下默认配置文件application.properties，可以根据个人喜好删除application.properties后，更改application.yml配置文件

编写yml配置：（主要是数据库相关配置）

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.232.128:3306/ssm
    username: root
    password: root

4、

分别创建controller、service、mapper三层架构，编写相关接口和实现类，pojo类。如下图：

4.1controller层

/**
 * Em_infoController class
 *
 * @author fzj
 * @date 2019/6/9
 */

@RestController    //@RestContller返回json格式不能用于页面提取数据，如果需要返回数据给页面则使用@Controller注释
@RequestMapping("/em_info")
public class Em_infoController {

    @Autowired
    private IEm_infoService em_infoService;

    @RequestMapping("/findAll.do")
    public List<Em_info> findAll() throws Exception{
        List<Em_info> em_infoList = em_infoService.findAll();

        return em_infoList;
    }

}

4.2、Service层没有业务逻辑，直接接口和实现类调用方法即可。

public interface IEm_infoService {
     List<Em_info> findAll() throws Exception;
}

　　service实现类

@Service
public class Em_infoServiceImpl implements IEm_infoService{

    @Autowired
    private IEm_infoMapper em_infoMapper;
    @Override
    public List<Em_info> findAll() throws Exception {
        return em_infoMapper.findAll();
    }
}

　4.3、mapper层接口　

public interface IEm_infoMapper {

    @Select("select * from em_info")
    List<Em_info> findAll() throws Exception;
}

　　

4.4、Pojo类：

package com.fzj.springboot_ssm.pojo;

import org.springframework.context.annotation.Bean;

import java.util.Date;

/**
 * Em_info class
 *
 * @author fzj
 * @date 2019/6/9
 */

public class Em_info {
    private Integer em_id;
    private String em_name;
    private String em_sex;
    private Date em_birthday;
    private Date em_hiredate;
    private Double em_salary;

    public Integer getEm_id() {
        return em_id;
    }

    public void setEm_id(Integer em_id) {
        this.em_id = em_id;
    }

    public String getEm_name() {
        return em_name;
    }

    public void setEm_name(String em_name) {
        this.em_name = em_name;
    }

    public String getEm_sex() {
        return em_sex;
    }

    public void setEm_sex(String em_sex) {
        this.em_sex = em_sex;
    }

    public Date getEm_birthday() {
        return em_birthday;
    }

    public void setEm_birthday(Date em_birthday) {
        this.em_birthday = em_birthday;
    }

    public Date getEm_hiredate() {
        return em_hiredate;
    }

    public void setEm_hiredate(Date em_hiredate) {
        this.em_hiredate = em_hiredate;
    }

    public Double getEm_salary() {
        return em_salary;
    }

    public void setEm_salary(Double em_salary) {
        this.em_salary = em_salary;
    }

    @Override
    public String toString() {
        return "Em_info{" +
                "em_id=" + em_id +
                ", em_name='" + em_name + '\'' +
                ", em_sex='" + em_sex + '\'' +
                ", em_birthday=" + em_birthday +
                ", em_hiredate=" + em_hiredate +
                ", em_salary=" + em_salary +
                '}';
    }
}

　　5、最后一把尤其关键，需要在springbooot启动类添加注解，否则springboot扫描不到mapper包

6、到此，项目已经配置完成！

点击IDEA绿色小三角形，运行项目，浏览器输入访问路径http://localhost:8080/em_info/findAll.do

7、

页面就显示json格式返回结果：

Sqlyog查询结果对比