SpringBoot集成SSM，实现增删改查功能

一.先介绍创建模块的另一种方式

1.点击Maven -> 勾选Create from archetype -> 选择 maven-archetype-quickstart

快速创建

快速创建

快速创建

有时会需要点击 自动导入

快速创建

2.工程目录

可以看到，这样创建的模块是相对干净的，需要我们手动的编写程序启动入口类、需要配置时还得创建配置文件。下一步见证。

目录

3.完善模块

添加依赖，这种脚架添加模块不会自动引入相关依赖。这里主要引入父级版本号和spring-boot-starter依赖。

<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>

<parent>

  <groupId>org.springframework.boot</groupId>

  <artifactId>spring-boot-starter-parent</artifactId>

  <version>2.2.2.RELEASE</version>

  <relativePath/> <!-- lookup parent from repository -->

</parent>

<groupId>xyz.java1024</groupId>

<artifactId>springboot-ssm</artifactId>

<version>1.0-SNAPSHOT</version>

<name>springboot-ssm</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>1.8</maven.compiler.source>

  <maven.compiler.target>1.8</maven.compiler.target>

  <java.version>1.8</java.version>

</properties>

<dependencies>

  <dependency>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-web</artifactId>

  </dependency>

  <dependency>

    <groupId>junit</groupId>

    <artifactId>junit</artifactId>

    <version>4.11</version>

    <scope>test</scope>

  </dependency>

</dependencies>

</project>

修改启动类，添加注解和修改main启动方法

@SpringBootApplication

public class App

{

    public static void main( String[] args )

    {

        SpringApplication.run(App.class,args);

    }

}

添加配置文件，先添加resouces文件夹，在创建application.yml配置文件。

创建配置

创建配置

细心的同学可以发现 resources 图标没有 黄色的横线

创建配置

点击上图，进入如图，选择Modules -> 选中模块， 接着选中resources再点击Mark as 中 带黄色横线的Resources即可，点击ok

创建配置

创建配置

创建配置

同时可见 yml后缀的配置文件的图标也发生了改变

创建配置

下面我们开始配置文件，yml 提供更加简洁的编程方式，可读性也极高。如下，配置端口号 和 应用名称。

server:

  port: 8090

spring:

  application:

    name: springboot-ssm

4 改造完成，启动入口类查看效果。

启动日志

二.SpringBoot 集成SSM

1.引入依赖 connector,druid,mybatis

<!-- mysql mybatis -->

    <dependency>

      <groupId>mysql</groupId>

      <artifactId>mysql-connector-java</artifactId>

      <version>8.0.13</version>

    </dependency>

    <dependency>

      <groupId>com.alibaba</groupId>

      <artifactId>druid</artifactId>

      <version>1.1.18</version>

    </dependency>

    <dependency>

      <groupId>org.mybatis.spring.boot</groupId>

      <artifactId>mybatis-spring-boot-starter</artifactId>

      <version>1.3.2</version>

    </dependency>

2.创建数据库 表

CREATE TABLE user(

    id int (11) NOT NULL AUTO_INCREMENT,

username varchar(64) NOT NULL,

tel VARCHAR(16) NOT NULL,

password VARCHAR(250) NOT NULL,

status TINYINT NOT NULL default 1,

    created_at timestamp not null default CURRENT_TIMESTAMP ,

    updated_at timestamp not null default CURRENT_TIMESTAMP ,

    PRIMARY KEY (id)

) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

package xyz.java1024.vo;

import java.io.Serializable;

import java.sql.Timestamp;

public class User implements Serializable {

    private int id;

    private String username;

    private String tel;

    private String password;

    private int status;

    private Timestamp createdAt;

    private Timestamp updatedAt;

    //get set省略

3.配置

server:

  port: 8090

# 扫描mapper.xml文件

mybatis:

  mapper-locations:

    - classpath:mapping/*.xml

spring:

  application:

    name: springboot-ssm

  datasource:

    type: com.alibaba.druid.pool.DruidDataSource

    driver-class-name: com.mysql.cj.jdbc.Driver

    url: jdbc:mysql://127.0.0.1:3306/springboot?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8&useSSL=false

    username: root

    password: 123zxc

3.mapper接口，在mapper包下创建UserMapper接口

package xyz.java1024.mapper;

import xyz.java1024.vo.User;

import java.util.List;

public interface UserMapper {

    int deleteByPrimaryKey(Integer id);

    int insert(User record);

    User selectByPrimaryKey(Integer id);

    User selectByUsername(String username);

    int updateByPrimaryKey(User record);

    List<User> list();

}

4.在resources文件夹下创建mapping目录用来存放mapper.xml文件,创建UserMapper.xml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="xyz.java1024.mapper.UserMapper">

  <resultMap id="BaseResultMap" type="xyz.java1024.vo.User">

    <!--@mbg.generated-->

    <id column="id" jdbcType="INTEGER" property="id" />

    <result column="username" jdbcType="VARCHAR" property="username" />

    <result column="tel" jdbcType="VARCHAR" property="tel" />

    <result column="password" jdbcType="VARCHAR" property="password" />

    <result column="status" jdbcType="TINYINT" property="status" />

    <result column="created_at" jdbcType="TIMESTAMP" property="createdAt" />

    <result column="updated_at" jdbcType="TIMESTAMP" property="updatedAt" />

  </resultMap>

  <sql id="Base_Column_List">

    <!--@mbg.generated-->

    id, username, tel, `password`, `status`, created_at, updated_at

  </sql>

  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">

    <!--@mbg.generated-->

    select

    <include refid="Base_Column_List" />

    from user

    where id = #{id,jdbcType=INTEGER}

  </select>

  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">

    <!--@mbg.generated-->

    delete from user

    where id = #{id,jdbcType=INTEGER}

  </delete>

  <insert id="insert" keyColumn="id" keyProperty="id" parameterType="xyz.java1024.vo.User" useGeneratedKeys="true">

    <!--@mbg.generated-->

    insert into user (username, tel, `password`,

      `status`, created_at, updated_at

      )

    values (#{username,jdbcType=VARCHAR}, #{tel,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},

      #{status,jdbcType=TINYINT},  #{createdAt,jdbcType=TIMESTAMP}, #{updatedAt,jdbcType=TIMESTAMP}

      )

  </insert>

  <update id="updateByPrimaryKey" parameterType="xyz.java1024.vo.User">

    <!--@mbg.generated-->

    update user

    set username = #{username,jdbcType=VARCHAR},

      tel = #{tel,jdbcType=VARCHAR},

      `password` = #{password,jdbcType=VARCHAR},

      `status` = #{status,jdbcType=TINYINT},

      created_at = #{createdAt,jdbcType=TIMESTAMP},

      updated_at = #{updatedAt,jdbcType=TIMESTAMP}

    where id = #{id,jdbcType=INTEGER}

  </update>

  <select id="list" resultMap="BaseResultMap" >

    select

    <include refid="Base_Column_List" />

    from user

  </select>

5.扫描mapper接口，即在启动类加@MapperScan注解

@SpringBootApplication

@MapperScan("xyz.java1024.mapper")

public class App

{

    public static void main( String[] args )

    {

        SpringApplication.run(App.class,args);

    }

}

6.编写UserController，省略service

@RestController

@RequestMapping("/user")

public class UserController {

    @Autowired

    private UserMapper userMapper;

    @RequestMapping("/listByUser")

    public List<User> listByUser() {

        return userMapper.list();

    }

    @RequestMapping("/getOneUser")

    public User getOneUser(int id) {

        return userMapper.selectByPrimaryKey(id);

    }

    @RequestMapping("/addUser")

    public int addUser(User user) {

        return userMapper.insert(user);

    }

    @RequestMapping("/deleteUser")

    public int deleteUser(int id) {

        return userMapper.deleteByPrimaryKey(id);

    }

}

7.启动工程测试，浏览器输入localhost:8090/user/getOneUser?id=1

测试

四.总结

体验完SpringBoot 的SSM后，比Spring下的SSM的确是方便的太多，不仅省去了复杂的各种依赖，在配置方面也极大的得到简化，这也是SpringBoot精妙之处。

注意：@MapperScan("")是扫描mapper接口，而

mybatis:

mapper-locations:

- classpath:mapping/*.xml

是配置mapper.xml文件