最全面的springBoot集成mybatis+mysql项目搭建经验分享

程序员文章站 2022-05-26 08:47:35

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大家都知道，现在Spring框架几乎无处不用，目前最新版本据说是Spring5，现在常用的基本还是Spring4.X，很多公司甚至用的还是Spring3.x，而Spring领域其中最好用的莫过于SpringBoot，这是从SpringMVC衍变出来的，本质还是SpringMVC，但是要比SpringMVC好用的多，因为很好用，所以笔者闲暇之际用SpringBoot从头至尾摸索着搭建了一个案例，分享出来，希望对感兴趣的朋友有所帮助。废话不说了，进入主题，直接分享案例搭建全流程。

本项目使用的环境：

开发工具：Intellij IDEA 2017.1.3
jdk：1.8.0_51
maven:3.5.2

额外功能

mybatis generator 自动生成代码插件

步骤：

1.创建一个springboot项目：
2.创建项目的文件结构以及jdk的版本
3.选择项目所需要的依赖
选择持久化框架的依赖
然后点击finish
5.项目结构如下：
6.查看文件pom.xml：

<?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">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.ocean</groupId>
	<artifactId>springboot-mybatis-demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>springboot-mybatis-demo</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.10.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.1</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.6</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
			    <groupId>org.springframework.boot</groupId>
			    <artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<!-- mybatis generator 自动生成代码插件 -->
			<plugin>
				<groupId>org.mybatis.generator</groupId>
				<artifactId>mybatis-generator-maven-plugin</artifactId>
				<version>1.3.1</version>
				<configuration>
					<configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
					<overwrite>true</overwrite>
					<verbose>true</verbose>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

7.本案例不使用application.properties文件而使用更加简洁的application.yml文件。将resource文件夹下原有的application.properties文件删除，创建application.yml配置文件（备注：其实SpringBoot底层会把application.yml文件解析为application.properties），文件的内容如下(此处只配置最基本的)：

server:
  port: 8080

spring:
    datasource:
        name: test
        url: jdbc:mysql://127.0.0.1:3306/*01
        username: root
        password: root
        driver-class-name: com.mysql.jdbc.Driver
mybatis:
  mapper-locations: classpath:mapping/*Mapper.xml
  type-aliases-package: com.ocean.pojo

8.创建数据库：
在mysql（此处用SQLyog客户端）下创建数据库*01，新建数据表userInfo，插入2条数据，结构如下
9.配置mybatis generator 自动生成代码插件
配置pom.xml中generator 插件所对应的配置文件 ${basedir}/src/main/resources/generator/generatorConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
    <classPathEntry  location="D:\dataSourceDriver\mysql-connector-java-5.1.6-bin.jar"/>
    <context id="DB2Tables"  targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="false"/>
        </commentGenerator>
        <!--数据库连接驱动类,URL，用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/*01" userId="root" password="root">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成(实体)模型的包名和位置-->
        <javaModelGenerator targetPackage="com.ocean.pojo" targetProject="src">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成XML映射文件的包名和位置-->
        <sqlMapGenerator targetPackage="resources.mapping" targetProject="src">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- 生成DAO接口的包名和位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.ocean.dao" targetProject="src">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
        <table tableName="userInfo" domainObjectName="UserInfo" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>

自动生成代码：点击run----> Edit Configurations
添加配置
运行
最后生成的项目结构：
10.我们还需要修改有点东西，因为生成的类中的路径写了全路径，所以我们要把前面多余的（main.java.）删掉：

生成的接口文件UserMapper.java

package com.ocean.dao;
import  com.ocean.pojo.UserInfo;

import java.util.List;

public interface UserInfoMapper {
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table userinfo
     *
     * @mbggenerated
     */
    int insert(UserInfo record);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table userInfo
     *
     * @mbggenerated
     */
    int insertSelective(com.ocean.pojo.UserInfo record);
    //这个方式我自己单独加的方法
    List findAllUser();
}

模型(POJO)UserInfo.java

package com.ocean.pojo;

public class UserInfo {
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column userinfo.userId
     *
     * @mbggenerated
     */
    private Integer userid;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column userinfo.userName
     *
     * @mbggenerated
     */
    private String username;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column userinfo.phone
     *
     * @mbggenerated
     */
    private String phone;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column userinfo.sex
     *
     * @mbggenerated
     */
    private String sex;

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column userinfo.userId
     *
     * @return the value of userinfo.userId
     *
     * @mbggenerated
     */
    public Integer getUserid() {
        return userid;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column userinfo.userId
     *
     * @param userid the value for userinfo.userId
     *
     * @mbggenerated
     */
    public void setUserid(Integer userid) {
        this.userid = userid;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column userinfo.userName
     *
     * @return the value of userinfo.userName
     *
     * @mbggenerated
     */
    public String getUsername() {
        return username;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column userinfo.userName
     *
     * @param username the value for userinfo.userName
     *
     * @mbggenerated
     */
    public void setUsername(String username) {
        this.username = username == null ? null : username.trim();
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column userinfo.phone
     *
     * @return the value of userinfo.phone
     *
     * @mbggenerated
     */
    public String getPhone() {
        return phone;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column userinfo.phone
     *
     * @param phone the value for userinfo.phone
     *
     * @mbggenerated
     */
    public void setPhone(String phone) {
        this.phone = phone == null ? null : phone.trim();
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column userinfo.sex
     *
     * @return the value of userinfo.sex
     *
     * @mbggenerated
     */
    public String getSex() {
        return sex;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column userinfo.sex
     *
     * @param sex the value for userinfo.sex
     *
     * @mbggenerated
     */
    public void setSex(String sex) {
        this.sex = sex == null ? null : sex.trim();
    }
}

对于映射文件UserInfoMapper.xml,删除多余的“main.java.”字符，配置xml的namespace

如果有的人的xml里的sql语句有黄色的背景，真心看不下去时（解决方案按照下图）：

UserMapper.xml

<?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.ocean.dao.UserInfoMapper">
  <resultMap id="BaseResultMap" type="com.ocean.pojo.UserInfo">
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    <result column="userId" jdbcType="INTEGER" property="userid" />
    <result column="userName" jdbcType="VARCHAR" property="username" />
    <result column="phone" jdbcType="VARCHAR" property="phone" />
    <result column="sex" jdbcType="VARCHAR" property="sex" />
  </resultMap>
  <insert id="insert" parameterType="com.ocean.pojo.UserInfo">
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    insert into userinfo (userId, userName, phone,
      sex)
    values (#{userid,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{phone,jdbcType=VARCHAR},
      #{sex,jdbcType=VARCHAR})
  </insert>
  <insert id="insertSelective" parameterType="com.ocean.pojo.UserInfo">
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    insert into userinfo
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="userid != null">
        userId,
      </if>
      <if test="username != null">
        userName,
      </if>
      <if test="phone != null">
        phone,
      </if>
      <if test="sex != null">
        sex,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="userid != null">
        #{userid,jdbcType=INTEGER},
      </if>
      <if test="username != null">
        #{username,jdbcType=VARCHAR},
      </if>
      <if test="phone != null">
        #{phone,jdbcType=VARCHAR},
      </if>
      <if test="sex != null">
        #{sex,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <!--我自己加的方法-->
  <select id="findAllUser" resultType="com.ocean.pojo.UserInfo">
    select * from USERINFO
  </select>
</mapper>

11.打开类SpringbootMybatisDemoApplication.java，这个是springboot的启动类。我们需要添加点东西：

package com.ocean.springbootmybatisdemo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
import org.springframework.boot.web.servlet.ErrorPage;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.http.HttpStatus;

@SpringBootApplication
@MapperScan("com.ocean.dao")
@ComponentScan(basePackages = {"com.ocean.*"})
public class SpringbootMybatisDemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringbootMybatisDemoApplication.class, args);
	}
}

12.到这里本案例的搭建工作都完成了，接下来就是直接在浏览器上测试：
首先看一下完成之后的文件的结构：

现在把controller，service层的代码都写好(因做演示，此处控制器只写了一个方法)：UserController.java

package com.ocean.controller;

import com.ocean.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping(value = {"/user"})
public class UserController {

    @Autowired
    private IUserService userService;

    @RequestMapping(value = {"/findAll"},produces = {"application/json;charset=UTF-8"},method = RequestMethod.GET)
    public List getAllUsers(){
       List list =  userService.findAllUser();
       return list;
    }
}

IUserService.java

package com.ocean.service;

import java.util.List;

public interface IUserService {
    List findAllUser();
}

UserServiceImpl.java

package com.ocean.service.impl;

import com.ocean.dao.UserInfoMapper;
import com.ocean.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service(value = "userService")
public class UserServiceImpl implements IUserService {

    @Autowired
    private UserInfoMapper userDao;//这里可能会报错，但是并不会影响

    @Override
    public List findAllUser(){
       return  userDao.findAllUser();
    }
}

如果强迫症看不下去上面那个报错：（解决方法）

直接在浏览器访问，返回的数据确实是表里插入的2条数据，说明项目已经搭建成功了！！
源码地址：https://github.com/guobinhui/javaWeb-project/tree/master/springboot-mybatis-demo

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