springBoot集成mybatis+mysql项目搭建

左手的ㄟ右手 2022-04-14 02:44 323阅读 0赞

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：

![70][]

2.创建项目的文件结构以及jdk的版本

![70 1][]

3.选择项目所需要的依赖

![70 2][]

选择持久化框架的依赖

![70 3][]

然后点击finish

5.项目结构如下：

![70 4][]

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/> 
        </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>
                
                <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/chenyun01
            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chenyun01，新建数据表userInfo，插入2条数据，结构如下

![70 5][]  
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>
        
        <classPathEntry  location="D:\dataSourceDriver\mysql-connector-java-5.1.6-bin.jar"/>
        <context id="DB2Tables"  targetRuntime="MyBatis3">
            <commentGenerator>
                <property name="suppressDate" value="true"/>
                
                <property name="suppressAllComments" value="false"/>
            </commentGenerator>
            
            <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/chenyun01" userId="root" password="root">
            </jdbcConnection>
            <javaTypeResolver>
                <property name="forceBigDecimals" value="false"/>
            </javaTypeResolver>
            
            <javaModelGenerator targetPackage="com.ocean.pojo" targetProject="src">
                <property name="enableSubPackages" value="true"/>
                <property name="trimStrings" value="true"/>
            </javaModelGenerator>
            
            <sqlMapGenerator targetPackage="resources.mapping" targetProject="src">
                <property name="enableSubPackages" value="true"/>
            </sqlMapGenerator>
            
            <javaClientGenerator type="XMLMAPPER" targetPackage="com.ocean.dao" targetProject="src">
                <property name="enableSubPackages" value="true"/>
            </javaClientGenerator>
            
            <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![70 6][]

添加配置

![70 7][]

运行

![70 8][]

最后生成的项目结构：

![70 9][]

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：

![70 10][]

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

![70 11][]  
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）：

![70 12][]

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">
        
        <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">
        
        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">
        
        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>
      
      <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：

![70 13][]

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）

![70 14][]

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！！

![70 15][]

源码地址：[https://github.com/guobinhui/javaWeb-project/tree/master/springboot-mybatis-demo][https_github.com_guobinhui_javaWeb-project_tree_master_springboot-mybatis-demo]  
\---------------------   
作者：guobinhui   
来源：CSDN   
原文：https://blog.csdn.net/guobinhui/article/details/79289189   
版权声明：本文为博主原创文章，转载请附上博文链接！

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[https_github.com_guobinhui_javaWeb-project_tree_master_springboot-mybatis-demo]: https://github.com/guobinhui/javaWeb-project/tree/master/springboot-mybatis-demo