最全面的springBoot集成mybatis+mysql项目搭建经验分享

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：

• 
  
  	4.0.0
  
  	com.ocean
  	springboot-mybatis-demo
  	0.0.1-SNAPSHOT
  	jar
  
  	springboot-mybatis-demo
  	Demo project for Spring Boot
  
  	
  		org.springframework.boot
  		spring-boot-starter-parent
  		1.5.10.RELEASE
  		 
  	
  
  	
  		UTF-8
  		UTF-8
  		1.8
  	
  
  	
  		
  			org.springframework.boot
  			spring-boot-starter-jdbc
  		
  		
  			org.mybatis.spring.boot
  			mybatis-spring-boot-starter
  			1.3.1
  		
  		
  			org.springframework.boot
  			spring-boot-starter-web
  		
  
  		
  			mysql
  			mysql-connector-java
  			5.1.6
  		
  		
  			org.springframework.boot
  			spring-boot-starter-test
  			test
  		
  	
  
  	
  		
  			
  			    org.springframework.boot
  			    spring-boot-maven-plugin
  			
  			
  			
  				org.mybatis.generator
  				mybatis-generator-maven-plugin
  				1.3.1
  				
  					${basedir}/src/main/resources/generator/generatorConfig.xml
  					true
  					true
  				
  			
  		
  	
  
  

  
  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
• 
   
• 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

•  
  • 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

    
    
    
      
        
        
        
        
        
      
      
        
        insert into userinfo (userId, userName, phone,
          sex)
        values (#{userid,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{phone,jdbcType=VARCHAR},
          #{sex,jdbcType=VARCHAR})
      
      
        
        insert into userinfo
        
          
            userId,
          
          
            userName,
          
          
            phone,
          
          
            sex,
          
        
        
          
            #{userid,jdbcType=INTEGER},
          
          
            #{username,jdbcType=VARCHAR},
          
          
            #{phone,jdbcType=VARCHAR},
          
          
            #{sex,jdbcType=VARCHAR},
          
        
      
      
      
        select * from USERINFO
      
    

    
    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

  • 更多JavaEE资料请关注下面公众号，欢迎广大开发者朋友一起交流。笔者电话(微信)：18629374628 

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