前言

Spring boot项目目前是Java Web开发领域最受市场欢迎的Spring框架之一，也是构建分布式项目、微服务项目重要基础之一，Spring Boot免去了配置繁杂的依赖和配置，使得开发人员把更多的精力放在项目本身上，就Spring框架而言，Spring Boot可谓是集大成者，担负着敏捷开发，前后台分离、模块低耦合的神圣使命；麻将哥也是一个忠实的SpringBoot fans,这篇教程零基础的带大家从新建项目开始，完成一个流程的CRUD。本教程采用Spring Boot+Mybatis+Mysql实现，麻将哥MySql的版本是5.7,建议大家的Mysql是5.7或者5.7+。需要完整源码的小伙伴可以关注麻将哥的微信公众号“码匠心”自行获取，谢谢大家！

准备工作

编辑器：InteIIiJ IDEA

MySql数据库表设计：

IDEA新建Spring Boot 项目这篇文章就不再累赘，需要的小伙伴可以查看麻将哥的上一篇的博客。

构建项目

2.在curddemo目录新建5个package,分别为bean,config,controller,mapper,service,bean主要用来放置实体类文件，config要来放置放置Swagger接口文档的配置类文件，controller用来放置程序控制器（API）类文件，service用来放置处理业务逻辑的类文件，mapper用来放置于数据库映射相关的类文件。建成项目目录如下:

2.在pom.xml文件下添加以下依赖：

<?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 https://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>2.1.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.yisio</groupId>
    <artifactId>curddemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>curddemo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-undertow</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>


        <!-- swagger -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!-- swagger-ui -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!-- druid数据库连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
       <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
        </resources>
    </build>

</project>

3.在resources目录的application.properties文件里配置mysql连接信息：

#Created by 码匠心 on 2019/10/05.
#MySQL配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://localhost:3306/springbootdemo?serverTimezone=UTC&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root
#MyBatis日志配置
mybatis.config-location=classpath:/mybatis-config.xml
#端口配置
server.port=8080

4.在resources目录下新建mybatis日志文件mybatis-config.xml

<!--Created by 码匠心 on 2019/10/05.-->
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING" />
    </settings>
</configuration>

5.在bean目录下新建实体类User.java

package com.yisio.curddemo.bean;
/**
 * Created by 码匠心 on 2019/10/05.
 */
public class User {
    public Integer UserId;
    public String UserName;
    public boolean Sex;
    public boolean Wedlock;
    public String Place;
    public  void setUserId(Integer UserId){this.UserId=UserId;}
    public  void  setUserName(String UserName){this.UserName=UserName;}
    public  void  setSex(boolean Sex){this.Sex=Sex;}
    public  void  setWedlock(boolean Wedlock){this.Wedlock=Wedlock;}
    public  void  setPlace(String Place){this.Place=Place;}
}

6.在config目录下新建Swagger在线接口文档的配置文件SwaggerConfig.java

@Configuration
@EnableSwagger2
public class SwaggerConfig {
        @Bean
        public Docket api(){
            return  new Docket(DocumentationType.SWAGGER_2)
                    .apiInfo(apiInfo())
                    .select()
                    .apis(RequestHandlerSelectors.any())
                    .paths(PathSelectors.any())
                    .build();
        }
        private ApiInfo apiInfo() {
            return new ApiInfoBuilder()
                    //文档标题
                    .title(" Spring Boot RESTful API")
                    // 版本号
                    .version("1.0")
                    // 标题描述
                    .description("swagger在线文档")
                    .build();
        }
    }

7.在mapper目录下新建UserMapper接口文件，新建增删改查的四个方法

package com.yisio.curddemo.mapper;

import com.yisio.curddemo.bean.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
/**
 * Created by 码匠心 on 2019/10/05.
 */
import java.util.List;
@Mapper
public interface UserMapper {
     List<User> getAllUser();
     int AddUser(User users);
     int updateUser(@Param("users") User users);
     int deleteUserByUserId(@Param("ids") String[] ids);
}

8.在mapper目录下新建UserMapper.xml文件，使用mybtis操作数据库

<!--Created by 码匠心 on 2019/10/05.-->
<?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.yisio.curddemo.mapper.UserMapper">
    <resultMap id="BaseResultMap" type="com.yisio.curddemo.bean.User">
        <result column="UserId" property="UserId"/>
        <result column="UserName" property="UserName"/>
        <result column="Sex" property="Sex"/>
        <result column="Wedlock" property="Wedlock"/>
        <result column="Place" property="Place"/>
    </resultMap>
     <select id="getAllUser" resultMap="BaseResultMap">
         select * from sysuser;
     </select>
    <insert id="AddUser"  parameterType="com.yisio.curddemo.bean.User">
        insert into sysuser(UserName,Sex,Wedlock,Place)
        values(#{UserName,jdbcType=VARCHAR},
              #{Sex,jdbcType=BOOLEAN},
              #{Wedlock,jdbcType=BOOLEAN},
              #{Place,jdbcType=VARCHAR})
    </insert>
    <update id="updateUser">
        update sysuser
        <set>
            UserName=#{users.UserName,jdbcType=VARCHAR},
            Sex=#{users.Sex,jdbcType=BOOLEAN},
            Wedlock=#{users.Wedlock,jdbcType=BOOLEAN},
            Place=#{users.Place,jdbcType=VARCHAR}
        </set>
        where UserId=#{users.UserId,jdbcType=INTEGER}
    </update>
    <delete id="deleteUserByUserId">
         DELETE  from sysuser where UserId in
        <foreach collection="ids" separator="," open="(" close=")" item="id">
            #{id}
        </foreach>
    </delete>

</mapper>

9.在service目录下新建业务逻辑类UserService.java

package com.yisio.curddemo.service;

import com.yisio.curddemo.bean.User;
import com.yisio.curddemo.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
/**
 * Created by 码匠心 on 2019/10/05.
 */
@Service
@Transactional
public class UserService {
    @Autowired
    UserMapper userMapper;
    public List<User> getAllUser(){
        return userMapper.getAllUser();
    }
    private  void UserDo(User users)
    {
        users.setUserId(users.UserId);
        users.setUserName(users.UserName);
        users.setPlace(users.Place);
        users.setSex(users.Sex);
        users.setWedlock(users.Wedlock);
    }
    public int AddUser(User users)  {
        UserDo(users);
        return userMapper.AddUser(users);
    }
    public  int updateUser(User users){
        UserDo(users);
        return userMapper.updateUser(users);
    }
    public  boolean deleteUserByUserId(String ids){
      String[] split = ids.split(",");
      return userMapper.deleteUserByUserId(split) == split.length;
    }
}

10.在controller目录下新建业务接口类UserController.java

package com.yisio.curddemo.controller;

import com.yisio.curddemo.bean.User;
import com.yisio.curddemo.service.UserService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;
/**
 * Created by 码匠心 on 2019/10/05.
 */
@RestController
@RequestMapping("/User/UserData")
@Api(value = "UserController",description = "用户管理")
public class UserController {
    @Autowired
    UserService userService;

    @ApiOperation(value = "用户查询")
    @RequestMapping(value = "/UserData",method = RequestMethod.GET)
    public Map<String,Object> getAllUser(){
          Map<String,Object> map=new HashMap<>();
          map.put("User",userService.getAllUser());
          return map;
    }
    @ApiOperation(value = "新增用户")
    @RequestMapping(value = "/UserData/AddUser",method = RequestMethod.POST)
    public String AddUser(User users) { 
        if (userService.AddUser(users)==1)
            return "新增成功！";
        return  "新增失败！";
    }
    @ApiOperation(value = "修改用户")
    @RequestMapping(value = "/UserData/updateUser",method = RequestMethod.PUT)
    public String updateUser(User users){
        if (userService.updateUser(users)==1)
            return "修改成功！";
        return "修改失败！";
    }
    @ApiOperation(value = "删除用户")
    @RequestMapping(value = "/UserData/deleteUser/{ids}",method = RequestMethod.DELETE)
    public String deleteUserByUserId(@PathVariable String ids){
        if(userService.deleteUserByUserId(ids))
          return "删除成功!";
        return "删除失败!";
    }
}

10.最后的项目结构如下：

11.点击右上角项目启动按钮，运行项目，启动窗口看到如下信息则说明项目启动成功

12.在浏览器里输入URL:http://localhost:8080/swagger-ui.html#/,Swagger界面如下：

到这里我们的项目就启动成功了，执行Swagger接口文档里面的各个接口就能执行相应的增删改查操作！

如果需要完整的源码的小伙伴可关注麻将哥的微信公众号“码匠心”，自行获取，谢谢大家！

SpringBoot实战系列1：Spring Boot+Mybatis+MySql实现增删改查

前言

准备工作

构建项目

SpringBoot實戰系列1：Spring Boot+Mybatis+MySql實現增刪改查

Spring Boot集成Swagger API在線文檔

https://yachay.unat.edu.pe/blog/index.php?comment_area=format_blog&comment_component=blog&comment_co

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