SpringBoot整合mybatis，mysql，pagehelper，swagger2

SpringBoot整合mybatis，mysql，pagehelper

首先看目录结构


添加maven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>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.atguigu</groupId>
    <artifactId>springboot_demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot_demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <thymeleaf.version>3.0.11.RELEASE</thymeleaf.version>
        <thymeleaf-layout-dialect.version>2.4.1</thymeleaf-layout-dialect.version>
    </properties>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.thymeleaf/thymeleaf -->


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- swagger框架 -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.7.0</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.7.0</version>
        </dependency>
<!--        <dependency>-->
<!--            <groupId>com.github.pagehelper</groupId>-->
<!--            <artifactId>pagehelper</artifactId>-->
<!--            <version>3.6.3</version>-->
<!--        </dependency>-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.17</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

配置application.yml

spring:
  datasource:
    druid:
      username: root
      password: password
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://localhost:3306/miniprogramwx?useUnicode=true&characterEncoding=utf-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
      initial-size: 5
      min-idle: 5
      max-active: 20
      maxWait: 10000
      testOnBorrow: true
      testOnReturn: false
      timeBetweenEvictionRunsMillis: 60000
      minEvictableIdleTimeMillis: 300000

mybatis:
  type-aliases-package: com.atguigu.springboot_demo.dao.entity
  #mapper-locations: classpath:/mappers/*.xml
  #config-location: classpath:mybatis-config.xml
#ssl证书文件名
#server:
#  ssl:
#    key-store:
#    key-store-password:
#    key-store-type:

Swagger2Config类

package com.atguigu.springboot_demo.config;

import org.springframework.context.annotation.Bean;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;

/**
 * @Author liuhaoqi
 * @Date 2020/3/11 17:44
 * @Version 1.0
 */
public class Swagger2Config {
    /**
     * 创建swagger ui的摘要
     *
     * @return
     */
    @Bean
    public Docket docket() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                // 扫描的class的包路径
                .apis(RequestHandlerSelectors.basePackage("com.atguigu.springboot_demo.controller"))
                // 只扫描类上有API注解的class
                // .apis(RequestHandlerSelectors.withClassAnnotation(Api.class))
                // 只扫描方法上有ApiOperation注解的方法
                // .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
                .paths(PathSelectors.any())
                .build();
    }

    /**
     * swagger ui的标题信息
     *
     * @return
     */
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("标题")
                .description("副标题")
                .version("1.0")
                .build();
    }
}

MybatisConfig类 用来解析pagehelper

package com.atguigu.springboot_demo.config;

import com.github.pagehelper.PageHelper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Properties;

/**
 * @Author liuhaoqi
 * @Date 2020/3/12 10:19
 * @Version 1.0
 */
@Configuration
public class MybatisConfig {

    @Bean
    public PageHelper pageHelper() {
        PageHelper pageHelper=new PageHelper();
        Properties p=new Properties();

        // 设置为true时，会将RowBounds第一个参数offset当成pageNum页码使用
        p.setProperty("offsetAsPageNum","true");
        //设置为true时，使用RowBounds分页会进行count查询
        p.setProperty("rowBoundsWithCount","true");
        p.setProperty("reasonable","true");
        pageHelper.setProperties(p);
        return pageHelper;
    }
}

controller

package com.atguigu.springboot_demo.controller;

import com.atguigu.springboot_demo.service.serviceImpl.AdminServiceImpl;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiOperation;
import javafx.beans.binding.ObjectExpression;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

/**
 * @Author liuhaoqi
 * @Date 2020/3/11 17:46
 * @Version 1.0
 */
@Controller
@RequestMapping("/test")
@Api(value = "/test",description = "Operation about test" , tags = "测试管理")
public class TestController  {

    @Autowired
    private AdminServiceImpl adminService;

    private Logger logger= LoggerFactory.getLogger(TestController.class);
    @ApiOperation(value = "测试方法一",httpMethod = "GET",notes = "每过几秒就纪录一次")
    @ApiImplicitParam(name = "data", value = "返回的数据对象", dataType = "Object")
    @GetMapping("/test01")
    @ResponseBody
    public String test() {
        return "test success!";
    }


    @ApiOperation( httpMethod = "GET", notes = "每过几秒就纪录一次", value = "/findAll")
    @ApiImplicitParam(name = "data", value = "返回的数据对象", dataType = "Object")
    @GetMapping("/findAll")
    @ResponseBody
    public Object findAll(@RequestParam(value = "page",defaultValue = "1") int page,
                          @RequestParam(value = "size",defaultValue = "10") int size) {
        return adminService.findAll(page,size);
    }
}

service

package com.atguigu.springboot_demo.service;

import com.atguigu.springboot_demo.dao.entity.AdminDao;

import java.util.List;

/**
 * @Author liuhaoqi
 * @Date 2020/3/12 10:22
 * @Version 1.0
 */
public interface AdminService {
    public Object findAll(int page,int size);
}

serviceImpl

package com.atguigu.springboot_demo.service.serviceImpl;

import com.atguigu.springboot_demo.dao.entity.AdminDao;
import com.atguigu.springboot_demo.dao.mapper.AdminMapper;
import com.atguigu.springboot_demo.service.AdminService;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @Author liuhaoqi
 * @Date 2020/3/12 10:23
 * @Version 1.0
 */
@Service
public class AdminServiceImpl implements AdminService {

    @Autowired
    private AdminMapper adminMapper;

    public Object findAll(int page,int size) {
        PageHelper.startPage(page,size);
        List<AdminDao> adminDaoList=adminMapper.findAll();
        PageInfo<AdminDao> pageInfo=new PageInfo<>(adminDaoList);
        return pageInfo;
    }
}

dao Mapper.java

package com.atguigu.springboot_demo.dao.mapper;


import com.atguigu.springboot_demo.dao.entity.AdminDao;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @Author liuhaoqi
 * @Date 2020/3/12 10:25
 * @Version 1.0
 */
@Component
@Mapper
public interface AdminMapper {
    List<AdminDao> findAll();
}

实体类

package com.atguigu.springboot_demo.dao.entity;

import lombok.Data;

/**
 * @Author liuhaoqi
 * @Date 2020/3/12 10:44
 * @Version 1.0
 */
@Data
public class AdminDao {
    private Integer admin_id;
    private String account;
    private String password;
}

springboot启动类

package com.atguigu.springboot_demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@EnableSwagger2
@SpringBootApplication
@MapperScan("com.atguigu.springboot_demo.dao.mapper")
public class SpringbootDemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootDemoApplication.class, args);
    }
}

mapper.xml映射文件配置
这个文件一定要和mapper.java文件在同一个目录下，比如放在resources资源目录下，那么它的文件文件路径就一定要在java包下的Mapper.java文件路径相同，建立相同的目录结构。否则就会报没有绑定成功的错！！！

<?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.atguigu.springboot_demo.dao.mapper.AdminMapper">
    <select id="findAll" resultType="com.atguigu.springboot_demo.dao.entity.AdminDao">
        SELECT * FROM `admin`
    </select>

</mapper>

数据库：

测试：