springboot+mybatis plus+mysql

一、配置pom.xml

<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.wuxi</groupId>
    <artifactId>springboot_demo1</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <!-- 父级依赖 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.12.RELEASE</version>
    </parent>

    <!-- springmvc和spring的jar包 -->
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.2.0</version>
        </dependency>
        <!-- MySql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- alibaba的druid数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

二、配置application.yml

#服务端口及模块名
server:
  port: 8080
  servlet:
    context-path: /ygst

spring:
#数据源配置
  datasource:
    name: sp
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://192.168.2.120:3306/sp?characterEncoding=utf8&useSSL=false
    username: root
    password: 123456
    type: com.alibaba.druid.pool.DruidDataSource
    filters: stat
    maxActive: 20
    initialSize: 1
    maxWait: 60000
    minIdle: 1
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: select 'x'
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    maxOpenPreparedStatements: 20

mybatis-plus:
#默认扫描mapper.xml的目录
  mapper-locations: classpath*:/mapper/**/*.xml

三、入口程序

package com.wuxi;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication(scanBasePackages = {"com.wuxi"})
@MapperScan("com.wuxi.dao")
public class MyApplication {
    //入口
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

四、bean

package com.wuxi.bean;

public class Person {
    private Integer id;

    private String name;

    private Integer age;

    private Integer sex;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }

    @Override
    public String toString() {
        return "Person{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", sex=" + sex +
                '}';
    }
}

五、dao

package com.wuxi.dao;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.wuxi.bean.Person;
import org.springframework.stereotype.Repository;

/**
 * Created by dingcaiyan on 2020/3/31.
 */
@Repository
public interface PersonMapper extends BaseMapper<Person> {
}

六、service

package com.wuxi.service;

import com.wuxi.bean.Person;
import com.wuxi.dao.PersonMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * Created by dingcaiyan on 2020/3/31.
 */
@Service
@Transactional
public class PersonService {
    @Autowired
    private PersonMapper personMapper;

    public List<Person> selectAllPerson(){
        List<Person> personList = personMapper.selectList(null);
        return personList;
    }
}

七、controller

package com.wuxi.controller;

import com.wuxi.bean.Person;
import com.wuxi.service.PersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class PersonController {

    @Autowired
    private PersonService personService;

    @RequestMapping("/linlong")
    public Object getAllPerson() {
        List<Person> personList = personService.selectAllPerson();
        return personList;
    }
}