SpringBoot + Druid + MyBatis Plus整合配置实现

<!-- Spring Boot Starter -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!-- MyBatis Plus Starter -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.2</version>
</dependency>

<!-- Druid 连接池 -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.2.16</version>
</dependency>

<!-- 数据库驱动 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

<!-- Lombok 简化开发 -->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>

spring:
  datasource:
    # Druid 连接池配置
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      # 数据库连接信息
      url: jdbc:mysql://localhost:3306/test_db?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
      username: root
      password: 123456
      driver-class-name: com.mysql.cj.jdbc.Driver
      
      # 初始化大小、最小、最大连接数
      initial-size: 5
      min-idle: 5
      max-active: 20
      
      # 配置获取连接等待超时的时间
      max-wait: 60000
      
      # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
      time-between-eviction-runs-millis: 60000
      
      # 配置一个连接在池中最小生存的时间，单位是毫秒
      min-evictable-idle-time-millis: 300000
      
      # 用来检测连接是否有效的sql，要求是一个查询语句
      validation-query: SELECT 1
      
      # 建议配置为true，不影响性能，并且保证安全性
      test-while-idle: true
      
      # 申请连接时执行validationQuery检测连接是否有效
      test-on-borrow: false
      
      # 归还连接时执行validationQuery检测连接是否有效
      test-on-return: false
      
      # 打开PSCache，并且指定每个连接上PSCache的大小
      pool-prepared-statements: true
      max-pool-prepared-statement-per-connection-size: 20
      
      # 配置监控统计拦截的filters
      filters: stat,wall,log4j2
      
      # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
      connection-properties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
      
      # 合并多个DruidDataSource的监控数据
      use-global-data-source-stat: true
      
      # 监控配置
      stat-view-servlet:
        enabled: true
        url-pattern: /druid/*
        login-username: admin
        login-password: admin
        # 允许重置统计数据
        reset-enable: true
        # IP白名单
        allow: 127.0.0.1
        # IP黑名单
        deny: 192.168.1.100
      
      # WebStatFilter配置
      web-stat-filter:
        enabled: true
        url-pattern: /*
        exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"

# MyBatis Plus 配置
mybatis-plus:
  # 指定Mapper XML文件位置
  mapper-locations: classpath*:mapper/**/*.xml
  # 指定实体类包路径
  type-aliases-package: com.example.entity
  # 配置驼峰命名规则
  configuration:
    map-underscore-to-camel-case: true
    # 打印SQL日志
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  # 全局配置
  global-config:
    db-config:
      # 主键策略
      id-type: AUTO
      # 逻辑删除配置
      logic-delete-field: deleted
      logic-delete-value: 1
      logic-not-delete-value: 0

package com.example;

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

@SpringBootApplication
@MapperScan("com.example.mapper") // 扫描Mapper接口所在包
public class SpringbootDruidMybatisPlusApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootDruidMybatisPlusApplication.class, args);
    }

}

package com.example.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.sql.SQLException;

@Configuration
public class DruidConfig {

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.druid")
    public DataSource druidDataSource() throws SQLException {
        DruidDataSource druidDataSource = new DruidDataSource();
        // 可以在这里进行额外的配置
        return druidDataSource;
    }
}

package com.example.config;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MyBatisPlusConfig {

    /**
     * 配置分页插件
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        // 添加分页插件
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        return interceptor;
    }
}

package com.example.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.io.Serializable;
import java.time.LocalDateTime;

@Data
@TableName("user") // 指定表名
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    @TableId(value = "id", type = IdType.AUTO) // 主键配置
    private Long id;

    @TableField("username") // 指定字段名
    private String username;

    @TableField("password")
    private String password;

    @TableField("email")
    private String email;

    @TableField(value = "create_time", fill = FieldFill.INSERT) // 自动填充
    private LocalDateTime createTime;

    @TableField(value = "update_time", fill = FieldFill.INSERT_UPDATE) // 自动填充
    private LocalDateTime updateTime;

    @TableField("deleted")
    @TableLogic // 逻辑删除
    private Integer deleted;
}

package com.example.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.entity.User;
import org.springframework.stereotype.Repository;

@Repository
public interface UserMapper extends BaseMapper<User> {
    // 可以添加自定义的SQL方法
}

package com.example.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.example.entity.User;

public interface UserService extends IService<User> {
    // 可以添加自定义的业务方法
}

package com.example.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.entity.User;
import com.example.mapper.UserMapper;
import com.example.service.UserService;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
    // 实现自定义的业务方法
}