spring boot的使用入门-使用Druid连接池整合Mybatis-Plus连接Mysql数据库
使用Druid连接池整合Mybatis-Plus
- 1、添加依赖
- 2、修改application.properties配置文件
- 3、Druid 部分代码
- 1 DruidConfiguration 配置类
- 4、Mybatis-Plus部分
- 5、其他部分代码
- Model
- Mapper 和 Mapper.xml
- Service 和 ServiceImpl
- Controller
- 6、工程结构图
- 7、测试
- 发送请求
- druid管理界面
- 8、数据库表
1、添加依赖
<!--Mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- Druid依赖 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.25</version>
</dependency>
<!-- log4j 不加此依赖Druid的filters拦截会报错 在properties配置文件中filters中有体现 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- MyBatisPlus -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus</artifactId>
<version>2.1.9</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatisplus-spring-boot-starter</artifactId>
<version>1.0.5</version>
</dependency>
2、修改application.properties配置文件
######################################
###spring datasource
######################################
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
spring.datasource.maxWait=60000
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.filters=stat,wall,log4j
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
######################################
###MyBatis-Plus
######################################
mybatis-plus.mapper-locations=classpath:mappers/*.xml mybatis-plus.type-aliases-package=com.example.demo.model 3、Druid 部分代码
1 DruidConfiguration 配置类
package com.example.demo.config;
import javax.sql.DataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
@Configuration
public class DruidConfiguration {
private static final Logger log = LoggerFactory.getLogger(DruidConfiguration.class);
@Bean(destroyMethod = "close", initMethod = "init")
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource druidDataSource() {
DruidDataSource druidDataSource = new DruidDataSource();
return druidDataSource;
}
/** * 注册一个StatViewServlet */
@Bean
public ServletRegistrationBean<StatViewServlet> druidStatViewServlet() {
log.info("init Druid Servlet Configuration");
// org.springframework.boot.context.embedded.ServletRegistrationBean提供类的进行注册.
ServletRegistrationBean<StatViewServlet> servletRegistrationBean = new ServletRegistrationBean<StatViewServlet>(
new StatViewServlet(), "/druid/*");
// 添加初始化参数：initParams
// 白名单：
servletRegistrationBean.addInitParameter("allow", "127.0.0.1");
// IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to
// view this page.
servletRegistrationBean.addInitParameter("deny", "192.168.1.73");
// 登录查看信息的账号密码.
servletRegistrationBean.addInitParameter("loginUsername", "admin");
servletRegistrationBean.addInitParameter("loginPassword", "password");
// 是否能够重置数据.
servletRegistrationBean.addInitParameter("resetEnable", "false");
return servletRegistrationBean;
}
/** * 注册一个：filterRegistrationBean */
@Bean
public FilterRegistrationBean<WebStatFilter> druidStatFilter() {
FilterRegistrationBean<WebStatFilter> filterRegistrationBean = new FilterRegistrationBean<WebStatFilter>(
new WebStatFilter());
// 添加过滤规则.
filterRegistrationBean.addUrlPatterns("/*");
// 添加不需要忽略的格式信息.
filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
return filterRegistrationBean;
}
}
4、Mybatis-Plus部分
说明：Mybatis-Plus（简称MP）是一个Mybatis的增强工具，在Mybatis的基础上只做了增强，不做改变。使用MP既可以使用MP的特有功能，又能够正常使用Mybatis的原生功能。MP是为简化开发、提高开发效率而生，它也提供了一些特有的插件，比如SQL性能监控、乐观锁、执行分析等。其中一个功能Generator后续会单独写个文章说明
package com.example.demo.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import com.baomidou.mybatisplus.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.plugins.PerformanceInterceptor;
@Configuration
@EnableTransactionManagement
public class MybatisPlusConfig {
/*** * plus 的性能优化 */
@Bean
public PerformanceInterceptor performanceInterceptor() {
PerformanceInterceptor performanceInterceptor = new PerformanceInterceptor();
/* */
//performanceInterceptor.setMaxTime(1000);
/* */
performanceInterceptor.setFormat(false);
return performanceInterceptor;
}
/** * mybatis-plus 分页插件 */
@Bean
public PaginationInterceptor paginationInterceptor() {
PaginationInterceptor page = new PaginationInterceptor();
page.setDialectType("mysql");
return page;
}
}
添加mapper扫描↓
package com.example.demo;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.example.demo.mapper")
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
5、其他部分代码
Model
package com.example.demo.model;
import com.baomidou.mybatisplus.enums.IdType;
import com.baomidou.mybatisplus.annotations.TableId;
import com.baomidou.mybatisplus.annotations.TableField;
import com.baomidou.mybatisplus.activerecord.Model;
import com.baomidou.mybatisplus.annotations.TableName;
import java.io.Serializable;
/** * * 实体类 *
* * @author only3c * @since 2019-02-28 */
@TableName("city")
public class City extends Model<City> {
private static final long serialVersionUID = 1L;
@TableId(value = "id", type = IdType.AUTO)
private Integer id;
@TableField("city_name")
private String cityName;
@TableField("parent_id")
private Integer parentId;
@TableField("parent_name")
private String parentName;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getCityName() {
return cityName;
}
public void setCityName(String cityName) {
this.cityName = cityName;
}
public Integer getParentId() {
return parentId;
}
public void setParentId(Integer parentId) {
this.parentId = parentId;
}
public String getParentName() {
return parentName;
}
public void setParentName(String parentName) {
this.parentName = parentName;
}
@Override
protected Serializable pkVal() {
return this.id;
}
@Override
public String toString() {
return "City{" +
", id=" + id +
", cityName=" + cityName +
", parentId=" + parentId +
", parentName=" + parentName +
"}";
}
}
Mapper 和 Mapper.xml
package com.example.demo.mapper;
import com.example.demo.model.City;
import com.baomidou.mybatisplus.mapper.BaseMapper;
/** * * Mapper 接口 *
* * @author only3c * @since 2019-02-28 */
public interface CityMapper extends BaseMapper<City> {
}
<?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.example.demo.mapper.CityMapper">
<!-- 通用查询映射结果 -->
<resultMap id="BaseResultMap" type="com.example.demo.model.City">
<id column="id" property="id" />
<result column="city_name" property="cityName" />
<result column="parent_id" property="parentId" />
<result column="parent_name" property="parentName" />
</resultMap>
<!-- 通用查询结果列 -->
<sql id="Base_Column_List">
id, city_name AS cityName, parent_id AS parentId, parent_name AS parentName
</sql>
</mapper>
Service 和 ServiceImpl
package com.example.demo.service;
import com.example.demo.model.City;
import com.baomidou.mybatisplus.service.IService;
/** * * 服务类 *
* * @author only3c * @since 2019-02-28 */
public interface CityService extends IService<City> {
}
package com.example.demo.service.impl;
import com.example.demo.model.City;
import com.example.demo.mapper.CityMapper;
import com.example.demo.service.CityService;
import com.baomidou.mybatisplus.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
/** * * 服务实现类 *
* * @author only3c * @since 2019-02-28 */
@Service
public class CityServiceImpl extends ServiceImpl<CityMapper, City> implements CityService {
}
Controller
package com.example.demo.controller;
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.RestController;
import com.example.demo.mapper.CityMapper;
import com.example.demo.model.City;
/** * * 前端控制器 *
* * @author only3c * @since 2019-02-28 */
@RestController
@RequestMapping("/city")
public class CityController {
@Autowired
private CityMapper cityMapper;
@RequestMapping("/get/{id}")
public City selectUser(@PathVariable("id") String id) {
City city = cityMapper.selectById(id);
return city;
}
}
6、工程结构图
7、测试
发送请求
在浏览器输入 http://localhost:8080/city/get/1
druid管理界面
在浏览器输入 http://localhost:8080/druid/login.html
用户名密码是在DruidConfiguration配置中的loginUsername和loginPassword
主界面
8、数据库表
CREATE TABLE `city` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`city_name` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`parent_id` int(11) NOT NULL,
`parent_name` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci
insert into `city` (`id`, `city_name`, `parent_id`, `parent_name`) values('1','北京','0','北京');