SpringBoot原理分析并整合其他框架

小二与小七 2020-04-17

434

昨天说了搭建springboot的第一种方式，今天再说说其他几种，然后再整合一些常用的技术。

1 创建springboot项目的方式二

使用idea提供的快速创建springboot的方式。

修改下项目信息，然后next。

选择需要的依赖（我在这选择了web，lombook，mybatis，springboot版本，在此只是做个演示，我也不喜欢这种方式），然后next。

最后修改项目名，保存路径，然后finish等待项目初始化完成，最后可以看到pom文件中已经引入了刚刚手动添加的依赖。

<?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>2.2.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</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>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2 原理分析

按住Ctrl 键点击spring-boot-starter-parent可以看到spring-boot-starter-parent这个工程的pom。

同样在按住Ctrl点击 spring-boot-dependencies跳转到这个工程的pom文件。

看以看到这里引入了非常多的依赖，properties标签中是对依赖的版本进行管理。

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-dependencies</artifactId>
  <version>2.2.1.RELEASE</version>
  <packaging>pom</packaging>
  <name>Spring Boot Dependencies</name>
  <description>Spring Boot Dependencies</description>
  <url>https://projects.spring.io/spring-boot/#</url>
  <licenses>
    <license>
      <name>Apache License, Version 2.0</name>
      <url>https://www.apache.org/licenses/LICENSE-2.0</url>
    </license>
  </licenses>
  <developers>
    <developer>
      <name>Pivotal</name>
      <email>info@pivotal.io</email>
      <organization>Pivotal Software, Inc.</organization>
      <organizationUrl>https://www.spring.io</organizationUrl>
    </developer>
  </developers>
  <scm>
    <url>https://github.com/spring-projects/spring-boot</url>
  </scm>
  <properties>
    <activemq.version>5.15.10</activemq.version>
    <antlr2.version>2.7.7</antlr2.version>
    <appengine-sdk.version>1.9.76</appengine-sdk.version>
    <artemis.version>2.10.1</artemis.version>
    <aspectj.version>1.9.4</aspectj.version>
    <assertj.version>3.13.2</assertj.version>
    <atomikos.version>4.0.6</atomikos.version>
    <awaitility.version>4.0.1</awaitility.version>
    <bitronix.version>2.1.4</bitronix.version>
    <build-helper-maven-plugin.version>3.0.0</build-helper-maven-plugin.version>
    <byte-buddy.version>1.10.2</byte-buddy.version>
    <caffeine.version>2.8.0</caffeine.version>
    <cassandra-driver.version>3.7.2</cassandra-driver.version>
    <classmate.version>1.5.1</classmate.version>
    <commons-codec.version>1.13</commons-codec.version>
    <commons-dbcp2.version>2.7.0</commons-dbcp2.version>
    <commons-lang3.version>3.9</commons-lang3.version>
    <commons-pool.version>1.6</commons-pool.version>
    <commons-pool2.version>2.7.0</commons-pool2.version>
    <couchbase-cache-client.version>2.1.0</couchbase-cache-client.version>
    <couchbase-client.version>2.7.9</couchbase-client.version>
    <db2-jdbc.version>11.5.0.0</db2-jdbc.version>
    <dependency-management-plugin.version>1.0.8.RELEASE</dependency-management-plugin.version>
    <derby.version>10.14.2.0</derby.version>
    <dropwizard-metrics.version>4.1.1</dropwizard-metrics.version>
    <ehcache.version>2.10.6</ehcache.version>
    <ehcache3.version>3.8.1</ehcache3.version>
    <elasticsearch.version>6.8.4</elasticsearch.version>
    <embedded-mongo.version>2.2.0</embedded-mongo.version>
    <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
    <flatten-maven-plugin.version>1.1.0</flatten-maven-plugin.version>
    <flyway.version>6.0.8</flyway.version>
    <freemarker.version>2.3.29</freemarker.version>
    <git-commit-id-plugin.version>3.0.1</git-commit-id-plugin.version>
    <glassfish-el.version>3.0.3</glassfish-el.version>
    <glassfish-jaxb.version>2.3.2</glassfish-jaxb.version>
    <groovy.version>2.5.8</groovy.version>
    <gson.version>2.8.6</gson.version>
    <h2.version>1.4.200</h2.version>
    <hamcrest.version>2.1</hamcrest.version>
    <hazelcast.version>3.12.4</hazelcast.version>
    <hazelcast-hibernate5.version>1.3.2</hazelcast-hibernate5.version>
    <hibernate.version>5.4.8.Final</hibernate.version>
    <hibernate-validator.version>6.0.18.Final</hibernate-validator.version>
    <hikaricp.version>3.4.1</hikaricp.version>
    <hsqldb.version>2.5.0</hsqldb.version>
    <htmlunit.version>2.36.0</htmlunit.version>
    <httpasyncclient.version>4.1.4</httpasyncclient.version>
    <httpclient.version>4.5.10</httpclient.version>
    <httpcore.version>4.4.12</httpcore.version>
    <infinispan.version>9.4.16.Final</infinispan.version>
    <influxdb-java.version>2.15</influxdb-java.version>
    <jackson.version>2.10.0</jackson.version>
    <jackson-bom.version>${jackson.version}</jackson-bom.version>
    <jakarta-activation.version>1.2.1</jakarta-activation.version>
    <jakarta-annotation.version>1.3.5</jakarta-annotation.version>
    <jakarta-jms.version>2.0.3</jakarta-jms.version>
    <jakarta-json.version>1.1.6</jakarta-json.version>
    <jakarta-json-bind.version>1.0.2</jakarta-json-bind.version>
    <jakarta-mail.version>1.6.4</jakarta-mail.version>
    <jakarta-persistence.version>2.2.3</jakarta-persistence.version>
    <jakarta-servlet.version>4.0.3</jakarta-servlet.version>
    <jakarta-servlet-jsp.version>2.3.5</jakarta-servlet-jsp.version>
    <jakarta-servlet-jsp-jstl.version>1.2.7</jakarta-servlet-jsp-jstl.version>
    <jakarta-transaction.version>1.3.3</jakarta-transaction.version>
    <jakarta-validation.version>2.0.1</jakarta-validation.version>
    <jakarta-websocket.version>1.1.2</jakarta-websocket.version>
    <jakarta-ws-rs.version>2.1.6</jakarta-ws-rs.version>
    <jakarta-xml-bind.version>2.3.2</jakarta-xml-bind.version>
    <jakarta-xml-ws.version>2.3.2</jakarta-xml-ws.version>
    <janino.version>3.1.0</janino.version>
    <javax-activation.version>1.2.0</javax-activation.version>
    <javax-annotation.version>1.3.2</javax-annotation.version>
    <javax-cache.version>1.1.1</javax-cache.version>
    <javax-jaxb.version>2.3.1</javax-jaxb.version>
    <javax-jaxws.version>2.3.1</javax-jaxws.version>
    <javax-jms.version>2.0.1</javax-jms.version>
    <javax-json.version>1.1.4</javax-json.version>
    <javax-jsonb.version>1.0</javax-jsonb.version>
    <javax-mail.version>1.6.2</javax-mail.version>
    <javax-money.version>1.0.3</javax-money.version>
    <javax-persistence.version>2.2</javax-persistence.version>
    <javax-transaction.version>1.3</javax-transaction.version>
    <javax-validation.version>2.0.1.Final</javax-validation.version>
    <javax-websocket.version>1.1</javax-websocket.version>
    <jaxen.version>1.2.0</jaxen.version>
    <jaybird.version>3.0.6</jaybird.version>
    <jboss-logging.version>3.4.1.Final</jboss-logging.version>
    <jboss-transaction-spi.version>7.6.0.Final</jboss-transaction-spi.version>
    <jdom2.version>2.0.6</jdom2.version>
    <jedis.version>3.1.0</jedis.version>
    <jersey.version>2.29.1</jersey.version>
    <jest.version>6.3.1</jest.version>
    <jetty.version>9.4.22.v20191022</jetty.version>
    <jetty-el.version>8.5.40</jetty-el.version>
    <jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
    <jetty-reactive-httpclient.version>1.0.3</jetty-reactive-httpclient.version>
    <jmustache.version>1.15</jmustache.version>
    <jna.version>4.5.2</jna.version>
    <joda-time.version>2.10.5</joda-time.version>
    <johnzon.version>${johnzon-jsonb.version}</johnzon.version>
    <johnzon-jsonb.version>1.2.1</johnzon-jsonb.version>
    <jolokia.version>1.6.2</jolokia.version>
    <jooq.version>3.12.3</jooq.version>
    <jsonassert.version>1.5.0</jsonassert.version>
    <json-path.version>2.4.0</json-path.version>
    <jstl.version>1.2</jstl.version>
    <jtds.version>1.3.1</jtds.version>
    <junit.version>4.12</junit.version>
    <junit-jupiter.version>5.5.2</junit-jupiter.version>
    <kafka.version>2.3.1</kafka.version>
    <kotlin.version>1.3.50</kotlin.version>
    <kotlin-coroutines.version>1.3.2</kotlin-coroutines.version>
    <lettuce.version>5.2.1.RELEASE</lettuce.version>
    <liquibase.version>3.8.0</liquibase.version>
    <log4j2.version>2.12.1</log4j2.version>
    <logback.version>1.2.3</logback.version>
    <lombok.version>1.18.10</lombok.version>
    <mariadb.version>2.4.4</mariadb.version>
    <maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
    <maven-assembly-plugin.version>3.1.1</maven-assembly-plugin.version>
    <maven-clean-plugin.version>3.1.0</maven-clean-plugin.version>
    <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
    <maven-dependency-plugin.version>3.1.1</maven-dependency-plugin.version>
    <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
    <maven-enforcer-plugin.version>3.0.0-M2</maven-enforcer-plugin.version>
    <maven-failsafe-plugin.version>2.22.2</maven-failsafe-plugin.version>
    <maven-help-plugin.version>3.2.0</maven-help-plugin.version>
    <maven-install-plugin.version>2.5.2</maven-install-plugin.version>
    <maven-invoker-plugin.version>3.2.1</maven-invoker-plugin.version>
    <maven-jar-plugin.version>3.1.2</maven-jar-plugin.version>
    <maven-javadoc-plugin.version>3.1.1</maven-javadoc-plugin.version>
    <maven-resources-plugin.version>3.1.0</maven-resources-plugin.version>
    <maven-shade-plugin.version>3.2.1</maven-shade-plugin.version>
    <maven-site-plugin.version>3.8.2</maven-site-plugin.version>
    <maven-source-plugin.version>3.1.0</maven-source-plugin.version>
    <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
    <maven-war-plugin.version>3.2.3</maven-war-plugin.version>
    <micrometer.version>1.3.1</micrometer.version>
    <mimepull.version>1.9.12</mimepull.version>
    <mockito.version>3.1.0</mockito.version>
    <mongodb.version>3.11.2</mongodb.version>
    <mongo-driver-reactivestreams.version>1.12.0</mongo-driver-reactivestreams.version>
    <mssql-jdbc.version>7.4.1.jre8</mssql-jdbc.version>
    <mysql.version>8.0.18</mysql.version>
    <nekohtml.version>1.9.22</nekohtml.version>
    <neo4j-ogm.version>3.2.2</neo4j-ogm.version>
    <netty.version>4.1.43.Final</netty.version>
    <netty-tcnative.version>2.0.26.Final</netty-tcnative.version>
    <nio-multipart-parser.version>1.1.0</nio-multipart-parser.version>
    <ojdbc.version>19.3.0.0</ojdbc.version>
    <okhttp3.version>3.14.4</okhttp3.version>
    <pooled-jms.version>1.0.6</pooled-jms.version>
    <postgresql.version>42.2.8</postgresql.version>
    <prometheus-pushgateway.version>0.7.0</prometheus-pushgateway.version>
    <quartz.version>2.3.2</quartz.version>
    <querydsl.version>4.2.1</querydsl.version>
    <rabbit-amqp-client.version>5.7.3</rabbit-amqp-client.version>
    <reactive-streams.version>1.0.3</reactive-streams.version>
    <reactor-bom.version>Dysprosium-SR1</reactor-bom.version>
    <rest-assured.version>3.3.0</rest-assured.version>
    <rsocket.version>1.0.0-RC5</rsocket.version>
    <rxjava.version>1.3.8</rxjava.version>
    <rxjava2.version>2.2.14</rxjava2.version>
    <rxjava-adapter.version>1.2.1</rxjava-adapter.version>
    <saaj-impl.version>1.5.1</saaj-impl.version>
    <selenium.version>3.141.59</selenium.version>
    <selenium-htmlunit.version>2.36.0</selenium-htmlunit.version>
    <sendgrid.version>4.4.1</sendgrid.version>
    <servlet-api.version>4.0.1</servlet-api.version>
    <slf4j.version>1.7.29</slf4j.version>
    <snakeyaml.version>1.25</snakeyaml.version>
    <solr.version>8.2.0</solr.version>
    <spring-amqp.version>2.2.1.RELEASE</spring-amqp.version>
    <spring-batch.version>4.2.0.RELEASE</spring-batch.version>
    <spring-cloud-connectors.version>2.0.6.RELEASE</spring-cloud-connectors.version>
    <spring-data-releasetrain.version>Moore-SR1</spring-data-releasetrain.version>
    <spring-framework.version>5.2.1.RELEASE</spring-framework.version>
    <spring-hateoas.version>1.0.1.RELEASE</spring-hateoas.version>
    <spring-integration.version>5.2.1.RELEASE</spring-integration.version>
    <spring-kafka.version>2.3.3.RELEASE</spring-kafka.version>
    <spring-ldap.version>2.3.2.RELEASE</spring-ldap.version>
    <spring-restdocs.version>2.0.4.RELEASE</spring-restdocs.version>
    <spring-retry.version>1.2.4.RELEASE</spring-retry.version>
    <spring-security.version>5.2.1.RELEASE</spring-security.version>
    <spring-session-bom.version>Corn-RELEASE</spring-session-bom.version>
    <spring-ws.version>3.0.8.RELEASE</spring-ws.version>
    <sqlite-jdbc.version>3.28.0</sqlite-jdbc.version>
    <sun-mail.version>${jakarta-mail.version}</sun-mail.version>
    <thymeleaf.version>3.0.11.RELEASE</thymeleaf.version>
    <thymeleaf-extras-data-attribute.version>2.0.1</thymeleaf-extras-data-attribute.version>
    <thymeleaf-extras-java8time.version>3.0.4.RELEASE</thymeleaf-extras-java8time.version>
    <thymeleaf-extras-springsecurity.version>3.0.4.RELEASE</thymeleaf-extras-springsecurity.version>
    <thymeleaf-layout-dialect.version>2.4.1</thymeleaf-layout-dialect.version>
    <tomcat.version>9.0.27</tomcat.version>
    <unboundid-ldapsdk.version>4.0.12</unboundid-ldapsdk.version>
    <undertow.version>2.0.27.Final</undertow.version>
    <versions-maven-plugin.version>2.7</versions-maven-plugin.version>
    <webjars-hal-browser.version>3325375</webjars-hal-browser.version>
    <webjars-locator-core.version>0.41</webjars-locator-core.version>
    <wsdl4j.version>1.6.3</wsdl4j.version>
    <xml-maven-plugin.version>1.0.2</xml-maven-plugin.version>
    <xmlunit2.version>2.6.3</xmlunit2.version>
  </properties>

我们创建的工程继承了spring-boot-starter-parent后已经具备版本锁定等配置了，所以 spring-boot-starter-parent的作用就是进行依赖的传递。

3 自动配置的分析

关键还在于@SpringSBootApplication这个注解，按住Ctrl点击查看源码。

分析如下，哈哈哈我爱上了画图我觉得

最后在茫茫多的依赖中找到了这个文件，这个文件里以Conﬁguration结尾的类名称都是存有自动配置信息的类，而 SpringApplication先获取这些类名后再加载

如下以ServletWebServerFactoryAutoConﬁguration为例来分析源码：

@Configuration(
    proxyBeanMethods = false
)
@AutoConfigureOrder(-2147483648)
@ConditionalOnClass({ServletRequest.class})
@ConditionalOnWebApplication(
    type = Type.SERVLET
)
@EnableConfigurationProperties({ServerProperties.class})
@Import({ServletWebServerFactoryAutoConfiguration.BeanPostProcessorsRegistrar.class, EmbeddedTomcat.class, EmbeddedJetty.class, EmbeddedUndertow.class})
public class ServletWebServerFactoryAutoConfiguration {
    public ServletWebServerFactoryAutoConfiguration() {
    }
}

@EnableConﬁgurationProperties(ServerProperties.class) 代表加载ServerProperties服务器配置属性类，其部分源码如下：

prefix = "server"表示SpringBoot配置文件中的前缀，SpringBoot会将配置文件中以server开始的属性映射到该类的对应字段中，比如我们修改这个端口号为10000，maven工程在resources目录下定义配置文件（properties和yaml文件都可以）。

4 SpringBoot整合Mybatis

添加相关依赖如下

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>


    <!--  当前项目讯息  -->
    <groupId>com.xiaoqi</groupId>
    <artifactId>springboot_project</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <!--  指定打包方式  -->
    <packaging>jar</packaging>


    <!-- springboot启动器   -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
    </parent>


    <dependencies>
        <!-- web启动器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>


<!--        mybatis启动器 -->
<!--        <dependency>-->
<!--            <groupId>org.mybatis.spring.boot</groupId>-->
<!--            <artifactId>mybatis-spring-boot-starter</artifactId>-->
<!--            <version>2.1.0</version>-->
<!--        </dependency>-->


        <!-- MySQL连接驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.39</version>
        </dependency>


        <!-- 通用mapper-->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.1.5</version>
        </dependency>


        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>


        <!--热部署配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>
</project>

5 测试

创建表

CREATE TABLE `employee` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(30) NOT NULL,
  `age` INT(11) DEFAULT NULL,
  `dept_id` INT(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `emp_dept_id` (`dept_id`),
  CONSTRAINT `emp_dept_id` FOREIGN KEY (`dept_id`) REFERENCES `department` (`id`)
) ENGINE=INNODB AUTO_INCREMENT=18 DEFAULT CHARSET=gbk

pojo编写，表对应的实体类

package com.xiaoqi.domain;


import lombok.Data;


import javax.persistence.Id;
import javax.persistence.Table;


@Data
@Table(name = "employee")
public class Employee {
    //指定主键
    @Id
    private Long id;
    private String name;
    private Long age;
    private Long dept_id;


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

dao，用来从数据库获取数据

package com.xiaoqi.dao;
import com.xiaoqi.domain.Employee;
import tk.mybatis.mapper.common.Mapper;
public interface EmployeeDao extends Mapper<Employee> {
}

service

package com.xiaoqi.service;


import com.xiaoqi.domain.Employee;
import java.util.List;


public interface EmployeeService {
    List<Employee> findAll();
}

package com.xiaoqi.service.impl;


import com.xiaoqi.dao.EmployeeDao;
import com.xiaoqi.domain.Employee;
import com.xiaoqi.service.EmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;


@Service
public class EmployeeServiceImpl implements EmployeeService {


    @Autowired
    private EmployeeDao dao;


    @Override
    public List<Employee> findAll() {
        return dao.selectAll();
    }
}

controller

package com.xiaoqi.controller;


import com.xiaoqi.domain.Employee;
import com.xiaoqi.service.impl.EmployeeServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;


import java.util.List;


@RestController
@RequestMapping("/employee")
public class EmployeeController {


    @Autowired
    private EmployeeServiceImpl service;


    @GetMapping("/all")
    public List<Employee> findAll(){
        return  service.findAll();
    }
}

application.yml配置文件

server:
  port: 10000
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/db1
    username: root
    password: 1234

启动类

package com.xiaoqi;


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


@SpringBootApplication
@MapperScan("com.xiaoqi.dao")
public class SpringBootApplicationDemo {


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

浏览器测试

又到了睡觉时间！

数据库

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