本文详细介绍Spring Boot集成MyBatis-Plus框架的方法， 使用MySQL数据库进行测试， 包括完整的开发到测试步骤， 从一开始的Spring Boot工程创建， 到MySQL数据库刷库脚本， 到引入mybatis-plus依赖， 然后编写实现代码和配置文件， 最后使用Junit5成功进行测试。
首先选择创建Spring Starter Project工程： File -> New -> Other... -> Spring Boot -> Spring Starter Project
点击Next:
输入工程名称Name:springboot-mybatis-plus， 选择工程本地保存的目录。
点击Next:
先选择Spring Boot Version, 再选择工程需要的依赖：
Spring Web MySQL Driver Spring Boot DevTools点击Finish自动完成工程的创建。
工程创建完毕后，删除不需要的文件和目录：
.mvn HELP.md mvnw mvnw.cmd在pom.xml中增加mybatis-plus依赖
<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.3.2</version> </dependency>首先删除src\main\resources目录下的文件和目录：
static templates application.properties新建application.yml文件: File -> New -> Other... -> General -> File
点击Next:
选择在src\main\resources目录下创建文件， 填写文件名application.yml。
在application.yml增加配置， 指定服务端口和连接数据库：
server: port: 8088 spring: datasource: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://10.21.13.14:3306/demodb username: demo password: demo123456现有一张User表，其表结构如下：
idameageemail1Jone18test1@baomidou.com2Jack20test2@baomidou.com3Tom28test3@baomidou.com4Sandy21test4@baomidou.com5Billie24test5@baomidou.com对应的数据库create_tables.sql脚本如下：
DROP TABLE IF EXISTS TBL_USER; CREATE TABLE TBL_USER ( id BIGINT(20) NOT NULL COMMENT '主键ID', name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名', age INT(11) NULL DEFAULT NULL COMMENT '年龄', email VARCHAR(50) NULL DEFAULT NULL COMMENT '邮箱', PRIMARY KEY (id) );对应的数据库init_data_user.sql脚本如下：
DELETE FROM TBL_USER; INSERT INTO TBL_USER (id, name, age, email) VALUES (1, 'Jone', 18, 'test1@baomidou.com'), (2, 'Jack', 20, 'test2@baomidou.com'), (3, 'Tom', 28, 'test3@baomidou.com'), (4, 'Sandy', 21, 'test4@baomidou.com'), (5, 'Billie', 24, 'test5@baomidou.com');在MySQL数据库中创建对应的数据库和用户：
CREATE DATABASE demodb; GRANT ALL ON *.* to 'demo'@'%' identified BY 'demo123456' WITH GRANT OPTION;然后使用新建的用户执行上面的脚本进行刷库。
创建实体类User.java：
package com.example.demo.entity; import com.baomidou.mybatisplus.annotation.TableName; @TableName("TBL_USER") public class User { private Long id; private String name; private Integer age; private String email; public Long getId() { return id; } public void setId(Long 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 String getEmail() { return email; } public void setEmail(String email) { this.email = email; } @Override public String toString() { return "User [id=" + id + ", name=" + name + ", age=" + age + ", email=" + email + "]"; } }注意User类的注解@TableName("TBL_USER")， 表示数据库的表TBL_USER和实体类User对应。
在dao层创建Mapper类UserDao.java：
package com.example.demo.dao; import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.example.demo.entity.User; public interface UserDao extends BaseMapper<User> { }注意需要继承BaseMapper<T>泛型类， 并且指定其中T为User类。
在Spring Boot启动类中增加@MapperScan注解， 用于扫描Mapper文件夹：
package com.example.demo; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @MapperScan("com.example.demo.dao") @SpringBootApplication public class SpringbootMybatisPlusApplication { public static void main(String[] args) { SpringApplication.run(SpringbootMybatisPlusApplication.class, args); } }右键启动类SpringbootMybatisPlusApplication.java -> Run As -> Java Application
启动成功日志：
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.3.1.RELEASE) 2020-07-01 15:34:45.160 INFO 12764 --- [ restartedMain] c.e.d.SpringbootMybatisPlusApplication : Starting SpringbootMybatisPlusApplication on yuwen-asiainfo with PID 12764 (D:\Code\Learn\SpringBoot\springboot-mybatis-plus\target\classes started by yuwen in D:\Code\Learn\SpringBoot\springboot-mybatis-plus) 2020-07-01 15:34:45.162 INFO 12764 --- [ restartedMain] c.e.d.SpringbootMybatisPlusApplication : No active profile set, falling back to default profiles: default 2020-07-01 15:34:45.201 INFO 12764 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable 2020-07-01 15:34:45.201 INFO 12764 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG' 2020-07-01 15:34:46.525 INFO 12764 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8088 (http) 2020-07-01 15:34:46.533 INFO 12764 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2020-07-01 15:34:46.533 INFO 12764 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.36] 2020-07-01 15:34:46.588 INFO 12764 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2020-07-01 15:34:46.589 INFO 12764 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1387 ms 2020-07-01 15:34:46.711 INFO 12764 --- [ restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor' _ _ |_ _ _|_. ___ _ | _ | | |\/|_)(_| | |_\ |_)||_|_\ / | 3.3.2 2020-07-01 15:34:47.770 INFO 12764 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729 2020-07-01 15:34:47.969 INFO 12764 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8088 (http) with context path '' 2020-07-01 15:34:47.978 INFO 12764 --- [ restartedMain] c.e.d.SpringbootMybatisPlusApplication : Started SpringbootMybatisPlusApplication in 3.105 seconds (JVM running for 3.492)首先删除\src\test\java目录下的文件：
SpringbootMybatisPlusApplicationTests.java添加测试类SampleTest， 进行功能测试：
package com.example.demo; import java.util.List; import org.junit.Assert; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import com.example.demo.dao.UserDao; import com.example.demo.entity.User; @SpringBootTest public class SampleTest { @Autowired private UserDao userDao; @Test public void testSelect() { System.out.println(("----- selectAll method test ------")); List<User> userList = userDao.selectList(null); Assert.assertEquals(5, userList.size()); userList.forEach(System.out::println); } }注意这里使用的是Junit5进行单元测试， 如果是Junit4需要自行修改相关配置。 右键测试类SampleTest -> Run As -> Run Configurations... 可以看到Test Runner使用的是Junit5:
测试用例执行成功日志
15:49:55.334 [main] DEBUG org.springframework.test.context.BootstrapUtils - Instantiating CacheAwareContextLoaderDelegate from class [org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate] 15:49:55.343 [main] DEBUG org.springframework.test.context.BootstrapUtils - Instantiating BootstrapContext using constructor [public org.springframework.test.context.support.DefaultBootstrapContext(java.lang.Class,org.springframework.test.context.CacheAwareContextLoaderDelegate)] 15:49:55.365 [main] DEBUG org.springframework.test.context.BootstrapUtils - Instantiating TestContextBootstrapper for test class [com.example.demo.SampleTest] from class [org.springframework.boot.test.context.SpringBootTestContextBootstrapper] 15:49:55.377 [main] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper - Neither @ContextConfiguration nor @ContextHierarchy found for test class [com.example.demo.SampleTest], using SpringBootContextLoader 15:49:55.380 [main] DEBUG org.springframework.test.context.support.AbstractContextLoader - Did not detect default resource location for test class [com.example.demo.SampleTest]: class path resource [com/example/demo/SampleTest-context.xml] does not exist 15:49:55.381 [main] DEBUG org.springframework.test.context.support.AbstractContextLoader - Did not detect default resource location for test class [com.example.demo.SampleTest]: class path resource [com/example/demo/SampleTestContext.groovy] does not exist 15:49:55.381 [main] INFO org.springframework.test.context.support.AbstractContextLoader - Could not detect default resource locations for test class [com.example.demo.SampleTest]: no resource found for suffixes {-context.xml, Context.groovy}. 15:49:55.382 [main] INFO org.springframework.test.context.support.AnnotationConfigContextLoaderUtils - Could not detect default configuration classes for test class [com.example.demo.SampleTest]: SampleTest does not declare any static, non-private, non-final, nested classes annotated with @Configuration. 15:49:55.414 [main] DEBUG org.springframework.test.context.support.ActiveProfilesUtils - Could not find an 'annotation declaring class' for annotation type [org.springframework.test.context.ActiveProfiles] and class [com.example.demo.SampleTest] 15:49:55.468 [main] DEBUG org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider - Identified candidate component class: file [D:\Code\Learn\SpringBoot\springboot-mybatis-plus\target\classes\com\example\demo\SpringbootMybatisPlusApplication.class] 15:49:55.469 [main] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper - Found @SpringBootConfiguration com.example.demo.SpringbootMybatisPlusApplication for test class com.example.demo.SampleTest 15:49:55.547 [main] DEBUG org.springframework.boot.test.context.SpringBootTestContextBootstrapper - @TestExecutionListeners is not present for class [com.example.demo.SampleTest]: using defaults. 15:49:55.547 [main] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper - Loaded default TestExecutionListener class names from location [META-INF/spring.factories]: [org.springframework.boot.test.mock.mockito.MockitoTestExecutionListener, org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener, org.springframework.boot.test.autoconfigure.restdocs.RestDocsTestExecutionListener, org.springframework.boot.test.autoconfigure.web.client.MockRestServiceServerResetTestExecutionListener, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcPrintOnlyOnFailureTestExecutionListener, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverTestExecutionListener, org.springframework.boot.test.autoconfigure.webservices.client.MockWebServiceServerTestExecutionListener, org.springframework.test.context.web.ServletTestExecutionListener, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener, org.springframework.test.context.support.DependencyInjectionTestExecutionListener, org.springframework.test.context.support.DirtiesContextTestExecutionListener, org.springframework.test.context.transaction.TransactionalTestExecutionListener, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener, org.springframework.test.context.event.EventPublishingTestExecutionListener] 15:49:55.561 [main] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper - Using TestExecutionListeners: [org.springframework.test.context.web.ServletTestExecutionListener@54bff557, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener@593aaf41, org.springframework.boot.test.mock.mockito.MockitoTestExecutionListener@5a56cdac, org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener@7c711375, org.springframework.test.context.support.DirtiesContextTestExecutionListener@57cf54e1, org.springframework.test.context.transaction.TransactionalTestExecutionListener@5b03b9fe, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener@37d4349f, org.springframework.test.context.event.EventPublishingTestExecutionListener@434a63ab, org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener@6e0f5f7f, org.springframework.boot.test.autoconfigure.restdocs.RestDocsTestExecutionListener@2805d709, org.springframework.boot.test.autoconfigure.web.client.MockRestServiceServerResetTestExecutionListener@3ee37e5a, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcPrintOnlyOnFailureTestExecutionListener@2ea41516, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverTestExecutionListener@3a44431a, org.springframework.boot.test.autoconfigure.webservices.client.MockWebServiceServerTestExecutionListener@3c7f66c4] 15:49:55.564 [main] DEBUG org.springframework.test.context.support.AbstractDirtiesContextTestExecutionListener - Before test class: context [DefaultTestContext@550dbc7a testClass = SampleTest, testInstance = [null], testMethod = [null], testException = [null], mergedContextConfiguration = [WebMergedContextConfiguration@21282ed8 testClass = SampleTest, locations = '{}', classes = '{class com.example.demo.SpringbootMybatisPlusApplication}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@2f112965, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@d4342c2, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@1f0f1111, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@47d90b9e, org.springframework.boot.test.context.SpringBootTestArgs@1], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true]], class annotated with @DirtiesContext [false] with mode [null]. 15:49:55.589 [main] DEBUG org.springframework.test.context.support.TestPropertySourceUtils - Adding inlined properties to environment: {spring.jmx.enabled=false, org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true} . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.3.1.RELEASE) 2020-07-01 15:49:55.873 INFO 15452 --- [ main] com.example.demo.SampleTest : Starting SampleTest on yuwen-asiainfo with PID 15452 (started by yuwen in D:\Code\Learn\SpringBoot\springboot-mybatis-plus) 2020-07-01 15:49:55.874 INFO 15452 --- [ main] com.example.demo.SampleTest : No active profile set, falling back to default profiles: default 2020-07-01 15:49:56.907 INFO 15452 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor' _ _ |_ _ _|_. ___ _ | _ | | |\/|_)(_| | |_\ |_)||_|_\ / | 3.3.2 2020-07-01 15:49:58.403 INFO 15452 --- [ main] com.example.demo.SampleTest : Started SampleTest in 2.806 seconds (JVM running for 3.564) ----- selectAll method test ------ 2020-07-01 15:49:58.602 INFO 15452 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting... 2020-07-01 15:49:58.741 INFO 15452 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed. User [id=1, name=Jone, age=18, email=test1@baomidou.com] User [id=2, name=Jack, age=20, email=test2@baomidou.com] User [id=3, name=Tom, age=28, email=test3@baomidou.com] User [id=4, name=Sandy, age=21, email=test4@baomidou.com] User [id=5, name=Billie, age=24, email=test5@baomidou.com] 2020-07-01 15:49:58.791 INFO 15452 --- [extShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated... 2020-07-01 15:49:58.796 INFO 15452 --- [extShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed. 2020-07-01 15:49:58.797 INFO 15452 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'MyBatis-Plus 的官方快速开始文档 MyBatis-Plus 的官方示例工程
