




dependencies:依赖关系
在pom.xml的dependencies中加入依赖关系
<!--mybaties-plus启动器-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.5.1</version>
</dependency>
<!--lombok用于简化实体类开发-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!--mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>这里要特别注意我们的springboot工程刚创建的时候是没有添加版本的,有爆红错误,Plugin 'org.springframework.boot:spring-boot-maven-plugin:' not found。

这里只需要加上和开头处和父类版本一样的version即可

然后我们对maven进行刷新,让其安装对应的依赖关系,直到这些爆红的错误消失为止,如果有的错误没有消失(但是我们IDEA中已经安装完了相应的依赖),这个时候我们最好进行重启一下IDEA。

首先区分properties文件和yml文件的不同
properties 使用‘.’来进行分隔
yml 使用‘:’来进行分隔
yml中的一些格式比properties的要求要高。

创建application.yml只需要复制application.properties粘贴到resources中然后修改文件名即可。
spring.datasource.type=com.zaxxer.hikari.HikariDataSource spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
了解一下配置application.properties
8.0版本以上的mysql需要引用的Driver是:
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
5.0版本以上的mysql需要引用的Driver是:
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
查看springboot使用的mysql版本需要在pom.xml中按ctrl打开mysql查看版本

application.yml配置

spring:
#配置数据源信息系
datasource:
#配置数据源类型
type: com.zaxxer.hikari.HikariDataSource
driver-class-name: com.mysql.cj.jdbc.Driver
#配置连接数据库的个人信息
url: jdbc:mysql://localhost:3306/mybatis_plus?serverTimezone=GMT%2B8&characterEncoding=utf-8&useSSL=false
username: root
password: abc123SpringBoot 版本低于2.4.3(不含),Mysql驱动版本大于8.0时,需要在url连接串中配置时区,否则会报错java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more
package com.atzeren.mybatiesplus;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MybatiesplusApplication {
public static void main(String[] args) {
SpringApplication.run(MybatiesplusApplication.class, args);
}
}c.创建实体类
package com.atzeren.mybatiesplus.pojo;
import lombok.*;
/**
* @Program:mybatiesplus
* @description:pojo
* @author: jiangzeren
* @create: 2022-11-01 16
**/
@Data
public class User {
private Long id;
private String name;
private Integer age;
private String email;
}打包出错
C:\Users\jiangzeren\.jdks\corretto-1.8.0_342\bin\java.exe -Dmaven.multiModuleProjectDirectory=D:\IDEAAA\mybatiesplus "-Dmaven.home=D:\IDEAAA\IntelliJ IDEA 2020.3.4\plugins\maven\lib\maven3" "-Dclassworlds.conf=D:\IDEAAA\IntelliJ IDEA 2020.3.4\plugins\maven\lib\maven3\bin\m2.conf" "-Dmaven.ext.class.path=D:\IDEAAA\IntelliJ IDEA 2020.3.4\plugins\maven\lib\maven-event-listener.jar" "-javaagent:D:\IDEAAA\IntelliJ IDEA 2020.3.4\lib\idea_rt.jar=56330:D:\IDEAAA\IntelliJ IDEA 2020.3.4\bin" -Dfile.encoding=GBK -classpath "D:\IDEAAA\IntelliJ IDEA 2020.3.4\plugins\maven\lib\maven3\boot\plexus-classworlds-2.6.0.jar;D:\IDEAAA\IntelliJ IDEA 2020.3.4\plugins\maven\lib\maven3\boot\plexus-classworlds.license" org.codehaus.classworlds.Launcher -Didea.version=2020.3.4 compile[INFO] Scanning for projects...[INFO] [INFO] ----------------------< com.atzeren:mybatiesplus >----------------------[INFO] Building mybatiesplus 0.0.1-SNAPSHOT[INFO] --------------------------------[ jar ]---------------------------------[WARNING] The artifact mysql:mysql-connector-java:jar:8.0.31 has been relocated to com.mysql:mysql-connector-j:jar:8.0.31[INFO] [INFO] --- maven-resources-plugin:3.2.0:resources (default-resources) @ mybatiesplus ---[INFO] Using 'UTF-8' encoding to copy filtered resources.[INFO] Using 'UTF-8' encoding to copy filtered properties files.[INFO] Copying 2 resources[INFO] ------------------------------------------------------------------------[INFO] BUILD FAILURE[INFO] ------------------------------------------------------------------------[INFO] Total time: 1.543 s[INFO] Finished at: 2022-11-01T16:20:17+08:00[INFO] ------------------------------------------------------------------------[ERROR] Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources (default-resources) on project mybatiesplus: Input length = 1 -> [Help 1][ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.[ERROR] Re-run Maven using the -X switch to enable full debug logging.[ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles:[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException Process finished with exit code 1

发现再次刷新maven之后运行成功了。

对比代码发现原来是java版本的问题,把java.version改为1.8即可。
<?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>2.7.5</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.atzeren</groupId>
<artifactId>mybatiesplus</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>mybatiesplus</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</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--mybaties-plus启动器-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.5.1</version>
</dependency>
<!--lombok用于简化实体类开发-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!--mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.7.5</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<!--修改版本-->
<version>3.1.0</version>
</plugin>
</plugins>
</build>
</project>这只是我遇到的问题,仅对我有效,如果你也是jdk版本默认设置为17或者18也可能会产生这个问题,为了验证是不是jdk产生的影响,我又重新将jdk版本设置为了17,发现仍然出现之前的情况。

正确方法打包之后get、set方法、构造器都会自动创建,,这样的话在实际开发过程中我们就不用这么麻烦了。

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