first

.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

pom.xml

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+<?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>
+    <groupId>com.example.course</groupId>
+    <artifactId>IM</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>IM</name>
+    <description>IM</description>
+    <properties>
+        <java.version>1.8</java.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+    </properties>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <version>2.3.2.RELEASE</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>2.3.2.RELEASE</version>
+        </dependency>
+
+        <!--     mysql -->
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.33</version>
+        </dependency>
+
+        <!--     mybatis-plus -->
+        <dependency>
+            <groupId>com.baomidou</groupId>
+            <artifactId>mybatis-plus-boot-starter</artifactId>
+            <version>3.5.4</version>
+        </dependency>
+
+        <!--     lombok -->
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.30</version>
+        </dependency>
+
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-all</artifactId>
+            <version>5.8.16</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+            <version>2.3.2.RELEASE</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>druid</artifactId>
+            <version>1.1.23</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.baomidou</groupId>
+            <artifactId>mybatis-plus-boot-starter</artifactId>
+            <version>3.4.1</version>
+        </dependency>
+
+        <!--        <dependency>-->
+        <!--            <groupId>io.minio</groupId>-->
+        <!--            <artifactId>minio</artifactId>-->
+        <!--            <version>7.1.0</version>-->
+        <!--        </dependency>-->
+
+        <dependency>
+            <groupId>io.jsonwebtoken</groupId>
+            <artifactId>jjwt</artifactId>
+            <version>0.9.1</version>
+        </dependency>
+
+        <!--    Redis-->
+        <!--        <dependency>-->
+        <!--            <groupId>org.springframework.boot</groupId>-->
+        <!--            <artifactId>spring-boot-starter-data-redis</artifactId>-->
+        <!--        </dependency>-->
+
+        <!--        切面-->
+        <!--        <dependency>-->
+        <!--            <groupId>org.aspectj</groupId>-->
+        <!--            <artifactId>aspectjweaver</artifactId>-->
+        <!--        </dependency>-->
+
+        <!--        okhttp-->
+<!--                <dependency>-->
+<!--                    <groupId>com.squareup.okhttp3</groupId>-->
+<!--                    <artifactId>okhttp</artifactId>-->
+<!--                </dependency>-->
+
+<!--                fastjson-->
+<!--                <dependency>-->
+<!--                    <groupId>com.alibaba</groupId>-->
+<!--                    <artifactId>fastjson</artifactId>-->
+<!--                    <version>1.2.80</version>-->
+<!--                </dependency>-->
+
+        <!--     commons-lang3   -->
+        <!--        <dependency>-->
+        <!--            <groupId>org.apache.commons</groupId>-->
+        <!--            <artifactId>commons-lang3</artifactId>-->
+        <!--        </dependency>-->
+
+        <!--        netty-all-->
+<!--                <dependency>-->
+<!--                    <groupId>io.netty</groupId>-->
+<!--                    <artifactId>netty-all</artifactId>-->
+<!--                </dependency>-->
+
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/main/java/com/example/course/ImApplication.java

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+package com.example.course;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class ImApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ImApplication.class, args);
+    }
+
+}

src/main/resources/application.yml

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+server:
+  port: 8080
+
+spring:
+  datasource:
+    driver-class-name: com.mysql.cj.jdbc.Driver
+    url: jdbc:mysql://47.111.97.7:3306/IM?useSSL=false&serverTimezone=UTC&characterEncoding=UTF-8
+    username: root
+    password: root
+mybatis-plus:
+  type-aliases-package: com.example.course
+  configuration:
+    map-underscore-to-camel-case: true
+    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
+  mapper-locations: classpath:mapper/*.xml
+logging:
+  level:
+    com:
+      example:
+        course: debug

src/test/java/com/example/course/ImApplicationTests.java

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+package com.example.course;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class ImApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}