chore: bootstrap Spring Boot application

.gitignore

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+target/
+.idea/
+.env
+*.log

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>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>4.1.0</version>
+        <relativePath/>
+    </parent>
+
+    <groupId>com.yau</groupId>
+    <artifactId>digital-rmb-backend</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>digital-rmb-backend</name>
+    <description>数字人民币教学仿真后端</description>
+
+    <properties>
+        <java.version>17</java.version>
+        <mybatis-plus.version>3.5.17</mybatis-plus.version>
+        <springdoc.version>3.0.3</springdoc.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-webmvc</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-security</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-flyway</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.flywaydb</groupId>
+            <artifactId>flyway-mysql</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.baomidou</groupId>
+            <artifactId>mybatis-plus-spring-boot4-starter</artifactId>
+            <version>${mybatis-plus.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springdoc</groupId>
+            <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
+            <version>${springdoc.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <parameters>true</parameters>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/com/yau/digitalrmb/DigitalRmbApplication.java

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

src/main/resources/application-test.yml

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+spring:
+  datasource:
+    url: jdbc:h2:mem:digital_rmb;MODE=MySQL;DB_CLOSE_DELAY=-1;DATABASE_TO_LOWER=TRUE
+    username: sa
+    password: ""
+    driver-class-name: org.h2.Driver
+  flyway:
+    enabled: true
+    locations: classpath:db/migration

src/main/resources/application.yml

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+spring:
+  application:
+    name: digital-rmb-backend
+  datasource:
+    url: ${DIGITAL_RMB_DB_URL}
+    username: ${DIGITAL_RMB_DB_USERNAME}
+    password: ${DIGITAL_RMB_DB_PASSWORD}
+    driver-class-name: com.mysql.cj.jdbc.Driver
+  flyway:
+    enabled: true
+    locations: classpath:db/migration

src/main/resources/db/migration/V0__baseline.sql

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+-- baseline

src/test/java/com/yau/digitalrmb/ApplicationContextTest.java

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+package com.yau.digitalrmb;
+
+import org.flywaydb.core.Flyway;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@ActiveProfiles("test")
+@SpringBootTest
+class ApplicationContextTest {
+
+    @Autowired
+    private Flyway flyway;
+
+    @Test
+    void baselineMigrationIsApplied() {
+        assertThat(flyway.info().applied()).hasSize(1);
+    }
+}