初始化项目，编写简单逻辑

.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:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         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.julylies</groupId>
+    <artifactId>webservicemonitor</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>webservicemonitor</name>
+    <description>webservicemonitor</description>
+    <properties>
+        <java.version>1.8</java.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <spring-boot.version>2.3.12.RELEASE</spring-boot.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </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>
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-dependencies</artifactId>
+                <version>${spring-boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                    <encoding>UTF-8</encoding>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>${spring-boot.version}</version>
+                <configuration>
+                    <mainClass>com.julylies.webservicemonitor.WebservicemonitorApplication</mainClass>
+                    <skip>true</skip>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>repackage</id>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/main/java/com/julylies/webservicemonitor/WebservicemonitorApplication.java

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+package com.julylies.webservicemonitor;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableScheduling;
+
+/**
+ * @author JulyLies
+ * @version 1.0
+ * @since 2023/7/20 07:33
+ */
+@EnableScheduling
+@SpringBootApplication
+public class WebservicemonitorApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(WebservicemonitorApplication.class, args);
+    }
+
+}

src/main/java/com/julylies/webservicemonitor/utils/CheckWebSerVice.java

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+package com.julylies.webservicemonitor.utils;
+
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * @author JulyLies
+ * @version 1.0
+ * @since 2023/7/20 07:35
+ */
+@Component
+public class CheckWebSerVice {
+    private static final String TARGET_URL = "https://joplin.huangdf.xyz";
+
+    private final RestTemplate restTemplate;
+
+    public CheckWebSerVice() {
+        this.restTemplate = new RestTemplate();
+    }
+
+    /**
+     * 每5分种执行一次检查
+     */
+    @Scheduled(fixedRate = 300000)
+    public void checkWebServiceStatus() {
+        try {
+            restTemplate.getForEntity(TARGET_URL, String.class);
+            System.out.println("Web服务正常运行中");
+        } catch (Exception e) {
+            System.err.println("Web服务挂掉了！" + e.getMessage());
+            // TODO: 发送通知短信
+        }
+    }
+}

src/main/resources/application.properties

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+# 应用服务 WEB 访问端口
+server.port=8080
+

src/test/java/com/julylies/webservicemonitor/WebservicemonitorApplicationTests.java

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