init

.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>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.5.4</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>com.plugin</groupId>
+    <artifactId>SpringBootPluginTest</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>SpringBootPluginTest</name>
+    <description>Demo project for Spring Boot</description>
+    <properties>
+        <java.version>1.8</java.version>
+        <hutool.version>5.7.12</hutool.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>
+        </dependency>
+
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-all</artifactId>
+            <version>${hutool.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/main/java/com/plugin/springbootplugintest/SpringBootPluginTestApplication.java

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+package com.plugin.springbootplugintest;
+
+import com.plugin.springbootplugintest.config.PluginImportBeanDefinitionRegistrar;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Import;
+
+@SpringBootApplication
+@Import(PluginImportBeanDefinitionRegistrar.class)
+public class SpringBootPluginTestApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringBootPluginTestApplication.class, args);
+    }
+}

src/main/java/com/plugin/springbootplugintest/config/PluginImportBeanDefinitionRegistrar.java

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+package com.plugin.springbootplugintest.config;
+
+import lombok.SneakyThrows;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.support.BeanDefinitionBuilder;
+import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.context.EnvironmentAware;
+import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
+import org.springframework.core.env.Environment;
+import org.springframework.core.type.AnnotationMetadata;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+
+/**
+ * 插件类注册bean
+ *
+ * @author zlt
+ * @version 1.0
+ * @date 2021/9/14
+ * <p>
+ * Blog: https://zlt2000.gitee.io
+ * Github: https://github.com/zlt2000
+ */
+@Slf4j
+public class PluginImportBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar, EnvironmentAware {
+    /**
+     * jar的地址
+     */
+    private String targetUrl;
+    /**
+     * 插件类全路径
+     */
+    private String pluginClass;
+
+    @SneakyThrows
+    @Override
+    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
+        ClassLoader classLoader = getClassLoader(targetUrl);
+        Class<?> clazz = classLoader.loadClass(pluginClass);
+
+        BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(clazz);
+        BeanDefinition beanDefinition = builder.getBeanDefinition();
+
+        registry.registerBeanDefinition(clazz.getSimpleName(), beanDefinition);
+    }
+
+    private ClassLoader getClassLoader(String url) {
+        try {
+            return new URLClassLoader(new URL[] {new URL(url)});
+        } catch (Exception e) {
+            log.error("getClassLoader-error", e);
+            return null;
+        }
+    }
+
+    @Override
+    public void setEnvironment(Environment environment) {
+        this.targetUrl = environment.getProperty("targetUrl");
+        this.pluginClass = environment.getProperty("pluginClass");
+    }
+}

src/main/java/com/plugin/springbootplugintest/controller/TestController.java

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+package com.plugin.springbootplugintest.controller;
+
+import org.apache.catalina.core.ApplicationContext;
+import plugin.PluginInterface;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * TODO
+ *
+ * @author zlt
+ * @version 1.0
+ * @date 2021/9/13
+ * <p>
+ * Blog: https://zlt2000.gitee.io
+ * Github: https://github.com/zlt2000
+ */
+@RestController
+public class TestController {
+    @Autowired(required = false)
+    private PluginInterface pluginInterface;
+
+    @GetMapping("/test")
+    public String test() {
+        return pluginInterface.sayHello("test plugin");
+    }
+
+    @GetMapping("/reload")
+    public String reload(@Autowired ApplicationContext applicationContext) {
+        ()applicationContext;
+        return pluginInterface.sayHello("test plugin");
+    }
+}

src/main/java/plugin/PluginInterface.java

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+package plugin;
+
+public interface PluginInterface {
+    String sayHello(String name);
+}

src/main/resources/application.properties

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+targetUrl=file:/D:/workspaces/projects/SpringBootPluginTest/plugins/plugindemo-1.0.jar
+pluginClass=plugin.PluginImpl

src/test/java/com/plugin/springbootplugintest/SpringBootPluginTestApplicationTests.java

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