SpringBoot项目动态加载jar 实战级别

news2025/4/19 16:37:53

网上也找到类似的文章，但是基本都不到实用级别，就是不能直接用。在参照网上的文章及与AI沟通N次后终于完善可以在实际项目上

创建jar文件动态加载类


@Component
@Slf4j
public class PluginRegistry {

    @Autowired
    private GenericApplicationContext applicationContext;

    @Autowired
    private RequestMappingHandlerMapping requestMappingHandlerMapping;

    private final Map<String, URLClassLoader> loaders = new ConcurrentHashMap<>();

    public void loadPlugin(String jarPath) throws Exception {
        // 将 JAR 文件转换为 URL
        File jarFile = new File(jarPath);
        if (!jarFile.exists()) {
            throw new IllegalArgumentException("JAR file not found: " + jarPath);
        }
        URL jarUrl = jarFile.toURI().toURL();
        URLClassLoader classLoader = new URLClassLoader(
                new URL[]{jarUrl},
                Thread.currentThread().getContextClassLoader()
        );
        Thread.currentThread().setContextClassLoader(classLoader);

        ClassPathScanningCandidateComponentProvider scanner =
                new ClassPathScanningCandidateComponentProvider(false);
        scanner.addIncludeFilter(new AnnotationTypeFilter(Component.class));

        Set<BeanDefinition> candidateComponents =
                scanner.findCandidateComponents("com.snail.model"); // 替换为目标包路径

        // 注册扫描到的 Controller 到 Spring 容器
        BeanDefinitionRegistry registry = (BeanDefinitionRegistry) applicationContext.getAutowireCapableBeanFactory();
        for (org.springframework.beans.factory.config.BeanDefinition bd : candidateComponents) {
            String className = bd.getBeanClassName();
            Class<?> clazz = classLoader.loadClass(className);
            applicationContext.registerBean(clazz);
        }
        requestMappingHandlerMapping.afterPropertiesSet();
        log.info("加载插件成功{}",requestMappingHandlerMapping.getHandlerMethods().size());
        loaders.put(jarPath, classLoader);
    }
}