Springboot集成jersey打包jar找不到class处理

环境 java17 + springboot 3.x

如题，简单来说，jersey官方希望用户通过 register 的方式，将所有的资源类注册到jersey中，但是，一般开发中，可能定义了N个Resource类，一个一个的加入，太麻烦，也可能遗漏，解决方案就是，写个方法，扫描到resource包下的所有资源类，然后 register 到jersey中

特别注意，是 registerClasses 方法，不是 register 方法

以下两种方法

1. 使用java自带的扫描
   1.1 核心代码

import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.util.ClassUtils;import java.io.IOException;
import java.util.HashSet;
import java.util.Set;@Slf4j
public class ClassUtil {/*** 由于spring boot 打包为jar包，jersey packages 无法扫描jar对应的文件夹的文件，故自定义包扫描** @return class[]*/public static Set<Class<?>> findAllClasses(String... scanPackages) {Set<Class<?>> classes = new HashSet<>();for (String scanPackage : scanPackages) {ClassLoader loader = ClassUtil.class.getClassLoader();Resource[] resources = new Resource[0];try {resources = scan(loader, scanPackage);} catch (IOException e) {log.error("加载class异常", e);}classes.addAll(convert(loader, resources));}return classes;}/*** 扫描 jar 包** @param loader      ClassLoader* @param packageName packageName*/private static Resource[] scan(ClassLoader loader, String packageName) throws IOException {ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(loader);String pattern = "classpath*:" + ClassUtils.convertClassNameToResourcePath(packageName) + "/*.class";return resolver.getResources(pattern);}/*** 加载 class** @param loader   ClassLoader* @param resource resource*/private static Class<?> loadClass(ClassLoader loader, Resource resource) {try {CachingMetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(loader);MetadataReader reader = metadataReaderFactory.getMetadataReader(resource);return ClassUtils.forName(reader.getClassMetadata().getClassName(), loader);} catch (LinkageError | ClassNotFoundException e) {if (log.isDebugEnabled()) {log.debug("Ignoring candidate class resource " + resource + " due to " + e);}return null;} catch (Throwable e) {if (log.isWarnEnabled()) {log.warn("Unexpected failure when loading class resource " + resource, e);}return null;}}/*** resources 转换为 Set<Class>** @param loader    ClassLoader* @param resources Resource*/private static Set<Class<?>> convert(ClassLoader loader, Resource[] resources) {Set<Class<?>> classSet = new HashSet<>(resources.length);for (Resource resource : resources) {Class<?> clazz = loadClass(loader, resource);if (clazz != null) {classSet.add(clazz);}}return classSet;}}

1.2 使用

@Configuration
public class JerseyConfig extends ResourceConfig {public JerseyConfig() {// 注册包扫描 这个方法在开发使用没问题，但是打包jar后，找不到 class 文件
//        packages("com.xxx.xxx.api");// 定义扫描包含接口资源包registerClasses(ClassUtil.findAllClasses("com.xxx.xxx.api"));}
}

2. 使用JerseyScan
   2.1 核心代码
   注意中间的 scanner.addIncludeFilter(new AnnotationTypeFilter(Path.class)); 这一行代码！！！

public class JerseyServiceAutoScanner {private JerseyServiceAutoScanner() {}public static Class[] getPublishJerseyServiceClasses(ApplicationContext context, String... scanPackages) {// 传入applicationContext对象，在整个spring容器中捞我们需要的controller// 传入的第二个参数是可变参数，字符串，用于传入需要扫描的包路径List<Class> jerseyServiceClasses = new ArrayList<>();if (scanPackages == null || scanPackages.length == 0) {return jerseyServiceClasses.toArray(new Class[jerseyServiceClasses.size()]);}ClassPathScanningCandidateComponentProvider scanner = new JerseyScanningComponentProvider(false);// 我只需要扫描使用了@Path注解的controller，如果还有其他的组合条件，可以在这里增加scanner.addIncludeFilter(new AnnotationTypeFilter(Path.class));for (var scanPackage : scanPackages) {jerseyServiceClasses.addAll(scanner.findCandidateComponents(scanPackage).stream().map(beanDefinition -> ClassUtils.resolveClassName(beanDefinition.getBeanClassName(), applicationContext.getClassLoader())).collect(Collectors.toSet()));}// 返回符合条件的spring容器中的全部的类对象return jerseyServiceClasses.toArray(new Class[jerseyServiceClasses.size()]);}private static class JerseyScanningComponentProvider extends ClassPathScanningCandidateComponentProvider {public JerseyScanningComponentProvider(boolean useDefaultFilters) {super(useDefaultFilters);}@Overrideprotected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {AnnotationMetadata metadata = beanDefinition.getMetadata();// 注意这里的值，最好debug一下，我使用的时候，只有第一个metadata.isIndependent()是truereturn (metadata.isIndependent() && metadata.isAbstract() && !beanDefinition.getMetadata().isAnnotation());}}
}

2.2 引用

@Configuration
public class JerseyConfig extends ResourceConfig implements ApplicationContextAware {private ApplicationContext applicationContext;@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {this.applicationContext = applicationContext;}@PostConstructpublic void init() {registerClasses(JerseyServiceAutoScanner.getPublishJerseyServiceClasses(applicationContext, "com.xxx.xxx.api"));}public JerseyConfig() {// 。。。 其他的 。。。}
}

完结！！！