springboot自定义包扫描路径

目标：
项目springboot-jpa需要使用项目zzc-test的controller类

解决方案：
springboot-jpa引入依赖zzc-test，并在springboot-jpa中使用spring的componentScan方法注册新的扫描包路径

项目结构

spring自定义包扫描路径

注册包路径扫描类

@Component
public class ComponentScanRegister implements BeanDefinitionRegistryPostProcessor, PriorityOrdered {
    @Override
    public int getOrder() {
        return PriorityOrdered.LOWEST_PRECEDENCE;
    }
    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
    }

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
    }
}

取需要扫描的包路径，注册到spring

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
        Set<String> packages =new HashSet<String>();
        String configFileLocation = "META-INF/framework/component-scan-include.txt";
        packages.addAll(getComponentScanList(configFileLocation));
        //最终提交给 spring
        if(packages!=null && packages.size()>0){
            ClassPathBeanDefinitionScanner scanner =new ClassPathBeanDefinitionScanner(registry);
            scanner.scan(packages.toArray(new String[]{}));
        }
    }读取配置文件

“META-INF/framework/component-scan-include.txt”
component-scan-include.txt：

com.demo.service.impl
com.demo.controller


    private List<String> getComponentScanList(String configFileLocation) {
        List<String> result =new ArrayList<String>();
        URL url =null;
        try {
            Enumeration<URL> urls =Thread.currentThread().getContextClassLoader().getResources(configFileLocation);
            if(urls!=null){
                while (urls.hasMoreElements()) {
                    url = urls.nextElement();
                    Resource resource =new UrlResource(url);
                    if(resource!=null && resource.exists()){
                        List<String> readLines = IOUtils.readLines(resource.getInputStream(), "utf-8");
                        result.addAll(readLines);
                    }
                }
                return result;
            }
        } catch (IOException e) {
            throw new RuntimeException("Error in configuration file : " + url,e);
        }
        return null;
    }