问题描述
我有一个想要监视目录的简单应用程序，到目前为止，我使用WatchService类的方法是这样：
ApplicationClass：
@SpringBootApplication
public class MmsdirectorywatcherApplication {
public static void main(String[] args) {
SpringApplication.run(MmsdirectorywatcherApplication.class,args);
}
@Autowired
DirectoryWatcher directoryWatcher;
@Bean
public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
return args -> {
directoryWatcher.startWatching();
};
}
}
DirectoryWatcher：
@Component
public class DirectoryWatcher {
WatchService watchService;
Path path;
private String watcherDiretory;
public DirectoryWatcher() {
}
@Value("${mms.directorywatcher.directory}")
public void setWatcherDiretory(String watcherDiretory) {
this.watcherDiretory = watcherDiretory;
}
public void startWatching(){
path = Paths.get(watcherDiretory);
try{
watchService
= FileSystems.getDefault().newWatchService();
path.register(
watchService,StandardWatchEventKinds.ENTRY_CREATE,StandardWatchEventKinds.ENTRY_DELETE,StandardWatchEventKinds.ENTRY_MODIFY);
WatchKey key;
while ((key = watchService.take()) != null) {
for (WatchEvent<?> event : key.pollEvents()) {
System.out.println(
"Event kind:" + event.kind()
+ ". File affected: " + event.context() + ".");
}
key.reset();
}
}
catch (IOException ex){
}
catch (InterruptedException ex){
}
}
}
运行正常，但是我想测试一下applicationstarted是否正确，这是测试：
@SpringBoottest(classes = {MmsdirectorywatcherApplication.class})
class MmsdirectorywatcherApplicationTests {
@Autowired
private DirectoryWatcher directoryWatcher;
@Test
void contextLoads() {
assertNotNull(directoryWatcher);
}
}
当我运行测试时，它似乎卡住了，好像有什么东西阻止它完成。可能是watchService本身，但是我不确定如何解决此问题，因为我确实想最终测试是否调用了startWatching。
感谢您的时间
解决方法
您的上下文开始调用startWatching()，该函数永不返回。请注意，watchService.take()会一直阻止，直到事件进入。