Spring Boot Filesystemwatcher Example | Spring Boot File Download Controller Examples 인기 답변 업데이트

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d여기에서 Spring Boot File Download Controller Examples – spring boot filesystemwatcher example 주제에 대한 세부정보를 참조하세요

Learn how to code file download functionality for a Spring Boot web application, with different scenarios:
– Download a file that is stored on the server’s file system.
– Download a file that is stored in MySQL database
– Download a generated CSV file
I’ll show you step by step of coding file download handler methods in a Spring MVC controller class.
Technologies:
– Spring Boot Web
– Spring Data JPA \u0026 Hibernate
– Thymeleaf
– MySQL JDBC driver
Software programs:
– Java Development Kit (OpenJDK)
– Spring Tool Suite IDE (STS)
– MySQL database server

spring boot filesystemwatcher example 주제에 대한 자세한 내용은 여기를 참조하세요.

FileSystemWatcher (Spring Boot 2.7.2 API)

Create a new FileSystemWatcher instance. Parameters: daemon – if a daemon thread used to monitor changes: pollInterval – the amount of time to …

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Source: docs.spring.io

Date Published: 9/3/2021

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Monitor Folder Or Directory In Spring Boot | by Jayant Kokitkar

Sometimes we need to monitor a directory for changing,adding or deleting files in a given directory. Spring Boot proves “spring-boot-devtools” …

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Source: medium.com

Date Published: 12/9/2021

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org.springframework.boot.devtools.filewatch … – Tabnine

Best Java code snippets using org.springframework.boot.devtools.filewatch.FileSystemWatcher (Showing top 15 results out of 315).

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Source: www.tabnine.com

Date Published: 3/29/2021

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How to monitor folder/directory in spring? – java – Stack Overflow

spring-boot-devtools has FileSystemWatcher org.springframework.boot …

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Source: stackoverflow.com

Date Published: 10/10/2021

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spring-boot/FileSystemWatcher.java at main – GitHub

spring-boot/spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/filewatch/FileSystemWatcher.java.

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Source: github.com

Date Published: 6/24/2022

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FileSystemWatcher.java example – Javatips.net

This describes the usage of FileSystemWatcher.java. … Explorer. spring-boot-master. spring-boot. src. main. java. org. springframework. boot.

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Source: www.javatips.net

Date Published: 6/28/2021

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How to monitor folder/directory in spring? – 程序员的小窝

I wan’t to write Spring Boot Application in spring which will be monitoring directory in windows, and when I change sub folder or add new …

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Source: www.javawenti.com

Date Published: 8/7/2022

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A Guide to WatchService in Java NIO2 – Baeldung

Get started with Spring 5 and Spring Boot 2, through the Learn … A common example to understand what the service does is actually the IDE.

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Source: www.baeldung.com

Date Published: 1/15/2021

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org.springframework.boot.devtools.filewatch.FileSystemWatcher

Java code examples for org.springframework.boot.devtools.filewatch.FileSystemWatcher. Learn how to use java api org.springframework.boot.devtools.filewatch.

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Source: programtalk.com

Date Published: 2/29/2021

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org.springframework.boot.devtools.filewatch.ChangedFiles

Examples with ChangedFiles used on opensource projects org.springframework.boot.devtools.filewatch.ChangedFiles.

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Source: useof.org

Date Published: 3/28/2022

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주제와 관련된 이미지 spring boot filesystemwatcher example

주제와 관련된 더 많은 사진을 참조하십시오 Spring Boot File Download Controller Examples. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.

Spring Boot File Download Controller Examples
Spring Boot File Download Controller Examples

주제에 대한 기사 평가 spring boot filesystemwatcher example

  • Author: Code Java
  • Views: 조회수 7,038회
  • Likes: 좋아요 131개
  • Date Published: 2021. 3. 29.
  • Video Url link: https://www.youtube.com/watch?v=VQYMb6gerOs

org.springframework.boot.devtools.filewatch.FileSystemWatcher java code examples

public void start() { synchronized ( this .monitor) { saveInitialSnapshots (); if ( this .watchThread == null) { Map localFolders = new HashMap<>(); localFolders.putAll( this .folders); this .watchThread = new Thread( new Watcher( this .remainingScans, new ArrayList<>( this .listeners), this .triggerFilter, this .pollInterval, this .quietPeriod, localFolders)); this .watchThread.setName( “File Watcher” ); this .watchThread.setDaemon( this .daemon); this .watchThread.start(); } } }

How to monitor folder/directory in spring?

I wan’t to write Spring Boot Application in spring which will be monitoring directory in windows, and when I change sub folder or add new one or delete existing one I wanna get information about that.

How can i do that? I have read this one: http://docs.spring.io/spring-integration/reference/html/files.html and each result under ‘spring file watcher’ in google, but I can’t find solution…

Do you have a good article or example with something like this? I wan’t it to like like this:

@SpringBootApplication @EnableIntegration public class SpringApp{ public static void main(String[] args) { SpringApplication.run(SpringApp.class, args); } @Bean public WatchService watcherService() { …//define WatchService here } }

Regards

spring-boot/FileSystemWatcher.java at main · spring-projects/spring-boot

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FileSystemWatcher.java example

/* * Copyright 2012-2017 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the “License”); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an “AS IS” BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.boot.devtools.filewatch; import java.io.File; import java.io.FileFilter; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.LinkedHashMap; import java.util.LinkedHashSet; import java.util.List; import java.util.Map; import java.util.Set; import java.util.concurrent.atomic.AtomicInteger; import org.springframework.util.Assert; /** * Watches specific folders for file changes. * * @author Andy Clement * @author Phillip Webb * @since 1.3.0 * @see FileChangeListener */ public class FileSystemWatcher { private static final long DEFAULT_POLL_INTERVAL = 1000; private static final long DEFAULT_QUIET_PERIOD = 400; private final List listeners = new ArrayList<>(); private final boolean daemon; private final long pollInterval; private final long quietPeriod; private final AtomicInteger remainingScans = new AtomicInteger(-1); private final Map folders = new HashMap<>(); private Thread watchThread; private FileFilter triggerFilter; private final Object monitor = new Object(); /** * Create a new {@link FileSystemWatcher} instance. */ public FileSystemWatcher() { this(true, DEFAULT_POLL_INTERVAL, DEFAULT_QUIET_PERIOD); } /** * Create a new {@link FileSystemWatcher} instance. * @param daemon if a daemon thread used to monitor changes * @param pollInterval the amount of time to wait between checking for changes * @param quietPeriod the amount of time required after a change has been detected to * ensure that updates have completed */ public FileSystemWatcher(boolean daemon, long pollInterval, long quietPeriod) { Assert.isTrue(pollInterval > 0, “PollInterval must be positive”); Assert.isTrue(quietPeriod > 0, “QuietPeriod must be positive”); Assert.isTrue(pollInterval > quietPeriod, “PollInterval must be greater than QuietPeriod”); this.daemon = daemon; this.pollInterval = pollInterval; this.quietPeriod = quietPeriod; } /** * Add listener for file change events. Cannot be called after the watcher has been * {@link #start() started}. * @param fileChangeListener the listener to add */ public void addListener(FileChangeListener fileChangeListener) { Assert.notNull(fileChangeListener, “FileChangeListener must not be null”); synchronized (this.monitor) { checkNotStarted(); this.listeners.add(fileChangeListener); } } /** * Add source folders to monitor. Cannot be called after the watcher has been * {@link #start() started}. * @param folders the folders to monitor */ public void addSourceFolders(Iterable folders) { Assert.notNull(folders, “Folders must not be null”); synchronized (this.monitor) { for (File folder : folders) { addSourceFolder(folder); } } } /** * Add a source folder to monitor. Cannot be called after the watcher has been * {@link #start() started}. * @param folder the folder to monitor */ public void addSourceFolder(File folder) { Assert.notNull(folder, “Folder must not be null”); Assert.isTrue(folder.isDirectory(), “Folder ‘” + folder + “‘ must exist and must” + ” be a directory”); synchronized (this.monitor) { checkNotStarted(); this.folders.put(folder, null); } } /** * Set an optional {@link FileFilter} used to limit the files that trigger a change. * @param triggerFilter a trigger filter or null */ public void setTriggerFilter(FileFilter triggerFilter) { synchronized (this.monitor) { this.triggerFilter = triggerFilter; } } private void checkNotStarted() { synchronized (this.monitor) { Assert.state(this.watchThread == null, “FileSystemWatcher already started”); } } /** * Start monitoring the source folder for changes. */ public void start() { synchronized (this.monitor) { saveInitialSnapshots(); if (this.watchThread == null) { Map localFolders = new HashMap<>(); localFolders.putAll(this.folders); this.watchThread = new Thread(new Watcher(this.remainingScans, new ArrayList<>(this.listeners), this.triggerFilter, this.pollInterval, this.quietPeriod, localFolders)); this.watchThread.setName(“File Watcher”); this.watchThread.setDaemon(this.daemon); this.watchThread.start(); } } } private void saveInitialSnapshots() { for (File folder : this.folders.keySet()) { this.folders.put(folder, new FolderSnapshot(folder)); } } /** * Stop monitoring the source folders. */ public void stop() { stopAfter(0); } /** * Stop monitoring the source folders. * @param remainingScans the number of remaining scans */ void stopAfter(int remainingScans) { synchronized (this.monitor) { Thread thread = this.watchThread; if (thread != null) { this.remainingScans.set(remainingScans); if (remainingScans <= 0) { thread.interrupt(); } if (Thread.currentThread() != thread) { try { thread.join(); } catch (InterruptedException ex) { Thread.currentThread().interrupt(); } } this.watchThread = null; } } } private static final class Watcher implements Runnable { private final AtomicInteger remainingScans; private final List listeners; private final FileFilter triggerFilter; private final long pollInterval; private final long quietPeriod; private Map folders; private Watcher(AtomicInteger remainingScans, List listeners, FileFilter triggerFilter, long pollInterval, long quietPeriod, Map folders) { this.remainingScans = remainingScans; this.listeners = listeners; this.triggerFilter = triggerFilter; this.pollInterval = pollInterval; this.quietPeriod = quietPeriod; this.folders = folders; } @Override public void run() { int remainingScans = this.remainingScans.get(); while (remainingScans > 0 || remainingScans == -1) { try { if (remainingScans > 0) { this.remainingScans.decrementAndGet(); } scan(); } catch (InterruptedException ex) { Thread.currentThread().interrupt(); } remainingScans = this.remainingScans.get(); } }; private void scan() throws InterruptedException { Thread.sleep(this.pollInterval – this.quietPeriod); Map previous; Map current = this.folders; do { previous = current; current = getCurrentSnapshots(); Thread.sleep(this.quietPeriod); } while (isDifferent(previous, current)); if (isDifferent(this.folders, current)) { updateSnapshots(current.values()); } } private boolean isDifferent(Map previous, Map current) { if (!previous.keySet().equals(current.keySet())) { return true; } for (Map.Entry entry : previous.entrySet()) { FolderSnapshot previousFolder = entry.getValue(); FolderSnapshot currentFolder = current.get(entry.getKey()); if (!previousFolder.equals(currentFolder, this.triggerFilter)) { return true; } } return false; } private Map getCurrentSnapshots() { Map snapshots = new LinkedHashMap<>(); for (File folder : this.folders.keySet()) { snapshots.put(folder, new FolderSnapshot(folder)); } return snapshots; } private void updateSnapshots(Collection snapshots) { Map updated = new LinkedHashMap<>(); Set changeSet = new LinkedHashSet<>(); for (FolderSnapshot snapshot : snapshots) { FolderSnapshot previous = this.folders.get(snapshot.getFolder()); updated.put(snapshot.getFolder(), snapshot); ChangedFiles changedFiles = previous.getChangedFiles(snapshot, this.triggerFilter); if (!changedFiles.getFiles().isEmpty()) { changeSet.add(changedFiles); } } if (!changeSet.isEmpty()) { fireListeners(Collections.unmodifiableSet(changeSet)); } this.folders = updated; } private void fireListeners(Set changeSet) { for (FileChangeListener listener : this.listeners) { listener.onChange(changeSet); } } } }

How to monitor folder

I wan’t to write Spring Boot Application in spring which will be monitoring directory in windows, and when I change sub folder or add new one or delete existing one I wanna get information about that.

How can i do that? I have read this one: http://docs.spring.io/spring-integration/reference/html/files.html and each result under ‘spring file watcher’ in google, but I can’t find solution…

Do you have a good article or example with something like this? I wan’t it to like like this:

@SpringBootApplication @EnableIntegration public class SpringApp{ public static void main(String[] args) { SpringApplication.run(SpringApp.class, args); } @Bean public WatchService watcherService() { …//define WatchService here } }

Regards

A Guide To NIO2 WatchService

1. Overview

In this article, we are going to explore the WatchService interface of Java NIO.2 filesystem APIs. This is one of the lesser known features of the newer IO APIs that were introduced in Java 7 alongside FileVisitor interface.

To use the WatchService interface in your applications, you need to import the appropriate classes:

import java.nio.file.*;

2. Why Use WatchService

A common example to understand what the service does is actually the IDE.

You might have noticed that the IDEs always detects a change in source code files that happen outside itself. Some IDE’s inform you using a dialog box so that you can choose to reload the file from the filesystem or not, others simply update the file in the background.

Similarly, newer frameworks such as Play also does hot reloading of the application code by default – whenever you’re performing edits from any editor.

These applications employ a feature called file change notification that is available in all filesystems.

Basically, we can write code to poll the filesystem for changes on specific files and directories. However, this solution is not scalable especially if the files and directories reach the hundreds and thousands.

In Java 7 NIO.2, the WatchService API provides a scalable solution for monitoring directories for changes. It has a clean API and is so well optimized for performance that we don’t need to implement our own solution.

3. How Does the Watchservice Work?

To use the WatchService features, the first step is to create a WatchService instance using the java.nio.file.FileSystems class:

WatchService watchService = FileSystems.getDefault().newWatchService();

Next, we have to create the path to the directory we want to monitor:

Path path = Paths.get(“pathToDir”);

After this step, we have to register the path with watch service. There are two important concepts to understand at this stage. The StandardWatchEventKinds class and the WatchKey class. Take a look at the following registration code just to understand where each fall. We will follow this with explanations of the same:

WatchKey watchKey = path.register( watchService, StandardWatchEventKinds…);

Notice only two important things here: First, the path registration API call takes the watch service instance as the first parameter followed by variable arguments of StandardWatchEventKinds. Secondly, the return type of the registration process is a WatchKey instance.

3.1. The StandardWatchEventKinds

This is a class whose instances tell the watch service the kinds of events to watch for on the registered directory. There are currently four possible events to watch for:

StandardWatchEventKinds.ENTRY_CREATE – triggered when a new entry is made in the watched directory. It could be due to the creation of a new file or renaming of an existing file.

– triggered when a new entry is made in the watched directory. It could be due to the creation of a new file or renaming of an existing file. StandardWatchEventKinds.ENTRY_MODIFY – triggered when an existing entry in the watched directory is modified. All file edit’s trigger this event. On some platforms, even changing file attributes will trigger it.

– triggered when an existing entry in the watched directory is modified. All file edit’s trigger this event. On some platforms, even changing file attributes will trigger it. StandardWatchEventKinds.ENTRY_DELETE – triggered when an entry is deleted, moved or renamed in the watched directory.

– triggered when an entry is deleted, moved or renamed in the watched directory. StandardWatchEventKinds.OVERFLOW – triggered to indicate lost or discarded events. We won’t focus much on it

3.2. The WatchKey

This class represents the registration of a directory with the watch service. Its instance is returned to us by the watch service when we register a directory and when we ask the watch service if any events we registered for have occurred.

Watch service offers us no callback methods which are called whenever an event occurs. We can only poll it in a number of ways to find this information.

We can use the poll API:

WatchKey watchKey = watchService.poll();

This API call returns right away. It returns the next queued watch key any of whose events have occurred or null if no registered events have occurred.

We can also use an overloaded version that takes a timeout argument:

WatchKey watchKey = watchService.poll(long timeout, TimeUnit units);

This API call is similar to the previous one in return value. However, it blocks for timeout units of time to give more time within which an event may occur instead of returning null right away.

Finally, we can use the take API:

WatchKey watchKey = watchService.take();

This last approach simply blocks until an event occurs.

We must note something very important here: when the WatchKey instance is returned by either of the poll or take APIs, it will not capture more events if it’s reset API is not invoked:

watchKey.reset();

This means that the watch key instance is removed from the watch service queue every time it is returned by a poll operation. The reset API call puts it back in the queue to wait for more events.

The most practical application of the watcher service would require a loop within which we continuously check for changes in the watched directory and process accordingly. We can use the following idiom to implement this:

WatchKey key; while ((key = watchService.take()) != null) { for (WatchEvent event : key.pollEvents()) { //process } key.reset(); }

We create a watch key to store the return value of the poll operation. The while loop will block until the conditional statement returns with either a watch key or null.

When we get a watch key, then the while loop executes the code inside it. We use the WatchKey.pollEvents API to return a list of events that have occurred. We then use a for each loop to process them one by one.

After all the events are processed, we must call the reset API to enqueue the watch key again.

4. Directory Watching Example

Since we have covered the WatchService API in the previous subsection and how it works internally and also how we can use it, we can now go ahead and look at a complete and practical example.

For portability reasons, we are going to watch for activity in the user home directory, which should be available on all modern operating systems.

The code contains only a few lines of code so we will just keep it in the main method:

public class DirectoryWatcherExample { public static void main(String[] args) { WatchService watchService = FileSystems.getDefault().newWatchService(); Path path = Paths.get(System.getProperty(“user.home”)); 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(); } } }

And that is all we really have to do. Now you can run the class to start watching a directory.

When you navigate to the user home directory and perform any file manipulation activity like creating a file or directory, changing contents of a file or even deleting a file, it will all be logged at the console.

For instance, assuming you go to user home, right click in space, select `new – > file` to create a new file and then name it testFile. Then you add some content and save. The output at the console will look like this:

Event kind:ENTRY_CREATE. File affected: New Text Document.txt. Event kind:ENTRY_DELETE. File affected: New Text Document.txt. Event kind:ENTRY_CREATE. File affected: testFile.txt. Event kind:ENTRY_MODIFY. File affected: testFile.txt. Event kind:ENTRY_MODIFY. File affected: testFile.txt.

Feel free to edit the path to point to any directory you want to watch.

5. Conclusion

In this article, we have explored some of the less commonly used features available in the Java 7 NIO.2 – filesystem APIs, particularly the WatchService interface.

We have also managed to go through the steps of building a directory watching application to demonstrate the functionality.

And, as always, the full source code for the examples used in this article is available in the Github project.

Java bottom Get started with Spring 5 and Spring Boot 2, through the Learn Spring course: >> CHECK OUT THE COURSE

org.springframework.boot.devtools.filewatch.FileSystemWatcher Example

Here are the examples of the java api class org.springframework.boot.devtools.filewatch.FileSystemWatcher taken from open source projects.

1. FileWatchingFailureHandler#handle()

Source File: Project: spring-boot Source File: FileWatchingFailureHandler.java View license @Override public Outcome handle(Throwable failure) { CountDownLatch latch = new CountDownLatch(1); FileSystemWatcher watcher = this.fileSystemWatcherFactory.getFileSystemWatcher(); watcher.addSourceFolders(new ClassPathFolders(Restarter.getInstance().getInitialUrls())); watcher.addListener(new Listener(latch)); watcher.start(); try { latch.await(); } catch (InterruptedException ex) { } return Outcome.RETRY; }

org.springframework.boot.devtools.filewatch.ChangedFiles

private void testSendsEvent(boolean restart) { ClassPathFileChangeListener listener = new ClassPathFileChangeListener(this.eventPublisher, this.restartStrategy, this.fileSystemWatcher); File folder = new File(“s1”); File file = new File(“f1”); ChangedFile file1 = new ChangedFile(folder, file, ChangedFile.Type.ADD); ChangedFile file2 = new ChangedFile(folder, file, ChangedFile.Type.ADD); Set files = new LinkedHashSet<>(); files.add(file1); files.add(file2); ChangedFiles changedFiles = new ChangedFiles (new File(“source”), files); Set< ChangedFiles > changeSet = Collections.singleton(changedFiles); if (restart) { given(this.restartStrategy.isRestartRequired(file2)).willReturn(true); } listener.onChange(changeSet); verify(this.eventPublisher).publishEvent(this.eventCaptor.capture()); ClassPathChangedEvent actualEvent = (ClassPathChangedEvent) this.eventCaptor.getValue(); assertThat(actualEvent.getChangeSet()).isEqualTo(changeSet); assertThat(actualEvent.isRestartRequired()).isEqualTo(restart); }

키워드에 대한 정보 spring boot filesystemwatcher example

다음은 Bing에서 spring boot filesystemwatcher example 주제에 대한 검색 결과입니다. 필요한 경우 더 읽을 수 있습니다.

이 기사는 인터넷의 다양한 출처에서 편집되었습니다. 이 기사가 유용했기를 바랍니다. 이 기사가 유용하다고 생각되면 공유하십시오. 매우 감사합니다!

사람들이 주제에 대해 자주 검색하는 키워드 Spring Boot File Download Controller Examples

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  • Spring Boot file download controller
  • spring boot download file from server
  • spring boot csv file download example
  • download file in Spring Boot

Spring #Boot #File #Download #Controller #Examples

YouTube에서 spring boot filesystemwatcher example 주제의 다른 동영상 보기

주제에 대한 기사를 시청해 주셔서 감사합니다 Spring Boot File Download Controller Examples | spring boot filesystemwatcher example, 이 기사가 유용하다고 생각되면 공유하십시오, 매우 감사합니다.

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