Common-io中FileAlterationListenerAdaptor監聽文件夾的變化

添加依賴

                <!-- apache commons io -->
		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
			<version>2.6</version>
		</dependency>

自定義繼承FileAlterationListenerAdaptor

import com.dream.user.restservice.controllers.UserController;
import org.apache.commons.io.monitor.FileAlterationListenerAdaptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;

/**
 * 監聽文件變動
 */
public class FileListenerAdaptor extends FileAlterationListenerAdaptor {

    private static final Logger logger = LoggerFactory.getLogger(FileListenerAdaptor.class);

    /**
     * File created Event.
     *
     * @param file The file created (ignored)
     */
    @Override
    public void onFileCreate(final File file) {
        logger.info("監聽{}創建",file.getName());
    }

    /**
     * File changed Event.
     *
     * @param file The file changed (ignored)
     */
    @Override
    public void onFileChange(final File file) {
        logger.info("監聽{}修改",file.getName());
    }

    /**
     * File deleted Event.
     *
     * @param file The file deleted (ignored)
     */
    @Override
    public void onFileDelete(final File file) {
        logger.info("監聽{}刪除",file.getName());
    }
}

實現spring的監聽事件ApplicationListener<ContextRefreshedEvent>

import org.apache.commons.io.monitor.FileAlterationMonitor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;

public class ContextRefreshedListener implements ApplicationListener<ContextRefreshedEvent> {

    @Autowired
    FileAlterationMonitor monitor;

    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        try {
            //開始監聽
            monitor.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

 

FileListenerConfig配置

import org.apache.commons.io.monitor.FileAlterationMonitor;
import org.apache.commons.io.monitor.FileAlterationObserver;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.util.ResourceUtils;

import java.io.File;

@Configuration
public class FileListenerConfig {

    @Bean
    public ContextRefreshedListener contextRefreshedListener() {
        return new ContextRefreshedListener();
    }

    @Bean
    public FileListenerAdaptor fileListener(){return new FileListenerAdaptor();}

    @Bean
    public FileAlterationMonitor fileMonitor(FileListenerAdaptor fileListener) throws Exception{
        FileAlterationMonitor fileMonitor = new FileAlterationMonitor();//默認是10s監聽一次

        //獲取絕對路徑
        Resource resource = new ClassPathResource("");
        String workPath = resource.getFile().getAbsolutePath();
        int index = workPath.indexOf("target");
        workPath = workPath.substring(0,index-1)+"/src/main/resources/";

        //指定觀察者監聽的目錄
        File file = ResourceUtils.getFile(workPath);
        //實例化觀察者
        FileAlterationObserver observer = new FileAlterationObserver(file);
        observer.addListener(fileListener);
        //監視器添加觀察者
        fileMonitor.addObserver(observer);
        return fileMonitor;
    }
}