Java使用執行緒池遞迴壓縮資料夾下面的所有子檔案

本文將介紹Java中利用執行緒池遞迴的方式壓縮資料夾下面的所有子檔案，具體方法如下：

Gzip單個檔案壓縮

對於單個檔案使用GZip壓縮。

package date0805.demo1;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.GZIPOutputStream;

public class GZipRunnable implements Runnable {

	private final File file;

	public GZipRunnable(File file) {
		this.file=file;
	}

	@Override
	public void run() {
		if(!file.getName().endsWith(".gz")) {
			File outputFile=new File(file.getParent(),file.getName()+".gz");
			if(!outputFile.exists()) {
				CountTime countTime = new CountTime(file);
				Thread t=new Thread(countTime);
				t.start();
				try(
					InputStream in =new BufferedInputStream(new FileInputStream(file));
					OutputStream out=new BufferedOutputStream(new GZIPOutputStream(new FileOutputStream(outputFile)));
				) {
					int b;
					while((b=in.read())!=-1)
						out.write(b);
					out.flush();
				} catch(Exception ex) {
					ex.printStackTrace();
				}
				t.interrupt();
			} else {
				System.out.println(outputFile+"檔案已經存在，無法壓縮!");
			}
		}
	}
}

建立執行緒池進行遞迴壓縮

要實現對一個資料夾下面的所有的子檔案進行壓縮，首先遞迴找出所有子檔案，然後呼叫壓縮執行緒進行壓縮。

package date0805.demo1;

import java.io.File;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class GZipFiles {

	private final static int THREAD_COUNT=4;
	private static ExecutorService service=Executors.newFixedThreadPool(THREAD_COUNT);
	public static void GZip(File fileArgs) {
		if(!fileArgs.isDirectory()) {
			GZipRunnable gZipRunnable = new GZipRunnable(fileArgs);
			service.submit(gZipRunnable);
		}
		else {
			File[] files = fileArgs.listFiles();
			for(File f:files) {
				GZip(f);
			}
		}
	}
	public static void shutdown() {
		service.shutdown();
	}
}

壓縮提示

package date0805.demo1;

import java.io.File;

public class CountTime implements Runnable {

	private File file;

	public CountTime(File file) {
		super();
		this.file = file;
	}

	@Override
	public void run() {
		System.out.println("正在壓縮"+file.getAbsolutePath());
		try {
			while(true) {
				System.out.print(".");
				Thread.sleep(1000);
			}
		}catch (InterruptedException e) {
			System.out.println();
			System.out.println(file.getAbsolutePath()+".gz已經壓縮完成！");
		}
	}

}

測試程式碼

package date0805.demo1;

import java.io.File;

public class Test {

	public static void main(String[] args) {
		File file=new File("D://新建資料夾");
		GZipFiles.GZip(file);
		GZipFiles.shutdown();
	}
}