Java使用线程池递归压缩文件夹下面的所有子文件

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本文将介绍Java中利用线程池递归的方式压缩文件夹下面的所有子文件，具体方法如下：

Gzip单个文件压缩

对于单个文件使用GZip压缩。

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;}@Overridepublic 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+"文件已经存在，无法压缩!");}}}}

创建线程池进行递归压缩

要实现对一个文件夹下面的所有的子文件进行压缩，首先递归找出所有子文件，然后调用压缩线程进行压缩。

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();}}

压缩提示

package date0805.demo1;import java.io.File;public class CountTime implements Runnable {private File file;public CountTime(File file) {super();this.file = file;}@Overridepublic void run() {System.out.println("正在压缩"+file.getAbsolutePath());try {while(true) {System.out.print(".");Thread.sleep(1000);}}catch (InterruptedException e) {System.out.println();System.out.println(file.getAbsolutePath()+".gz已经压缩完成！");}}}

测试代码

package date0805.demo1;import java.io.File;public class Test {public static void main(String[] args) {File file=new File("D://新建文件夹");GZipFiles.GZip(file);GZipFiles.shutdown();}}

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