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;
}
@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+"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;
}
@Override
public 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();
}
}