Gzip單個文件壓縮

對于單個文件使用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+"文件已經存在，無法壓縮!");
            }
        }
    }
}

創建線程池進行遞歸壓縮

要實現對一個文件夾下面的所有的子文件進行壓縮，首先遞歸找出所有子文件，然后調用壓縮線程進行壓縮。

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！");
        }
    }

}

測試代碼

package date0805.demo1;

import java.io.File;

public class Test {

    public static void main(String[] args) {
        File file=new File("D:\\新建文件夾");
        GZipFiles.GZip(file);
        GZipFiles.shutdown();
    }
}

來自：http://my.oschina.net/zzw922cn/blog/488382