Java 将文件压缩为GZIP格式

From: http://beginnersbook.com/2014/07/how-to-compress-a-file-in-gzip-format/

/* 将文件压缩为GZIP格式，使用GZIPOutputStream的write()方法将array of bytes写入压缩文件中
 */

import java.io.*;
import java.util.zip.GZIPOutputStream;

public class Exercise {

  public static void main(String args[]) {
    Exercise zipObj = new Exercise();
    zipObj.gzipMyFile();
  }

  public void gzipMyFile() {
    byte[] buffer =  new byte[1024];
    try {
      // Specify Name and Path of Output GZip file here
      GZIPOutputStream gos = new GZIPOutputStream(new FileOutputStream("/home/zjz/Desktop/myFile"
          + ".gz"));
      // Specify the input file here
      FileInputStream fis = new FileInputStream("/home/zjz/Desktop/myNewFile.txt");
      // Read from input file and write to output GZip file
      int length;
      // fis.read(buffer)， 结果时Buffer有了内容，同时返回读取内容的长度，读到文件末尾时读取内容的长度变为-1
      while((length = fis.read(buffer)) > 0) {
        /* public void write(byte[] buf, int off, int len):
        Write array of bytes to the compressed output stream.
        This method will block until all the bytes are written.
        Parameter:
        buf - the data to written
        off - the start offset of the data
        len - the length of the data
         */
        gos.write(buffer, 0, length);
      }
      fis.close();
      /* public void finish(): Finish writing compressed data to
      the output stream without closing the underlying stream
       */
      gos.finish();
      gos.close();
      System.out.println("File Compressed!!");

    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

}