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 hereGZIPOutputStream gos = new GZIPOutputStream(new FileOutputStream("/home/zjz/Desktop/myFile"+ ".gz"));// Specify the input file hereFileInputStream fis = new FileInputStream("/home/zjz/Desktop/myNewFile.txt");// Read from input file and write to output GZip fileint 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-1while((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 writtenoff - the start offset of the datalen - the length of the data*/gos.write(buffer, 0, length);}fis.close();/* public void finish(): Finish writing compressed data tothe 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();}}}

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