飛翔的起點

統計

隨筆 - 72
文章 - 6
評論 - 23
引用 - 0

常用鏈接

留言簿(5)

隨筆分類

隨筆檔案

文章分類

文章檔案

搜索

閱讀排行榜

評論排行榜

java中壓縮與解壓縮的實現

壓縮的

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.util.zip.ZipEntry;

import java.util.zip.ZipOutputStream;

public class Zip {

static final int BUFFER = 2048;

public static void main(String argv[]) {

try {

BufferedInputStream origin = null;

FileOutputStream dest = new FileOutputStream("E:\\test\\myfiles.zip");

ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(

dest));

byte data[] = new byte[BUFFER];

File f = new File("e:\\test\\a\\");

File files[] = f.listFiles();

for (int i = 0; i < files.length; i++) {

FileInputStream fi = new FileInputStream(files[i]);

origin = new BufferedInputStream(fi, BUFFER);

ZipEntry entry = new ZipEntry(files[i].getName());

out.putNextEntry(entry);

int count;

while ((count = origin.read(data, 0, BUFFER)) != -1) {

out.write(data, 0, count);

}

origin.close();

}

out.close();

} catch (Exception e) {

e.printStackTrace();

}

2，解壓縮的。

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.util.Enumeration;

import java.util.zip.ZipEntry;

import java.util.zip.ZipFile;

public class UnZip {

static final int BUFFER = 2048;

public static void main(String argv[]) {

try {

String fileName = "E:\\test\\myfiles.zip";

String filePath = "E:\\test\\";

ZipFile zipFile = new ZipFile(fileName);

Enumeration emu = zipFile.entries();

int i=0;

while(emu.hasMoreElements()){

ZipEntry entry = (ZipEntry)emu.nextElement();

//會把目錄作為一個file讀出一次，所以只建立目錄就可以，之下的文件還會被迭代到。

if (entry.isDirectory())

{

new File(filePath + entry.getName()).mkdirs();

continue;

}

BufferedInputStream bis = new BufferedInputStream(zipFile.getInputStream(entry));

File file = new File(filePath + entry.getName());

//加入這個的原因是zipfile讀取文件是隨機讀取的，這就造成可能先讀取一個文件

//而這個文件所在的目錄還沒有出現過，所以要建出目錄來。

File parent = file.getParentFile();

if(parent != null && (!parent.exists())){

parent.mkdirs();

}

FileOutputStream fos = new FileOutputStream(file);

BufferedOutputStream bos = new BufferedOutputStream(fos,BUFFER);

int count;

byte data[] = new byte[BUFFER];

while ((count = bis.read(data, 0, BUFFER)) != -1)

{

bos.write(data, 0, count);

}

bos.flush();

bos.close();

bis.close();

}

zipFile.close();