java實現壓縮與解壓縮ZIP

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(); 
//會把目錄作爲一個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(); 
}catch (Exception e) { 
e.printStackTrace(); 
} 
} 
}