Java的压缩与解压缩ZIP
压缩是一种通过特定的算法来减小计算机文件大小的机制。这种机制是一种很方便的.发明,尤其是对网络用户,因为它可以减小文件的字节总数,使文件能够通过较慢的互联网连接实现更快传输,此外还可以减少文件的磁盘占用空间。下面小编准备了关于Java的压缩与解压缩ZIP,提供给大家参考!
压缩的
import eredInputStream;
import eredOutputStream;
import ;
import InputStream;
import OutputStream;
import ntry;
import utputStream;
public class Zip {
static final int BUFFER = 2048;
public static void main(String argv[]) {
try {
BufferedInputStream origin = null;
FileOutputStream dest = new FileOutputStream("E:test");
ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(
dest));
byte data[] = new byte[BUFFER];
File f = new File("e:testa");
File files[] = Files();
for (int i = 0; i < th; i++) {
FileInputStream fi = new FileInputStream(files[i]);
origin = new BufferedInputStream(fi, BUFFER);
ZipEntry entry = new ZipEntry(files[i]ame());
extEntry(entry);
int count;
while ((count = (data, 0, BUFFER)) != -1) {
e(data, 0, count);
}
e();
}
e();
} catch (Exception e) {
tStackTrace();
}
}
}
解压缩的
import eredInputStream;
import eredOutputStream;
import ;
import OutputStream;
import eration;
import ntry;
import ile;
public class UnZip {
static final int BUFFER = 2048;
public static void main(String argv[]) {
try {
String fileName = "E:test";
String filePath = "E:test";
ZipFile zipFile = new ZipFile(fileName);
Enumeration emu = ies();
int i=0;
while(oreElements()){
ZipEntry entry = (ZipEntry)Element();
//会把目录作为一个file读出一次,所以只建立目录就可以,之下的文件还会被迭代到。
if (rectory())
{
new File(filePath + ame())rs();
continue;
}
BufferedInputStream bis = new BufferedInputStream(nputStream(entry));
File file = new File(filePath + ame());
//加入这个的原因是zipfile读取文件是随机读取的,这就造成可能先读取一个文件
//而这个文件所在的目录还没有出现过,所以要建出目录来。
File parent = arentFile();
if(parent != null && (!ts())){
rs();
}
FileOutputStream fos = new FileOutputStream(file);
BufferedOutputStream bos = new BufferedOutputStream(fos,BUFFER);
int count;
byte data[] = new byte[BUFFER];
while ((count = (data, 0, BUFFER)) != -1)
{
e(data, 0, count);
}
h();
e();
e();
}
e();
} catch (Exception e) {
tStackTrace();
}
}
}