java实现zip与unzip
http://weareold.iteye.com/blog/459303
jdk提供了Zip相关的类方便的实现压缩和解压缩。使用方法很简单。下边分别是压缩和解压缩的简单事例
1，压缩的
jdk提供了Zip相关的类方便的实现压缩和解压缩。使用方法很简单。下边分别是压缩和解压缩的简单事例
1，压缩的
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 |
Java代码 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，解压缩的。
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 |
Java代码 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(); // 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 (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 = 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(); } } } |
