文件名称：java算法，实现压缩及解压缩
文件大小：3KB
文件格式：TXT
更新时间：2015-05-09 16:06:40
java算法，实现压缩及解压缩
Java实现压缩与解压缩ZIP 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(); } } } 解压缩的 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(); //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(); } } }