关于zip，tar压缩

  最近有个项目需要用压缩算法，懒得自己写算法了，直接就用了java自带的类库
zip的压缩如下

public void saveFileZip(String srcname,String destname)
	{ 
		try {
			BufferedInputStream origin = null;
			FileOutputStream dest = new FileOutputStream("E:\\test\\myfiles.zip");
			ZipOutputStream out = new ZipOutputStream(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());
			System.out.println(entry.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();
			}

	}

  由于zip是无损压缩，所以压缩的效率不是很高，需要高效的可以尝试下其他的压缩算法，如果是跟c连调的话建议还是自己写，因为同一种压缩格式在c跟java中有些地方是不一样的，不能通用。
  还有一种压缩方式tar的

public void saveFileTar() throws Exception
	{
		File desFile = new File("E:\\test","test.tar"); //.tar or .tar.gz
		File srcFile2 = new File("e:\\test\\a\\Mercury+LoadRunner教程8.1版.pdf");
    
		FileOutputStream fileoutPutStream = new FileOutputStream(desFile);
      /*
                     要壓.tar.gz在加一層GZIPOutputStream,TarArchive的constructor要改用GZIPOutputStream
     */
      // GZIPOutputStream gzOutput = new GZIPOutputStream(fileoutPutStream);

		TarEntry tarEntry = new TarEntry(srcFile2); 
		TarArchive desTarFile = new TarArchive(fileoutPutStream);        
		desTarFile.writeEntry(tarEntry,true);
		desTarFile.closeArchive();
	}