zipper.java

java写的zip/unzip

//这是一个用于压缩ZIP文件的类//
import java.io.*;
import java.util.zip.*;//java.until提供一组常用的函数的类

class Zipper {
   public static boolean verbose = false;
   public static int compressionLevel = Deflater.DEFAULT_COMPRESSION;
   private String Name;
   private ZipOutputStream zip;
   private int entryNum;
   public Zipper(String fileName){
      Name=fileName;
      entryNum=0;
   }
   public String getName(){
      return Name;
   }
   public int getEntryNum(){
      return entryNum;
   }
   public void setName(String newName){
      Name=newName;
   }
   public int init(){
     //建立并初始化一个输出流
     try{
        zip = new ZipOutputStream(new FileOutputStream(Name));
        zip.setComment("zip file created by java");
        zip.setMethod(ZipOutputStream.DEFLATED);
        zip.setLevel(compressionLevel);
     }
     catch(Exception e){
     	System.out.println(e);
     	return 1;
     }
     return 0;
   }
   public int addFile(String fileName){
     try{
        File file = new File(fileName);
        FileInputStream in = new FileInputStream(file);
        byte[] bytes = new byte[in.available()];
        //in.available可以返回输入流中可以正常读取的字节数目，以免阻塞
      	in.read(bytes);
      	in.close();

      	//建立并初始化zipentry
      	ZipEntry entry = new ZipEntry(file.getName());
      	entry.setTime(file.lastModified());

      	// write the entry header, and the data, to the zip
      	zip.putNextEntry(entry);
      	zip.write(bytes);

      	// write the end-of-entry marker to the zip
      	zip.closeEntry();
     }
     catch(Exception e){
     	System.out.println(e);
     	return 1;
     }
     entryNum++;
     return 0;
   }
   public int close(){
     try{
        zip.close();
     }
     catch(Exception e){
     	System.out.println(e);
     	return 1;
     }
     return 0;
   }


   public static void main( String[] args ){
     boolean verbose = false;
     int compressionLevel = Deflater.DEFAULT_COMPRESSION;
     int argc = args.length;
     int argn;

     //	解析命令行参数
     for (argn=0; (argn<args.length) && args[argn].charAt(0)=='-'; ++argn){
       if ( args[argn].equals( "-v" ) )
            verbose = true;
       else if ( args[argn].equals( "-l" ) ) {
                 ++argn;
                compressionLevel = Integer.parseInt(args[argn]);
            }
            else{
                System.out.println( "usage: Zipper [-v] [-f] [-l level] zipfile files" );
                return;
            }
     }
     if ( argc - argn < 1 ){
       System.out.println( "usage: Zipper [-v] [-f] [-l level] zipfile files" );
       return;
     }
     else try{
        //余下的第一个参数是生成ZIP文件的名称
	Zipper zip=new Zipper(args[argn++]);
	zip.verbose=verbose;
	zip.compressionLevel=compressionLevel;
	zip.init();
    //其余的参数是需要压缩的文件的名称
        for ( ; argn < args.length; ++argn )
           //将一个文件读入内存
           zip.addFile(args[argn]);
        zip.close();

     }
     catch(Exception e){
        e.printStackTrace();
     }
   }
}