zipper.java

JAVA入门的一些基本写法以及一些入门的简单代码 由于本人只是初学者

//这是一个用于压缩ZIP文件的类//	
import java.io.*; 
import java.util.zip.*; 

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.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(); 
     } 
   }    
}