大数据之文件的压缩和解压缩

一，压缩

类似于war提供的功能；实现由ZipOutputStream类和ZipInputStream提供

public static void addFile(ZipOutputStream zos,String path) throws Exception
    {
        File f = new File(path);
        zos.putNextEntry(new ZipEntry(f.getName()));
        FileInputStream fis = new FileInputStream(f);
        byte[] bytes = new byte[fis.available()];
        fis.read(bytes);
        fis.close();
        
        zos.write(bytes);
        zos.closeEntry();
    }

二，解压缩

public void unzip() throws Exception
    {
        FileInputStream fis = new FileInputStream("d:/arch/xxx.zip");
        ZipInputStream zis = new ZipInputStream(fis);
        
        ZipEntry entry = null;
        byte[] buf = new byte[1024];
        int len = 0;
        while((entry = zis.getNextEntry())!=null){
            String name = entry.getName();
            FileOutputStream fos = new FileOutputStream("d:/arch/unzip/"+name);
            while((len = zis.read(buf))!= -1)
            {
                fos.write(buf,0,len);
            }
            fos.close();
        }
        zis.close();
        fis.close();
        
    }

类的调用;

public static void main(String[] args) throws Exception {
         FileOutputStream fos = new FileOutputStream("d:/arch/xxx.xar");
         ZipOutputStream zos = new ZipOutputStream(fos);
         
         String[] arr = {
                 "d:/arch/a.xls",
                 "d:/arch/c.txt"
         };
         
        for(String s:arr){
            addFile(zos,s);
        }
        zos.close();
        fos.close();
        System.out.println("over");
    }