Zip Directory Recursively

[victor kamat]

I need to programmatically zip up a directory recursively.

Can you please guide me to what I should be looking.

[Rob Spoor]

Obviously, File.listFiles() is your best friend in this example. Without it, recursion is going to be hard.

That said, the biggest issue is building the folder structure inside your ZIP file. You can't use only getName() when creating ZipEntry objects, since then you loose the path information. Using the absolute path is also not a good idea, since it will add too much path information. toString() looks like a good idea but has the same problem as the absolute path if the file is absolute.

I've solved this in the past by specifying the parent path myself:

// if you don't need to specify a name
void zip(File file, ZipOutputStream zos) throws IOException
{
    zip(file, file.getName(), zos);
}

// name is the name for the file
void zip(File file, String name, ZipOutputStream zos) throws IOException
{
    if (file.isDirectory())
    {
        File[] files = file.listFiles();
        if (files != null) // always check, in case the folder can't be read
        {
            for (File f: files)
            {
                String childName = name + "/" + f.getName();
                zip(f, childName, zos);
            }
        }
    }
    else
    {
        // zip the file using the given name
    }
}

[Michael Schnell]

Hi there!

You could use Utils4J: Utils4J / Zip a directory

Regards
Michael

[André Asantos]

Please what can I pass as argument to ZipOutputStream ???

-> void zip(File file, ZipOutputStream zos) throws IOException  

[André Asantos]

I know I must pass the directory where the compressed will appear... but how?

[Paul Clapham]

Just create a ZipOutputStream and wrap it around an OutputStream which sends the data where you want it to go.

Since apparently you want it to go to a file, then a FileOutputStream would be a good choice. So:

new ZipOutputStream(new FileOutputStream("name of the file goes here"))

[André Asantos]

ohhhh paul... I tried but my method failed... sorry

[André Asantos]

I have created into C: a folder named teste50 that has into it a child folder named 1 the has two .doc files, so, the method can find but compress only the folder no compress her children the files... Look at below please:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipOutputStream;

public class Teste {
	public static void main(String argv[]) {
		String outFilename = "c:\\teste50\\1.zip";
		ZipOutputStream out = null;
		try {
			out = new ZipOutputStream(new FileOutputStream(outFilename));
		} catch (FileNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		
		try {
	zip(new File("c:\\teste50\\1"),out );
		} catch (IOException e) {
			e.printStackTrace();
		}		
	}

	 // if you don't need to specify a name  
	static void zip(File file, ZipOutputStream zos) throws IOException  
	{  
	    zip(file, file.getName(), zos);  
	}  
	  
	// name is the name for the file  
	static void zip(File file, String name, ZipOutputStream zos) throws IOException  
	{  
	    if (file.isDirectory())  
	    {  
	        File[] files = file.listFiles();  
	        if (files != null) // always check, in case the folder can't be read  
	        {  
	            for (File f: files)  
	            {  
	                String childName = name + "/" + f.getName();  
	                zip(f, childName, zos);  
	            }  
	        }  
	    }  
	    else  
	    {  
	        // zip the file using the given name  
	    }  
	}  

}

[André Asantos]

I think the method is not complete...

[Ulf Dittmer]

André Asantos wrote:the method can find but compress only the folder no compress her children the files...

Of course the files are missing - the else block that is supposed to handle files is empty.

[André Asantos]

Could you help me please?

I am trying but facing difficult, look at:

Throws IOException:

else  
	    {  
	        // Add ZIP entry to output stream.
	        to.putNextEntry(new ZipEntry(to.toString()));

	        // Transfer bytes from the file to the ZIP file
	        int len;
	        FileInputStream in = new FileInputStream(from);
	        
	        while ((len = in.read()) > 0) {
	            to.write(len);
	        }

	        // Complete the entry
	        to.closeEntry();
	        in.close();
	    }

[Ulf Dittmer]

If you really want people to help you, you need to get in the habit to TellTheDetails. What do you think an exception name is worth without either the exception message or the line of code in which it happens?

[André Asantos]

I got it...

So, I would like to get a complete method that works that, a method that compressess folders/directories beucase I was just trying... only an attempt...

[André Asantos]

Could you help me with this method it crashed when reading a folder:

 //método para compactar arquivo e ou diretorio
      public static void compactarParaZip(String arqSaida,String[] arqEntrada) throws IOException{
          int cont;
          byte[] dados = new byte[TAMANHO_BUFFER];
                      
          BufferedInputStream origem = null;
          FileInputStream streamDeEntrada = null;
          FileOutputStream destino = null;
          ZipOutputStream saida = null;
          ZipEntry entry = null;
                 
          try {
               destino = new FileOutputStream(new File(arqSaida));
               saida = new ZipOutputStream(new BufferedOutputStream(destino));
             
               for (int i = 0; i < arqEntrada.length; i++) {
				
            	   File file = new File(arqEntrada[i]);
                   
                   if(file.isDirectory()){
                       for (File arquivos : file.listFiles()) {
                           streamDeEntrada = new FileInputStream(arquivos); //crashed here!!!
                           origem = new BufferedInputStream(streamDeEntrada, TAMANHO_BUFFER);
                           entry = new ZipEntry(arquivos.getName());
                           saida.putNextEntry(entry);
                           while((cont = origem.read(dados, 0, TAMANHO_BUFFER)) != -1) {
                               saida.write(dados, 0, cont);
                           }
                       }
                   }else{
                       streamDeEntrada = new FileInputStream(file);
                       origem = new BufferedInputStream(streamDeEntrada, TAMANHO_BUFFER);
                       entry = new ZipEntry(file.getName());
                       saida.putNextEntry(entry);
                       while((cont = origem.read(dados, 0, TAMANHO_BUFFER)) != -1) {
                           saida.write(dados, 0, cont);
                       }
                   }
                   
			}
              
                          
               origem.close();
               saida.close();
           } catch(IOException e) {
               throw new IOException(e.getMessage());
           }
      }

[André Asantos]

sorry that works but not 100% right... let me explain better:

exemple:
if you try to compress a folder named exemple folder1 that has a child named file1 together another file named file2 that compresses but when you descompress the result is -> file1 and file2 instead of folder1/file1 and file2.