Compress .zip using Java

[André Asantos]

Hey guys, how are you?
I am just looking for a method that could compress more than one file passed as argument in only one .zip, for exemple I have two files and one folder after compressing will be only one file named compressedallfile.zip. Got it?

[James Sabre]

java.util.zip.ZipOutputStream

[André Asantos]

Hi James, thanks for helping me... I already know that Java's class however I can't use it to multi-files I only know to use it for only one file, look at below my code please:

 private void compactarParaZip(String arqEntrada1, String arqEntrada2, String arqSaida) throws IOException{
	      
		   int tamanhoBuffer = 99999;
		   int cont = 0;
	       byte[] dados = new byte[tamanhoBuffer];
	                   
	       BufferedInputStream origem1 = null;
	       BufferedInputStream origem2 = null;
	       
	       FileInputStream streamDeEntrada1 = null;
	       FileInputStream streamDeEntrada2 = null;
	       
	       FileOutputStream destino = null;
	       
	       ZipOutputStream saida = null;
	    	     	       
	       ZipEntry entry1 = null;
	       ZipEntry entry2 = null;
	              
	       try {
	            destino = new FileOutputStream(new File(arqSaida));
	            
	            saida = new ZipOutputStream(new BufferedOutputStream(destino));
	            	            	            
	            File file1 = new File(arqEntrada1);
	            File file2 = new File(arqEntrada2);
	            
	            streamDeEntrada1 = new FileInputStream(file1);
	            streamDeEntrada2 = new FileInputStream(file2);
	            
	            origem1 = new BufferedInputStream(streamDeEntrada1, tamanhoBuffer);
	            origem2 = new BufferedInputStream(streamDeEntrada2, tamanhoBuffer);
	            
	            entry1 = new ZipEntry(file1.getName());
	            entry2 = new ZipEntry(file2.getName());
	            
	            saida.putNextEntry(entry1);
	            saida.putNextEntry(entry2);
	                       
	     
	            
	            while((cont = origem2.read(dados, 0, tamanhoBuffer)) != -1) {
	                saida.write(dados, 0, cont);
	            }
	            
	            while((cont = origem1.read(dados, 0, tamanhoBuffer)) != -1) {
	                saida.write(dados, 0, cont);
	            }
	            
	            origem1.close();
	            origem2.close();
	            
	            saida.close();
	            
	        } catch(IOException e) {
	            throw new IOException(e.getMessage());
	        }
	   } 

A detail the last one file override the first one... got it?

[Ulf Dittmer]

http://www.exampledepot.com/egs/java.util.zip/CreateZip.html

[Rob Spoor]

First put one entry, then copy its data, then put the second entry.

[Campbell Ritchie]

Moving discussion as too difficult for "beginning Java™"

[André Asantos]

First of all, thanks all for helping me...

Ulf Dittmer wrote:http://www.exampledepot.com/egs/java.util.zip/CreateZip.html

Hey Ulf, thanks a lot for sending this link, that really works, but for my case I need also delete folders... And during deleting I face that exception:

C:\DOCUME~1\ALASAN~1\CONFIG~1\Temp\\mimetype (Access Denied)
java.io.FileNotFoundException: C:\DOCUME~1\ALASAN~1\CONFIG~1\Temp\OEBPS (Acesso negado)

Look the method I have now:

 private void compactarParaZip(String[] arquivosEOuPastas, String arquivoDeSaida){ 
			// These are the files to include in the ZIP file
		

			 // Create a buffer for reading the files
			 byte[] buf = new byte[1024];

			 try {
			     // Create the ZIP file
			   
			     ZipOutputStream out = new ZipOutputStream(new FileOutputStream(arquivoDeSaida));

			     // Compress the files
			     for (int i=0; i<arquivosEOuPastas.length; i++) {
			         FileInputStream in = new FileInputStream(arquivosEOuPastas[i]);

			         // Add ZIP entry to output stream.
			         out.putNextEntry(new ZipEntry(arquivosEOuPastas[i]));
			         	System.out.println(arquivosEOuPastas[i]);
			         // Transfer bytes from the file to the ZIP file
			         int len;
			         while ((len = in.read(buf)) > 0) {
			             out.write(buf, 0, len);
			         }

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

			     // Complete the ZIP file
			     out.close();
			 } catch (IOException e) {
				 e.printStackTrace();
			 }
		 }

[André Asantos]

That works perfectly to files when try using with folders don't find the folder's directory and says I don't have permissions to have access through.

[André Asantos]

I am passing as argument the following:

File[] enderecoDosArquivosEOuPastas = {
				new File(System.getProperty("java.io.tmpdir") + File.separator + "mimetype"),
				new File(System.getProperty("java.io.tmpdir") + File.separator + "OEBPS"),
				new File(System.getProperty("java.io.tmpdir") + File.separator + "META-INF")
		};
		
		epubHandler.compactarParaZip(enderecoDosArquivosEOuPastas, "C:/Documents and Settings/alasantos/Configurações locais/Temp/teste/testes.zip");
		

[James Sabre]

André Asantos wrote:I am passing as argument the following:

File[] enderecoDosArquivosEOuPastas = {
				new File(System.getProperty("java.io.tmpdir") + File.separator + "mimetype"),
				new File(System.getProperty("java.io.tmpdir") + File.separator + "OEBPS"),
				new File(System.getProperty("java.io.tmpdir") + File.separator + "META-INF")
		};
		
		epubHandler.compactarParaZip(enderecoDosArquivosEOuPastas, "C:/Documents and Settings/alasantos/Configurações locais/Temp/teste/testes.zip");
		

I don't know about "mimetype" and "OEBPS" but "META-INF" is normally a directory. You need to pass a list of all the files you want to include in the zip file; not just a list of directories.

Using recursion it is almost trivial to traverse a directory and add to the zip file the files one finds. Just make sure you don't try to zip the zip file into itself!

[André Asantos]

hmmm excelent tip...

I have got to do following below now:

That works:

File[] enderecoDosArquivosEOuPastas = {
				new File(System.getProperty("java.io.tmpdir") + File.separator + "mimetype"),
				new File(System.getProperty("java.io.tmpdir") + File.separator + "OEBPS"),
				new File(System.getProperty("java.io.tmpdir") + File.separator + "META-INF")
		};
		
		epubHandler.compactarParaZip(enderecoDosArquivosEOuPastas, "C:/Documents and Settings/alasantos/Configurações locais/Temp/teste/testes.zip");

 private void compress(File[] arquivosEOuPastas, String arquivoDeSaida){ 
		 try 
		 { 
		     //create a ZipOutputStream to zip the data to 
		     ZipOutputStream zos = new 
		     
		     ZipOutputStream(new FileOutputStream(arquivoDeSaida)); 
		    
		     //assuming that there is a directory named inFolder (If there 
		     //isn't create one) in the same directory as the one the code runs from, 
		     //call the zipDir method 
		    for (int i = 0; i < arquivosEOuPastas.length; i++) {
		    	 zipDir(new File("C://DOCUME~1//ALASAN~1//CONFIG~1//Temp//OEBPS").toString(), zos); 
			}
		   
		    //close the stream 
		    zos.close(); 
		 } 
		 catch(Exception e) 
		 { e.printStackTrace();}
		     //handle exception 
		 }

//here is the code for the method 
		 public void zipDir(String dir2zip, ZipOutputStream zos) 
		 { 
		     try 
		    { 
		         //create a new File object based on the directory we have to zip File    
		         File zipDir = new File(dir2zip); 
		         
		         //get a listing of the directory content 
		         String[] dirList = zipDir.list(); 
		         byte[] readBuffer = new byte[2156]; 
		         int bytesIn = 0; 
		         
		         //loop through dirList, and zip the files 
		         for(int i=0; i<dirList.length; i++) 
		         { 
		             File f = new File(zipDir, dirList[i]); 
		             if(f.isDirectory()) 
		         { 
		             //if the File object is a directory, call this 
		             //function again to add its content recursively 
		             String filePath = f.getPath(); 
		             zipDir(filePath, zos); 
		           
		             //loop again 
		             continue; 
		         } 
		             //if we reached here, the File object f was not a directory 
		             //create a FileInputStream on top of f 
		             FileInputStream fis = new FileInputStream(f); 
		             
		             //create a new zip entry 
		             ZipEntry anEntry = new ZipEntry(f.getPath()); 
		             
		             //place the zip entry in the ZipOutputStream object 
		             zos.putNextEntry(anEntry); 
		             
		             //now write the content of the file to the ZipOutputStream 
		             while((bytesIn = fis.read(readBuffer)) != -1) 
		             { 
		                 zos.write(readBuffer, 0, bytesIn); 
		             } 
		            //close the Stream 
		            fis.close(); 
		     } 
		 } 
		 catch(Exception e) 
		 { 
		     e.printStackTrace();
			 //handle exception 
		 } 
	 }

The only problem is generate exception saying:

java.util.zip.ZipException: duplicate entry: C:\DOCUME~1\ALASAN~1\CONFIG~1\Temp\OEBPS\fonts\DejaVuSerif-Bold.ttf
	at java.util.zip.ZipOutputStream.putNextEntry(Unknown Source)
	at EpubHandler.zipDir(EpubHandler.java:423)
	at EpubHandler.zipDir(EpubHandler.java:410)
	at EpubHandler.compactarParaZip(EpubHandler.java:377)
	at EpubHandler.main(EpubHandler.java:73)
java.util.zip.ZipException: duplicate entry: C:\DOCUME~1\ALASAN~1\CONFIG~1\Temp\OEBPS\page-template.xpgt
	at java.util.zip.ZipOutputStream.putNextEntry(Unknown Source)
	at EpubHandler.zipDir(EpubHandler.java:423)
	at EpubHandler.compactarParaZip(EpubHandler.java:377)
	at EpubHandler.main(EpubHandler.java:73)
java.util.zip.ZipException: duplicate entry: C:\DOCUME~1\ALASAN~1\CONFIG~1\Temp\OEBPS\fonts\DejaVuSerif-Bold.ttf
	at java.util.zip.ZipOutputStream.putNextEntry(Unknown Source)
	at EpubHandler.zipDir(EpubHandler.java:423)
	at EpubHandler.zipDir(EpubHandler.java:410)
	at EpubHandler.compactarParaZip(EpubHandler.java:377)
	at EpubHandler.main(EpubHandler.java:73)
java.util.zip.ZipException: duplicate entry: C:\DOCUME~1\ALASAN~1\CONFIG~1\Temp\OEBPS\page-template.xpgt
	at java.util.zip.ZipOutputStream.putNextEntry(Unknown Source)
	at EpubHandler.zipDir(EpubHandler.java:423)
	at EpubHandler.compactarParaZip(EpubHandler.java:377)
	at EpubHandler.main(EpubHandler.java:73)

I am worried about the exception... Could it be not important to worry?

[James Sabre]

Never having seen that exception I'm on uncertain ground here. Though I don't like your use of 'continue' there is nothing that stands out to me as being wrong. Points :-

1) You would do better to use File#listFiles() rather than File#list() since this would return you an array of files. It is usually better to work with File objects than String objects when dealing with files. Note that the return list can be 'null' so make sure you handle that.
2) Having never used it in this scenario I'm not sure what happens creating the entry name of f.getPath(). I always use f.getCanonicalPath() and strip off the first N characters when N is the length of the root.getCanonicalPath(). Example -

             final String name = file.getCanonicalPath().substring(rootLength);

3) I seem to remember that the path separator in zip files is always '/' but I can't be sure.

[André Asantos]

Hey good morning sir.... Could you please send me an exemple?

[André Asantos]

File[] enderecoDosArquivosEOuPastas = {
				new File(System.getProperty("java.io.tmpdir") + File.separator + "mimetype"), // a file
				new File(System.getProperty("java.io.tmpdir") + File.separator + "OEBPS"), // a folder
				new File(System.getProperty("java.io.tmpdir") + File.separator + "META-INF") // a folder
};

I am getting access through:

 private void compactaParaZip(File[] arquivosEOuPastas, String arquivoDeSaida){ 
	 try 
	 { 
	     //create a ZipOutputStream to zip the data to 
	     ZipOutputStream zos = new 
	     
	     ZipOutputStream(new FileOutputStream(arquivoDeSaida)); 
	    
	     //assuming that there is a directory named inFolder (If there 
	     //isn't create one) in the same directory as the one the code runs from, 
	     //call the zipDir method 
	    for (int i = 0; i < arquivosEOuPastas.length; i++) {
	    	 zipDir(new File(""+arquivosEOuPastas[i]+"").toString(), zos);  
...
...
...
		}

[André Asantos]

The problem is on my code structure to compress.

[André Asantos]

The following method throws NullPointer:

	 private void compactaParaZip(File[] arquivosEOuPastas, String arquivoDeSaida){ 
		    ZipOutputStream zos = null;
			try {
				zos = new  ZipOutputStream(new FileOutputStream(arquivoDeSaida)); // Create a ZipOutputStream to zip the data to 
			} catch (FileNotFoundException e) {	
				e.printStackTrace();
			} 
			
		    for (int i = 0; i < arquivosEOuPastas.length; i++) {
			   	 zipDir(new File(""+arquivosEOuPastas[i]+"").toString(), zos); 
			}
		    
		    try {
				zos.close(); // Close the stream 
			} catch (IOException e) {
				e.printStackTrace();
			} 
	 }

	 public void zipDir(String dir2zip, ZipOutputStream zos){ 
	     try { 
	         File zipDir = new File(dir2zip); 
	           
	         String[] dirList = zipDir.list();  // Get a listing of the directory content 

	         byte[] readBuffer = new byte[2156]; 
	         
	         int bytesIn = 0; 
	         
	         for(int i = 0; i < dirList.length; i++){ // Loop through dirList, and zip the files  
	        	 File f = new File(zipDir, dirList[i]); // NullPointer
	            
	        	 if(f.isDirectory()){  // If the File object is a directory, call this function again to add its content recursively 
		             String filePath = f.getPath(); 
		             zipDir(filePath, zos); 
		           
	             //loop again 
	             continue; 
	         } 
	             //if we reached here, the File object f was not a directory 
	             //create a FileInputStream on top of f 
	             FileInputStream fis = new FileInputStream(f); 
	             
	             //create a new zip entry 
	             ZipEntry anEntry = new ZipEntry(f.getPath()); 
	             
	             //place the zip entry in the ZipOutputStream object 
	             zos.putNextEntry(anEntry); 
	             
	             //now write the content of the file to the ZipOutputStream 
	             while((bytesIn = fis.read(readBuffer)) != -1) 
	             { 
	                 zos.write(readBuffer, 0, bytesIn); 
	             } 
	            //close the Stream 
	            fis.close(); 
	     } 
	 } 
	 catch(Exception e) 
	 { 
	     e.printStackTrace();
		 //handle exception 
	 } 
}

[Ulf Dittmer]

Were you planning on telling us in which line the NPE happens, and which object is null (which I assume you have investigated before posting here)?

[André Asantos]

Ulf Dittmer, you are right, let me base on below source before posting more.

I will be right back... Bye


http://download.oracle.com/javase/6/docs/api/
and
http://java.sun.com/developer/technicalArticles/Programming/compression/

[André Asantos]

Sir, I tried all day to fix this problem but I can't... My doubt is howto transform/do this following method that works compress a directory/folder
as well because currently only compress files... I know that I need recursivity but I don't get to do sorry... Look at below please:

public static void main(String argv[]) {
		try {
			compactarParaZip("c:\\teste50\\1.exe", "c:\\teste50\\1.zip");
		} catch (IOException e) {
			e.printStackTrace();
		}		
	}

public static void compactarParaZip(String arqEntrada,String arqSaida) throws IOException {
		int TAMANHO_BUFFER = 10000000;
		int cont = 0;
		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));
			File file = new File(arqEntrada);
			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());
		}
	}