The following tutorial, we show how to create zip archive from byte array.
1. Add dependency.
2. Implement The following example code.<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-compress --><dependency><groupId>org.apache.commons</groupId><artifactId>commons-compress</artifactId><version>1.15</version></dependency>
2.1 Write to file.
package com.haruka.compressfilebytearraydemo;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
public class App
{
public static void main( String[] args )
{
ZipArchiveOutputStream zOutputStream = null;
FileOutputStream fileOutputStream = null;
try {
List<byte[]> byteArrayListToWrite = new ArrayList<byte[]>();
byteArrayListToWrite.add("THIS IS DATA TO TEST WHRITE ZIP WITH BYTE ARRAY 1".getBytes());
byteArrayListToWrite.add("THIS IS DATA TO TEST WHRITE ZIP WITH BYTE ARRAY 2".getBytes());
byteArrayListToWrite.add("THIS IS DATA TO TEST WHRITE ZIP WITH BYTE ARRAY 3".getBytes());
fileOutputStream = new FileOutputStream("C:\\DEMO\\bytearrayarchivedemo.zip"); //path to save archive file.
zOutputStream = new ZipArchiveOutputStream(fileOutputStream);
for(int i=0;i<byteArrayListToWrite.size();i++) {
byte[] dataToWrite = byteArrayListToWrite.get(i);
ZipArchiveEntry zEntry = new ZipArchiveEntry("file_"+i+".txt"); // create zip entry and specific file name.
zEntry.setSize(dataToWrite.length); //set size of data.
zOutputStream.putArchiveEntry(zEntry); //add entry.
zOutputStream.write(dataToWrite);
zOutputStream.closeArchiveEntry(); // commit added entry (commit file).
}
}catch(Exception ex) {
ex.printStackTrace();
}finally {
try {
if(zOutputStream != null) {
zOutputStream.flush(); //save file.
zOutputStream.close();
}
if(fileOutputStream != null) {
fileOutputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
2.2 Write to servlet response.package com.haruka.compressfilebytearraydemoservlet.servlet;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
public class CompressFileByteArrayDemo extends HttpServlet{
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ZipArchiveOutputStream zOutputStream = null;
try {
List<byte[]> byteArrayListToWrite = new ArrayList<byte[]>();
byteArrayListToWrite.add("THIS IS DATA TO TEST WHRITE ZIP WITH BYTE ARRAY 1".getBytes());
byteArrayListToWrite.add("THIS IS DATA TO TEST WHRITE ZIP WITH BYTE ARRAY 2".getBytes());
byteArrayListToWrite.add("THIS IS DATA TO TEST WHRITE ZIP WITH BYTE ARRAY 3".getBytes());
response.setContentType("application/zip"); //set content type
zOutputStream = new ZipArchiveOutputStream(response.getOutputStream());
for(int i=0;i<byteArrayListToWrite.size();i++) {
byte[] dataToWrite = byteArrayListToWrite.get(i);
ZipArchiveEntry zEntry = new ZipArchiveEntry("file_"+i+".txt"); // create zip entry and specific file name.
zEntry.setSize(dataToWrite.length); //set size of data.
zOutputStream.putArchiveEntry(zEntry); //add entry.
zOutputStream.write(dataToWrite);
zOutputStream.closeArchiveEntry(); // commit added entry (commit file).
}
}catch(Exception ex) {
ex.printStackTrace();
}finally {
try {
if(zOutputStream != null) {
zOutputStream.flush(); //save file.
zOutputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
Furthermore, the example can be adapt with other outputStream for any purpose.The example can be downloaded in following github:
1. For write to file example.
https://github.com/benzyaa/javademo/tree/master/compressfilebytearraydemo
2. For write to servlet response.
https://github.com/benzyaa/javademo/tree/master/compressfilebytearraydemoservlet
Further Information:
https://commons.apache.org/proper/commons-compress/index.html
https://mvnrepository.com/artifact/org.apache.commons/commons-compress
