java: how to compress data into a String and uncompress data from the String
- by Guillaume
I want to put some compressed data into a remote repository.
To put data on this repository I can only use a method that take the name of the resource and its content as a String. (like data.txt + "hello world").
The repository is moking a filesystem but is not, so I can not use File directly.
I want to be able to do the following:
client send to server a file 'data.txt'
server compress 'data.txt' into
data.zip server send to repository
content of data.zip repository store
data.zip client download from repository data.zip and his able to open it with its favorite zip tool
I have tried a lots of compressing example found on the web but each time a send the data to the repository, my resulting zip file is corrupted.
Here is a sample class, using the zip*stream and that emulate the repository showcasing my problem.
The created zip file is working, but after its 'serialization' it's get corrupted.
(the sample class use jakarta commons.io )
Many thanks for your help.
package zip;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
import org.apache.commons.io.FileUtils;
/**
* Date: May 19, 2010 - 6:13:07 PM
*
* @author Guillaume AME.
*/
public class ZipMe {
public static void addOrUpdate(File zipFile, File ... files) throws IOException {
File tempFile = File.createTempFile(zipFile.getName(), null);
// delete it, otherwise you cannot rename your existing zip to it.
tempFile.delete();
boolean renameOk = zipFile.renameTo(tempFile);
if (!renameOk) {
throw new RuntimeException("could not rename the file " + zipFile.getAbsolutePath() + " to " + tempFile.getAbsolutePath());
}
byte[] buf = new byte[1024];
ZipInputStream zin = new ZipInputStream(new FileInputStream(tempFile));
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile));
ZipEntry entry = zin.getNextEntry();
while (entry != null) {
String name = entry.getName();
boolean notInFiles = true;
for (File f : files) {
if (f.getName().equals(name)) {
notInFiles = false;
break;
}
}
if (notInFiles) {
// Add ZIP entry to output stream.
out.putNextEntry(new ZipEntry(name));
// Transfer bytes from the ZIP file to the output file
int len;
while ((len = zin.read(buf)) > 0) {
out.write(buf, 0, len);
}
}
entry = zin.getNextEntry();
}
// Close the streams
zin.close();
// Compress the files
if (files != null) {
for (File file : files) {
InputStream in = new FileInputStream(file);
// Add ZIP entry to output stream.
out.putNextEntry(new ZipEntry(file.getName()));
// 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
}
tempFile.delete();
out.close();
}
public static void main(String[] args) throws IOException {
final String zipArchivePath = "c:/temp/archive.zip";
final String tempFilePath = "c:/temp/data.txt";
final String resultZipFile = "c:/temp/resultingArchive.zip";
File zipArchive = new File(zipArchivePath);
FileUtils.touch(zipArchive);
File tempFile = new File(tempFilePath);
FileUtils.writeStringToFile(tempFile, "hello world");
addOrUpdate(zipArchive, tempFile);
//archive.zip exists and contains a compressed data.txt that can be read using winrar
//now simulate writing of the zip into a in memory cache
String archiveText = FileUtils.readFileToString(zipArchive);
FileUtils.writeStringToFile(new File(resultZipFile), archiveText);
//resultingArchive.zip exists, contains a compressed data.txt, but it can not
//be read using winrar: CRC failed in data.txt. The file is corrupt
}
}
