To alter content of the file

Question

Hi
I can not get file.txt that this contained in the jar to alter. it is a file of properties in format text, I get to read the information inside of the file using the package java.util.zip.*! but I don't get to alter that file and to save inside of the jar! It is in time of execution.
this get file:
public void readProps()throws FileNotFoundException, IOException{
java.util.zip.ZipFile zipFile = new java.util.zip.ZipFile("celesc.jar");
java.io.InputStream inputStream = zipFile.getInputStream(new java.util.zip.ZipEntry("files/SerCom.props"));
properties.load(inputStream);
inputStream.close();
zipFile.close();
this should save the file inside of the jar, but it doesn't work.
public void saveProps() throws Exception{
FileOutputStream dest = new FileOutputStream("celesc.jar");
ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(dest));
ZipEntry entry = new ZipEntry("files/SerCom.props");
out.putNextEntry(entry);
//out.write(data, 0, count);
This code is part of an executable jar, celesc.jar

Answer 1

but I don't get to alter that file and to save inside of the jar!No, you don't. You have to create a new jar file, then copy everything from the old jar file to the new file, writing the new version of your special file instead of the old version. However you may want to rethink the idea of keeping that file inside the jar, as recreating the entire jar file is an expensive operation.
PC²