Replacing a Zip file without unzipping in Java
<p>I have a zip file and I want to replace one file inside it with another file. So do not need to delete a zip entry just replace the file for the zip entry with another.</p>

<p>Here is what I have tried. </p>

<pre><code>public void replaceConfigurationFile(ZipFile zipFile, ZipOutputStream zos, String pathToNewFile, String configFileToReplaced) 
        throws IOException {
    String zipEntryName;
    for(Enumeration&lt;?&gt; e = zipFile.entries(); e.hasMoreElements(); ) {

        ZipEntry entryIn = (ZipEntry) e.nextElement();
        zipEntryName = entryIn.getName();
            if(zipEntryName.endsWith(configFileToReplaced)) {

                FileInputStream fis = new FileInputStream(pathToNewFile);
                ZipEntry zipEntry = new ZipEntry(zipEntryName);

                zos.putNextEntry(zipEntry);

                byte[] bytes = new byte[1024];
                int length;
                while ((length = fis.read(bytes)) &gt;= 0) {
                    zos.write(bytes, 0, length);
                }

                zos.closeEntry();
                fis.close();
            } else {
                zos.putNextEntry(entryIn);
                InputStream is = zipFile.getInputStream(entryIn);
                byte [] buf = new byte[1024];
                int len;
                while((len = (is.read(buf))) &gt; 0) {            
                    zos.write(buf, 0, len);
                }
             zos.closeEntry();  
           }


    } // enf of for
}   
</code></pre>

<p>I have a file zip Entry named :</p>

<pre><code>WEB-INF/classes/config/app-dev.yml
</code></pre>

<p>and I have a file at location d drive at location</p>

<pre><code> D:/app-dev.yml
</code></pre>

<p>I am able to copy the file in to a different zip file by replacing the file i want to replace . But that is really not needed (to create a different file).
So what should I do to just replace the file with my custom file.</p>

<p>I have searched different posts in Stackoverflow, but unable to find what i need. I read that zip entry cannot be deleted but what about replacing it ? Please help</p>