Java Utililty Methods Zip Folder

ZipOutputStream zip = null;
FileOutputStream fileWriter = null;
fileWriter = new FileOutputStream(destZipFile);
zip = new ZipOutputStream(fileWriter);
addFolderToZip("", srcFolder, zip);
zip.flush();
zip.close();

ZipOutputStream zip = null;
FileOutputStream fileWriter = null;
fileWriter = new FileOutputStream(destZipFile);
zip = new ZipOutputStream(fileWriter);
File f = new File(srcFolder);
File[] subFiles = f.listFiles();
for (int i = 0; i < subFiles.length; i++) {
    File subFile = subFiles[i];
...

ZipOutputStream zip = null;
FileOutputStream fileWriter = null;
try {
    fileWriter = new FileOutputStream(destZipFile);
    zip = new ZipOutputStream(fileWriter);
} catch (Exception ex) {
    ex.printStackTrace();
    return;
...

if (new File(srcFolder).isDirectory()) {
    ZipOutputStream zip = null;
    FileOutputStream fileWriter = null;
    try {
        fileWriter = new FileOutputStream(destZipFile);
        zip = new ZipOutputStream(fileWriter);
        addFolderToZip("", srcFolder, zip, addBaseFolder); 
    } finally {
...

ZipOutputStream zip = null;
FileOutputStream fileWriter = null;
fileWriter = new FileOutputStream(outputZipPath);
zip = new ZipOutputStream(fileWriter);
addFolderToZip("", srcFolderPath, zip);
zip.flush();
zip.close();

byte[] data = new byte[BUFFER_SIZE];
String prefix = root.getAbsolutePath();
for (File f : folder.listFiles()) {
    if (f.isDirectory()) {
        zipFolder(zipOut, f, root);
    } else {
        zipOut.putNextEntry(new ZipEntry(f.getAbsolutePath().substring(prefix.length())));
        FileInputStream in = new FileInputStream(f);
...

File f = new File(folderName);
if (f.exists()) {
    if (f.isDirectory()) {
        if (!folderName.equalsIgnoreCase(baseFolderName)) {
            String entryName = folderName.substring(baseFolderName.length(), folderName.length())
                    + File.separatorChar;
            ZipEntry ze = new ZipEntry(entryName);
            zos.putNextEntry(ze);
...