Java Utililty Methods Zip Files

System.out.println("Writing '" + fileName + "' to zip file");
File file = new File(fileName);
FileInputStream fis = new FileInputStream(file);
ZipEntry zipEntry = new ZipEntry(file.getName());
zos.putNextEntry(zipEntry);
byte[] bytes = new byte[1024];
int length;
while ((length = fis.read(bytes)) >= 0) {
...

zipFile.createNewFile();
FileOutputStream fout = new FileOutputStream(zipFile);
ZipOutputStream zout = null;
try {
    zout = new ZipOutputStream(new BufferedOutputStream(fout));
    if (file.isDirectory()) {
        File[] files = file.listFiles();
        for (int i = 0; i < files.length; i++)
...

byte[] buffer = new byte[1024];
try {
    FileOutputStream fos = new FileOutputStream(output);
    ZipOutputStream zos = new ZipOutputStream(fos);
    ZipEntry ze = new ZipEntry(toZip.getName());
    zos.putNextEntry(ze);
    FileInputStream in = new FileInputStream(toZip);
    int len;
...

JarOutputStream jos = new JarOutputStream(new FileOutputStream(zipFile));
String as[] = dir.list();
if (as != null) {
    for (int i = 0; i < as.length; i++)
        recurseFiles(jos, new File(dir, as[i]), "");
jos.close();

File[] inFiles = new File[inFilePaths.length];
for (int i = 0; i < inFilePaths.length; i++) {
    inFiles[i] = new File(inFilePaths[i]);
makeZip(inFiles, zipFilePath);

ByteArrayOutputStream baos = new ByteArrayOutputStream();
ZipOutputStream zos = new ZipOutputStream(baos);
try {
    for (String fileNameKey : instance.keySet()) {
        String fileName = fileNameKey.split(fileNameSeperator)[0];
        ZipEntry ze = new ZipEntry(fileName);
        zos.putNextEntry(ze);
        zos.write(instance.get(fileNameKey));
...