Добавление файла в архив с помощью метода putNextEntry()

308

11 мая 2017, 10:57

Объясните пожалуйста, как происходит добавление объекта ZipEntry в архив с помощью метода putNextEntry() класса ZipOutputStream, так как я новичок не получается разобраться в этом методе.

сам метод класса ZipOutputStream:

public void putNextEntry(ZipEntry e) throws IOException {
    ensureOpen();
    if (current != null) {
        closeEntry();       // close previous entry
    }
    if (e.xdostime == -1) {
        // by default, do NOT use extended timestamps in extra
        // data, for now.
        e.setTime(System.currentTimeMillis());
    }
    if (e.method == -1) {
        e.method = method;  // use default method
    }
    // store size, compressed size, and crc-32 in LOC header
    e.flag = 0;
    switch (e.method) {
    case DEFLATED:
        // store size, compressed size, and crc-32 in data descriptor
        // immediately following the compressed entry data
        if (e.size  == -1 || e.csize == -1 || e.crc   == -1)
            e.flag = 8;
        break;
    case STORED:
        // compressed size, uncompressed size, and crc-32 must all be
        // set for entries using STORED compression method
        if (e.size == -1) {
            e.size = e.csize;
        } else if (e.csize == -1) {
            e.csize = e.size;
        } else if (e.size != e.csize) {
            throw new ZipException(
                "STORED entry where compressed != uncompressed size");
        }
        if (e.size == -1 || e.crc == -1) {
            throw new ZipException(
                "STORED entry missing size, compressed size, or crc-32");
        }
        break;
    default:
        throw new ZipException("unsupported compression method");
    }
    if (! names.add(e.name)) {
        throw new ZipException("duplicate entry: " + e.name);
    }
    if (zc.isUTF8())
        e.flag |= EFS;
    current = new XEntry(e, written);
    xentries.add(current);
    writeLOC(current);
}

Answer 1

Надеюсь данный примет тебе поможет.

// Create the ZIP file
ZipOutputStream out = new ZipOutputStream(new FileOutputStream("my.zip"));
// loop through the files to add to zip
for (int i=0; i<filenames.length; i++)
{
// open file
FileInputStream in = new FileInputStream(filenames[i]);
// Add new entry to zip
out.putNextEntry(new ZipEntry(filenames[i]));
// copy file to zip
// see http://helpdesk.objects.com.au/java/how-do-i-copy-one-stream-to-another-using-java
int len;
while ((len = in.read(buf)) >= 0)
{
    out.write(buf, 0, len);
}
// Close the entry and file
out.closeEntry();
in.close();
}
// Close the ZIP file
out.close();