我找到了一次......它创建一个临时文件,并在添加额外文件之前将现有zip文件中的所有文件添加到“新”zip文件中。如果两个文件具有相同的名称,则只会添加“最新”的文件。
public static void addFilesToExistingZip(File zipFile,
File[] files) throws IOException {
// get a temp file
File tempFile = File.createTempFile(zipFile.getName(), null);
// delete it, otherwise you cannot rename your existing zip to it.
tempFile.delete();
boolean renameOk=zipFile.renameTo(tempFile);
if (!renameOk)
{
throw new RuntimeException("could not rename the file "+zipFile.getAbsolutePath()+" to "+tempFile.getAbsolutePath());
}
byte[] buf = new byte[1024];
ZipInputStream zin = new ZipInputStream(new FileInputStream(tempFile));
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile));
ZipEntry entry = zin.getNextEntry();
while (entry != null) {
String name = entry.getName();
boolean notInFiles = true;
for (File f : files) {
if (f.getName().equals(name)) {
notInFiles = false;
break;
}
}
if (notInFiles) {
// Add ZIP entry to output stream.
out.putNextEntry(new ZipEntry(name));
// Transfer bytes from the ZIP file to the output file
int len;
while ((len = zin.read(buf)) > 0) {
out.write(buf, 0, len);
}
}
entry = zin.getNextEntry();
}
// Close the streams
zin.close();
// Compress the files
for (int i = 0; i < files.length; i++) {
InputStream in = new FileInputStream(files[i]);
// Add ZIP entry to output stream.
out.putNextEntry(new ZipEntry(files[i].getName()));
// Transfer bytes from the file to the ZIP file
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
// Complete the entry
out.closeEntry();
in.close();
}
// Complete the ZIP file
out.close();
tempFile.delete();
}
编辑: 我觉得这是超过2岁,所以可能有些事情是不是真的是最新的了。
这是我的示例代码: ZipOutputStream zip = null; \t \t FileOutputStream fileWriter = null; \t \t fileWriter = new FileOutputStream(destZipFile); \t \t zip = new ZipOutputStream(fileWriter); \t \t zip.putNextEntry(new ZipEntry(destFilePath)); \t \t \t zip.write(content); \t \t zip.flush(); \t \t zip.close(); – stanley 2010-02-02 10:09:48
自从'close()'调用'flush()'本身之后,在调用'close()'时不需要调用'flush()'。 – uckelman 2010-02-02 12:17:21