Java获取Zip文件内容

Question

My problem is that I want to see if a file is in a zip file. So I have made this code :

File zipf = new File(backupFolder, dfws.format(new Date()) + ".zip");
                        if (!zipf.exists()) zipf.createNewFile();
                        fs = new FileOutputStream(zipf);
                        ZipOutputStream zos = new ZipOutputStream(fs);
                        System.out.println("size : " + zipf.length());
                        if (zipf.length() > 0) {
                            ZipFile zf = new ZipFile(zipf);

                            System.out.println("entry : " + zf.getEntry(name));
                            if (zf.getEntry(name) != null) {
                                int index = 1;
                                while (zf.getEntry(index + "_" + name) != null) {
                                    index++;
                                }
                                name = index + "_" + name;
                            }

                            zf.close();
                        }
                        System.out.println("index found : " + name);

But the problem is that the length of the file is always 0. And I can't create an instance of ZipFile if the zip file doesn't have files inside.

Answer 1

感谢RealSkeptic：创建ZipFile之后，我不得不打开FileOutputStream。