java上传.zip的文件并覆盖。

public void uploadFile() throws Exception {
    File fileTemp=new File(path);
    ZipFile zf = new ZipFile(fileTemp, "GBK");//支持中文  
        Enumeration enu = zf.getEntries();
        while (enu.hasMoreElements()) {
            ZipEntry entry = (ZipEntry) enu.nextElement();
            String name = entry.getName();
            //如果解压entry是目录,直接生成目录即可,不用写入,如果是文件,要将文件写入
            String path = "c:/On/Bin/" + name;
            File file = new File(path);
            if (entry.isDirectory()) {
                file.mkdirs();
            } else {
                InputStream is = zf.getInputStream(entry);
                byte[] buf1 = new byte[1024];
                int len;

                if (!file.exists()) {
                    file.getParentFile().mkdirs();
                    file.createNewFile();
                }else{
                file.delete();
                }
                OutputStream out = new FileOutputStream(file);
                while ((len = is.read(buf1)) > 0) {
                    String buf = new String(buf1, 0, len);
                    out.write(buf1, 0, len);
                }
                is.close();
                out.close();
            }
        } 
     // 关闭流
    }