我正在下载一些.zip文件,但是当我尝试解压缩它们时,我收到“数据错误”..现在我去看了下载的文件,它们比原来大。这可能是错误的原因吗?
下载文件的代码:
URL=intent.getStringExtra("DownloadService_URL");
FileName=intent.getStringExtra("DownloadService_FILENAME");
Path=intent.getStringExtra("DownloadService_PATH");
try{
URL url = new URL(URL);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
lenghtOfFile/=100;
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(Path+FileName);
byte data[] = new byte[1024];
long total = 0;
int count = 0;
while ((count = input.read(data)) != -1) {
output.write(data);
total += count;
notification.setLatestEventInfo(context, contentTitle, "Starting download " + FileName + " " + (total/lenghtOfFile), contentIntent);
mNotificationManager.notify(1, notification);
}
output.flush();
output.close();
input.close();
Unzip代码:
try {
String zipFile = Path + FileName;
FileInputStream fin = new FileInputStream(zipFile);
ZipInputStream zin = new ZipInputStream(fin);
ZipEntry ze = null;
while ((ze = zin.getNextEntry()) != null) {
UnzipCounter++;
if (ze.isDirectory()) {
dirChecker(ze.getName());
} else {
FileOutputStream fout = new FileOutputStream(Path
+ ze.getName());
while ((Unziplength = zin.read(Unzipbuffer)) > 0) {
fout.write(Unzipbuffer, 0, Unziplength);
}
zin.closeEntry();
fout.close();
}
}
zin.close();
File f = new File(zipFile);
f.delete();
notification.setLatestEventInfo(context, contentTitle, "File successfully downloaded", contentIntent);
mNotificationManager.notify(1, notification);
} catch (Exception e) {
notification.setLatestEventInfo(context, contentTitle, "Problem in downloading file ", contentIntent);
mNotificationManager.notify(1, notification);
}
}
解压缩进程启动但在提取一些带有该错误的文件后停止..我尝试了另一个.zip文件,我得到CRC失败错误..我用winrar测试了两个.zip文件..
原始文件大小:3.67mb ..下载文件大小:3.93mb
答案 0 :(得分:1)
您始终将完整的字节数组写入磁盘,而不检查您读取了多少数据。
同样从性能的角度来看,任何< 1500byte(即通常的以太网MTU)都是一个非常糟糕的主意 - 虽然我认为Java无论如何都要缓存,但为什么要冒任何风险。