我有一个问题，我似乎无法解决...我对文件进行了 http 下载，但服务器和客户端上文件的 CRC32 不匹配。另外，文件的大小不同，所以很明显我一定做错了什么……当我通过 Firefox 下载时，文件大小还可以……所以我猜它在客户端代码中的某个地方。
我在使用 Java 下载文件时已经发现Corrupt 文件，但这对我也没有帮助......
这是代码：
private void downloadJar(String fileName, long crc32Server) throws IOException {
System.out.println("Downloading file '" + fileName + "' from server '" + mServer + "'.");
HttpURLConnection sourceConnection = null;
BufferedInputStream inputStream = null;
BufferedWriter fileWriter = null;
long crc32Client;
try {
URL sourceURL = new URL(fileName);
try {
sourceConnection = (HttpURLConnection)sourceURL.openConnection();
}
catch (MalformedURLException exc) {
throw new RuntimeException("Configured URL caused a MalformedURLException: ", exc);
}
sourceConnection.setRequestProperty("Accept-Encoding", "zip, jar");
sourceConnection.connect();
inputStream = new BufferedInputStream(sourceConnection.getInputStream());
fileWriter = new BufferedWriter(new FileWriter(targetFolder + File.separator + fileName));
CRC32 crc32 = new CRC32();
for (int singleByte = inputStream.read(); singleByte != -1; singleByte = inputStream.read()) {
fileWriter.write(singleByte);
crc32.update(singleByte);
}
crc32Client = crc32.getValue();
}
finally {
if (inputStream != null) {
inputStream.close();
}
if (fileWriter != null) {
fileWriter.flush();
fileWriter.close();
}
if (sourceConnection != null) {
sourceConnection.disconnect();
}
}
if (crc32Client != crc32Server) {
// deleteFile(fileName);
throw new IOException("CRC32 did not match for file '" + fileName + "': " + crc32Client + "!="
+ crc32Server);
}
}