无法使用java代码将文件从一个地方传输到另一个地方
我正在使用如下所示的内容：
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(targerFile);
HttpResponse response = httpclient.execute(httpGet);
// get the response body as an array of bytes
HttpEntity entity = response.getEntity();
// write for the destination file
InputStream instream = null;
if (entity != null) {
instream = entity.getContent();
ByteArrayOutputStream bytOut = new ByteArrayOutputStream();
int x;
do {
x = instream.read();
if (x != -1) {
bytOut.write(x);
instream.close();
bytOut.close();
}
} while (x != -1);
FileOutputStream fout = new FileOutputStream(destinationFile);
fout.write(bytOut.toByteArray());
fout.close();
但只有那时我才发现来自 httpclient 的输入流已关闭。所以我无法多次阅读它。有什么解决办法吗？或者这不是正确的方法？
I am using somehting like below :
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(targerFile);
HttpResponse response = httpclient.execute(httpGet);
// get the response body as an array of bytes
HttpEntity entity = response.getEntity();
// write for the destination file
InputStream instream = null;
if (entity != null) {
instream = entity.getContent();
ByteArrayOutputStream bytOut = new ByteArrayOutputStream();
int x;
do {
x = instream.read();
if (x != -1) {
bytOut.write(x);
instream.close();
bytOut.close();
}
} while (x != -1);
FileOutputStream fout = new FileOutputStream(destinationFile);
fout.write(bytOut.toByteArray());
fout.close();
but only then i find out the inputstream from httpclient comes closed. so there is no way i can read it more than once. is there any work around for this? or is this not the correct way to do it?
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使用 org.apache.http.util.EntityUtils：使用
commons-io 中的 FileUtils 将该字节数组写入文件：
use org.apache.http.util.EntityUtils:
write that bytearray to a file with FileUtils from commons-io:
不要关闭循环内的流。读取整个输入流后，在循环外部执行此操作。
do not close the streams inside the loop. do that outside the loop after the entire input stream is read.
在我看来，您在读取 1 个字节后关闭了 bytOut 流。但我会做这样的事情：
it looks to me like you're closing your bytOut stream after 1 byte is read. But I would do something like this instead:
首先，您的问题是在读取第一个字节后关闭循环中的输入流。不要那样做。
其次，如果您要做的只是将其写入
FileOutputStream，则写入 ByteArrayOutputStream 是没有意义的。而是直接写入文件。第三，使用
byte[]和BufferedInputStream和BufferedOutputStream以便一次读取更多字节。第四，忽略上述内容，仅使用 commons-io。
First, your problem is that you're closing the input stream in the loop after the first byte is read. Don't do that.
Second, there is no point in writing to a
ByteArrayOutputStreamif all you're going to do is to just write it to aFileOutputStream. Write directly to the file instead.Third, use a
byte[]andBufferedInputStreamandBufferedOutputStreamso you read more bytes at a time.Fourth, disregard the above and just use commons-io.