[英]Writing an InputStream to a File in Java
I am writing this method which will convert an InputStream into a file, but the method is working for some of the inputs but not for all (when i pass a zip file as an InputStream it works). 我正在编写此方法,它将InputStream转换为文件,但是该方法适用于某些输入,但不适用于所有输入(当我将zip文件作为InputStream传递时,它可以工作)。 It simply creates a file with 0 bytes.
它只是创建一个0字节的文件。
I know that this question has been asked before, before anyone mark it as duplicate please go through what i have done so far.. 我知道这个问题已经被问过了,在有人将其标记为重复之前,请仔细阅读我到目前为止所做的事情。
This is what I have tried so far. 到目前为止,这是我尝试过的。 Most of these solutions are found from StackOverFlow.
这些解决方案中的大多数都可以从StackOverFlow中找到。
private void saveFile(String filename, InputStream input) throws IOException
{
if (filename == null) {
return;
}
File file = new File(filename);
//*************** 1st *****************
String stringFromInputStream = IOUtils.toString(input, "UTF-8");
System.out.println("This is inputStream:"+stringFromInputStream);
FileUtils.writeStringToFile(file, StringFromInputStream);
//********************2nd **********************
String stringFromInputStream = IOUtils.toString(input, "UTF-8");
byte[] aByte = StringFromInputStream.getBytes();
FileOutputStream fos=new FileOutputStream(file);
IOUtils.write(aByte, fos);
//*******************3rd**********************
String stringFromInputStream = IOUtils.toString(input, "UTF-8");
byte[] aByte = StringFromInputStream.getBytes();
FileOutputStream fos=new FileOutputStream(file);
fos.write(aByte);
//*********************4th*********************
String stringFromInputStream = IOUtils.toString(input, "UTF-8");
FileWriter fr=new FileWriter(file);
BufferedWriter br=new BufferedWriter(fr);
br.write(StringFromInputStream);
br.flush();
fr.flush();
br.close();
fr.close();
//*************5th**********************
String stringFromInputStream = IOUtils.toString(input, "UTF-8");
Files.write(Paths.get(filename), StringFromInputStream.getBytes());
//************************6th**************
String stringFromInputStream = IOUtils.toString(input, "UTF-8");
FileUtils.writeStringToFile(file, StringFromInputStream);
//******************7th*********************
String stringFromInputStream = IOUtils.toString(input, "UTF-8");
FileWriter fileWriter = new FileWriter(file);
PrintWriter printWriter = new PrintWriter(fileWriter);
printWriter.print(StringFromInputStream);
fileWriter.flush();
fileWriter.close();
//**********************8th*************************
final Path destination = Paths.get(filename);
try (
final InputStream in = input;
) {
Files.copy(in, destination,StandardCopyOption.REPLACE_EXISTING);
}
// ************* This one works but not for all(Sometimes creats a file with 0 bytes) ****************
FileOutputStream fos = new FileOutputStream(file);
BufferedOutputStream bos = new BufferedOutputStream(fos);
BufferedInputStream bis = new BufferedInputStream(input);
int aByte;
while ((aByte = bis.read()) != -1) {
bos.write(aByte);
}
bos.flush();
fos.flush();
bos.close();
fos.close();
bis.close();
........
}
The most of your ways damage the file because of you read InputStream to a String variable (binary files will be damaged). 由于将InputStream读为String变量,大多数方法都会损坏文件(二进制文件将被损坏)。 Try this implementation:
试试这个实现:
byte[] aByte = IOUtils.toByteArray(input);
FileOutputStream fos=new FileOutputStream(file);
IOUtils.write(aByte, fos);
or 要么
FileOutputStream fos=new FileOutputStream(file);
IOUtils.copy(input, fos);
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