java 有没有办法创建带有标记功能的 FileInputStream？
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Is there a way to create FileInputStream with mark feature?
提问by Roshan
Is there any possible way to create FileInputStreamwith mark supported feature as true?
是否有任何可能的方法来创建FileInputStream标记支持的功能为true？
采纳答案by Suraj Chandran
Wrap your Fileinputstream inside a BufferedInputStream.
将您的 Fileinputstream 包裹在BufferedInputStream 中。
The buffered streams support marks.
缓冲的流支持标记。
回答by iluxa
Wrap it in BufferedInputStream.
把它包起来BufferedInputStream。
instead of
代替
FileInputStream fis = new FileInputStream(...);
do this:
做这个：
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(...));
and use bisinstead of fis; nothing else should have to change in your code.
并使用bis代替fis；您的代码中不应有任何其他更改。
回答by benleis
BufferedInputStreams are not magic. They will only support marking for as large as their underlying buffers and these buffers are going to take up memory. So if you go down this route its important that you understand the usage case and potentially call the BufferedInputStream constructor with the appropriatedly sized buffer. If the underlying file starts to get large and you mark far enough back then this technique may not work for you.
BufferedInputStreams 并不神奇。它们将仅支持与其底层缓冲区一样大的标记，并且这些缓冲区将占用内存。因此，如果您沿着这条路线走下去，重要的是您了解用例并可能使用适当大小的缓冲区调用 BufferedInputStream 构造函数。如果底层文件开始变大并且您标记回足够远，那么这种技术可能对您不起作用。
回答by Franky
Try something like this
尝试这样的事情
public FileInputStream fstream;
public DataInputStream in;
public BufferedInputStream bs;
public String path;
public void myExample() throws IOException{
path = "yourPath";
try {
fstream = new FileInputStream(path);
in = new DataInputStream(fstream);
bs = new BufferedInputStream(new InputStreamReader(in));
//do something
br.close(); //when do something is completed
} catch (FileNotFoundException ex) {
JOptionPane.showMessageDialog(null, "File not found");
}
}
