无限循环读取Java输入流
我有一个关于java的InputStream的问题。
我正在从如下文件中读取数据：
FileInputStream xfis = new FileInputStream('filename')
int size = xfis.avaliable();
int len = 0 ;
byte[] buffer new byte[size];
while( (len = xfis.read(buffer) > -1 )
(
// process some logic
)
xfis.close();
....
并且每分钟运行一个批处理程序：
FileOutputStream fos = new FileOutputStream('filename')
FileLock flock = fos.getChannel().tryLock();
if(flock != null){
fos.write()
flock.release();
}
fos.close();
...
当两个程序同时读写时，读取文件的程序会陷入无限循环。
我该如何解决这个问题？
谢谢
I have a question about java's InputStream.
I am reading data from a file like below:
FileInputStream xfis = new FileInputStream('filename')
int size = xfis.avaliable();
int len = 0 ;
byte[] buffer new byte[size];
while( (len = xfis.read(buffer) > -1 )
(
// process some logic
)
xfis.close();
....
And also running a batch program every minute:
FileOutputStream fos = new FileOutputStream('filename')
FileLock flock = fos.getChannel().tryLock();
if(flock != null){
fos.write()
flock.release();
}
fos.close();
...
When both programs read and write at the same time the program that reads the file gets stuck in an infinite loop.
How can I solve that problem?
Thanks
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xfis.avialable()返回0。当您尝试读取零长度缓冲区时，您总是会成功并获得读取长度0，而不是-1。缓冲区大小应与可用字节数无关。您可以使用 xfis.read 返回的值来确定缓冲区的填充量。试试这个：
xfis.avialable()is returning0. When you try to read into a zero-length buffer, you always succeed and get a read length of0, not-1. Buffer sizes should be independent of how many bytes are available. You use the value returned byxfis.readto determine how much of the buffer was filled.Try this: