BufferedInputStream mark() 和reset()

 

本文系摘抄：

a.txt 内容 01234567890

 

BufferedInputStream in = new BufferedInputStream(new FileInputStream(

new File("a.txt")),8);

int s = -1;

// String str = "";

int count = 0;

while ((s = in.read()) != -1) {

System.out.print((char) s);

if (count == 4) {

in.mark(12);

break;

}

s = -1;

count++;

}

System.out.println();

in.reset();

while ((s = in.read()) != -1) {

System.out.print((char) s);

}

System.out.println();

in.reset();

while ((s = in.read()) != -1) {

System.out.print((char) s);

}

System.out.println();

 

in.close();

 

 

 

 

 

mark(int readlimit);

在mark后再read，如果读到的字节数大于BufferedInputStream缓冲区大小，那么你就再不能回到标记的位置，而readlimit如果大于BufferedInputStream缓冲区大小，那么BufferedInputStream会重置缓冲大小为readlimit；