Can BufferedReader（Java）可以在不移动指针的情况下读取下一行吗？ [英] Can BufferedReader (Java) read next line without moving the pointer?

问题描述

我试图在不移动指针的情况下阅读下一行，这可能吗？

I am trying to read next next line without moving the pointer, is that possible?

BufferedReader buf = new BufferedReader(new InputStreamReader(fileIS));

while ((readString = buf.readLine()) != null) {
}

虽然我会想要逐行阅读，但我需要写下当前行的下一行。

the While will read line by line as i want, but i need to write the next line of the current line.

这是可能的？

我的文件包含Http请求数据，第一行是GET请求，第二行是
主机名，我需要拉在GET之前将主机连接在一起。

主机/ + GET网址，

my file contain Http request data, the first line is the GET request,
in the second line the Host name, i need to pull out the Host before the GET to be able to connect it together.
Host/+the GET url,

GET /logos/2011/family10-hp.jpg HTTP/1.1  
Host: www.google.com  
Accept-Encoding: gzip  

谢谢。

推荐答案

您可以使用 mark（）和 reset（）标记流中的一个点然后返回它。示例：

You can use mark() and reset() to mark a spot in the stream and then return to it. Example:

int BUFFER_SIZE = 1000;

buf.mark(BUFFER_SIZE);
buf.readLine();  // returns the GET
buf.readLine();  // returns the Host header
buf.reset();     // rewinds the stream back to the mark
buf.readLine();  // returns the GET again

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