java每次读取控制台上按下的每个键 [英] java read every key pressed on console at a time

问题描述

第一次提出问题。

我想要的是每当用户按下控制台上的某个键时发生的一些操作。喜欢，当他键入一个单词，我想要在每个按键，一个字符串形成的所有已经按下的键，打印，连接到新按下的键。如：

a

您键入：a

b

您输入的是：ab

c

您键入的是：abc

d

您键入的是：abcd

e

您输入的是：abcde

使用以下代码：

  try（BufferedReader input = new BufferedReader（
 new InputStreamReader（System.in，UTF -8）））{
 char c = 0; 
 String s =; 
 while（（c =（char）input.read（））！= 13）{
 s + = c; 
 System.out.println（You typed：+ s）; 
} 
} 
  

我得到了我想要的，

您键入的是：f

p>

您键入：fo

您键入：foo

您键入的内容：foob

您键入的内容：fooba

您键入：foobar

提前感谢。

解决方案

看起来其他人问过这个问题。它也似乎是一致的是，修改System.in是不同的平台，为了做你想要的，你将需要将终端从线模式更改为字符模式。

查看此处。

first time making a question.

What I want is a way of every time the user presses a key on the console certains actions take place. Like, as he types a word, I want at every keypress for a String formed by all the keys he's already pressed to be printed, concatenated to the newly pressed key. As in:

a

You typed: a

b

You typed: ab

c

You typed: abc

d

You typed: abcd

e

You typed: abcde

I'm trying to do this with the following code:

try (BufferedReader input = new BufferedReader(
                            new InputStreamReader(System.in, "UTF-8"))) {
    char c = 0;
    String s = "";
    while( (c = (char) input.read() ) != 13) {
        s += c;
        System.out.println("You typed: " + s);
    }
}

I get what I want, but just after I press the Enter key, not as every key pressed on the console:

foobar

You typed: f

You typed: fo

You typed: foo

You typed: foob

You typed: fooba

You typed: foobar

Thanks in advance.

解决方案

It looks like someone else has asked this question. It also looks like that consensus is that modifying System.in is different across platforms and in order to do what you want, you would need to change the terminal from "line" mode to "character" mode.

Take a look Here.

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