Java扫描程序-下一个字符串，直到|被发现 [英] Java Scanner - next String until a | is found

问题描述

目前，我正在尝试阅读以下格式的一些基本单元格:

Currently I'm trying to read through some basic cells, in this format:

+-------+-------+
|       |       |
+-------+-------+

现在，我需要获取单元格内容的字符串表示形式并将其发送给另一种方法.问题在于单元格没有预定义的长度.我正在从文件中读取这些信息，因此我最简单的选择应该是仅使用已经设置的扫描仪.问题是，我真的不知道如何处理这种情况.

Now I need to get the string representation of the cell's contents and send it off to another method. The problem is that the cells have no pre-defined length. I'm reading these from a file, so my easiest option should be to just use the Scanner I already have set up. Problem is, I don't really know how for this case.

我有强烈的感觉，我需要以某种方式使用该模式，但是我完全不知道该怎么做.

I have a strong feeling that I need to use the pattern somehow, but I'm at a complete loss on how to do it.

我也可能会以某种方式构建它，但这让我感到非常缓慢.

I could also probably just build it up somehow, but that strikes me as being painfully slow.

推荐答案

请参见扫描仪的Javadoc ，其中有一个示例:

See javadoc for Scanner, it has an example :

String input = "1 fish 2 fish red fish blue fish";
 Scanner s = new Scanner(input).useDelimiter("\\s*fish\\s*");
 System.out.println(s.nextInt());
 System.out.println(s.nextInt());
 System.out.println(s.next());
 System.out.println(s.next());
 s.close(); 

打印以下输出:

 1
 2
 red
 blue 

那么您可以使用|作为分隔符.

Well you can use | as delimiter.

要将|用作分隔符，应使用\\s*\\|\\s*或\\s*[|]\\s*对其进行转义.如果按原样使用|，则将仅获得第一个值1和异常InputMismatchException.

EDIT : To use | as a delimiter you should escape it, Use \\s*\\|\\s* or \\s*[|]\\s*. If you use | as it is, then you will get only 1st value 1 and exception InputMismatchException.

请参见下面的程序和输出:

See below program and output :

public class Test {
    public static void main(String[] args) {
        String input = "1 | 2 | red | blue |";
        Scanner s = new Scanner(input).useDelimiter("\\s*\\|\\s*"); // or use "\\s*[|]\\s*"
        System.out.println(s.nextInt());
        System.out.println(s.nextInt());
        System.out.println(s.next());
        System.out.println(s.next());
        s.close();
    }
}

输出:

1
2
red
blue

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