缓冲读取器readLine（）与空行 [英] Buffered Reader readLine() with Empty lines

问题描述

我正在使用缓冲读卡器从文本文件中一次抓取一行。我也试图使用跟踪整数从文本文件中获取行号。不幸的是， BufferedReader 正在跳过空行（只有 / n 或回车符）。

I am using buffered reader to grab a line at a time from a text file. I am trying to also get the line number from the text file using a tracking integer. Unfortunately BufferedReader is skipping empty lines (ones with just /n or the carriage return).

有没有更好的方法来解决这个问题？是否使用扫描仪工作？

Is there a better way to solve this? Would using scanner work?

示例代码：

int lineNumber = 0;
while ((s = br.readLine()) != null) {
    this.charSequence.add(s, ++lineNumber);
}

推荐答案

我无法重现您的申请 BufferedReader 跳过空行;它不应该有。

I could not reproduce your claim that BufferedReader skips empty lines; it should NOT have.

以下是一些片段，表明不会跳过空行。

Here are snippets to show that empty lines aren't just skipped.

    String text = "line1\n\n\nline4";
    BufferedReader br = new BufferedReader(new StringReader(text));
    String line;
    int lineNumber = 0;
    while ((line = br.readLine()) != null) {
        System.out.printf("%04d: %s%n", ++lineNumber, line);
    }

java.io.LineNumberReader

java.io.LineNumberReader

    String text = "line1\n\n\nline4";
    LineNumberReader lnr = new LineNumberReader(new StringReader(text));
    String line;
    while ((line = lnr.readLine()) != null) {
        System.out.printf("%04d: %s%n", lnr.getLineNumber(), line);
    }

java.util.Scanner

java.util.Scanner

    String text = "line1\n\n\nline4";
    Scanner sc = new Scanner(text);
    int lineNumber = 0;
    while (sc.hasNextLine()) {
        System.out.printf("%04d: %s%n", ++lineNumber, sc.nextLine());
    }

上述任何一个片段的输出是：

The output for any of the above snippets is:

0001: line1
0002: 
0003: 
0004: line4

相关问题

• 如何使用扫描仪获取行号 - LineNumberReader + 扫描仪组合！


• 如何读取每行的字符串行数


• 在Java中，如何从文件中读取特定的行，给定行号？


• 从文本文件中读取特定行


• 使用 java.util.Scanner 验证输入 - 有很多例子


• 做什么这些符号字符串表示：％02d％01d ？



Related questions

• How to get line number using scanner - a LineNumberReader + Scanner combo!
• How to read a string line per line
• In Java, how to read from a file a specific line, given the line number?
• Read a specific line from a text file
• Validating input using java.util.Scanner - has many examples
• what do these symbolic strings mean: %02d %01d ?

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