读取文本文件并跳过空行，直到达到EOF [英] Reading text file and skipping blank lines until EOF is reached

问题描述

我正在尝试读取包含文本的csv文件；但是，如果中间某行有空白行，则整个过程都会中断，并且我会得到：

I am trying to read csv file full of text; however if there is a blank line in the middle somewhere, the whole thing breaks and I get a:

java.lang.RuntimeException: java.lang.StringIndexOutOfBoundsException

只要不删除空白行，我将如何去做文件的末尾？

How would I go about removing/ignoring blank lines as long as it's not the end of the file?

        file = new FileReader(fileName);
        @SuppressWarnings("resource")
        BufferedReader reader = new BufferedReader(file);
        while ((line = reader.readLine()) != null) {
                     //do lots of stuff to sort the data into lists etc
        }
    } catch (Exception e) {
        System.out.println("INPUT DATA WAS NOT FOUND, PLEASE PLACE FILE HERE: " + System.getProperty("user.dir"));
        throw new RuntimeException(e);
    } finally {
        if (file != null) {
            try {
                file.close();
            } catch (IOException e) {
                // Ignore issues during closing
            }
        }
    }

推荐答案

这是引起问题的部分：

while ((line = reader.readLine()) != null) {

      //do lots of stuff to sort the data into lists etc
      // **** Something assumes line is not empty *******
    }

要忽略空行，请添加此检查以确保行中包含以下内容：

To ignore blank lines, add this check to make sure the line has something:

while ((line = reader.readLine()) != null) {
    if(line.length() > 0) {
      //do lots of stuff to sort the data into lists etc
    }           
}

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