如何从文本文件中删除逗号？

Question

我已经走到这里了，但似乎缓冲区不会接受数组，因为首先我是这样的，

while ((strLine = br.readLine()) != null)   
{
  // Print the content on the console
 // System.out.println (strLine);
   String Record = strLine;
  String delims = "[,]";
  String[] LineItem = Record.split(delims);

  //for (int i = 0; i < LineItem.length; i++)
      for (int i = 0; i == 7; i++)
  {
    System.out.print(LineItem[i]);
  }

现在我离开这里，因为它正在读取但不取出逗号。

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.IOException;

public class mainPro1test {
    public static void main(String[] args) {
        File file = new File("test.txt");
        StringBuffer contents = new StringBuffer();
        BufferedReader reader = null;

        try {
            reader = new BufferedReader(new FileReader("C:\\2010_Transactions.txt"));
            String text = null;

            // repeat until all lines is read
            while ((text = reader.readLine()) != null) {

                String Record = text;
                String delims = "[,]";
                String[] LineItem = Record.split(delims);

                contents.append(text)
                    .append(System.getProperty(
                        "line.separator"));


            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        // show file contents here       
        System.out.println(contents.toString());
    }
}

应该是什么样子

输入

Sell,400,IWM   ,7/6/2010,62.481125,24988.02,4.43
Sell,400,IWM   ,7/6/2010,62.51,24999.57,4.43

输出

Sell    400    IWM    7/6/2010    62.481125    24988.02    4.43
Sell    400    IWM    7/6/2010    62.51        24999.57    4.43

Answer 1

如果您只想从字符串中删除逗号，可以使用 String.replaceAll(",","");
如果您想用空格替换它们，请使用 String.replaceAll(","," ")：

while ((text = reader.readLine()) != null) {
    contents.append(text.replaceAll(","," ");
}

另外，在您的代码中，您似乎分割了输入，但不使用此操作的结果。

Answer 2

更简单的是定义一个新的 InputStream ，只需删除逗号...

class CommaRemovingStream extends InputStream {
  private final InputStream underlyingStream;

  // Constructor

  @Override public int read() throws IOException {
    int next;

    while (true) {
      next = underlyingStream.read();
      if (next != ',') {
        return next;
      }
    }
  }
}

现在您可以读取不带逗号的文件：

InputStream noCommasStream = new CommaRemovingStream(new FileInputStream(file));