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How to replace a carriage return/line feed in Java

Posted on 2002-06-06
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Last Modified: 2012-08-13
Hi, I am trying to replace a carriage return\line feed befeo I enter a string in a sql ststement.

My code is as follows

      if ((((String)requestData.get("emailTemplateSubjectText")).indexOf("\n")) > 0){
        String removedCarriageReturnsText = "";
        while((((String)requestData.get("emailTemplateSubjectText")).indexOf("\n")) > 0) {
          System.err.println("Line break exists in text");
          removedCarriageReturnsText = (String)requestData.get("emailTemplateSubjectText");
          System.err.println("removedCarriageReturnsText = " + removedCarriageReturnsText);
          removedCarriageReturnsText = this.replaceSubstring(removedCarriageReturnsText,"\n","");
          System.err.println("removedCarriageReturnsText2 = " + removedCarriageReturnsText);
          requestData.put("emailTemplateSubjectText", removedCarriageReturnsText);
        }
      }

where replaceSubstring is the following function

  private String replaceSubstring(String original, String existingSubString, String newSubString) {
    StringBuffer buffer = new StringBuffer("");

    buffer.append(original.substring(0, original.indexOf(existingSubString)));
    buffer.append(newSubString);
    buffer.append(original.substring(original.indexOf(existingSubString) + existingSubString.length(), original.length()));

    return buffer.toString();
  }  


However when I do this it does not replace the carriage returns as i require. I know the replacesubstring function works as i have used this in other classes, however I cannot seemt o get it to replace my carriage returns.

Do I need to replace this with the ascii value, and if so then how do I go about this. If not this, then how do I solve my problem?

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Question by:seoirse
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4 Comments
 
LVL 35

Accepted Solution

by:
girionis earned 90 total points
ID: 7059204
First of all I have to tell you thatthe carriage return is represented by the '\r' character sequence.

  Second if you are using jdk1.4 there is already a method in the String class that is called replace and does exactly this; replaces a character with another. Take a look, it might come in handy.

  Hope it helps.
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LVL 19

Expert Comment

by:Jim Cakalic
ID: 7059245
The String.replace method will only substitute one character for one other character as many times as the target character appears in the String. It cannot handle multi-character replacements nor can it remove characters from the String. I've found minimal usefulness in the replace method.

Your problem is that the carriage return/line feed sequence is two characters: "\r\n". If you want to eliminate these from the String then you will want to change your replaceSubstring call to account for both of these characters.

Best regards,
Jim Cakalic
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Author Comment

by:seoirse
ID: 7059348
Cheers for the help. Jim your answer also would have solved my problem also, but it was the \r that I needed to check for that I had forgotten about (as you mentioned also).
Cheers to both of you.
0
 
LVL 35

Expert Comment

by:girionis
ID: 7059360
 Thank you for the points, I am glad I helped :-) (even though I think jim_cakalic is worth half the points as well).
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