Integer.parseInt does not parse String to int

Question

The code below is from a Servlet trying to read data from a submitted html form. The variable fieldValue is a String and prints correct value (like so BizStr: 5) but when I try to parse this value to integer, it does not print anything.

for(FileItem uploadItem : uploadItems){
  if(uploadItem.isFormField()){
    String fieldName = uploadItem.getFieldName();
    String fieldValue = uploadItem.getString();
    if(fieldName.equals("business_id")){
        out.println("BizStr: "+ fieldValue +"\n");
        out.println("BizInt: "+ Integer.parseInt(fieldValue )+"\n");
    }
  }
}

Why is this string not being parsed into integer?

I'd suspect there's an extra space there or something, Integer.parseInt throws a NumberFormatException, which gets eaten somewhere — iluxa
– iluxa, Commented May 1, 2013 at 23:10
Can you please do out.println("BizInt: "+ Arrays.toString(fieldValue.toCharArray())+"\n"); and edit what that does into your answer — durron597
– durron597, Commented May 1, 2013 at 23:10
@iluxa made a good guess, it may be white space. The following code should strip whitespace (including non-visible characters) from your string if you want to try it. fieldValue.replaceAll("\\s","") (Note, that won't change the value of the variable, it will just return it. So you can use that code inside your parseInt call or do fieldValue = fieldValue.replaceAll("\\s","");) — Kyle
– Kyle, Commented May 1, 2013 at 23:13
@Kyle kinda embarrassed, yes you are right, it is due to whitespace. thank you all — Sushan Ghimire
– Sushan Ghimire, Commented May 1, 2013 at 23:17

rgettman · Accepted Answer · 2013-05-01 23:18:51Z

10

Testing:

Integer.parseInt(" 5");  // space before; yields NumberFormatException

Integer.parseInt("5 ");  // space after; yields NumberFormatException

Try trim() on the fieldValue before parsing:

out.println("BizInt: "+ Integer.parseInt(fieldValue.trim() )+"\n");

answered May 1, 2013 at 23:18

rgettman

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2 Comments

Uncle Iroh Over a year ago

he did say there was no exception, but trimming is a good suggestion all the same.

Kyle Over a year ago

Another note to add to the conversation going on in the comments, this answer is probably a better answer than my replaceAll comment depending on how the number is being used. This will trim trailing and leading whitespace, so ` 5 ` would be acceptable, but 5 5 would still thrown an exception alerting you to a problem. If you don't care and want to try and parse all the numbers even if a space is in the middle, the replaceAll is better.

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