String newvalue = value.replaceAll("%"," "); - 未名空间MITBBS历史存档

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String newvalue = value.replaceAll("%"," ");

String newvalue = value.replaceAll("%"," ");# Java - 爪哇娇娃

l*k2004-12-21 08:12

1 楼

give me java.lang.NullPointerException
what went wrong??? this is in a servlet.
Thanks

w*r2004-12-21 08:12

2 楼

debug it , your value turned out to be null somewhere before this line...

【在 l*****k 的大作中提到】

: give me java.lang.NullPointerException
: what went wrong??? this is in a servlet.
: Thanks

v*e2004-12-21 08:12

3 楼

secondly, you can check to see if it's regular expression error. pretty sure
% is a special char in regular expressions. If it is, you need to escape it.
For example, in order to replace / with \, you need to do
value.replaceAll("/","\\\\");

【在 w*r 的大作中提到】

: debug it , your value turned out to be null somewhere before this line...

c*z2004-12-21 08:12

4 楼

% is not a special char in regular expression.
Even if it was, it throws illegal expression expression
instead of null pointer ones.

【在 v********e 的大作中提到】

:
: secondly, you can check to see if it's regular expression error. pretty sure
: % is a special char in regular expressions. If it is, you need to escape it.
: For example, in order to replace / with \, you need to do
: value.replaceAll("/","\\\\");