如何从reader.readLine（）返回的String中删除unicode空格

Question

I when i use reader.readLine(), the string length is always 80 chars and after the main string unicode spaces are padded up. Is there a way to remove those unwanted characters. (java.io.RandomAccessFile reader) String.trim is not working on this

Answer 1

You can use StringUtils.strip from Commons Lang. It is Unicode-aware.

Answer 2

You can write a custom method in Java to remove the Unicode space characters , using Character.isWhitespace(char) and Character.isSpaceChar(char) methods, for your specific purpose.

The Spring framework has a StringUtils class with a trimWhitespace(String) method which appears to be based on Character.isWhitespace(char) from the source code here .

Answer 3

use Google Guava

CharMatcher.WHITESPACE.trimFrom(source);

or try this https://gist.github.com/michalbcz/4861a2b8ed73bb73764e909b87664cb2

Answer 4

If you do not want a big libs. Just use:

str.replaceAll("^[\\\\s\\\\p{Z}]+|[\\\\s\\\\p{Z}]+$", "");

Testing

    public static String trim(String str) {
        return str.replaceAll("^[\\s\\p{Z}]+|[\\s\\p{Z}]+$", "");
    }

    public static void main(String[] args) {
        System.out.println(trim("\t tes ting \u00a0").length());
        System.out.println(trim("\t testing \u00a0").length());
        System.out.println(trim("tes ting \u00a0").length());
        System.out.println(trim("\t tes ting").length());
    }

Answer 5

would have been faster to just search stackoverflow for this question becoz there are multiple questions on that topic there. well, try this:

st.replaceAll("\\s","")

check this one here: link