import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringUtils {

    public static String replaceBlank(String str){
        String newStr = "";

        if(str != null){
            Pattern p = Pattern.compile("\\s");
            Matcher m = p.matcher(str);
            newStr = m.replaceAll(""
 
);
        }

        return newStr;
    }

    public static void main(String[] args) {
        String str = "abc\tabc\nabc abc\rabc";
        System.out.println("---------去除\\t,\\n,\\r,空格前---------\n");
        System.out.println(str);
        System.out.println("\n---------去除\\t,\\n,\\r,空格後---------\n"
 
);
        System.out.println(StringUtils.replaceBlank(str));
    }
}