java去除字符串中的空格、回车、换行符、制表符

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class StringUtil {

public static void replaceBlank()

{

Pattern p = Pattern.compile("//s*|/t|/r|/n");

String str="I am a, I am Hello ok, /n new line ffdsa!";

System.out.println("before:"+str);

Matcher m = p.matcher(str);

String after = m.replaceAll("");

System.out.println("after:"+after);

}