字符串去除所有的空格

 1  private String replaceBlank(String str){
 2     String dest = null;
 3     if(str == null){
 4       return dest;
 5     }else{
 6       Pattern p = Pattern.compile("\\s*|\t|\r|\n");
 7       Matcher m = p.matcher(str);
 8       dest = m.replaceAll("");
 9       return dest;
10     }
11   }