1.过滤字符串中的空白字符，可以移除tab，回车等空白字符
str.replaceAll("\\s+","");
2.过滤中文标点符号
str = str.replaceAll("(?i)[^a-zA-Z0-9\u4E00-\u9FA5]","");
3.去除 Linux的非法文件字符
public static String cleanFileName(String badFileName) {
final int[] illegalChars = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,34,42,47,58,60,62,63,92,124};
StringBuilder cleanName = new StringBuilder();
for (int i = 0; i < badFileName.length(); i++) {
int c = (int)badFileName.charAt(i);
if (Arrays.binarySearch(illegalChars,c) < 0) {
cleanName.append((char)c);
}
}
return cleanName.toString();
}