public
static
String filterEmoji(String source) {
if
(source !=
null
)
{
Pattern emoji = Pattern.compile (
"[\ud83c\udc00-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\u2600-\u27ff]"
,Pattern.UNICODE_CASE | Pattern . CASE_INSENSITIVE ) ;
Matcher emojiMatcher = emoji.matcher(source);
if
( emojiMatcher.find())
{
source = emojiMatcher.replaceAll(
"*"
);
return
source ;
}
return
source;
}
return
source;
}
如果没有改变的话，可以在该类中书写以下代码：
private static final long serialVersionUID = -5916500037685553487L;
public void destroy() {
// TODO Auto-generated method stub
}
@SuppressWarnings("unchecked")
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain arg2) throws IOException, ServletException {
HttpServletRequest servletrequest = (HttpServletRequest) request;
//新加代码http://www.2cto.com/kf/201512/455191.html
HttpServletResponse servletresponse = (HttpServletResponse) response;
String param = "";
String paramValue = "";
servletresponse.setContentType("text/html");
servletresponse.setCharacterEncoding("UTF-8");
servletrequest.setCharacterEncoding("UTF-8");
java.util.Enumeration params = request.getParameterNames();
while (params.hasMoreElements()) {
param = (String) params.nextElement();
String[] values = servletrequest.getParameterValues(param);//获得每个参数的value
for (int i = 0; i < values.length; i++) {
paramValue = values[i];
paramValue = paramValue.replaceAll("<script>", "(*");
paramValue = paramValue.replaceAll("</script>", ")");
paramValue = paramValue.replaceAll("[\ud83c\udc00-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\u2600-\u27ff]", ""); //过滤emoji表情
//这里还可以增加，如领导人 自动转义成****,可以从数据库中读取非法关键字。
values[i] = paramValue;
}
//把转义后的参数重新放回request中
request.setAttribute(param, paramValue);
}
//继续向下
arg2.doFilter(request, response);
}
public void init(FilterConfig arg0) throws ServletException {
// 初始化
}
}
public static String filterEmoji(String source) {
if (!containsEmoji(source)) {
return source;// 如果不包含，直接返回
}
StringBuilder buf = null;
int len = source.length();
for (int i = 0; i < len; i++) {
char codePoint = source.charAt(i);
if (!isEmojiCharacter(codePoint)) {
if (buf == null) {
buf = new StringBuilder(source.length());
}
buf.append(codePoint);
} else {
}
}
if (buf == null) {
return "";
} else {
if (buf.length() == len) {// 这里的意义在于尽可能少的toString，因为会重新生成字符串
buf = null;
return source;
} else {
return buf.toString();
}
}
}
// 判别是否包含Emoji表情
private static boolean containsEmoji(String str) {
int len = str.length();
for (int i = 0; i < len; i++) {
if (isEmojiCharacter(str.charAt(i))) {
return true;
}
}
return false;
}
private static boolean isEmojiCharacter(char codePoint) {
return !((codePoint == 0x0) ||
(codePoint == 0x9) ||
(codePoint == 0xA) ||
(codePoint == 0xD) ||
((codePoint >= 0x20) && (codePoint <= 0xD7FF)) ||
((codePoint >= 0xE000) && (codePoint <= 0xFFFD)) ||
((codePoint >= 0x10000) && (codePoint <= 0x10FFFF)));
}
