public class RequestFilter implements Filter {
private final Logger logger = LoggerFactory.getLogger(RequestWrapper.class);
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
RequestWrapper requestWrapper = new RequestWrapper(request);
if (request.getMethod().equals("POST")) {
logger.debug("开始过滤请求中的表情字符");
requestWrapper.emojiFilter();
}
filterChain.doFilter(requestWrapper, servletResponse);
}
@Override
public void destroy() {
}
class RequestWrapper extends HttpServletRequestWrapper {
private Map<String, String[]> paramMap;
RequestWrapper(HttpServletRequest request) {
super(request);
paramMap = new HashMap<>();
paramMap.putAll(request.getParameterMap());
}
@Override
public String getParameter(String name) {
String[] values = paramMap.get(name);
if (values == null || values.length == 0) {
return null;
}
return values[0];
}
@Override
public String[] getParameterValues(String name) {
return paramMap.get(name);
}
@Override
public Enumeration<String> getParameterNames() {
return new Enumeration<String>() {
private Iterator<String> iterator = paramMap.keySet().iterator();
@Override
public boolean hasMoreElements() {
return iterator.hasNext();
}
@Override
public String nextElement() {
return iterator.next();
}
};
}
@Override
public Map<String, String[]> getParameterMap() {
return paramMap;
}
private void resetParamMap(String key, String[] value) {
paramMap.put(key, value);
}
//过滤表情
void emojiFilter() {
for (String key : paramMap.keySet()) {
String[] valueSet = paramMap.get(key);
if (BeanUtil.nonNull(valueSet) && valueSet.length > 0) {
logger.debug("过滤前:" + valueSet[0]);
valueSet[0] = EmojiFilter.filterEmoji(valueSet[0]);
logger.debug("过滤后:" + valueSet[0]);
resetParamMap(key, valueSet);
}
}
}
}
}
来源: http://www.cnblogs.com/microbear/p/7346076.html