@Override
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
throws IOException, ServletException {
req.setCharacterEncoding("UTF-8");
resp.setCharacterEncoding("UTF-8");
resp.setLocale(Locale.getDefault());
chain.doFilter(req, resp);
}
/** Sets up the charset for the request and response based on
* {@link #getPreferredLocale(HttpSession,ServletRequest)}. After setting up, you shall invoke
* {@link #cleanup} before exiting.
*
* <pre><code> final Object old = setup(request, response, null);
* try {
* ....
* } finally {
* cleanup(request, old);
* }
*
* <p>It is OK to call this method multiple time, since it is smart
* enough to ignore redundant calls.
*
* <p>{@link CharsetFilter} actually use this method to setup
* the proper charset and locale. By mapping {@link CharsetFilter} to
* all servlets, the encoding charset could be prepared correctly.
* However, if you are writing libraries to be as independent of
* web.xml as possible, you might choose to invoke this method directly.
*
* @param sess the session to look for the preferred locale. Ignored if null.
* @param charset the response's charset. If null or empty,
* response.setCharacterEncoding won't be called, i.e., the container's
* default is used.
* @return an object that must be passed to {@link #cleanup}
*/
public static final Object setup(
HttpSession sess, ServletRequest request, ServletResponse response, String charset) {
if (hasSetup(request)) // processed before?
return Objects.UNKNOWN;
final Locale locale = getPreferredLocale(sess, request);
response.setLocale(locale);
if (charset != null && charset.length() > 0) {
try {
if (Servlets.isServlet24()) {
response.setCharacterEncoding(charset);
} else {
// don't access 2.4 API: setCharacterEncoding, getContentType
response.setContentType(";charset=" + charset);
}
} catch (Throwable ex) {
try {
final String v = response.getCharacterEncoding();
if (!Objects.equals(v, charset))
log.warn("Unable to set response's charset: " + charset + " (current=" + v + ')', ex);
} catch (Throwable t) { // just in case
}
}
}
if (request.getCharacterEncoding() == null) {
charset = response.getCharacterEncoding();
try {
request.setCharacterEncoding(charset);
} catch (Throwable ex) {
final String v = request.getCharacterEncoding();
if (!Objects.equals(v, charset))
log.warn(
"Unable to set request's charset: "
+ charset
+ " (current="
+ v
+ "): "
+ Exceptions.getMessage(ex));
}
}
markSetup(request, true);
return Locales.setThreadLocal(locale);
}
/** Sets request encoding. */
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
if (request.getCharacterEncoding() == null) {
// set response locale according to request locale
response.setLocale(request.getLocale());
// if fmt tags specified output encoding already, use it
if (request instanceof HttpServletRequest) {
HttpSession ses = ((HttpServletRequest) request).getSession(false);
if (ses != null) {
String encoding = (String) ses.getAttribute("javax.servlet.jsp.jstl.fmt.request.charset");
if (encoding != null) {
request.setCharacterEncoding(encoding);
}
}
}
}
chain.doFilter(request, response);
}
public void setLocale(Locale locale) {
response.setLocale(locale);
}