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package samples.i18n.simple.servlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* Simple filter to set the character encoding to be used to parse the request.
* The character encoding we use here is defined as initialization parameter
*/
public class SimpleFilter implements Filter {
private FilterConfig filterConfig = null;
private boolean usefilter = false;
private String encoding = null;
/**
* Called by the web container to indicate to a filter that it is being placed into service
*
* @param filterConfig The filter configuration object
*/
public void init(FilterConfig filterConfig) throws ServletException {
try {
this.filterConfig = filterConfig;
String param = filterConfig.getInitParameter("usefilter");
this.encoding = filterConfig.getInitParameter("encoding");
if (param.equals("true")) {
this.usefilter = true;
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* The doFilter method of the Filter is called by the container each time a request/response pair
* is passed through the chain due to a client request for a resource at the end of the chain.
* @param request The servlet request upon which the filter is acting
* @param result The servlet response that we are creating from the filter
* @param chain The filter chain we are processing
*/
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
try {
if (usefilter) {
String encoding = getEncoding(req);
if (encoding != null) {
req.setCharacterEncoding(encoding);
}
}
chain.doFilter(req, res);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Gets the encoding from initialization parameter and sets it to this filter
*
* @param request The servlet request
*/
protected String getEncoding(ServletRequest req) {
return this.encoding;
}
/**
* Called by the web container to indicate to a filter that it is being taken out of service.
*/
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
}