java фильтр для сервлета

java-Фильтр для сервлета

http://www.skipy.ru/technics/encodings_webapp.html

[code:]java[:code]
import java.io.*;
import javax.servlet.*;

/**
 * FormEncodingSetterFilter
 *
 * @author Eugene Matyushkin
 */
public class FormEncodingSetterFilter implements Filter{

    private static final String FILTERABLE_CONTENT_TYPE="application/x-www-form-urlencoded";

    private static final String ENCODING_DEFAULT = "UTF-8";

    private static final String ENCODING_INIT_PARAM_NAME = "encoding";

    private String encoding;

    public void destroy(){
    }

    public void doFilter(ServletRequest req, ServletResponse resp,
                         FilterChain chain) throws ServletException, IOException{
        String contentType = req.getContentType();
        if (contentType != null && contentType.startsWith(FILTERABLE_CONTENT_TYPE))
            req.setCharacterEncoding(encoding);
        chain.doFilter(req, resp);
    }

    public void init(FilterConfig config) throws ServletException{
        encoding = config.getInitParameter(ENCODING_INIT_PARAM_NAME);
        if (encoding == null)
            encoding = ENCODING_DEFAULT;
    }
}
[/code]
[code:]xml[:code]
<filter>
    <filter-name>FormEncodingSetterFilter</filter-name>
    <filter-class>ru.skipy.juga_ru.web.i18n_tutorial.FormEncodingSetterFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>FormEncodingSetterFilter</filter-name>
    <url-pattern>/i18n-tutorial/*</url-pattern>
</filter-mapping>
[/code]