SetCharacterEncodingFilter.java

package nl.ibanx.web.filter;

import java.io.IOException;
import javax.servlet.*;

/**
 * Set the character encoding of the request to UTF-8. 
 */
public class SetCharacterEncodingFilter implements Filter {

    public static final String UTF8_ENCODING = "UTF-8";
    private String encoding;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        encoding = filterConfig.getInitParameter("encoding");
        if(encoding == null) {
            encoding = UTF8_ENCODING;
        }
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        if(request.getCharacterEncoding() == null) {
            request.setCharacterEncoding(encoding);
        }
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
        // nothing to destroy here
    }

}