package com.eksera.service;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;
public class CharacterEncodingFilter implements Filter {
    private Logger logger = Logger.getLogger(CharacterEncodingFilter.class.getName());
    public static final String REQUEST_CHARACTER_ENCODING = "characterEncoding";
    private String encoding = null;
    public void init(FilterConfig filterConfig) throws ServletException {
        encoding = filterConfig.getInitParameter(REQUEST_CHARACTER_ENCODING);
        if (logger.isDebugEnabled()) logger.debug("encoding=" + encoding);
    }
    private String getInitParameter(FilterConfig filterConfig, String parameterName) throws ServletException {
        String value = filterConfig.getInitParameter(parameterName);
        if (StringUtils.isEmpty(value)) {
            throw new ServletException(getClass().getName() + ": " + parameterName + " is required");
        }        
        return value;
    }
    public void doFilter(ServletRequest request,
                         ServletResponse response,
                         FilterChain chain) throws IOException, ServletException
    {        
        request.setCharacterEncoding(encoding);        
        chain.doFilter(request, response);
    }
    public void destroy() { }
}

<filter>
		<filter-name>CharacterEncodingFilter</filter-name>
		<filter-class>com.eksera.service.CharacterEncodingFilter</filter-class>
	<init-param>
      <param-name>characterEncoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
	</filter>
	<filter-mapping>
		<filter-name>CharacterEncodingFilter</filter-name>
		<url-pattern>*.jsp</url-pattern>
	</filter-mapping>
	
	<filter-mapping>
		<filter-name>CharacterEncodingFilter</filter-name>
		<url-pattern>*.do</url-pattern>
	</filter-mapping>
	<filter-mapping>
		<filter-name>CharacterEncodingFilter</filter-name>
		<url-pattern>/servlet/*</url-pattern>
	</filter-mapping>