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Java code:

package com.researchDeclare.charsetfilter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class CharSetClass implements Filter
{
protected String encoding = null;
protected FilterConfig filterConfig = null;

public CharSetClass()
{
super();
}

public void destroy()
{
// TODO Auto-generated method stub
this.encoding = null;
this.filterConfig = null;
}

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterChain) throws IOException, ServletException
{
// TODO Auto-generated method stub
if (request.getCharacterEncoding() == null)
{
String encoding = selectEncoding(request);
if (encoding != null)
{
request.setCharacterEncoding(encoding);
response.setCharacterEncoding(encoding);
}
}
filterChain.doFilter(request, response);
}

private Str