setcharacterencodingfilter.java

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package com.filter;
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 SetCharacterEncodingFilter implements Filter {
	
    protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;
    
    public void destroy() {
        this.encoding = null;
        this.filterConfig = null;
    }
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain chain)
	throws IOException, ServletException {
        if (ignore || (request.getCharacterEncoding() == null)) {
            String encoding = selectEncoding(request);
            if (encoding != null){
                request.setCharacterEncoding(encoding);
                System.out.println("====================================filter character=============================");
            }
        }
        chain.doFilter(request, response);
    }
    public void init(FilterConfig filterConfig) throws ServletException {
	this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
        String value = filterConfig.getInitParameter("ignore");
        if (value == null)
            this.ignore = true;
        else if (value.equalsIgnoreCase("true"))
            this.ignore = true;
        else if (value.equalsIgnoreCase("yes"))
            this.ignore = true;
        else
            this.ignore = false;
    }
    protected String selectEncoding(ServletRequest request) {
        return (this.encoding);
    }


}