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 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;

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {

		// TODO 自动生成方法存根

		if (ignore || (request.getCharacterEncoding() == null)) {

			String encoding = selectEncoding(request);

			if (encoding != null)

				request.setCharacterEncoding(encoding);

		}

		chain.doFilter(request, response);

	}

	public void destroy() {

		// TODO 自动生成方法存根

		this.encoding = null;

		this.filterConfig = null;

	}

	protected String selectEncoding(ServletRequest request) {

		return (this.encoding);

	}

}