setcharacterencodingfilter.java

一个用ajax做的树行框架

package com.support.filter;

import java.io.IOException;
import javax.servlet.*;
/**
 * 中文编码过滤器
 * @author 郭之金
 *
 */
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 {

		// Conditionally select and set the character encoding to be used
		if (ignore || (request.getCharacterEncoding() == null)) {
			String encoding = selectEncoding(request);
			if (encoding != null)
				request.setCharacterEncoding(encoding);
		}
		response.setCharacterEncoding("text/html;charset=+encoding");

		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);

	}
}