setcharacterencodingfilter.java

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package com.nitpro.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;

/**
 * 
 * @author 邓锦溏
 * @version 1.0
 * 该类主要用来处理中文编码问题
 */
public class SetCharacterEncodingFilter implements Filter {

	protected String encoding = null;

	protected FilterConfig filterConfig = null;

	protected boolean ignore = true;

	/**
	 * Method execute
	 * 初始化过滤器类，从配置文件中得到encoding
	 * @param filterConfig
	 * @return encoding
	 */
	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
			this.ignore = false;
	}

	/**
	 * Method execute
	 * 销毁过滤器类，
	 * @return filterConfig
	 * @return encoding
	 */
	public void destroy() {
		this.encoding = null;
		this.filterConfig = null;
	}

	/**
	 * Method execute
	 * 进行过滤器处理
	 * @return filterConfig
	 * @return encoding
	 */
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {

		request.setCharacterEncoding("GBK");
		response.setCharacterEncoding("GBK");
		response.setCharacterEncoding("html/text,charset=gbk");
	
		if (ignore || (request.getCharacterEncoding() == null)) {
			String encoding = selectEncoding(request);
			if (encoding != null)
				request.setCharacterEncoding(encoding);
		}

		chain.doFilter(request, response);

	}

	protected String selectEncoding(ServletRequest request) {
		return (this.encoding);
	}

}