package com.util.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;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 字符編碼過濾類,統一工程編碼，過濾規則定義在web.xml文件中。
 * 
 * @version $Revision: 1.3 $ $Date: 2007/10/31 19:53:14 $
 */

public class SetCharacterEncodingFilter implements Filter {
	/**
	 * 設置日志
	 */
	private Log log = LogFactory.getLog(SetCharacterEncodingFilter.class);

	/**
	 * 設置編碼全局變量
	 */
	private String encoding = "UTF-8";

	public void init(FilterConfig config) throws ServletException {
		log.debug("Entering EncodingFilter::init()");
		String encodeName = config.getInitParameter("Encoding");
		if (encodeName != null && encodeName.length() > 0) {
			encoding = encodeName;
		}
		log.debug("End EncodingFilter::init()");
	}

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		log.debug("Having change the encode to " + encoding);
		req.setCharacterEncoding(encoding);
		chain.doFilter(req, resp);
	}

	public void destroy() {

	}
}