encodingfilter.java

sample struct article, ... ...

/**
 * Copyright (C) 2003-2006 TiandiNet.com
 * 
 * Struts 文章系统 1.1
 * 
 * release-date: 2006-02-25
 */

package com.tiandinet.StrutsArticle.FunctionBeans;

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 javax.servlet.http.HttpServletResponse;

/**
 * @author Meng Yang
 * @version 1.1
 */
public class EncodingFilter implements Filter {
	
	private String targetEncodin = "UTF-8";
	protected FilterConfig filterConfig;

	/**
	 * 
	 */
	public EncodingFilter() {
		super();
		// TODO Auto-generated constructor stub
	}

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
	 */
	public void init(FilterConfig config) throws ServletException {
		// TODO Auto-generated method stub
		this.filterConfig = config;
		if (config.getInitParameter("encoding") != null 
				&& !config.getInitParameter("encoding").equals("")) {
			this.targetEncodin = config.getInitParameter("encoding");
		}
	}

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
	 */
	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		
		servletRequest.setCharacterEncoding(this.targetEncodin);
		
		servletResponse.setContentType("text/html; charset=" + this.targetEncodin);
		
		HttpServletResponse httpServletResponse = (HttpServletResponse)servletResponse;
		httpServletResponse.setHeader("Pragma", "No-cache");
		httpServletResponse.setHeader("Cache-Control", "no-cache");
		httpServletResponse.setHeader("Expires", "0");
		
		chain.doFilter(servletRequest, servletResponse);
	}

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
		
		this.filterConfig = null;
	}

}