charsetfilter.java

一个简单的java邮件系统源码

package com.easyjf.web;

import javax.servlet.*;
import java.io.IOException;

/**
 * 
 * <p>
 * Title:字符转换及过滤类
 * </p>
 * <p>
 * Description: * 字符转换，EasyJWeb主要使用utf-8格式的模板，模板中有非英文字符，请使用字符过虑功能
 * 需要在Web.xml文件中设置，设置形式如下： <filter> <filter-name>CharsetFilter</filter-name>
 * <filter-class>com.easyjf.web.CharsetFilter</filter-class> <init-param>
 * <param-name>encoding</param-name> <param-value>utf-8</param-value>
 * </init-param> <init-param> <param-name>ignore</param-name> <param-value>true</param-value>
 * </init-param> </filter> <filter-mapping> <filter-name>CharsetFilter</filter-name>
 * <servlet-name>easyjf</servlet-name> </filter-mapping>
 * <p>
 * Copyright: Copyright (c) 2006
 * </p>
 * <p>
 * Company: www.easyjf.com
 * </p>
 * 
 * @author 蔡世友
 * @version 1.0
 */

public class CharsetFilter 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 {
		if (ignore || (request.getCharacterEncoding() == null)) {
			String encoding = selectEncoding(request);
			if (encoding != null)
				request.setCharacterEncoding(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);
	}
}