contentfilter.java

该系统实现的是一个在线聊天的一个小应用程序

package com.berheley.filter;

import java.io.IOException;
import java.util.List;

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 赵肖强
 * 
 * 用于对发言内容的过滤
 * 
 */
public class ContentFilter implements Filter {
	// 发言不慎的默认内容
	protected String defaultContent = null;
	protected FilterConfig config = null;

	public void destroy() {
		// TODO Auto-generated method stub

	}
	/**
	 * 对发言内容中的fuck字符串进行过滤
	 */
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		if (request.getParameter("content") != null) {
			String content = request.getParameter("content").toString();
			if (content.indexOf("不务正业") != -1) {
				request.setAttribute("content", defaultContent);
			} else {
				request.setAttribute("content", content);
			}
			chain.doFilter(request, response);
		}
		else{
			chain.doFilter(request, response);
		}
	}
	/**
	 * 从web.xml中记取默认内容
	 */
	public void init(FilterConfig config) throws ServletException {
		// this.config=config;
		defaultContent = config.getInitParameter("defaultContent").toString();
	}

}