bbsfilter.java

tbuy1.1.5是在netbeans环境下用JSF技术编写的一个论坛tbuy1.1.5是在netbeans环境下用JSF技术编写的一个论坛

/*
 * 作者: 胡李青
 * qq: 31703299
 * Copyright (c) 2007 huliqing
 * 主页 http://www.tbuy.biz/
 * 你可以免费使用该软件，未经许可请勿作用于任何商业目的,如有技术问题请与本人联系！
 *
 * 该类主要用于BBS访问转发,如
 * /bbs/zone/x.jsp -> /bbs/zone.jsp
 * /bbs/forum/x.jsp -> /bbs/forum/x.jsp
 * /bbs/topic/x.jsp -> /bbs/topic.jsp
 */

package biz.tbuy.bbs;

import biz.tbuy.bbs.bean.BaseBean;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
/**
 * @author huliqing
 * <p><b>qq：</b>31703299
 * <p><b>E-mail：</b>
 * <a href="mailto:[e-mail]">[e-mail]</a>
 * <p><b>Homepage：</b>
 * <a href="http://www.tbuy.biz/">http://www.tbuy.biz/</a>
 */
public class BBSFilter extends BaseBean implements Filter{
    private FilterConfig filterConfig = null;
    private boolean inZone;     /* 标识当前所在页面是否为 /bbs/zone.jsp    */
    private boolean inForum;    /* 标识当前所在页面是否为 /bbs/forum.jsp   */
    private boolean inTopic;    /* 标识当前所在页面是否为 /bbs/topic.jsp   */

    public BBSFilter() {
    }

    public void doFilter(ServletRequest request, 
            ServletResponse response, FilterChain chain) throws IOException, ServletException {
        
        HttpServletRequest requestHttp = (HttpServletRequest) request;
        String requestURI = requestHttp.getRequestURI();
        RequestDispatcher requestDispatcher;
        // System.out.println("BBSFilter.requestURI=" + requestURI);
        // 分析URI
        this.parseURI(requestURI);
        
        if (inZone) {
            requestDispatcher = 
                    request.getRequestDispatcher("/bbs/zone.jsp");
            requestDispatcher.forward(request, response);
        } else if (inForum) {
            requestDispatcher = 
                    request.getRequestDispatcher("/bbs/forum.jsp");
            requestDispatcher.forward(request, response);
        } else if (inTopic) {
            requestDispatcher = 
                    request.getRequestDispatcher("/bbs/topic.jsp");
            requestDispatcher.forward(request, response);
        } else {
             try {
                chain.doFilter(request, response);
            } catch(Throwable t) {}
        }
    }
    
    private void initParam() {
        this.inZone = false;
        this.inForum = false;
        this.inTopic = false;
    }
    
    /**
     * 分析当前请求的URL是否于哪一个页面中
     */ 
    private void parseURI(String uri) {
        // System.out.println("uri=" + uri);
        this.initParam();   // 重新初始化数参数
        if (uri.indexOf("/bbs/zone/") != -1) {
            this.inZone = true;
        } else if (uri.indexOf("/bbs/forum/") != -1) {
            this.inForum = true;
        } else if (uri.indexOf("/bbs/topic/") != -1) {
            this.inTopic = true;
        }
    }

    /**
     * Return the filter configuration object for this filter.
     * @return filterConfig
     */
    public FilterConfig getFilterConfig() {
        return (this.filterConfig);
    }
    
    /**
     * Set the filter configuration object for this filter.
     * @param filterConfig The filter configuration object
     */
    public void setFilterConfig(FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
    }
    
    /**
     * Destroy method for this filter
     */
    public void destroy() {
    }
    
    /**
     * Init method for this filter
     * @param filterConfig
     */
    public void init(FilterConfig filterConfig) { 
        this.filterConfig = filterConfig;
    }
}