com.liusoft.dlog4j.action.TrackBackAction.java Source code

Introduction

Here is the source code for com.liusoft.dlog4j.action.TrackBackAction.java

Source

/*
 *  TrackBackAction.java
 *  
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Library General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *  
 *  Author: Winter Lau
 *  http://dlog4j.sourceforge.net
 *  
 */
package com.liusoft.dlog4j.action;

import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.liusoft.dlog4j.beans.TrackBackBean;
import com.liusoft.dlog4j.dao.TrackBackDAO;
import com.liusoft.dlog4j.formbean.TrackBackForm;

/**
 * ?Trackback
 * @author Winter Lau
 */
public class TrackBackAction extends Action {

    /**
     * 
     */
    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest req,
            HttpServletResponse res) throws Exception {
        TrackBackForm tbf = (TrackBackForm) form;
        String msg = validate(tbf);
        if (msg == null) {
            try {
                TrackBackBean tbb = new TrackBackBean();
                tbb.setBlogName(tbf.getBlog_name());
                tbb.setExcerpt(tbf.getExcerpt());
                tbb.setParentId(tbf.getId());
                tbb.setParentType(tbf.getType());
                tbb.setRemoteAddr(req.getRemoteAddr());
                tbb.setTitle(tbf.getTitle());
                tbb.setTrackTime(new Date());
                tbb.setUrl(tbf.getUrl());
                TrackBackDAO.create(tbb);
            } catch (Exception e) {
                getServlet().log("TrackBackAction.execute failed.", e);
                msg = e.getMessage();
            }
        }
        String xml = getResponse(msg != null, msg);
        res.getWriter().print(xml);
        return null;
    }

    /**
     * ?
     */
    protected String validate(TrackBackForm form) {
        if (StringUtils.isEmpty(form.getUrl()))
            return "url is empty";
        else if (form.getId() < 0)
            return "Illegal value of object id";
        else if (StringUtils.isEmpty(form.getBlog_name()))
            return "Blog_name is empty";
        else if (StringUtils.isEmpty(form.getTitle()))
            return "Title is empty";
        return null;
    }

    /**
     * TrackBack???
     * @param error
     * @param msg
     * @return
     */
    protected String getResponse(boolean error, String msg) {
        StringBuffer xml = new StringBuffer();
        xml.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
        xml.append("<response>");
        if (error) {
            xml.append("<error>1</error>");
            xml.append("<message>");
            xml.append(msg);
            xml.append("</message>");
        } else
            xml.append("<error>0</error>");
        xml.append("</response>");
        return xml.toString();
    }
}