showfeedbackaction.java

用java开发的blog

package cn.com.blogonline;

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

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


public class ShowFeedbackAction extends HttpServlet {
    
	public void init(ServletConfig config) throws ServletException {
    }
    
    /*
     *  处理<GET> 请求方法.
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    	//设置接收信息的字符集
    	request.setCharacterEncoding("UTF-8");
    	//接收浏览器端提交的信息
		String articleId = request.getParameter("articleid");
		String pageId = request.getParameter("pageid");

	    /*
	     * 文章编号处理
	     */
		HttpSession session = request.getSession(true);
		DbOperate	db=new DbOperate();
		int iArticleId = 0;
		Article article = null;
		if (articleId!=null) {
			iArticleId = Integer.parseInt(articleId);
			article=db.getArticle(iArticleId);
			session.setAttribute(Constants.CUR_ARTICLE_KEY,article);
		}
		else{
			article=(Article)session.getAttribute(Constants.CUR_ARTICLE_KEY);
			iArticleId = article.getId();
		}
		
		/*
		 * 页号处理
		 */
		int iPageId = 0;
		int pageCount = 0;
		
		List feedBackList=db.getFeedBacks(iArticleId);
		if (pageId!=null) {
			iPageId = Integer.parseInt(pageId);
			if (iPageId<0) iPageId = 0;
		    /*
		     * 获取总页数
		     */
		    if (feedBackList.size()%Constants.ARTICLE_PAGE_SIZE ==0){
				pageCount=feedBackList.size() / Constants.ARTICLE_PAGE_SIZE;
			}
		    else{
		    	pageCount=feedBackList.size() / Constants.ARTICLE_PAGE_SIZE+1;
		    }
			if (iPageId>=pageCount) iPageId = pageCount-1;
			session.setAttribute(Constants.CUR_PAGEID_KEY,new Integer(iPageId));
		}
		else {
			Integer temp = (Integer)session.getAttribute(Constants.CUR_PAGEID_KEY);
			iPageId = temp.intValue();
		}
		
	    /*
	     * 分页显示
	     */
    	List  dispList=new ArrayList();
	    if ((feedBackList.size()>iPageId * Constants.ARTICLE_PAGE_SIZE )&&(iPageId>=0)){
	    	for (int i=iPageId*Constants.ARTICLE_PAGE_SIZE;i<(iPageId+1)*Constants.ARTICLE_PAGE_SIZE;i++){
				if (i<feedBackList.size()){
					dispList.add(feedBackList.get(i));
				}
	    	}
	    }
		session.setAttribute(Constants.FEEDBACK_LIST_KEY,dispList);
	    response.sendRedirect("/BlogOnline/feedback.jsp");
    }
}