blogoperateaction.java

ajax+jsp打造的Blog源码,运行环境：eclipse+tomcat5.5

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 BlogOperateAction 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 blogId = request.getParameter("blogid");
		String sortId = request.getParameter("sortid");
		String pageId = request.getParameter("pageid");

		HttpSession session = request.getSession(true);
		int iBlogId = 0;
		DbOperate	db=new DbOperate();
		if (blogId!=null) {
			iBlogId = Integer.parseInt(blogId);
			Blog blog = db.getBlog(iBlogId);
			session.setAttribute(Constants.VISIT_BLOG_KEY,blog);
		}
		else {
			Blog blog = (Blog)session.getAttribute(Constants.VISIT_BLOG_KEY);
			iBlogId = blog.getId();
		}
		
		int iSortId = 0;
		if (sortId!=null) {
			iSortId = Integer.parseInt(sortId);
			session.setAttribute(Constants.CUR_SORTID_KEY,new Integer(iSortId));
		}
		else{
			Integer temp = (Integer)session.getAttribute(Constants.CUR_SORTID_KEY);
			iSortId = temp.intValue();
		}

		/*
		 * 页号处理
		 */
		int iPageId = 0;
		int pageCount = 0;
		List articleList=db.getBlogArticles(iBlogId,iSortId);
		if (pageId!=null) {
			iPageId = Integer.parseInt(pageId);
			if (iPageId<0) iPageId = 0;
		    /*
		     * 获取总页数
		     */
		    if (articleList.size()%Constants.ARTICLE_PAGE_SIZE ==0){
				pageCount=articleList.size() / Constants.ARTICLE_PAGE_SIZE;
			}
		    else{
		    	pageCount=articleList.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 ((articleList.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<articleList.size()){
					dispList.add(articleList.get(i));
				}
	    	}
	    }
		session.setAttribute(Constants.ARTICLE_LIST_KEY,dispList);
	    response.sendRedirect("/BlogOnline/main.jsp");
        
    }
}