indexservlet.java

简易java框架开源论坛系统源码easyjf_bbs0.1.rar

//***************************************************************
//显示首页数据的servlet
//***************************************************************
package servlet;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import conn.*;
import bean.*;
import face.*;
import java.util.List;
import java.util.Iterator;
import util.*;

public class IndexServlet extends HttpServlet
{
	public void init(ServletConfig config) throws ServletException
	{
		super.init(config);
	}

	public void service(ServletRequest request, ServletResponse respone) throws ServletException,IOException
	{
		request.setCharacterEncoding("gb2312");             //设置语言
		String pageNo = request.getParameter("pageNo");     //获取当前页数
		int current;
		//如果页数为空，就把当前页数设置为“1”
		if(pageNo == null)
		{
			current = 1;
		}
		else
		{
			current = Integer.parseInt(pageNo);
		}
		//获取一个out对象
		PrintStream out = new PrintStream(respone.getOutputStream());
		out.print("&page=" + current);                      //向flash传递当前页数
		//异常处理机制
		try
		{
			//获取一个操作数据类的对象
			FlashDbDao dd = FlashDbDao.instance(Constants.driver,
			Constants.url,Constants.username,Constants.password);
			//定义一条sql语句
			String sql = "select edition_id,edition_title,edition_content,us.user_name from bbs_edition ed,bbs_user us " +
			"where ed.user_id = us.user_id";
			dd.setPstmt(sql);
			//获取一个分页类的对象
			Pagination pager = new Pagination(dd);
			//输出总页数
			out.print("&count=" + pager.getNonce(current));
			//设置每个分页显示的条数
			pager.setPageSize(3);
			//获取一个bean
			EditionBean bb = new EditionBean();
			out.print("&page=" + current);                      //向flash传递当前页数
			out.print("&count=" + pager.getNonce(current));     //当前记录
			out.print("&pageCount=" + pager.getPageCount());	//全部页数

			List ls = pager.getPageResult(current,bb);			//获取一个包含数据bean的list
			String allId = "";
			String allTitle = "";
			String allContent = "";
			String allUser = "";
			//遍历list，把相应的数据累加在相应的字符串里，用“#”作为分割符
			for(Iterator it = ls.iterator(); it.hasNext(); )
			{
				bb = (EditionBean)it.next();
				allId += bb.getId() + "#";
				allTitle += bb.getTitle() + "#";
				allContent += bb.getContent() + "#";
				allUser += bb.getUser() + "#";
			}
			//把数据输向flash
			out.print("&allId=" + allId.substring(0, allId.length() -1));
			out.print("&allTitle=" + allTitle.substring(0, allTitle.length() -1));
			out.print("&allContent=" + allContent.substring(0, allContent.length() -1));
			out.print("&allUser=" + allUser.substring(0, allUser.length() -1));
		}
		catch (Exception e)
		{
			System.out.println("index的数据异常!");
		}
	}
}