src/com/servlet/tongji_servlet.java

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package com.servlet;
import java.io.IOException;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.RequestDispatcher;
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;

import com.dao.DB;
import com.orm.Txuesheng;
import com.util.utilService;


public class tongji_servlet extends HttpServlet
{
	public void service(HttpServletRequest req,HttpServletResponse res)throws ServletException, IOException 
	{
        String type=req.getParameter("type");
		
		if(type.endsWith("tongji"))
		{
			tongji(req, res);
		}
	}
	
	
	public void tongji(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{
		List xueshengList=utilService.get_xuesheng_list();
		for(int i=0;i<xueshengList.size();i++)
		{
			Txuesheng xuesheng=(Txuesheng)xueshengList.get(i);
			
			int fenshu_all=utilService.fenshu_all(xuesheng.getId());
			xuesheng.setFenshu_all(fenshu_all);
			
		}
		
		req.setAttribute("xueshengList", xueshengList);
		req.getRequestDispatcher("admin/tongji/tongji.jsp").forward(req, res);
	}
	
	
	public void dispatch(String targetURI,HttpServletRequest request,HttpServletResponse response) 
	{
		RequestDispatcher dispatch = getServletContext().getRequestDispatcher(targetURI);
		try 
		{
		    dispatch.forward(request, response);
		    return;
		} 
		catch (ServletException e) 
		{
                    e.printStackTrace();