做个简单的Java学生考勤系统07--完善学生相关功能

Posted 2021-11-25 exodus3

前几篇，我们做出了学生显示，查询学生信息的功能，接下来是对学生方面功能的增强。

1、列出所有学生的方法

package servlet;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
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 org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import util.DB;

import model.TAdmin;
import model.Tkecheng;
import model.Tlaoshi;
import model.Txuesheng;

public class xuesheng_servlet extends HttpServlet
{
	public void service(HttpServletRequest req,HttpServletResponse res)throws ServletException, IOException 
	{
        String type=req.getParameter("type");
		
		if(type.endsWith("xueshengAdd"))
		{
			xueshengAdd(req, res);
		}
		if(type.endsWith("xueshengMana"))
		{
			xueshengMana(req, res);
		}
		if(type.endsWith("xueshengDel"))
		{
			xueshengDel(req, res);
		}
		
		if(type.endsWith("daoru"))
		{
			daoru(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();
		} 
		catch (IOException e) 
		{
			
		    e.printStackTrace();
		}
	}
	public void init(ServletConfig config) throws ServletException 
	{
		super.init(config);
	}
	
	public void destroy() 
	{
		
	}
}

方法讲解：该方法有管理学生，删除学生，用Excel导入学生信息等方法

2、管理学生信息

public void xueshengMana(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
{
	List xueshengList=new ArrayList();
	String sql="select * from t_xuesheng where del='no'";
	Object[] params={};
	DB mydb=new DB();
	try
	{
		mydb.doPstm(sql, params);
		ResultSet rs=mydb.getRs();
		while(rs.next())
		{
			Txuesheng xuesheng=new Txuesheng();
			
			xuesheng.setId(rs.getInt("id"));
			xuesheng.setXuehao(rs.getString("xuehao"));
			xuesheng.setXingming(rs.getString("xingming"));
			xuesheng.setXingbie(rs.getString("xingbie"));
			
			xuesheng.setNianling(rs.getString("nianling"));
			xuesheng.setBanji(rs.getString("banji"));
			xuesheng.setLoginname(rs.getString("loginname"));
			xuesheng.setLoginpw(rs.getString("loginpw"));
			xuesheng.setDel(rs.getString("del"));
			
			xueshengList.add(xuesheng);
	    }
		rs.close();
	}
	catch(Exception e)
	{
		e.printStackTrace();
	}
	mydb.closed();
	
	req.setAttribute("xueshengList", xueshengList);
	req.getRequestDispatcher("admin/xuesheng/xueshengMana.jsp").forward(req, res);
}

方法讲解：进入管理学生的界面

3、添加学生方法

public void xueshengAdd(HttpServletRequest req,HttpServletResponse res)
{
	String xuehao=req.getParameter("xuehao");
	String xingming=req.getParameter("xingming");
	String xingbie=req.getParameter("xingbie");
	String nianling=req.getParameter("nianling");
	
	String banji=req.getParameter("banji");
	String loginname=req.getParameter("loginname");
	String loginpw=req.getParameter("loginpw");
	String del="no";
	
	String sql="insert into t_xuesheng values(?,?,?,?,?,?,?,?)";
	Object[] params={xuehao,xingming,xingbie,nianling,banji,loginname,loginpw,del};
	DB mydb=new DB();
	mydb.doPstm(sql, params);
	mydb.closed();
	
	req.setAttribute("message", "操作成功");
	req.setAttribute("path", "xuesheng?type=xueshengMana");
	
       String targetURL = "/common/success.jsp";
	dispatch(targetURL, req, res);
}

方法讲解：增加学生信息，跳转到成功页面

4、删除学生

public void xueshengDel(HttpServletRequest req,HttpServletResponse res)
{
	
	String sql="update t_xuesheng set del='yes' where id="+Integer.parseInt(req.getParameter("id"));
	Object[] params={};
	DB mydb=new DB();
	mydb.doPstm(sql, params);
	mydb.closed();
	
	req.setAttribute("message", "操作成功");
	req.setAttribute("path", "xuesheng?type=xueshengMana");
	
       String targetURL = "/common/success.jsp";
	dispatch(targetURL, req, res);
}

方法讲解：删除学生信息，跳转到成功页面

5、导入学生信息

public void daoru(HttpServletRequest req,HttpServletResponse res) throws IOException
{
	
	String fujianXingming=req.getParameter("fujianXingming");
	String lujing = req.getSession().getServletContext().getRealPath("upload")+"/"+fujianXingming;
	
	FileInputStream fin=new FileInputStream(lujing);
    HSSFWorkbook workbook=new HSSFWorkbook(fin);//创建工作薄
    HSSFSheet sheet=workbook.getSheetAt(0);//得到工作表
    HSSFRow row=null;//对应excel的行
    HSSFCell cell=null;//对应excel的列
   
    int totalRow=sheet.getLastRowNum();//得到excel的总记录条数
    for(int i=1;i<=totalRow;i++)
    {
        row=sheet.getRow(i);
        
        cell=row.getCell(0);
        String xuehao=cell.getRichStringCellValue().toString();
        
        cell=row.getCell(1);
        String xingming=cell.getRichStringCellValue().toString();
        
        cell=row.getCell(2);
        String xingbie=cell.getRichStringCellValue().getString();
        
        cell=row.getCell(3);
        String nianling=cell.getRichStringCellValue().toString();
        
        cell=row.getCell(4);
        String banji=cell.getRichStringCellValue().toString();
        
        cell=row.getCell(5);
        String loginname=cell.getRichStringCellValue().toString();
        
        cell=row.getCell(6);
        String loginpw=cell.getRichStringCellValue().toString();
        
        String del="no";
		
		String sql="insert into t_xuesheng values(?,?,?,?,?,?,?,?)";
		Object[] params={xuehao,xingming,xingbie,nianling,banji,loginname,loginpw,del};
		DB mydb=new DB();
		mydb.doPstm(sql, params);
		mydb.closed();
   }
    
    req.setAttribute("message", "操作成功");
	req.setAttribute("path", "xuesheng?type=xueshengMana");
	
       String targetURL = "/common/success.jsp";
	dispatch(targetURL, req, res);
	
}

方法讲解：该功能是从Excel导入学生到系统里，然后保存数据到数据库，值得注意的是，Excel里面的列要对齐，要统一，比如第一列是学号，第二列是姓名，第三列是性别等等，顺序不能乱