基于Java的学生管理系统的设计与实现【附源码】

package util; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.GregorianCalendar; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Random; import java.util.Set; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import dao.CommDAO; import jxl.Workbook; import jxl.write.Label; import jxl.write.WritableSheet; import jxl.write.WritableWorkbook; import jxl.write.WriteException; import jxl.write.biff.RowsExceededException; public class Info { //public static String popheight = "alliframe.height=document.body.clientHeight+"; public static String popheight = "alliframe.style.height=document.body.scrollHeight+"; public static HashMap getUser(HttpServletRequest request) { HashMap map = (HashMap)(request.getSession().getAttribute("username")==null?request.getSession().getAttribute("user"):request.getSession().getAttribute("username")); return map; } public static int getBetweenDayNumber(String dateA, String dateB) { long dayNumber = 0; //1小时=60分钟=3600秒=3600000 long mins = 60L * 1000L; //long day= 24L * 60L * 60L * 1000L;计算天数之差 SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm"); try { java.util.Date d1 = df.parse(dateA); java.util.Date d2 = df.parse(dateB); dayNumber = (d2.getTime() - d1.getTime()) / mins; } catch (Exception e) { e.printStackTrace(); } return (int) dayNumber; } public static void main(String[] g ) { System.out.print(Info.getBetweenDayNumber("2012-11-11 11:19", "2012-11-11 11:11")); } public static String getselect(String name,String tablename,String zdname) { String select = "<select name=\""+name+"\" id=\""+name+"\" >"; for(HashMap permap:new CommDAO().select("select * from "+tablename+" order by id desc")){ select+="<option value=\""+permap.get(zdname)+"\">"+permap.get(zdname)+"</option>"; } select+="</select>"; return select; } public static String getselectsl(String name,String tablename,String zdname) { String select = "<select name=\""+name+"\" id=\""+name+"\" onchange='gow();'>"; select+="<option value=''>请选择</option>"; for(HashMap permap:new CommDAO().select("select * from "+tablename+" order by id desc")){ select+="<option value=\""+permap.get(zdname)+"\">"+permap.get(zdname)+"</option>"; } select+="</select>"; return select; } public static String getselect(String name,String tablename,String zdname,String where) { String select = "<select name=\""+name+"\" id=\""+name+"\" >"; select+="<option value=\"\">不限</option>"; for(HashMap permap:new CommDAO().select("select * from "+tablename+" where "+where+" order by id desc")){ String optionstr = ""; if(zdname.split(";").length==1){ optionstr=permap.get(zdname.split("~")[0]).toString(); }else{ for(String str:zdname.split(";")) { String zdstr = str.split("~")[0]; String zdnamestr = str.split("~")[1].equals("无名")?"":(str.split("~")[1]+":"); optionstr+=zdnamestr+permap.get(zdstr)+" - "; } } if(optionstr.indexOf(" - ")>-1)optionstr=optionstr.substring(0,optionstr.length()-3); select+="<option value=\""+optionstr+"\">"+optionstr+"</option>"; } select+="</select>"; return select; } public static String getradio(String name,String tablename,String zdname,String where) { String radio=""; int dxii = 0; for(HashMap permap:new CommDAO().select("select * from "+tablename+" where "+where+" order by id desc")){ String check=""; if(dxii==0)check="checked=checked"; String optionstr = ""; for(String str:zdname.split(";")) { String zdstr = str.split("~")[0]; String zdnamestr = str.split("~")[1].equals("无名")?"":(str.split("~")[1]+":"); optionstr+=zdnamestr+permap.get(zdstr)+" - "; } if(optionstr.length()>0)optionstr=optionstr.substring(0,optionstr.length()-3); radio+="<label><input type='radio' name='"+name+"' "+check+" value=\""+optionstr+"\">"+optionstr+"</label>\n"; dxii++; } return radio; } public static void writeExcel(String fileName,String prosstr,java.util.List<List> plist,HttpServletRequest request, HttpServletResponse response){ WritableWorkbook wwb = null; String cols = ""; for(String str:prosstr.split("@")) { cols+=str.split("-")[0]+","; } cols = cols.substring(0,cols.length()-1); String where = request.getAttribute("where")==null?"":request.getAttribute("where").toString(); List<List> mlist = new CommDAO().selectforlist("select "+cols+" from "+fileName+" "+where+" order by id desc"); fileName = request.getRealPath("/")+"/upfile/"+Info.generalFileName("a.xls"); String[] pros = prosstr.split("@"); try { //首先要使用Workbook类的工厂方法创建一个可写入的工作薄(Workbook)对象 wwb = Workbook.createWorkbook(new File(fileName)); } catch (IOException e) { e.printStackTrace(); } if(wwb!=null){ //创建一个可写入的工作表 //Workbook的createSheet方法有两个参数，第一个是工作表的名称，第二个是工作表在工作薄中的位置 WritableSheet ws = wwb.createSheet("sheet1", 0); ws.setColumnView(0,20); ws.setColumnView(1,20); ws.setColumnView(2,20); ws.setColumnView(3,20); ws.setColumnView(4,20); ws.setColumnView(5,20); try { for(int i=0;i<pros.length;i++) { Label label1 = new Label(i, 0,""); label1.setString(pros[i]); ws.addCell(label1); } } catch (RowsExceededException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (WriteException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } //下面开始添加单元格 int i=1; for(List t:mlist){ try { Iterator it = t.iterator(); int jj=0; while(it.hasNext()) { Label label1 = new Label(jj, i,""); String a = it.next().toString(); label1.setString(a); ws.addCell(label1); jj++; } i++; } catch (RowsExceededException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (WriteException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } try { //从内存中写入文件中 wwb.write(); //关闭资源，释放内存 wwb.close(); } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } try { response.sendRedirect("upload?filename="+fileName.substring(fi