學生管理系統開發程式碼分析筆記:jsp+java bean+servlet技術
1 序言
學習java web的時候很渴望有一份完整的專案給我閱讀,而網上的大部分專案拿過來都無法直接用,好不容易找到了一個學生管理系統也是漏洞百出。在此,我將邊修改邊學習這份程式碼,並且加上完全的註釋,以便日後查閱。
2 專案說明
該專案為常見的學生管理系統,系統用例就不再說明。
《待補充》
3 程式碼分析
1 登入功能
1 首頁 index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <% response.sendRedirect("user/index.jsp"); %> <%--script跳轉有的瀏覽器不識別,比如火狐,應該使用response.sendRedict()方式更為正確, 之後好多這種情況這種情況,不再一一說明 --%> </body> </html>
2 user/index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>歡迎登陸</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <link rel="stylesheet" type="text/css" href="img/css.css"> </head> <%--呼叫js進行前臺檢查,經常用到的這一段程式碼,複用率相當高 --%> <script language="JavaScript"> function login11() { if (document.form1.name.value == "" ) { alert("請輸入使用者名稱!"); document.form1.name.focus(); return false; } if (document.form1.pwd.value == "" ) { alert("請輸入密碼!"); document.form1.pwd.focus(); return false; } } </script> <STYLE> .input7 { BORDER-BOTTOM-WIDTH: 0px; WIDTH: 120px; COLOR: #000000; HEIGHT: 20px; BORDER-RIGHT-WIDTH: 0px } </STYLE> <%--本頁面為真正登陸頁面,因此會有兩種狀態,1.登陸成功跳轉到下一個頁面,2是登陸失敗重新登入,因此要接受登陸狀態引數"error" --%> <% String error = (String)request.getAttribute("error"); if(error != null && error.equals("1")){ %><script>alert('使用者名稱或密碼錯誤!')</script><% } %> <body bgcolor="#94E6FF"><%--將表單提交到servlet/user/UserLoginServlet中 --%> <form action="servlet/user/UserLoginServlet" name="form1" method="post" onSubmit="return login11()"> <div align="center"> <p>inxi </p> <p> </p> <p> </p> <table border="0" width="612" background="img/backPic1.gif" height="264" style="border: 3px double #9B9B9B"> <tr> <td colspan="2" align="center"><font face="華文隸書" size="5">研究生工程實踐管理系統<br></font><font face="華文隸書" size="3"></font></td> </tr> <tr> <td width="292" align="right">用 戶 名:</td> <td width="310"><input type="text" name="name" maxlength="16" class="input7"/></td> </tr> <tr> <td width="292" align="right">登入密碼:</td> <td width="310"><input type="password" name="pwd" maxlength="16" class="input7"/></td> </tr> <tr> <td width="292" align="right">請選擇登入身份:</td> <td width="310"> <select name= "station"> <option value="學生">研究生</option> <option value="指導老師">企業導師</option> </select> </td> </tr> <tr> <td colspan="2" align="center"><input type="submit" value="登陸"> <input type="Reset" value="重置"></td> </tr> </table> </div> </form> </body> </html>
3 UserLonginBean
這個工程中的Bean總共四個,用到的時候陸續貼出來
package bean; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.*; import util.*; public class UserLoginBean { Connection conn = null; Statement st = null; ResultSet rs = null; ArrayList al = new ArrayList();//容器的方式來接受出巡出來的結果,每個物件是查詢結果的每一列,這裡都是String物件 public int login(String name,String pwd,String station){//返回值int,代表查詢狀態,這裡也可以自定義異常處理,複用率更高 int temp = 0; conn = DBConn.getConn();//util類bean 這裡就不貼了,只有get和close的功能 try { st = conn.createStatement(); if(station.equals("學生")){//若身份為學生,則查詢學生表,若是老師查詢老師表 rs = st.executeQuery("select * from student where name='"+name+"'"); } if(station.equals("指導老師")){//老師分為指導老師和其他老師,這裡只查詢指導老師,功能待擴充 rs = st.executeQuery("select * from teacher where name='"+name+"' and station='"+station+"'"); } if(rs.next()){//若查詢到有結果,則證明有該使用者 String id = rs.getString("id"); String tname = rs.getString("name"); String tpwd = rs.getString("pwd"); String truename = rs.getString("truename"); String stations = rs.getString("station"); if(pwd.equals(tpwd)){//取出密碼欄位匹配,匹配成功取出資訊,放入容器 temp = 1;//1狀態代表查詢成功 al.add(id); al.add(tname); al.add(tpwd); al.add(stations); al.add(truename); }else{ temp = 2;//2 代表密碼不匹配 } }else{ temp = 3;//3代表沒有該使用者名稱 } } catch (SQLException e) { e.printStackTrace(); } finally{ DBConn.close(conn,st,rs);//最後關閉開啟的物件,利用bean關閉 } return temp;//返回登入狀態 } public ArrayList getArrayLst(){ return al;//返回登入查詢到的結果 } }
4 servlet/user/UserLoginServlet
至此,登陸功能已經完成,接下來是選課功能package servlet.user; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import javax.servlet.RequestDispatcher; 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 util.Validate; import bean.UserLoginBean; public class UserLoginServlet extends HttpServlet { /** * Constructor of the object. */ public UserLoginServlet() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } //由於表單是post過來的,這裡要將post轉到get public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Validate vd = new Validate();//字元轉換類,不再貼了 String name = vd.getUnicode(request.getParameter("name")); String pwd = vd.getUnicode(request.getParameter("pwd")); String station = vd.getUnicode(request.getParameter("station")); UserLoginBean lb = new UserLoginBean();//建立UserLoginBean物件,所有的使用者操作都用得上,所以封裝為Bean int flag = lb.login(name,pwd,station);//將表單傳遞過來的引數登入 ArrayList al = lb.getArrayLst();//獲取登入結果,若沒有登入成功則為null HttpSession session = request.getSession(); session.setAttribute("login", al);//建立session,將login設為登入成功的返回容器 String str = ""; if(flag == 2 || flag == 3){//2 3都代表登入失敗 str = "/user/index.jsp"; request.setAttribute("error", "1");//設定error為登入失敗狀態 }else{ if(al.get(3).equals("學生"))//若是學生返回,轉發至/user/student_list_3.jsp,老師則/user/student_list_2.jsp str = "/user/student_list_3.jsp"; else str = "/user/student_list_2.jsp"; } RequestDispatcher rd=request.getRequestDispatcher(str); rd.forward(request,response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occure */ public void init() throws ServletException { // Put your code here } }
2 選課功能
1 SelectBean
package bean; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import util.DBConn; public class SelectBean { Connection conn = null; Statement st = null; ResultSet rs = null; public ArrayList select(String sql,String[] args){ ArrayList al = new ArrayList(); conn = DBConn.getConn(); try { st = conn.createStatement(); rs = st.executeQuery(sql); while(rs.next()){ ArrayList alRow = new ArrayList(); for(int i = 0;i < args.length;i++){ alRow.add(rs.getString(args[i])); } al.add(alRow);//按語句查詢後,依次將查詢到的結果裝入容器 } } catch (SQLException e) { // TODO 自動生成 catch 塊 e.printStackTrace(); } finally{ DBConn.close(conn,st,rs); } return al;//返回查詢結果容器 } }
2 ListServlet
將需要列出來的結果都查詢出來先
package servlet; import java.io.IOException; import java.util.ArrayList; 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 util.Validate; import bean.SelectBean; public class ListServlet extends HttpServlet { /** * Constructor of the object. */ public ListServlet() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { SelectBean sb = new SelectBean(); String sql1 = "select * from teacher where station='指導老師'"; String[] args1 = {"id","name","pwd","truename","sex","age","phone","addr","station"}; ArrayList al1 = sb.select(sql1, args1); request.setAttribute("tutor", al1);//將指導老師查詢結果裝入al1 String sql2 = "select * from teacher where station='指導班主任'"; String[] args2 = {"id","name","pwd","truename","sex","age","phone","addr","station"}; ArrayList al2 = sb.select(sql2, args2); request.setAttribute("mostly", al2);//將班主任查詢結果裝入al2 String sql3 = "select * from projectbase"; String[] args3 = {"baseid","basename","contacts","baseaddress","basephone","baseemail","baseintroduction"}; ArrayList al3 = sb.select(sql3, args3); request.setAttribute("captain", al3);//將專案資訊裝入al3 String sql4 = "select * from school"; String[] args4 = {"id","name","pwd","truename","addr","station"}; ArrayList al4 = sb.select(sql4, args4); request.setAttribute("school", al4);//將學校資訊裝入al4 String sql5 = "select * from student"; String[] args5 = {"id","name","pwd","truename","sex","age","phone","addr","station"}; ArrayList al5 = sb.select(sql5, args5); request.setAttribute("student", al5);//將學生資訊裝入al5 String sql11 = "select * from project,projectbase where project.baseid = projectbase.baseid"; String[] args11 = {"projectid","projectname","basename","projectinfo","state"}; ArrayList al11 = sb.select(sql11, args11); request.setAttribute("project", al11);//關聯兩表,查詢學生申請的專案資訊,裝入al11 String sql6 = "select * from course"; String[] args6 = {"id","name","times","student"}; ArrayList al6 = sb.select(sql6, args6); request.setAttribute("course", al6);//成績資訊裝入al6 Validate vd = new Validate(); String baseid = vd.getUnicode(request.getParameter("baseid")); String sql7 = "select * from project where baseid="+baseid; String[] args7 = {"projectid","projectname","baseid","projectinfo","state"}; ArrayList al7 = sb.select(sql7, args7); request.setAttribute("studentleave", al7);//根據傳遞過來的引數,查詢學生申請情況,裝入al7 String sql12 = "select * from resource where baseid="+baseid; String[] args12 = {"resourcename","resourcenumber","resourceinfor","resourcestate","baseid","teacherid","resourceid"}; ArrayList al12 = sb.select(sql12, args12); request.setAttribute("resources", al12);//根據傳遞過來的引數,查詢與專案相關的指定專案的資源資訊,轉入al12 /* HttpSession session = request.getSession(); ArrayList adminlogin = (ArrayList)session.getAttribute("adminlogin"); if(!adminlogin.get(3).equals(1)) { ArrayList login = (ArrayList)session.getAttribute("login"); String sql12 = "select project.projectid,projectname,projectinfo,teacherproject.state from teacherproject,project,teacher where project.projectid = teacherproject.projectid and teacherproject.id=teacher.id and teacherproject.id="+login.get(0); String[] args12 = {"projectid","projectname","projectinfo","state"}; ArrayList al12 = sb.select(sql12, args12); request.setAttribute("teacherlookapply", al12); // HttpSession session = request.getSession(); ArrayList login1 = (ArrayList)session.getAttribute("login"); String sql13 = "select project.projectid,projectname,projectinfo,studentproject.state from studentproject,project,student where project.projectid = studentproject.projectid and studentproject.id=student.id and studentproject.id="+login1.get(0); String[] args13 = {"projectid","projectname","projectinfo","state"}; ArrayList al13 = sb.select(sql13, args13); request.setAttribute("studentlookapply", al13); } */ String sql8 = "select * from teacherleave"; String[] args8 = {"id","teacherid","teacher","title","content","times"}; ArrayList al8 = sb.select(sql8, args8); request.setAttribute("teacherleave", al8);//查詢老師留言,裝入al8 String sql9 = "select * from grade"; String[] args9 = {"id","studentd","coursety","gradentn"}; ArrayList al9 = sb.select(sql9, args9); request.setAttribute("grade", al9);//查詢年級資訊裝入al9 String sql10 = "select * from taste"; String[] args10 = {"id","student","title","content","times"}; ArrayList al10 = sb.select(sql10, args10); request.setAttribute("taste", al10);//查詢學生留言 } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occure */ public void init() throws ServletException { // Put your code here } }
3 SessLoginServlet
檢查session,檢查是否登陸成功
package servlet; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class SessLoginServlet extends HttpServlet { /** * Constructor of the object. */ public SessLoginServlet() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter pw = response.getWriter(); if(request.getSession().getAttribute("login") == null || request.getSession().getAttribute("login").equals("")){ pw.write("<script>alert('您還沒有登入!');window.navigate('../user/index.jsp');</script>"); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occure */ public void init() throws ServletException { // Put your code here } }
3 user/top.jsp
頁面的擡頭分離寫出來,別的頁面時用include指令包含進來
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>研究生工程實踐管理系統</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <link rel="stylesheet" type="text/css" href="img/css.css"> </head> <jsp:include flush="true" page="/servlet/SessLoginServlet"></jsp:include> <body> <div align="center"> <table style="border-style: dotted; border-width: 1px"> <tr><td width="800" height="100" style="font-family: 華文行楷; font-size: 70px; border-style: ridge; border-width: 1px; color:#332590; font-style:italic" bgcolor="#C0C0C0" align="center"> 研究生工程實踐管理系統</td></tr> <tr> <td align="center" valign="top"> <table width="100%"> <tr><td align="center" height="30" background="img/bg222.gif"> <table> <tr> <%-- <td><a href="user/course_list.jsp">課程安排|</a></td> <td><a href="user/studentleave.jsp">學生留言|</a></td> <td><a href="user/teacherleave.jsp">老師留言|</a></td> <td><a href="user/grade_list.jsp">學生成績釋出|</a></td> --%> <td><a href="user/student_list_2.jsp">工程實踐專案管理|</a></td> <%//檢查login是否登陸成功,顯示教學資源管理連結 if(request.getSession().getAttribute("login") != null && !request.getSession().getAttribute("login").equals("")){ ArrayList al = (ArrayList)session.getAttribute("login"); if(al.get(3).equals("指導老師")){ %><td><a href="user/teacher_resource.jsp">實踐教學資源管理|</a></td><% }} %> <%-- <td><a href="">實踐教學資源管理|</a></td>--%> <td><a href="servlet/UserShowServlet">個人資訊管理|</a></td> <td><a href="user/modifypwd.jsp">修改密碼|</a></td> <%-- <td><a href="servlet/CopyOfUserShowServlet">個人資訊管理|</a></td>--%> <td><a href="servlet/RemoveServlet?login=1">登出退出</a></td> </tr> </table> </td></tr> </table> </td> </tr> </table> </div> </body> </html>
4 StudentSelectServlet
package servlet.user; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import bean.SelectBean; import util.Validate; public class StudentSelectServlet_1 extends HttpServlet { /** * Constructor of the object. */ public StudentSelectServlet_1() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Validate vd = new Validate(); String projectname = vd.getUnicode(request.getParameter("projectname_1")); SelectBean sb = new SelectBean(); String sql = "select * from project,projectbase "; String[] args = {"projectid","projectname","basename","projectinfo","state"}; sql += "where project.baseid = projectbase.baseid and projectname like '%"+projectname+"%'"; ArrayList al = sb.select(sql, args); request.setAttribute("students", al); RequestDispatcher rd=request.getRequestDispatcher("/user/student_list_3.jsp"); rd.forward(request,response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occure */ public void init() throws ServletException { // Put your code here } }
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