增添注释

aaa1214d · CheungChingYin · f9a3dbb5 · aaa1214d · aaa1214d · aaa1214d
9 changed file
--- a/WebContent/Contain.jsp
+++ b/WebContent/Contain.jsp
@@ -74,9 +74,9 @@
 	<body>
 		<%
 		request.setCharacterEncoding("UTF-8");
-		String pages = request.getParameter("pages");
+		String pages = request.getParameter("pages");//获取当前页数
-		int pagesNo = Integer.parseInt(pages);
+		int pagesNo = Integer.parseInt(pages);//把当前页数从字符串转为整型
-		int startLine = (Integer.parseInt(pages)-1)*10;
+		int startLine = (Integer.parseInt(pages)-1)*10;//指定数据库从哪一行开始读取
 		%>
 		<div class="contain pull-left">
 			<form action="DaoSearch.jsp" class="form-inline ">
@@ -104,11 +104,11 @@
 					</thead>
 					<tbody>
 <%
-	int pageSize = 10;
+	int pageSize = 10;//指定数据库一次读取多少行
-	String sqlQuery = "SELECT * FROM stumanagementbyweb.studentinfo limit "+startLine+","+pageSize;
+	String sqlQuery = "SELECT * FROM stumanagementbyweb.studentinfo limit "+startLine+","+pageSize;//对数据库进行伪分页读取，一次只能读10行
 	String sqlAll = "SELECT * FROM stumanagementbyweb.studentinfo";
-	int pagesCount = 0;
+	int pagesCount = 0;//用于数据库最后读出所有行后总共有多少页
-	int lastRow = 0;
+	int lastRow = 0;//记录数据库的最后一行
 	try{
 		Class.forName("com.mysql.cj.jdbc.Driver");
 		Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/stumanagementbyweb","root","123456");
@@ -117,7 +117,7 @@
 		ResultSet rs = sql.executeQuery(sqlQuery);
 		ResultSet rsAll = stat.executeQuery(sqlAll);
 		rsAll.last();
-		lastRow = rsAll.getRow();//记录最后一行
+		lastRow = rsAll.getRow();//记录数据库最后一行
 		while(rs.next()){
 			out.print("<tr>");
 			out.print("<td>"+rs.getString(1)+"</td>");
@@ -141,24 +141,24 @@
 				<div class="pageNav">
 					<ul class="pagination">
 					<%
-						int prePage;
+						int prePage;//上一页的页数
 						if(pagesNo == 1){
-							prePage = 1;
+							prePage = 1;//若当前页是第一页，则第一页只能是当前页
 						}else{
-							prePage = pagesNo - 1;
+							prePage = pagesNo - 1;//除了上述情况外上一页等于当前页-1页
 						}
 					%>
 					<li class="page-item"><a class="page-link" href="Contain.jsp?pages=<%=prePage%>">上一页</a></li>
 					<%
-						pagesCount = (lastRow % pageSize == 0) ? (lastRow / pageSize) : (lastRow / pageSize +1);
+						pagesCount = (lastRow % pageSize == 0) ? (lastRow / pageSize) : (lastRow / pageSize +1);//计算数据库能读出来的全部页数
-						int minpages = (pagesNo - 3 >0) ? (pagesNo - 3) : 1;
+						int minpages = (pagesNo - 3 >0) ? (pagesNo - 3) : 1;//设定最小页，防止页数小于第一页
-						int maxpages = (pagesNo + 3 >= pagesCount) ? (pagesCount) : (pagesNo+3);
+						int maxpages = (pagesNo + 3 >= pagesCount) ? (pagesCount) : (pagesNo+3);//设定最大页
 						for(int i = minpages;i <=maxpages ;i++){
-							if(i == pagesNo){
+							if(i == pagesNo){//当前页和遍历出来的页数相等时，需要通过调用css里面的样式“active"进行高亮
 								out.print("<li class='page-item active'>");
 								out.print("<a class='page-link' href='Contain.jsp?pages="+i+"'>"+i+"</a>");
 								out.print("</li>");
-							}else{
+							}else{//输出每一个分页
 								out.print("<li class='page-item'>");
 								out.print("<a class='page-link' href='Contain.jsp?pages="+i+"'>"+i+"</a>");
 								out.print("</li>");
@@ -172,7 +172,7 @@
 					%>
 					<%
 						int nextPage;
-						if(pagesNo == pagesCount){
+						if(pagesNo == pagesCount){//下一页的原理和上一页同理
 							nextPage = pagesCount;
 						}else{
 							nextPage = pagesNo + 1;

--- a/WebContent/DAOCheckLogin.jsp
+++ b/WebContent/DAOCheckLogin.jsp
@@ -13,7 +13,7 @@
 </head>
 <body>
 <%
+	//检验管理员的用户名密码是否正确
 	request.setCharacterEncoding("UTF-8");
 	String user = request.getParameter("user");
 	String password = request.getParameter("password");

--- a/WebContent/DaoAddStudent.jsp
+++ b/WebContent/DaoAddStudent.jsp
@@ -14,7 +14,7 @@
 <body>
 <%
+	//添加学生资料
 	if((String)session.getAttribute("user")==null){
 		out.print("<script language='JavaScript'>alert('请先登录！');window.location.href='Login.html'</script>");
 	}

--- a/WebContent/DaoAdminPasswordReset.jsp
+++ b/WebContent/DaoAdminPasswordReset.jsp
@@ -11,6 +11,7 @@
 </head>
 <body>
 <%
+	//修改管理员的密码
 	String user = session.getAttribute("user").toString();
 	String id = session.getAttribute("id").toString();
 	String passowrd = request.getParameter("pwd");
@@ -26,7 +27,7 @@
 		ps.executeUpdate();
 		ps.close();
 		con.close();
-		session.removeAttribute("user");
+		session.removeAttribute("user");//移除用户会话
 		session.removeAttribute("id");
 		out.print("<script type='text/javascript'>alert('更改密码成功!请重新登录!');window.parent.frames.location.href='Login.html';</script>");
 	}catch(Exception e){

--- a/WebContent/DaoAlertStudent.jsp
+++ b/WebContent/DaoAlertStudent.jsp
@@ -13,6 +13,7 @@
 </head>
 <body>
 <%
+	//修改学生资料
 	if((String)session.getAttribute("user")==null){
 		out.print("<script language='JavaScript'>alert('请先登录！');window.location.href='Login.html'</script>");

--- a/WebContent/DaoDelete.jsp
+++ b/WebContent/DaoDelete.jsp
@@ -12,7 +12,7 @@
 <body>
 <% 
+	//删除学生资料
 	if((String)session.getAttribute("user")==null){
 		out.print("<script language='JavaScript'>alert('请先登录！');window.location.href='Login.html'</script>");
 	}

--- a/WebContent/DaoSearch.jsp
+++ b/WebContent/DaoSearch.jsp
@@ -95,7 +95,7 @@
 					</thead>
 					<tbody>
 	<%
+	//查询功能
 	if((String)session.getAttribute("user")==null){
 		out.print("<script language='JavaScript'>alert('请先登录！');window.location.href='Login.html'</script>");
 	}

--- a/WebContent/SystemExit.jsp
+++ b/WebContent/SystemExit.jsp
@@ -13,6 +13,7 @@ if((String)session.getAttribute("user")==null){
 }
 %>
 <%
+	//用户退出登录时移除会话
 	session.removeAttribute("user");
 	session.removeAttribute("id");
 	out.print("<script type='text/javascript'>alert('用户退出成功!');window.location.href='Login.html';</script>");

--- a/WebContent/management.jsp
+++ b/WebContent/management.jsp
-<%@ page language="java" contentType="text/html; charset=UTF-8"
-    pageEncoding="UTF-8"%>
-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
-<html>
-<head>
-<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
-<title>Insert title here</title>
-</head>
-<body>
-<%
-if((String)session.getAttribute("user")==null){
-	out.print("<script language='JavaScript'>alert('请先登录！');window.location.href='Login.html'</script>");
-}
-%>
-<%=session.getAttribute("user") %>，你好，登录成功！
-</body>
-</html>
\ No newline at end of file