6月12日学习日志
今天完成了web实验三-数据库程序设计。
index.jsp文件代码
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%> <%@ page errorPage="error.jsp"%> <html> <head> <title>学生管理系统</title> <link rel="stylesheet" type="text/css" href="css/style.css"> </head> <body> <h1>学生管理系统</h1> <a href="add.jsp">添加学生信息</a> <br /> <br /> <table style="width: 50%;"> <tr> <th>学号</th> <th>姓名</th> <th>性别</th> <th>出生年月</th> <th>住址</th> <th>操作</th> </tr> <% try { Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf-8", "root", "123456"); //使用Statement对象 Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery("select * from studentinfo"); /* PreparedStatement stmt = con.prepareStatement("select * from student"); ResultSet rs = stmt.executeQuery(); */ while (rs.next()) { int id = rs.getInt(1); out.println("<tr><td>" + rs.getString(1) + "</td><td>" + rs.getString(2) + "</td><td>" + rs.getString(3)+ "</td><td>" + rs.getString(4)+"</td><td>" + rs.getString(5) +"</td><td><a href='edit.jsp?id=" + id + "'>修改</a> <a href='del.jsp?id=" + id + "'>删除</a></td></tr>"); } rs.close(); stmt.close(); con.close(); } catch (Exception e) { out.println("Exception:" + e.getMessage()); } %> </table> <br /> <hr /> <div style="text-align: center; width: 100%; font-size: 12px; color: #333;"> ©版权所有：石家庄铁道大学信息科学与技术学院 <a href="Lab03.png" target="_blank">网站地图</a> </div> </body> </html>
error.jsp文件代码
<%@ page language="java" isErrorPage="true" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>error page</title> </head> <body> 错误信息为：<br/> <%=exception.getMessage()%><br> <%=exception.toString()%> </body> </html>
<%@ page contentType="text/html; charset=utf-8" import="java.sql.*" errorPage="error.jsp"%> <html> <head> <title>添加学生信息</title> <link rel="stylesheet" type="text/css" href="css/style.css"> </head> <body> <script type="text/javascript"> function checkform(form) { if(form.id.value=="") { alert("学号不能为空"); form.name.focus(); return false; } if(form.name.value=="") { alert("姓名不能为空"); form.name.focus(); return false; } if(form.sex.value=="") { alert("性别不能为空"); form.name.focus(); return false; } if(form.birth.value=="") { alert("出生年月不能为空"); form.name.focus(); return false; } if(form.address.value=="") { alert("住址不能为空"); form.name.focus(); return false; } return true; } </script> <form action="addsave.jsp" method="post" onsubmit="return checkform(this);"> <h2>添加学生信息</h2> <table style="width: 50%"> <tr> <th width="30%">学号：</th> <td width="70%"><input name="id" type="text"></td> </tr> <tr> <th>姓名：</th> <td><input name="name" type="text"></td> </tr> <tr> <th>性别：</th> <td><input name="sex" type="text"></td> </tr> <tr> <th>出生年月：</th> <td><input name="birth" type="text"></td> </tr> <tr> <th>住址：</th> <td><input name="address" type="text"></td> </tr> <tr> <td colspan="2"><input type="submit" name="submit" value="添加"> <input type="reset" value="重置"></td> </tr> </table> </form> </body> </html>
<%@ page contentType="text/html; charset=utf-8" import="java.sql.*" errorPage="error.jsp"%> <html> <head> <title>添加学生信息</title> <link rel="stylesheet" type="text/css" href="css/style.css"> </head> <body> <% request.setCharacterEncoding("utf-8"); String id = request.getParameter("id"); String name = request.getParameter("name"); String sex = request.getParameter("sex"); String birth = request.getParameter("birth"); String address = request.getParameter("address"); Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf-8", "root", "123456"); PreparedStatement stmt = con.prepareStatement("insert into studentinfo(id,name,sex,birth,address) values(?,?,?,?,?)"); stmt.setString(1, id); stmt.setString(2, name); stmt.setString(3, sex); stmt.setString(4, birth); stmt.setString(5, address); int i = stmt.executeUpdate(); if (i == 1) { out.println("<h2>添加成功！</h2><br/>"); out.println("<a href='index.jsp'>返回首页</a>"); } else { out.println("<h2>添加失败！</h2><br/>"); out.println("<a href='add.jsp'>重新添加</a>"); } stmt.close(); con.close(); %> </body> </html>
<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" pageEncoding="utf-8"%> <html> <head> <title>删除学生信息</title> <link rel="stylesheet" type="text/css" href="css/style.css"> </head> <body> <% request.setCharacterEncoding("utf-8"); Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf-8", "root", "123456"); Statement stmt=con.createStatement(); String id=request.getParameter("id"); int i=stmt.executeUpdate("delete from studentinfo where id="+id); if(i==1) { out.println("<h2>删除成功！</h2><br/>"); } else { out.println("<h2>删除失败！</h2><br/>"); } out.println("<a href='index.jsp'>返回首页</a>"); stmt.close(); con.close(); %> </body> </html>
<%@ page import="java.sql.*" pageEncoding="utf-8" errorPage="error.jsp"%> <html> <head> <title>修改学生信息</title> <link rel="stylesheet" type="text/css" href="css/style.css"> </head> <body> <% request.setCharacterEncoding("utf-8"); String id = request.getParameter("id"); Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf-8", "root", "123456"); //Statement stmt = con.createStatement(); //ResultSet rs = stmt.executeQuery("select * from student where id=" + id); PreparedStatement stmt = con.prepareStatement("select * from studentinfo where id=?"); stmt.setString(1, id); ResultSet rs = stmt.executeQuery(); rs.next(); %> <form action="editsave.jsp" method="post"> <h2>修改学生信息</h2> <table style="width:50%"> <tr> <th width="30%">学号：</th> <td width="70%"><input name="id" type="text" value="<%=rs.getString(1)%>"></td> </tr> <tr> <th>姓名：</th> <td><input name="name" type="text" value="<%=rs.getString(2)%>"></td> </tr> <tr> <th>性别：</th> <td><input name="sex" type="text" value="<%=rs.getString(3)%>"></td> </tr> <tr> <th>出生年月：</th> <td><input name="birth" type="text" value="<%=rs.getString(4)%>"></td> </tr> <tr> <th>住址：</th> <td><input name="address" type="text" value="<%=rs.getString(5)%>"></td> </tr> <tr> <td colspan="2"><input type="hidden" name="id" value="<%=id%>"> <input type="submit" value="修改"> <input type="reset" value="重置"></td> </tr> </table> </form> <% rs.close(); stmt.close(); con.close(); %> </body> </html>
<%@ page import="java.sql.*" pageEncoding="utf-8" errorPage="error.jsp"%> <html> <head> <title>修改完成</title> <link rel="stylesheet" type="text/css" href="css/style.css"> </head> <body> <% request.setCharacterEncoding("utf-8"); String name = request.getParameter("name"); String sex = request.getParameter("sex"); String birth = request.getParameter("birth"); String address = request.getParameter("address"); String id = request.getParameter("id"); Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf-8", "root", "123456"); Statement stmt = con.createStatement(); String sql = "update studentinfo set name='" + name + "',sex='"+ sex + "',birth='" + birth + "',address='" + address + "' where id=" + id; int i = stmt.executeUpdate(sql); if (i == 1) { out.println("<h2>修改成功！</h2><br/>"); out.println("<a href='index.jsp'>返回首页</a>"); } else { out.println("<h2>修改失败！</h2><br/>"); out.println("<a href='edit.jsp?id='" + id + ">重新添加</a>"); } stmt.close(); con.close(); %> </body> </html>
