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软件工程课堂练习2

2017-11-28 20:31 239 查看
按照图片要求设计添加新课程界面



要求判断任课教师、上课地点。
实现数据存储功能。
设计思想：
用java web实现。
定义教师类UserBean及其属性，连接数据库类DBUtil，数据库操作类UserDao。
用JSP实现界面。
源代码：
UserBean:

package Bean;

public class UserBean {
private String classname;
private String teacher;
private String classroom;

public void setClassName(String classname) {
this.classname = classname;
}
public String getClassName() {
return classname;
}
public void setTeacher(String teacher) {
this.teacher = teacher;
}
public String getTeacher() {
return teacher;
}
public void setClassRoom(String classroom) {
this.classroom = classroom;
}
public String getClassRoom() {
return classroom;
}
}


DBUtil:

package util;

import java.sql.*;
public class DBUtil {
public static Connection getConnection() {
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
} catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String username = "sa";
String password = "luohaochi123";
String url = "jdbc:sqlserver://localhost:1433;DatabaseName=Teacher";
Connection connection = null;
try {
connection = DriverManager.getConnection(url, username, password);
}
catch (SQLException e) {
e.printStackTrace();
}
return connection;
}
public static void close(Connection connection) {
try {
if (connection != null) {
connection.close();
}
}
catch (SQLException e) {
e.printStackTrace();
}
}
public static void close(PreparedStatement preparedStatement) {
try {
if (preparedStatement != null) {
preparedStatement.close();
}
}
catch (SQLException e) {
e.printStackTrace();
}
}
public static void close(ResultSet resultSet) {
try {
if (resultSet != null) {
resultSet.close();
}

} catch (SQLException e) {
e.printStackTrace();
}
}
}


UserDao：

package Dao;

import java.sql.*;
import util.DBUtil;
import Bean.UserBean;
import Bean.UserException;
public class UserDao {
public void add(UserBean user) {
Connection connection=DBUtil.getConnection();
String sql = "select * from user1 where teacher = ?";
PreparedStatement preparedStatement=null;
ResultSet resultSet=null;
try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1,user.getTeacher());
resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
if (resultSet.getInt(1) > 0) {
throw new UserException("错误") ;
}
}
sql = "insert into user1 (classname,teacher,classroom) values(?,?,?)";
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, user.getClassName());
preparedStatement.setString(2, user.getTeacher());
preparedStatement.setString(3, user.getClassRoom());
preparedStatement.executeUpdate();
}
catch (SQLException e) {
e.printStackTrace();
}
finally {
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}
}


输入界面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%response.setCharacterEncoding("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>添加课程信息</title>
</head>
<body>
<form action='add.jsp' method ="post">
<%
if(request.getAttribute("error")!=null||"".equals(request.getAttribute("error")))
{
%>
<%=request.getAttribute("error") %>
<%
}
%>
<%
if(request.getAttribute("error1")!=null||"".equals(request.getAttribute("error1")))
{
%>
<%=request.getAttribute("error1") %>
<%
}
%>
<%
if(request.getAttribute("error2")!=null||"".equals(request.getAttribute("error2")))
{
%>
<%=request.getAttribute("error2") %>
<%
}
%>
<%
if(request.getAttribute("error3")!=null||"".equals(request.getAttribute("error3")))
{
%>
<%=request.getAttribute("error3") %>
<%
}
%>
<%
if(request.getAttribute("error4")!=null||"".equals(request.getAttribute("error4")))
{
%>
<%=request.getAttribute("error4") %>
<%
}
%>
<table align="center" >
<tr>
<td>课程名称:</td>
<td>
<input type="text" name="classname"/>
</td>
</tr >
<tr>
<td>任课教师:</td>
<td>
<input type="text" name="teacher"/>
</td>
</tr>
<tr>
<td>上课地点:</td>
<td>
<input type="text" name="classroom"/>
</td>
</tr>
<tr align="center">
<td colspan="2">
<input type="submit" value="保存" />
</td>
</tr>
</table>
</form>
</body>
</html>


处理界面：

<%@page import="Dao.UserDao"%>
<%@page import="Bean.UserBean"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%response.setCharacterEncoding("UTF-8");%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<%
request.setCharacterEncoding("utf-8");
String classname=request.getParameter("classname");
String teacher=request.getParameter("teacher");
String classroom=request.getParameter("classroom");
if(classname==null||"".equals(classname.trim())){
request.setAttribute("error", "课程名称不能为空！");
%>
<jsp:forward page="addinput.jsp"></jsp:forward>
<%
}
if(teacher==null||"".equals(teacher.trim())){
request.setAttribute("error1", "任课教师不能为空！");
%>
<jsp:forward page="addinput.jsp"></jsp:forward>
<%
}
if(classroom==null||"".equals(classroom.trim())){
request.setAttribute("error2", "上课地点不能为空！");
%>
<jsp:forward page="addinput.jsp"></jsp:forward>
<%
}
if(!("王建民".equals(teacher.trim())||"刘立嘉".equals(teacher.trim())||"刘丹".equals(teacher.trim())||"王辉".equals(teacher.trim())||"杨子光".equals(teacher.trim())))
{
request.setAttribute("error3", "任课教师超出范围！");
%>
<jsp:forward page="addinput.jsp"></jsp:forward>
<%
}
if(!(classroom.startsWith("基教")||classroom.startsWith("一教")||classroom.startsWith("二教")||classroom.startsWith("三教")))
{
request.setAttribute("error4", "上课地点超出范围！");
%>
<jsp:forward page="addinput.jsp"></jsp:forward>
<%
}
UserBean user=new UserBean();
user.setClassName(classname);
user.setTeacher(teacher);
user.setClassRoom(classroom);
UserDao dao=new UserDao();
dao.add(user);
%>
<jsp:forward page="success.jsp"></jsp:forward><%
%>
</html>


成功界面：

<%@ 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>保存成功</title>
</head>
<body>
保存成功！！<br>
<a href="addinput.jsp">继续保存</a><br>
</body>
</html>


截图：









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