软件工程概论第一次课堂测试

设计思想：

首先建立一个User类，用于存储教师姓名，课程，以及教室名称，并且写上赋值和取值方法。

然后建立一个工具类用于连接数据库、

建立一个操作类用于访问数据库，对数据库进行添加，遍历。

最后建立一个Tianbiao.jsp，Baocun.jsp俩个jsp文件，Tianbiao.jsp用于输出表，用户输入信息，Baocun.jsp用于判断输入的信息是否符合要求或者是否已经存在。

源代码：

package com.jaovo.msg.Model;

public class User {
    private String Username;
    private String Kecheng;
    private String Didian;
    public String getUsername() {
        return Username;
    }
    public void setUsername(String username) {
        Username = username;
    }
    public String getKecheng() {
        return Kecheng;
    }
    public void setKecheng(String kecheng) {
        Kecheng = kecheng;
    }
    public String getDidian() {
        return Didian;
    }
    public void setDidian(String didian) {
        Didian = didian;
    }

}
工具类：
package com.jaovo.msg.Util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtil {
    public static Connection getConnection()
    {
                //加载驱动
                try {
                    Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
                } catch (InstantiationException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                } catch (IllegalAccessException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                } catch (ClassNotFoundException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
                 String user = "sa";
                 String password = "zlq521415";
                 String url = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=Users";// 数据源
            
                 Connection con =null;
            try {
                 con = DriverManager.getConnection(url, user, password);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }// 连接数据库对象
      
           return con;
    }
    public static void close(Connection connection)
    {
        try {
            if(connection!=null)
            connection.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void close(PreparedStatement preparedstatement)
    {
        try {
            if(preparedstatement!=null)
                preparedstatement.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void close(ResultSet resultSet)
    {
        try {
            if(resultSet!=null)
                resultSet.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}
package com.jaovo.msg.Util;

public class UserException extends RuntimeException{

    public UserException() {
        super();
        // TODO Auto-generated constructor stub
    }

    public UserException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
        super(message, cause, enableSuppression, writableStackTrace);
        // TODO Auto-generated constructor stub
    }

    public UserException(String message, Throwable cause) {
        super(message, cause);
        // TODO Auto-generated constructor stub
    }

    public UserException(String message) {
        super(message);
        // TODO Auto-generated constructor stub
    }

    public UserException(Throwable cause) {
        super(cause);
        // TODO Auto-generated constructor stub
    }
    

}
package com.jaovo.msg.Util;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

public class UtilEmpty {
    public static  boolean validateNull(HttpServletRequest request,String[] fileds) {
        boolean validate = true;
        //map对象用来装载不同的错误信息
        Map<String,String> errorMsg = new  HashMap();
        for(String filed :fileds) {
            String value = request.getParameter(filed);
            if (value == null || "".equals(value.trim())) {
                validate = false;
                errorMsg.put(filed, filed+"不能为空");
            }
            if (!validate) {
                request.setAttribute("errormsg", errorMsg);
            }
            
        }
        
        return validate;
    }
    public static String showError(HttpServletRequest request , String filed) {
        Map<String, String> errorMsg = (Map<String,String>)request.getAttribute("errormsg");
        if (errorMsg == null) {
            return "";
        }
        String msg = errorMsg.get(filed);
        if (msg == null) {
            return "";
        }
        return msg;
    }
    
}
操作类：
package com.jaovo.msg.Dao;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.jaovo.msg.Util.DBUtil;
import com.jaovo.msg.Model.User;

public class UserDao extends User {

    
    public void addMessage(User user) {
        //获得连接对象
        Connection connection = DBUtil.getConnection();
        //创建语句传输对象
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        try {
            //遍历结果集
            String sql="insert into teacher (Kecheng,Username,Didian) values (?,?,?)";
            preparedStatement=connection.prepareStatement(sql);
            preparedStatement.setString(1, user.getKecheng());
            preparedStatement.setString(2, user.getUsername());
            preparedStatement.setString(3, user.getDidian());
            preparedStatement.executeUpdate();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            //关闭资源
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
            
        }
    }
    public boolean load(User user) {
        boolean jud=true;
        //获得连接对象
           Connection connection = DBUtil.getConnection();
            //准备sql语句
           String sql = "select * from teacher where Username=?";
            //创建语句传输对象
           PreparedStatement preparedStatement = null;
           ResultSet resultSet=null;
           try {
            preparedStatement=connection.prepareStatement(sql);
            preparedStatement.setString(1, user.getUsername());
            resultSet=preparedStatement.executeQuery();
            while(resultSet.next())
            {
                if((user.getUsername().equals(resultSet.getString("Username")))&&(user.getDidian().equals(resultSet.getString("Didian")))&&(user.getKecheng().equals(resultSet.getString("Kecheng"))))
                {jud=false;}
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
        return jud;
    }
    public static  boolean validate(User user) 
    {
        boolean validate = false;
        String jiaoshi[]={"王建民","刘丹","刘立嘉","王辉"};
        for(int i=0;i<4;i++)
        {
            if(user.getUsername().equals(jiaoshi[i]))
                validate=true;
        }
        
        return validate;
    }
    public static  boolean validate1(User user) {
        boolean validate = false;
        String didian[]={"基教","一教","二教","三教"};
        for(int i=0;i<4;i++)
        {
            if(user.getDidian().startsWith(didian[i]))
                validate=true;
        }
        
        return validate;
    }
}

<%@page import="com.jaovo.msg.Dao.UserDao"%>
<%@page import="com.jaovo.msg.Util.UtilEmpty"%>
<%@page import="com.jaovo.msg.Util.UserException"%>
<%@page import="com.jaovo.msg.Model.User"%>
<%@ 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 background="C:Users张强PicturesSaved Pictures/1505615532655.jpg">
<%
    String kecheng = request.getParameter("kecheng");
    String username = request.getParameter("username");
    String didian = request.getParameter("didian");
    User user=new User(); UserDao userDao = new UserDao();
    user.setDidian(didian);user.setKecheng(kecheng);user.setUsername(username);
    boolean validate =UtilEmpty.validateNull(request, new String[]{"kecheng","username","didian"});
    if(!validate){
    %>
    <jsp:forward page="Tianbiao.jsp"></jsp:forward>
<%
    }
    if(!userDao.load(user)){
        request.setAttribute("error1","该信息已经存在");
        %>
        <jsp:forward page="Tianbiao.jsp"></jsp:forward>
    <%
        }
    if(!userDao.validate(user))
    {
        request.setAttribute("error", "教师姓名不符合，请重新输入");
%>
<jsp:forward page="Tianbiao.jsp"></jsp:forward>
<%
    }
    if(!userDao.validate1(user))
    {
        request.setAttribute("error", "教室名称不符合，请重新输入");
        %>
    <jsp:forward page="Tianbiao.jsp"></jsp:forward>
        <%
    }
    try{
    userDao.addMessage(user);
%>
保存成功<br>
<%
    }catch(UserException e){
%>
    <h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2>
    <%
    }
    %>
      
</body>
</html>
<%@page import="com.jaovo.msg.Util.UtilEmpty"%>
<%@page import="com.jaovo.msg.Dao.UserDao"%>
<%@page import="com.jaovo.msg.Model.User"%>
<%@ 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>
 <form action="Baocun.jsp" method="get">
<body background="C:Users张强PicturesSaved Pictures/1505615532655.jpg">
<%=request.getAttribute("error") %>
<%if(request.getAttribute("error1")!=null)
    {
    out.print("<script language='javaScript'>alert('该信息已经存在');</script>");
    }
    %>
    
       <table align="center" border="1" width="500">
    <tr>
                <td>课程名称 : </td>
                <td>
                    <input type="text" name="kecheng" />
                    <%=UtilEmpty.showError(request, "kecheng") %>
                </td>
            </tr>
                <tr>
                <td>任课教师:</td>
                <td>
                    <input type="text" name="username" />
                    <%=UtilEmpty.showError(request, "username") %>
                </td>
            </tr>
            <tr>
                <td>教室地点:</td>
                <td>
                    <input type="text" name="didian" />
                    <%=UtilEmpty.showError(request, "didian") %>
                    </td>
                    </tr>
                        <tr align="center">
                <td colspan="2">
                    <input type="submit" value="保存" />
                    </table>
</body>
</form>
</html>

结果截图：

 

实验分析：

在教室写的时候我开始打算修改培训老师的代码，增加俩个jsp文件，但是写好之后Tomcat连不上，后来找到原因是因为项目中的没上课的时候xml文件我修改过，改好之后，我新建了一个web项目，开始自己写代码，遇到的错误大多是因为粗心，比如还未给user对象赋值就调用该对象，导致结果一直不对，改好之后，能实现基本操作，完善的时候借鉴了同学的弹出窗口代码，当信息存在的时候弹出。

耗费时间：

上课一节课，下课后吃过午饭后从一点开始到俩点多的时候完善完毕。