软件工程概论课堂测试一————添加新课程（web）

设计思想

三个文件Class_add.java  add.jsp  addInput.jsp

Class_add.java : 内封装方法：连接数据库、向数据库添加课程信息、判断非合理的输入情况、判断添加的课程是否重复。

addInput.jsp      :  完成显示输入界面，点击保存后跳转到addInput.jsp。

add.jsp              :  处理输入的数据，并给出相应的交互提示。

源程序代码

Class_add.java :

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

public class Classe_add
{

    private String className;
    private String teacher;
    private String classSpace;

    public String getClassName() {
        return className;
    }
    public void setClassName(String className) {
        this.className = className;
    }
    public String getTeacher() {
        return teacher;
    }
    public void setTeacher(String teacher) {
        this.teacher = teacher;
    }
    public String getClassSpace() {
        return classSpace;
    }
    public void setClassSpace(String classSpace) {
        this.classSpace = classSpace;
    }

    public  Connection getConnection()
    {
        try{
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        }catch(ClassNotFoundException e)
        {
            e.printStackTrace();
        }
        String user="SYH";
        String password="q735415630q";
        String url ="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=Test";
        Connection con=null;
        try{
            con=DriverManager.getConnection(url,user,password);
        }catch(SQLException e)
        {
            e.printStackTrace();
        }
        return con;
    }
    public void addClass(String className,String teacher,String classSpace )
    {
        int judge=1;
        Connection connection = getConnection();
        String sql="select count(*) from class_add where className = ?";

        PreparedStatement preparedStatement=null;
        ResultSet resultSet=null;

        try {
            preparedStatement=connection.prepareStatement(sql);
            preparedStatement.setString(1, className);

            resultSet = preparedStatement.executeQuery();
            while(resultSet.next())
            {
                if (resultSet.getInt(1) > 0)
                {
                    System.out.println("课程已存在,无法添加") ;
                    judge=0;
                }
            }
            if(judge==1)
            {
                sql = "insert class_add (className,teacher,classSpace) values (?,?,?)";
                preparedStatement = connection.prepareStatement(sql);
                preparedStatement.setString(1,className);
                preparedStatement.setString(2,teacher);
                preparedStatement.setString(3,classSpace);
                preparedStatement.executeUpdate();
                System.out.println("添加成功") ;
            }
        } catch (SQLException  e)
        {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally
        {
            close(resultSet);
            close(preparedStatement);
            close(connection);
        }
    }

    public  void close (Connection con)
    {
        try{
            if(con!=null)
            {
                con.close();
            }
        }catch(SQLException e)
            {
                e.printStackTrace();
            }
    }
    public  void close (PreparedStatement preparedStatement)
    {
        try{
            if(preparedStatement!=null)
            {
                preparedStatement.close();
            }
        }catch(SQLException e)
        {
            e.printStackTrace();
        }
    }
    public  void close(ResultSet resultSet)
    {
        try{
            if(resultSet!=null)
            {
                resultSet.close();
            }
        }catch(SQLException e)
        {
            e.printStackTrace();
        }
    }
    public boolean judgeInputNull(String className,String teacher,String classSpace)
    {
        boolean flag=false;
        if(className==null||"".equals(className)&&teacher==null||"".equals(teacher)&&classSpace==null||"".equals(classSpace))
        {
            flag=true;
        }
        return flag;
    }
    public boolean judgeClassRepeat(String className,String teacher,String classSpace)
    {

        boolean flag=false;

        Connection connection = getConnection();
        String sql="select * from class_add where className = ?";    

        PreparedStatement preparedStatement=null;
        ResultSet resultSet=null;
        try {
            preparedStatement=connection.prepareStatement(sql);
            preparedStatement.setString(1, className);
            resultSet = preparedStatement.executeQuery();
            while(resultSet.next())
            {

                if(teacher.equals(resultSet.getString("teacher"))&&classSpace.equals(resultSet.getString("classSpace")))
                {
                    flag=true;
                }
            }
        }catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            close(resultSet);
            close(preparedStatement);
            close(connection);
        }
        return  flag;
    }
    public boolean judeInputTeacher(String teacher)
    {
        boolean flag=false;
        if((!teacher.equals("王建民"))&&!teacher.equals("刘立嘉")&&!teacher.equals("刘丹")&&!teacher.equals("王辉")&&!teacher.equals("杨子光"))
        {
            flag=true;
        }

        return flag;
    }
    public boolean judgeInputClassSpace(String space)
    {
        boolean flag=false;
        if(!space.startsWith("一教")&&!space.startsWith("二教")&&!space.startsWith("三教")&&!space.startsWith("基教"))
        {
            flag=true;
        }
        return flag;
    }
    public static void main(String[] args)
    {
        Classe_add a=new Classe_add();
       System.out.println(a.judgeClassRepeat("软件工程", "王建民", "基教405"));

    }
}

addInput.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>课程添加页面 </title>
</head>
<body background="C:\Users\win8\workspace\Arithmetic\image\d602adc701a429f16a32aac5579f113e_7205982_162234868593_2.jpg">
<center style="color:white;font-family:楷体; font-size:20px">
    <form action="add.jsp" method="get">

        <br>
                课程名称:
                    <input type="text" name="className" />
                <br><br>

                任课教师:
                    <input type="text" name="teacher" />
                <br><br>

                上课地点:
                <input type="text" name="classSpace" />
                <br><br>

                    <input type="submit" value="保存" />
                    <input type="reset" value="重置" />
    </form>
    </center>
</body>
</html>

add.jsp              :

<%@page import="util.Classe_add"%>
<%@ 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>
<jsp:useBean id="util" class="util.Classe_add" scope="page" />
<%

  Classe_add a=new Classe_add();

  String className=(String)request.getParameter("className");
  String teacher=(String)request.getParameter("teacher");
  String classSpace=(String)request.getParameter("classSpace");
  if(util.judgeInputNull(className, teacher, classSpace))
  {

      out.print("<script language ='javaScript'> alert('输入不能为空,请输入');window.history.back(-1); </script>");
      //response.setHeader("refresh", "0;url=addInput.jsp");
  }
  else if(util.judeInputTeacher(teacher))
  {
      out.print("<script language='javaScript'> alert('该老师不存在,重新输入');window.history.back(-1);</script>");
     // response.setHeader("refresh", "0;url=addInput.jsp");
  }
  else if(util.judgeInputClassSpace(classSpace))
  {
      out.print("<script language='javaScript'> alert('教室不存在,重新输入');window.history.back(-1);</script>");
      //response.setHeader("refresh", "0;url=addInput.jsp");
  }
  else if(util.judgeClassRepeat(className, teacher, classSpace))
  {
      out.print("<script language='javaScript'> alert('该课程已存在');window.history.back(-1);</script>");
     // response.setHeader("refresh", "0;url=addInput.jsp");
  }
  else {

      util.addClass(className,teacher,classSpace);
      out.print("<script language='javaScript'> alert('添加成功');</script>");
      response.setHeader("refresh", "0;url=addInput.jsp");
  }

%>
</body>
</html>

运行结果截图

界面：

什么都不输入：

正常输入;

重复输入：

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