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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时间： 2024-10-27 18:41:07