标签：sql语句 dtd one org enter img tran jdb 静态
在DButil.java文件定义连接数据库的静态方法getConnection()
在ClassDao.java文件中定义让数据库添加数据的方法Add()
.在WebContent目录下建立addClass.jsp文件，在此jsp文件中添加表单，通过表单将输入的信息提交至class.jsp,然后进行判断输入的格式是否正确，然后写入数据库
DButil.java
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; import java.util.Properties; import javax.naming.Context; import javax.naming.InitialContext; import javax.sql.DataSource; public class DBUtil { public static Connection getConnection() { try { Class.forName("com.mysql.jdbc.Driver").newInstance(); } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e1) { e1.printStackTrace(); } String user = "root"; String password = "root"; String url = "jdbc:mysql://localhost:3306/wei"; Connection connection = null; try { connection = DriverManager.getConnection(url, user, 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(); } } }
ClassDao.java
package com.jaovo.msg.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import com.jaovo.msg.Util.DBUtil; import com.jaovo.msg.model.Class; import com.jaovo.msg.dao.ClassDao; public class ClassDao { public void add(Class course) { //或得数据库连接对象 Connection connection = DBUtil.getConnection(); //准备SQL语句 String sql =null; //"select count(*) from tab_user where username=?"; //声明数据库准备执行对象,但是没有实例化,赋值为空 PreparedStatement preparedStatement = null; //声明一个结果集对象,用于接收,我们我们pre执行后,发送到数据库的sql语句,然后数据库执行,在然后返回到我们程序端的 //结果集对象 //ResultSet resultSet = null; 数据库,让数据库处理,然后把结果集返回回来,用resultSet. //这个是重点,这里才是真正连接数据库,然后执行的地方 resultSet = preparedStatement.executeQuery(); while(resultSet.next()) { if(resultSet.getInt(1)>0) throw new UserException("用户已存在"); }*/ try { sql="insert into tab_course(classname,classtea,classspace) value(?,?,?)"; preparedStatement = connection.prepareStatement(sql); preparedStatement.setString(1, course.getClassname()); preparedStatement.setString(2, course.getClasstea()); preparedStatement.setString(3, course.getClassplace()); preparedStatement.executeUpdate(); } catch (SQLException e) { e.printStackTrace(); } finally { //DBUtil.close(resultSet); DBUtil.close(preparedStatement); DBUtil.close(connection); } } }
addClass.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</title>
</head>
<body>
<center><%=request.getAttribute("result") %>
<form action="class.jsp" method ="get">
<table align="center" border="1" width="500">
<tr>
<td>课程名</td>
<td>
<input type="text" name="classname"/>
</td>
</tr>
<tr>
<td>任课老师</td>
<td>
<input type="text" name="classtea"/>
</td>
</tr>
<tr>
<td>课堂地点</td>
<td>
<input type="text" name="classspace"/>
</td>
</tr>
<tr align="center">
<td colspan="2"><input type="submit" value="添加"/></td>
</tr>
</table>
</form>
</center>
</body>
</html>
class.jsp
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@ page import="com.jaovo.msg.model.Class"%> <%@ page import="com.jaovo.msg.dao.ClassDao"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <% String classname = request.getParameter("classname"); String classtea = request.getParameter("classtea"); String classspace = request.getParameter("classspace"); if(classtea.equals("王建民")||classtea.equals("刘丹")||classtea.equals("刘立嘉")||classtea.equals("王辉")||classtea.equals("杨子光")) { } else { request.setAttribute("result","请输入在职老师"); %> <jsp:forward page="addClass.jsp"></jsp:forward> <% } if(classspace.startsWith("基教")||classspace.startsWith("一教")||classspace.startsWith("二教")||classspace.startsWith("三教")) { } else { request.setAttribute("result","请输入正确地点"); %> <jsp:forward page="addClass.jsp"></jsp:forward> <% } Class course=new Class(); course.setClassname(classname); course.setClasstea(classtea); course.setClassplace(classspace); ClassDao classDao=new ClassDao(); classDao.add(course); request.setAttribute("result","课程添加成功"); %> <jsp:forward page="addClass.jsp"></jsp:forward> <body> </body> </html>
运行结果截图
标签：sql语句 dtd one org enter img tran jdb 静态
原文地址：http://www.cnblogs.com/wei-jing/p/7912725.html
