课堂练习1
2017-11-28 17:57
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源代码
<%@ 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>
<title>用户添加页面</title>
<script type="text/javascript">
function check(form) {
teacher = form.password.value;
didian = form.nickname.value;
if(form.username.value == ""){
alert("课程名称不能为空");
return false;
}
if(form.password.value == ""){
alert("任课教师不能为空");
return false;
}
if((teacher!= "王建民")&&(teacher!= "刘立嘉")&&(teacher!= "刘丹")&&(teacher!= "王辉")&&(teacher!= "杨子光")){
alert("任课教师错误");
return false;
}
if(form.nickname.value == ""){
alert("教学地点不能为空");
return false;
}
/*if((didian != "基教")&&(didian != "基教405")){
alert("教学地点错误");
return false;
}*/
if((didian.indexOf("基教")!=0)&&(didian.indexOf("一教")!=0)&&(didian.indexOf("二教")!=0)&&(didian.indexOf("三教")!=0)){
alert("教学地点错误");
return false;
}
return true;
}
</script>
</head>
<body>
<%request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
%>
<jsp:include page="inc.jsp">
<jsp:param name="every" value="添加" />
</jsp:include>
<form name = "form1" action = "add.jsp" method = "post" onsubmit = "return check(form1)" >
<table align="center" border="1" width="500">
<tr>
<td>课程名称 : </td>
<td>
<input type="text" name="username" />
</td>
</tr>
<tr>
<td>任课教师:</td>
<td>
<input type="text" name="password" />
</td>
</tr>
<tr>
<td>教学地点:</td>
<td>
<input type="text" name="nickname" />
</td>
</tr>
<tr align="center">
<td colspan="2">
<input type="submit" value="提交" />
<input type="reset" value="重置" />
</td>
</tr>
</table>
</form>
</body>
</html>
连接数据库
package com.jaovo.msg.dao;
import java.sql.*;
import java.util.*;
import com.jaovo.msg.Util.DBUtil;
import com.jaovo.msg.Util.UserException;
import com.jaovo.msg.model.User;
public class UserDaoImpl implements IUserDao{
@Override
public void add(User user) {
//获得链接对象
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select count(*) from usertable 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());
//接收结果集
resultSet = preparedStatement.executeQuery();
//遍历结果集
while(resultSet.next()) {
if (resultSet.getInt(1) > 0) {
throw new UserException("用户已存在") ;
}
}
sql = "insert into usertable(username,password,nickname) values(?,?,?)";
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, user.getUsername());
preparedStatement.setString(2, user.getPassword());
preparedStatement.setString(3, user.getNickname());
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);
}
}
@Override
public void delete(int id) {
// TODO Auto-generated method stub
Connection connection = DBUtil.getConnection();
String sql = "delete from usertable where id = ?";
PreparedStatement preparedStatement = null;
try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setInt(1, id);
preparedStatement.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}
@Override
public void update(User user) {
// TODO Auto-generated method stub
Connection connection = DBUtil.getConnection();
String sql = "update usertable set password = ?,nickname = ? where id = ?";
PreparedStatement preparedStatement =null;
try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, user.getPassword());
preparedStatement.setString(2, user.getNickname());
preparedStatement.setInt(3, user.getId());
preparedStatement.executeUpdate();
}catch (SQLException e ){
e.printStackTrace();
}finally {
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}
@Override
public User load(int id) {
Connection connection = DBUtil.getConnection();
String sql = "select * from usertable where id = ?";
PreparedStatement preparedStatement = null;
ResultSet resultSet=null;
User user = null;
try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setInt(1, id);
resultSet = preparedStatement.executeQuery();
while(resultSet.next()) {
user = new User();
user.setId(id);
user.setUsername(resultSet.getString("username"));
user.setPassword(resultSet.getString("password"));
user.setNickname(resultSet.getString("nickname"));
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally {
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
// TODO Auto-generated method stub
return user;
}
@Override
public User load(String username) {
// TODO Auto-generated method stub
Connection connection = DBUtil.getConnection();
String sql = "select * from usertable where username = ?";
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
User user =null;
try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, username);
resultSet = preparedStatement.executeQuery();
while(resultSet.next()) {
user = new User();
user.setId(resultSet.getInt("id"));
user.setUsername(username);
user.setPassword(resultSet.getString("password"));
user.setNickname(resultSet.getString("nickname"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
return user;
}
@Override
public List<User> load() {
// TODO Auto-generated method stub
Connection connection = DBUtil.getConnection();
String sql = "select * from usertable";
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
List<User> users = new ArrayList<User>();
User user =null;
try {
preparedStatement = connection.prepareStatement(sql);
resultSet = preparedStatement.executeQuery();
while(resultSet.next()) {
user =new User();
user.setId(resultSet.getInt("id"));
user.setUsername(resultSet.getString("username"));
user.setPassword(resultSet.getString("password"));
user.setNickname(resultSet.getString("nickname"));
users.add(user);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
return users;
}
@Override
public User login(String username, String password) {
Connection con = DBUtil.getConnection();
PreparedStatement pra = null;
ResultSet rs = null;
User user = null;
String sql = "select * from usertable where username = ?";
try {
pra = con.prepareStatement(sql);
pra.setString(1,username);
rs = pra.executeQuery();
while(rs.next()) {
user = new User();
user.setId(rs.getInt("id"));
user.setUsername(username);
user.setPassword(rs.getString("password"));
user.setNickname(rs.getString("nickname"));
}
if(user==null)throw new UserException("该用户不存在");
if(!user.getPassword().equals(password))throw new UserException("密码错误");
} catch (SQLException e) {
System.out.println(e.getMessage());
}
return user;
}
}
实验截图
数据库中表
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