软件工程概论第一次课后作业

最新推荐文章于 2025-08-19 18:46:01 发布

weixin_34319111

最新推荐文章于 2025-08-19 18:46:01 发布

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CC 4.0 BY-SA版权

文章标签： java 数据库 javascript ViewUI

原文链接：http://www.cnblogs.com/zhangliqiangvictory/p/7883805.html

本文介绍了一个简单的网站系统开发过程，包括使用Java实现用户管理的基本功能如注册、登录、注销及修改密码等，同时展示了如何通过JSP页面进行交互。

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一.开发网站系统需要的技术：

Javascript技术，HTML技术，SQL语句。

二.源程序代码：

package com.jaovo.msg.dao;

import java.util.List;

import com.jaovo.msg.model.User;

public interface IUserDao {
public void add(User user);
public void delete(User user);
public void update(User user);
public User load(String Username);
public List<User> load();

}

package com.jaovo.msg.dao;

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.Util.UserException;
import com.jaovo.msg.model.User;

public class UserDaoImpl implements IUserDao {

@Override
public void add(User user) {
//获得连接对象
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select count(*) from table_user 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());
//接受结果集
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 table_user(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();
System.out.println("存储成功");
} 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(User user) {
//获得连接对象
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "delete from table_user where Username= ?";
//创建语句传输对象
PreparedStatement preparedStatement = null;
try {
preparedStatement= connection.prepareStatement(sql);
preparedStatement.setString(1, user.getUsername());
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) {
//获得连接对象
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "update table_user set Password = ?,Nickname = ?where Username=?";
//创建语句传输对象
PreparedStatement preparedStatement = null;
try {
preparedStatement= connection.prepareStatement(sql);
preparedStatement.setString(1, user.getPassword());
preparedStatement.setString(2, user.getNickname());
preparedStatement.setString(3,user.getUsername());
preparedStatement.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}

}


@Override
public User load(String Username) {
//获得连接对象
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select * from table_user where Username=?";
//创建语句传输对象
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.setPassword(resultSet.getString("Password"));
user.setUsername("Username");
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() {
//获得连接对象
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select * from table_user";
//创建语句传输对象
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.setPassword(resultSet.getString("Password"));
user.setUsername(resultSet.getString("Username"));
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;
}
public void bianli(User user)
{
//获得连接对象
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select count(*) from table_user 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());
//接受结果集
resultSet=preparedStatement.executeQuery();
//遍历结果集
while(resultSet.next())
{
if(resultSet.getInt(1)==0)
{
throw new UserException("登陆失败，用户不存在") ;
}
}
} 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 int empty(User user)
{
int m=0;
//获得连接对象
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select count(*) from table_user 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());
//接受结果集
resultSet=preparedStatement.executeQuery();
//遍历结果集
while(resultSet.next())
{
if(resultSet.getInt(1)>0)
{
m=1;
}
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
//关闭资源
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);

}
return m;
}
}

package com.jaovo.msg.model;

public class User {
private String Username;
private String Nickname;
private String Password;
public String getUsername() {
return Username;
}
public void setUsername(String username) {
this.Username = username;
}
public String getNickname() {
return Nickname;
}
public void setNickname(String Nickname) {
this.Nickname = Nickname;
}
public String getPassword() {
return Password;
}
public void setPassword(String Password) {
this.Password = Password;
}
}

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
}
}

<%@page import="com.jaovo.msg.Util.UserException"%>
<%@page import="com.jaovo.msg.dao.UserDaoImpl"%>
<%@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>
<%
//接收客户端传递过来的参数
String username = request.getParameter("username");
String password = request.getParameter("password");
String nickname = request.getParameter("nickname");
if(username == null || "".equals(username.trim())){
request.setAttribute("error", "用户名不能为空");

%>
<jsp:forward page="userInput.jsp"></jsp:forward>
<%
}
User user = new User();

user.setUsername(username);
user.setPassword(password);
user.setNickname(nickname);

UserDaoImpl userDao = new UserDaoImpl();
try{
userDao.add(user);
%>


注册成功!!<br>
<a href="enterInput.jsp">返回登录</a><br>
<%
}catch(UserException e){
%>
<h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2>
<%
}
%>
</html>
<%@page import="com.jaovo.msg.Util.UserException"%>
<%@page import="com.jaovo.msg.dao.UserDaoImpl"%>
<%@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>
<%
	//接收客户端传递过来的参数
	String username = request.getParameter("username");
	String password = request.getParameter("password");
	if(username == null || "".equals(username.trim())){
		request.setAttribute("error", "用户名不能为空");
	
%>
	<jsp:forward page="deleteInput.jsp"></jsp:forward>
<%
}
	User user = new User();
	
	user.setUsername(username);
	user.setPassword(password);
	
	UserDaoImpl userDao = new UserDaoImpl();
	if(userDao.empty(user)==0)
	{
		request.setAttribute("error1", "用户不存在");
%>
<jsp:forward page="deleteInput.jsp"></jsp:forward>
<%
	}
	try{
		
	userDao.delete(user);
%>
	注销成功!!<br>
	<a href="enterInput.jsp">返回登录界面</a><br>
<%
	}catch(UserException e){
%>
	<h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2>
	<%
	}
	%>
</html>
<%@ 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>用户注销页面</title>
</head>
<body background="C:\Users\张强\Pictures\Saved Pictures/1505615532655.jpg">
	<%=request.getAttribute("error") %>
	<%=request.getAttribute("error1") %>
	 <form action="delete.jsp" method="get">
		<table align="center" border="1" width="500">
		<h2  align="center">用户注销界面</h2>
			<tr>
				<td>用户名称 : </td>
				<td>
					<input type="text" name="username" />
				</td>
			</tr>
				<tr>
    			<td>用户密码:</td>
    			<td>
    				<input type="password" name="password" />
    			</td>
    		</tr>
    		<tr align="center">
    			<td colspan="2">
    				<input type="submit" value="注销" />
    			</td>
    		</tr>
		</table>
	</form>
</body>
</html>
<%@page import="com.jaovo.msg.Util.UserException"%>
<%@page import="com.jaovo.msg.dao.UserDaoImpl"%>
<%@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>
       <title>用户登陆界面</title> 
  </head>
  <%
	//接收客户端传递过来的参数
	String username = request.getParameter("username");
	String password = request.getParameter("password");
	String nickname = request.getParameter("nickname");
	if(username == null || "".equals(username.trim())){
		request.setAttribute("error", "用户名不能为空");
	
%>
	<jsp:forward page="userInput.jsp"></jsp:forward>
	<%
}
	User user = new User();
	
	user.setUsername(username);
	user.setPassword(password);
	user.setNickname(nickname);
	
	UserDaoImpl userDao = new UserDaoImpl();
	try{
	userDao.bianli(user);
%>
	登陆成功!!<br>
<%
	}catch(UserException e){
%>
	<h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2>
	<%
	}
	%>
</html>
<%@ 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>用户登陆页面</title>
</head>
<body background="C:\Users\张强\Pictures\Saved Pictures/1505615532655.jpg">
	<%=request.getAttribute("error") %>
	 <form action="enter.jsp" method="get">
		<table align="center" border="1" width="500">
		<h2  align="center">登录界面</h2>
			<tr>
				<td>用户名称 : </td>
				<td>
					<input type="text" name="username" />
				</td>
			</tr>
				<tr>
    			<td>用户密码:</td>
    			<td>
    				<input type="password" name="password" />
    			</td>
    		</tr>
    		<tr>
    			<td>用户昵称:</td>
    			<td>
    				<input type="text" name="nickname" />
    			</td>
    		</tr>
    		<script>
             function a(){
                       window.open("userInput.jsp",'_blank') 
                           }
            </script>
            <script>
             function b(){
                       window.open("deleteInput.jsp",'_blank') 
                           }
            </script>
             <script>
             function c(){
                       window.open("updateInput.jsp",'_blank') 
                           }
            </script>
             <script>
             function d(){
                       window.open("list.jsp",'_blank') 
                           }
            </script>
    		<tr align="center">
    			<td colspan="2">
    				<input type="submit" value="登陆" />
    				<input type="button" value="注册" onclick="a()"/>
    			</td>
    		</tr>
    		<tr align="center">
    		     <td  colspan="2">
    		     <input type="button" value="注销用户" onclick="b()"/>
    		     <input type="button" value="修改密码" onclick="c()"/>
    		     </td>
    		</tr>
    		<tr align="center">
    		     <td  colspan="2">
    		     <input type="button" value="显示所有用户" onclick="d()"/>
    		     </td>
    		</tr>
    		     
		</table>
	</form>
</body>
</html>
<%@page import="com.jaovo.msg.model.User"%>
<%@page import="java.util.List"%>
<%@page import="com.jaovo.msg.dao.UserDaoImpl"%>
<%@ 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>用户展示界面</title>
</head>
<%
	UserDaoImpl userDao = new UserDaoImpl();
	List<User> users = userDao.load();
%>
<body background="C:\Users\张强\Pictures\Saved Pictures/1505615532655.jpg">
<form action="delete.jsp" method="get">
	<table align="center" border="1" width="500">
		<tr>
			<td>用户名称</td>
			<td>用户密码</td>
			<td>用户昵称</td>
		</tr>
		<%
			for( User user : users ){
	           
		%>
		<tr>
			<td> <%=user.getUsername() %></td>
			<td> <%=user.getPassword() %></td>
			<td> <%=user.getNickname() %></td>
			
		</tr>
		<%
			}
		%>
	</table>
	</form>
</body>
</html>
<%@page import="com.jaovo.msg.Util.UserException"%>
<%@page import="com.jaovo.msg.dao.UserDaoImpl"%>
<%@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>
<%
	//接收客户端传递过来的参数
	String username = request.getParameter("username");
	String password = request.getParameter("password");
	String nickname = request.getParameter("nickname");
	if(username == null || "".equals(username.trim())){
		request.setAttribute("error", "用户名不能为空");
	
%>
	<jsp:forward page="updateInput.jsp"></jsp:forward>
<%
}
	User user = new User();
	
	user.setUsername(username);
	user.setPassword(password);
	user.setNickname(nickname);
	
	UserDaoImpl userDao = new UserDaoImpl();
	if(userDao.empty(user)==0)
	{
		request.setAttribute("error1", "用户不存在");
%>
<jsp:forward page="updateInput.jsp"></jsp:forward>
<%
	}
	try{
		
	userDao.delete(user);
	userDao.add(user);
%>
	修改成功!!<br>
	<a href="enterInput.jsp">返回登录界面</a><br>
<%
	}catch(UserException e){
%>
	<h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2>
	<%
	}
	%>
</html>
<%@ 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>用户修改页面</title>
</head>
<body background="C:\Users\张强\Pictures\Saved Pictures/1505615532655.jpg">
	<%=request.getAttribute("error") %>
	<%=request.getAttribute("error1") %>
	 <form action="update.jsp" method="get">
		<table align="center" border="1" width="500">
		<h2  align="center">用户修改界面</h2>
			<tr>
				<td>用户名称 : </td>
				<td>
					<input type="text" name="username" />
				</td>
			</tr>
				<tr>
    			<td>新密码:</td>
    			<td>
    				<input type="password" name="password" />
    			</td>
    		</tr>
    		<tr>
    			<td>新昵称:</td>
    			<td>
    				<input type="text" name="nickname" />
    			</td>
    		</tr>
    		<tr align="center">
    			<td colspan="2">
    				<input type="submit" value="修改" />
    			</td>
    		</tr>
		</table>
	</form>
</body>
</html>
<%@ 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>
</head>
<body background="C:\Users\张强\Pictures\Saved Pictures/1505615532655.jpg">
	<%=request.getAttribute("error") %>
	 <form action="add.jsp" method="get">
		<table align="center" border="1" width="500">
		<h2  align="center">注册界面</h2>
			<tr>
				<td>用户名称 : </td>
				<td>
					<input type="text" name="username" />
				</td>
			</tr>
				<tr>
    			<td>用户密码:</td>
    			<td>
    				<input type="password" name="password" />
    			</td>
    		</tr>
    		<tr>
    			<td>用户昵称:</td>
    			<td>
    				<input type="text" name="nickname" />
    			</td>
    		</tr>
    		<tr align="center">
    			<td colspan="2">
    				<input type="submit" value="注册" />
    			</td>
    		</tr>
		</table>
	</form>
</body>
</html>

　　结果截图：

三.希望和目标：

当完成这门课程之后希望达到老师说的那样能独立完成一个系统，连接数据库并实现增删改查，并对数据库进行更多的操作，学习更多有关网页设计方面的知识，能让系统页面更加美观。并学习好如何设计一款安卓端软件，在寒假时争取为家人开发一款软件。我自觉自己在计算机方面的脑筋转的不太快，所以在软件工程概论这门课的学习中，希望能够跟上建民老师的进度，并在此基础上多学习一些其他知识，提高技术水平。

计划花费的时间：如果有空的话，每周都要有5天中花费时间在练习学过的代码，或者学习其他东西。

转载于:https://www.cnblogs.com/zhangliqiangvictory/p/7883805.html