java 论文参考文献 javaweb参考文献

项目背景

学生信息管理是学校的重要工作之一。传统的学生信息管理由于是手工操作，工作量大且容易出错。随着计算机和网络技术的迅速发展，越来越多的院校都拥有了自己的学生信息管理系统，而采用B/S架构的学生信息管理系统进行学生信息的管理则是其趋势。
Java web技术的基础就是核心Java平台，它有许多优点，例如：“编写一次、随处运行”的特性、方便存取数据库的JDBC API技术以及能够在Internet应用中保护数据的安全模式等等。J2EE体系结构提供中间层集成框架用来满足高可用性、高可靠性以及可扩展性的应用需求，为搭建具有可伸缩性、灵活性、易维护性的网络应用系统提供了良好的机制。
本文基于Java web平台技术、采用Browser/Server结构,设计并实现了该系统的简化版学生信息管理系统。
论文首先介绍了系统开发涉及的相关技术及开发平台，主要围绕学生信息管理系统实现的相关技术和系统的体系结构，介绍了学生信息管理系统的总体分析与设计，包括需求分析、功能模块分析和数据库设计。最后，利用Jsp+Servlet+JavaBean模式对简单学生信息管理子系统进行了实现，并作了详细描述，主要采用图片与代码结合的方式详细地叙述了系统功能的实现。
关键词： 学生信息管理系统，Java web，Servlet，JSP

功能设计

功能模块图

系统结构图

用户登录流程图

程序流程图

功能截图

相关代码

1public class LoginServlet extends HttpServlet {
2	private static final long serialVersionUID = 1L;
3	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
4		request.setCharacterEncoding("utf-8");
5		String username = request.getParameter("username");
6		String password = request.getParameter("password");
7		String level = null;
8		//实例化UserDao对象
9		UserDao userDao = new UserDao();
10		User user = userDao.login(username, password);
11		//判断是否登录成功
12		if(user != null){//成功
13			level = user.getLevel();
14			if(level.equals("用户")){
15				request.getSession().setAttribute("user", user);//将用户对象放到session中
16				//转发到user.jsp中
17				request.getRequestDispatcher("user.jsp").forward(request, response);
18			}
19			else{
20			request.getSession().setAttribute("admin", user);//将管理员对象放到session中
21				//转发到admin.jsp中
22				request.getRequestDispatcher("admin.jsp").forward(request, response);
23			}	
24		}else {//失败
25			request.setAttribute("info"," 错误:用户名或密码错误！");
26			request.getRequestDispatcher("message.jsp").forward(request, response);
27		}
28	}
}

1public class CourseDao {
2	// 获取所有课程的信息，用ArrayList返回
3	public ArrayList<Course> query_all_course() {
4		Connection conn = DBUtils.getConnection();
5		String sql = "select * from course order by cno;";
6		ArrayList<Course> results = new ArrayList<Course>();
7		try {
8			PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
9			ResultSet rs = ps.executeQuery();
10			while (rs.next()) {
11				Course temp = new Course();
12				temp.setCno(rs.getString("Cno"));
13				temp.setCname(rs.getString("Cname"));
14				temp.setCteacher(rs.getString("Cteacher"));
15				temp.setCcredit(rs.getInt("Ccredit"));
16				results.add(temp);
17			}
18			// 关闭资源
19			rs.close();
20			ps.close();
21		} catch (SQLException e) {
22			e.printStackTrace();
23		} finally {
24			DBUtils.closeConnection(conn);
25		}
26		return results;
27	}
28	// 插入课程信息，返回一个int值表示状态,1：成功，0失败
29	public int insert_course(String Cno, String Cname, String Cteacher, double Ccredit) {
30		Connection conn = DBUtils.getConnection();
31		String sql = "insert into course values(?,?,?,?);";
32		int flag = 0;
33		try {
34			PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
35			ps.setString(1, Cno);
36			ps.setString(2, Cname);
37			ps.setString(3, Cteacher);
38			ps.setDouble(4, Ccredit);
39			flag = ps.executeUpdate();
40			ps.close();
41		} catch (SQLException e) {
42			e.printStackTrace();
43		} finally {
44			DBUtils.closeConnection(conn);
45		}
46		return flag;
47	}
48	// 删除课程信息，返回一个int值表示状态,1：成功，0失败
49	public int delete_course(String Cno) {
50		Connection conn = DBUtils.getConnection();
51		String sql = "delete from course where Cno = ?;";
52		int flag = 0;
53		try {
54			PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
55			ps.setString(1, Cno);
56			flag = ps.executeUpdate();
57			ps.close();
58		} catch (SQLException e) {
59			e.printStackTrace();
60		} finally {
61			DBUtils.closeConnection(conn);
62		}
63		return flag;
64	}
65	//修改课程信息，返回一个int值表示状态,1：成功，0失败
66	public int alter_course(String cno,String after_cno,String after_cname,String after_cteacher,double after_ccredit) {
67		Connection conn = DBUtils.getConnection();
68		String sql = "update course set cno = ?,cname = ?,cteacher = ?,ccredit = ? where cno = ?;";
69		int flag = 0;
70		try {
71			PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
72			ps.setString(1, after_cno);
73			ps.setString(2, after_cname);
74			ps.setString(3, after_cteacher);
75			ps.setDouble(4, after_ccredit);
76			ps.setString(5, cno);
77			flag = ps.executeUpdate();
78			ps.close();
79		} catch (SQLException e) {
80			e.printStackTrace();
81		}finally {
82			DBUtils.closeConnection(conn);
83		}
84		return flag;
85	}
86	// 查询课程平均分信息，返回一个ArrayLst集合
87	public ArrayList<Course_avg> course_avg() {
88		Connection conn = DBUtils.getConnection();
89		String sql = "select sc.cno cno,cname,avg(grade) avg from course,sc where course.cno = sc.cno group by cno order by cno;";
90		ResultSet result = null;
91		ArrayList<Course_avg> course_avg = new ArrayList<Course_avg>();
92		try {
93			PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
94			result = ps.executeQuery();
95			while(result.next()){
96				Course_avg temp = new Course_avg();
97				temp.setCno(result.getString("Cno"));
98				temp.setCname(result.getString("Cname"));
99				temp.setAvg(result.getDouble("avg"));
100				course_avg.add(temp);
101			}
102			ps.close();
103			result.close();
104		} catch (SQLException e) {
105			e.printStackTrace();
106		} finally {
107			DBUtils.closeConnection(conn);
108		}
109		return course_avg;
110	}
111	//查询课程不及格率，返回一个ArrayList集合
112	public ArrayList<Course_fail_rate> fail_rate(){
113		Connection conn = DBUtils.getConnection();
114		String sql = "select cno,(select cname from course where cno = x.cno) cname,cast(100.0*(select count(sno) from sc where grade < 60 and cno = x.cno)/(select count(sno) from sc where cno = x.cno) as decimal(18,2)) rate from sc x group by cno order by cno;";
115		ArrayList<Course_fail_rate> fail_rate = new ArrayList<Course_fail_rate>();
116		try {
117			PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
118			ResultSet rs = ps.executeQuery();
119			while(rs.next()){
120				Course_fail_rate temp = new Course_fail_rate();
121				temp.setCno(rs.getString("cno"));
122				temp.setCname(rs.getString("cname"));
123				temp.setFail_rate(rs.getDouble("rate"));
124				fail_rate.add(temp);
125			}
126			rs.close();
127			ps.close();
128		} catch (SQLException e) {
129			e.printStackTrace();
130		} finally {
131			DBUtils.closeConnection(conn);
132		}
133		return fail_rate;
134	}
135	//查询课程排名情况,返回一个ArrayList集合
136	public ArrayList<Course_ranking> course_ranking(String cno){
137		Connection conn = DBUtils.getConnection();
138		String sql = "select student.Sno Sno,Dname,Clname,Sname,Ssex,Sage,Grade from department,class,student,sc where student.sno = sc.sno and class.Clno = student.Clno and department.Dno = class.Dno and cno = '"+cno+"' order by grade desc;";
139		ArrayList<Course_ranking> course_ranking = new ArrayList<Course_ranking>();
140		try {
141			PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
142			ResultSet rs = ps.executeQuery();
143			while(rs.next()){
144				Course_ranking temp = new Course_ranking();
145				temp.setSno(rs.getString("Sno"));
146				temp.setDname(rs.getString("Dname"));
147				temp.setClname(rs.getString("Clname"));
148				temp.setSname(rs.getString("Sname"));
149				temp.setSsex(rs.getString("Ssex"));
150				temp.setSage(rs.getInt("Sage"));
151				temp.setGrade(rs.getDouble("Grade"));
152				course_ranking.add(temp);
153			}
154			rs.close();
155			ps.close();
156		} catch (SQLException e) {
157			e.printStackTrace();
158		} finally {
159			DBUtils.closeConnection(conn);
160		}
161		return course_ranking;
162	}
}