Bootstrap

JavaWeb实现 学生体质信息管理系统 JSP+JavaBean+servlet+JDBC+DAO

运行截图：

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文件结构：

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代码如下

bean包

public class StudentInfo {
	private Integer id;
	private String name, sex;
	private Integer age;
	private Float weight, height;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public Float getWeight() {
		return weight;
	}

	public void setWeight(Float weight) {
		this.weight = weight;
	}

	public Float getHeight() {
		return height;
	}

	public void setHeight(Float height) {
		this.height = height;
	}

}

public class Users {
	private String username, userpwd, usertype;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getUserpwd() {
		return userpwd;
	}

	public void setUserpwd(String userpwd) {
		this.userpwd = userpwd;
	}

	public String getUsertype() {
		return usertype;
	}

	public void setUsertype(String usertype) {
		this.usertype = usertype;
	}

}

DAO包

public class StudentDao {
	public int add(StudentInfo user) throws Exception {
		Connection conn = null;
		PreparedStatement pst = null;
		try {
			conn = JdbcUtil.getConnection();
			String sql = "insert into stu_info values(?,?,?,?,?,?)";
			;
			pst = conn.prepareStatement(sql);
			pst.setInt(1, user.getId());
			pst.setString(2, user.getName());
			pst.setString(3, user.getSex());
			pst.setInt(4, user.getAge());
			pst.setFloat(5, user.getWeight());
			pst.setFloat(6, user.getWeight());
			int n = pst.executeUpdate();
			return n;
		} finally {
			JdbcUtil.free(null, pst, conn);
		}
	}

	public int update(StudentInfo user) throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		try {
			conn = JdbcUtil.getConnection();
			String sql = "update stu_info set id=?,name=?,sex=?,age=?,weight=?,height=? where id=? ";
			ps = conn.prepareStatement(sql);
			ps.setInt(1, user.getId());
			ps.setString(2, user.getName());
			ps.setString(3, user.getSex());
			ps.setInt(4, user.getAge());
			ps.setFloat(5, user.getWeight());
			ps.setFloat(6, user.getHeight());
			ps.setInt(7, user.getId());
			int n = ps.executeUpdate();
			return n;
		} finally {
			JdbcUtil.free(null, ps, conn);
		}

	}

	public StudentInfo findUserById(StudentInfo sInfo) throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		ResultSet rs = null;
		StudentInfo sInfo2 = new StudentInfo();
		try {
			conn = JdbcUtil.getConnection();
			String sql = "select * from stu_info where id=? ";
			ps = conn.prepareStatement(sql);
			ps.setInt(1, sInfo.getId());
			rs = ps.executeQuery();
			while (rs.next()) {
				sInfo2.setId(rs.getInt(1));
				sInfo2.setName(rs.getString(2));
				sInfo2.setSex(rs.getString(3));
				sInfo2.setAge(rs.getInt(4));
				sInfo2.setHeight(rs.getFloat(5));
				sInfo2.setWeight(rs.getFloat(6));
			}
			return sInfo2;
		} finally {
			JdbcUtil.free(null, null, null);
		}

	}

	public List<StudentInfo> findUserById2(String sql1) throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		ResultSet rs = null;
		List<StudentInfo> list = new ArrayList<StudentInfo>();
		try {
			conn = JdbcUtil.getConnection();
			String sql = "select * from stu_info where 1=1" + sql1;
			ps = conn.prepareStatement(sql);
			rs = ps.executeQuery();
			while (rs.next()) {
				StudentInfo sInfo2 = new StudentInfo();
				sInfo2.setId(rs.getInt(1));
				sInfo2.setName(rs.getString(2));
				sInfo2.setSex(rs.getString(3));
				sInfo2.setAge(rs.getInt(4));
				sInfo2.setHeight(rs.getFloat(5));
				sInfo2.setWeight(rs.getFloat(6));
				list.add(sInfo2);
			}
			return list;

		} finally {
			JdbcUtil.free(null, ps, conn);
		}

	}

	public int deleteById(StudentInfo name) throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		try {
			conn = JdbcUtil.getConnection();
			String sql = "delete from stu_info where name like '%" + name.getName() + "%'";
			ps = conn.prepareStatement(sql);
			int n = ps.executeUpdate();
			return n;
		} finally {
			JdbcUtil.free(null, ps, conn);
		}
	}

}

package Dao;

import dbc.JdbcUtil;
import java.sql.*;

import bean.Users;

public class UsersDao {
	public int add(Users user) throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		try {
			conn = JdbcUtil.getConnection();
			String sql = "insert into users  values (?,?,?) ";
			ps = conn.prepareStatement(sql);
			ps.setString(1, user.getUsername());
			ps.setString(2, user.getUserpwd());
			ps.setString(3, user.getUsertype());
			int n = ps.executeUpdate();
			return n;
		} finally {
			JdbcUtil.free(null, ps, conn);
		}
	}

	public int update(String a, String b) throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		int n = 0;
		try {
			conn = JdbcUtil.getConnection();
			String sql = "update users set userpwd=? where username=? ";
			ps = conn.prepareStatement(sql);
			ps.setString(1, a);
			ps.setString(2, b);
			ps.executeUpdate();
			n++;
		} finally {
			JdbcUtil.free(null, ps, conn);
		}
		return n;
	}

	public int deleteById(String userId) throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		try {
			conn = JdbcUtil.getConnection();
			String sql = "delete from user where userid=?";
			ps = conn.prepareStatement(sql);
			ps.setString(1, userId);
			int n = ps.executeUpdate();
			return n;
		} finally {
			JdbcUtil.free(null, ps, conn);
		}
	}

	public int findUserById(Users users) throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		ResultSet rs = null;
		int n = 0;
		try {
			conn = JdbcUtil.getConnection();
			String sql = "select * from users where username=? and userpwd=? and usertype=? ";
			ps = conn.prepareStatement(sql);
			ps.setString(1, users.getUsername());
			ps.setString(2, users.getUserpwd());
			ps.setString(3, users.getUsertype());
			rs = ps.executeQuery();
			if (rs.next()) {
				n = 1;
			}
			return n;
		} finally {
			JdbcUtil.free(rs, ps, conn);
		}

	}

}

jdbc包

package jdbc;

import java.sql.*;
import java.util.Properties;

public class JdbcUtil {

	private static String driver;
	private static String url;
	private static String user;
	private static String password;
	private static Properties pr = new Properties();
	// 设计该工具类的静态初始化器中的代码，该代码在装入类时执行，且只执行一次
	static {
		try {
			pr.load(JdbcUtil.class.getClassLoader().getResourceAsStream("db.properties"));
			driver = pr.getProperty("driver");
			url = pr.getProperty("url");
			user = pr.getProperty("user");
			password = pr.getProperty("password");
			Class.forName(driver);
		} catch (Exception e) {
			throw new ExceptionInInitializerError(e);
		}
	}

	// 设计获得连接对象的方法getConnection()
	public static Connection getConnection() throws SQLException {
		return DriverManager.getConnection(url, user, password);
	}

	// 设计释放结果集、语句和连接的方法free()
	public static void free(ResultSet rs, Statement st, Connection conn) {
		try {
			if (rs != null)
				rs.close();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if (st != null)
					st.close();
			} catch (SQLException e) {
				e.printStackTrace();
			} finally {
				if (conn != null)
					try {
						conn.close();
					} catch (SQLException e) {
						e.printStackTrace();
					}
			}
		}
	}
}

servlet包

package servlet;

import java.io.IOException;
import Dao.*;
import bean.*;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class AddServlet
 */
@WebServlet("/shuju/AddServlet")
public class AddServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public AddServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		int n = 0;
		int id = Integer.parseInt(request.getParameter("id"));
		String name = request.getParameter("name");
		String sex = request.getParameter("sex");
		int age = Integer.parseInt(request.getParameter("age"));
		float weight = Float.parseFloat(request.getParameter("weight"));
		float height = Float.parseFloat(request.getParameter("height"));
		StudentInfo student = new StudentInfo();
		student.setId(id);
		student.setName(name);
		student.setSex(sex);
		student.setAge(age);
		student.setWeight(weight);
		student.setHeight(height);
		StudentDao studentDao = new StudentDao();
		try {
			n = studentDao.add(student);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if (n == 1) {
			request.setAttribute("result", "添加数据成功");
		} else {
			request.setAttribute("result", "数据添加失败");
		}
		request.getRequestDispatcher("shujuadd_process.jsp").forward(request, response);
	}

}


package servlet;

import java.io.IOException;
import Dao.*;
import bean.*;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class DeleteServlet
 */
@WebServlet("/shuju/DeleteServlet")
public class DeleteServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public DeleteServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("utf-8");
		int n = 0;
		String name = request.getParameter("name");
		StudentInfo a = new StudentInfo();
		a.setName(name);
		StudentDao studentDao = new StudentDao();
		try {
			n = studentDao.deleteById(a);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if (n == 1) {
			request.setAttribute("result", "删除数据成功");
		} else {
			request.setAttribute("result", "删除数据失败");
		}
		request.getRequestDispatcher("shujudelete_process.jsp").forward(request, response);
	}

}


package servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import Dao.*;
import bean.*;

/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/shuju/LoginServlet")
public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public LoginServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("utf-8");
		HttpSession session = request.getSession();
		String username = request.getParameter("username");
		String userpwd = request.getParameter("userpwd");
		String usertype = request.getParameter("usertype");
		session.setAttribute("login", username);
		int n = 0;
		Users users = new Users();
		users.setUsername(username);
		users.setUserpwd(userpwd);
		users.setUsertype(usertype);
		UsersDao usersDao = new UsersDao();

		try {
			n = usersDao.findUserById(users);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if (n == 1) {
			request.setAttribute("outvalue", "登陆成功！！");
			response.setHeader("refresh", "1;shujuadd_input.jsp");
		} else {
			request.setAttribute("outvalue", "登陆失败");
			response.setHeader("refresh", "1;login.jsp");
		}

		request.getRequestDispatcher("show.jsp").forward(request, response);

	}
}


package servlet;

import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import Dao.UsersDao;

/**
 * Servlet implementation class Password
 */
@WebServlet("/shuju/Password")
public class Password extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public Password() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("utf-8");
		HttpSession session = request.getSession();
		String oldpwd = request.getParameter("oldpwd");
		String newpwd = request.getParameter("newpwd");
		String renewpwd = request.getParameter("renewpwd");
		String username = (String) session.getAttribute("login");
		String userpwd = (String) session.getAttribute("pwd");
		// 判断新密码与确认密码一致
		if (newpwd != renewpwd) {
			request.setAttribute("result", "输入密码与确认新密码不一致");
			response.setHeader("refresh", "1;passwordmodi_input.jsp");
		}
		// 判断登陆密码与旧密码是否一致
		if (userpwd != oldpwd) {
			request.setAttribute("result", "旧密码不正确");
			response.setHeader("refresh", "1;passwordmodi_input.jsp");
		}
		UsersDao usersDao = new UsersDao();
		int i = 0;
		try {
			i = usersDao.update(newpwd, username);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if (i >= 1) {
			request.setAttribute("result", "密码已更新！！请重新登陆！！");
			session.removeAttribute("login");
		} else {
			request.setAttribute("result", "密码更新错误！");
		}
		request.getRequestDispatcher("passwordmodi_process.jsp").forward(request, response);
	}
}


package servlet;

import java.io.IOException;
import Dao.*;
import bean.*;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Regist
 */
@WebServlet("/shuju/Regist")
public class Regist extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public Regist() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("utf-8");
		String username = request.getParameter("username");
		String userpwd = request.getParameter("userpwd");
		String usertype = request.getParameter("usertype");
		int i = 0;
		Users users = new Users();
		users.setUsername(username);
		users.setUserpwd(userpwd);
		users.setUsertype(usertype);
		UsersDao usersDao = new UsersDao();
		try {
			i = usersDao.add(users);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if (i >= 1) {
			request.setAttribute("result", "注册成功，将转入登陆页面");
			response.setHeader("refresh", "1;login.jsp");
		} else {
			request.setAttribute("result", "注册失败请重新注册");
			response.setHeader("refresh", "1;regist_input.jsp");
		}
		request.getRequestDispatcher("regist_process.jsp").forward(request, response);
	}

}


package servlet;

import java.io.IOException;
import java.util.*;
import Dao.*;
import bean.*;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class SelectServlet
 */
@WebServlet("/shuju/SelectServlet")
public class SelectServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public SelectServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("utf-8");
		List<StudentInfo> studentInfos = new ArrayList<StudentInfo>();
		StudentDao sDao = new StudentDao();
		String sql = "";
		int id;
		String name;
		float weight1;
		float weight2;
		if (!request.getParameter("id").equals("")) {
			id = Integer.parseInt(request.getParameter("id"));
			sql = sql + " and id=" + id;
		}
		if (!request.getParameter("name").equals("")) {
			name = request.getParameter("name");
			sql = sql + " and name='" + name + "'";
		}
		if ((request.getParameter("weight1") != "") && (request.getParameter("weight2") != "")) {
			weight1 = Float.parseFloat(request.getParameter("weight1"));
			weight2 = Float.parseFloat(request.getParameter("weight2"));
			sql = sql + " and weight between " + weight1 + " and " + weight2;
		}
		try {
			studentInfos = sDao.findUserById2(sql);

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		request.setAttribute("info", studentInfos);
		request.getRequestDispatcher("shujuselect_process.jsp").forward(request, response);
	}

}


package servlet;

import java.io.IOException;

import Dao.*;
import bean.*;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class UpdateServlet
 */
@WebServlet("/shuju/UpdateServlet1")
public class UpdateServlet1 extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public UpdateServlet1() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("utf-8");
		int idselect = Integer.parseInt(request.getParameter("id"));
		HttpSession session = request.getSession();
		session.setAttribute("id", idselect);
		StudentInfo studentInfo = new StudentInfo();
		StudentInfo studentInfo2 = new StudentInfo();
		StudentDao studentDao = new StudentDao();
		studentInfo.setId(idselect);
		try {
			studentInfo2 = studentDao.findUserById(studentInfo);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		request.setAttribute("info", studentInfo2);
		request.getRequestDispatcher("shujuupdate_process.jsp").forward(request, response);

	}

}


package servlet;

import java.io.IOException;
import Dao.*;
import bean.*;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class UpdateServlet2
 */
@WebServlet("/shuju/UpdateServlet2")
public class UpdateServlet2 extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public UpdateServlet2() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		int n = 0;
		int id = Integer.parseInt(request.getParameter("id"));
		String name = request.getParameter("name");
		String sex = request.getParameter("sex");
		int age = Integer.parseInt(request.getParameter("age"));
		float weight = Float.parseFloat(request.getParameter("weight"));
		float height = Float.parseFloat(request.getParameter("height"));
		StudentInfo studet = new StudentInfo();
		studet.setId(id);
		studet.setName(name);
		studet.setSex(sex);
		studet.setAge(age);
		studet.setWeight(weight);
		studet.setHeight(height);
		StudentDao studentDao = new StudentDao();

		try {
			n = studentDao.update(studet);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if (n >= 1) {
			request.setAttribute("result", "数据重写成功");
		} else {
			request.setAttribute("result", "数据重写失败");
		}
		request.getRequestDispatcher("shujuupdate_process_edit.jsp").forward(request, response);
	}

}

jsp页面部分（由于代码比较多，这里省略部分代码）：

主页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
#left {
	float: left;
	width: 29%;
	height: 600px;
}

#right {
	margin-left: 2px;
	float: left;
	width: 69%;
	height: 600px;
}

iframe {
	height: 600px;
	width: 100%;
}
</style>
</head>
<body>
	<div id="left">
		<iframe src="left.jsp" name="left"></iframe>
	</div>
	<div id="right">
		<iframe src="#" name="right"></iframe>
	</div>
</body>
</html>

左侧任务栏表：

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
a {
	text-decoration: none;
}

a:hover {
	text-decoration: underline;
}
</style>
</head>
<body>
	<a href="login.jsp" target="right">登陆</a>
	<br />
	<a href="passwordmodi_input.jsp" target="right">密码修改</a>
	<br />
	<a href="#" target="right">数据操作</a>
	<br /> &nbsp;&nbsp;&nbsp;&nbsp;
	<a href="shujuadd_input.jsp" target="right">数据添加</a>
	<br /> &nbsp;&nbsp;&nbsp;&nbsp;
	<a href="shujudelete_input.jsp" target="right">数据删除</a>
	<br /> &nbsp;&nbsp;&nbsp;&nbsp;
	<a href="shujuselect_input.jsp" target="right">数据查询</a>
	<br /> &nbsp;&nbsp;&nbsp;&nbsp;
	<a href="shujuupdate_input.jsp" target="right">数据修改</a>
	<br />
	<a href="exit.jsp" target="right">退出</a>
	<br />
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%
		if (session.getAttribute("login") == null) {
			out.print("你从来没有登陆过,请先登陆后才能点击退出");
			response.setHeader("refresh", "3;url='login.jsp'");
		} else {
			session.removeAttribute("login");
			out.print("你的登陆session已经删除！！");
		}
	%>
</body>
</html>

悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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