JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版)_百度小程序

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项目布局：

JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版),第1张

JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版),第2张

Bean层：

AdminBean.java

对数据库里的用户名的表的数据进行封装。

package com.bean;
public class AdminBean {
	
	String admin;
    String password;
    String type;
	public String getAdmin() {
		return admin;
	}
	public void setAdmin(String admin) {
		this.admin = admin;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getType() {
		return type;
	}
	public void setType(String type) {
		this.type = type;
	}
    
}

StudentBean.java

对数据库里的学生信息的表的数据进行封装。

package com.bean;
public class StudentBean {
	
	private String sid;
	private String sname;
	private String scls;
	private String age;
	private String major;
	public String getSid() {
		return sid;
	}
	public void setSid(String sid) {
		this.sid = sid;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public String getScls() {
		return scls;
	}
	public void setScls(String scls) {
		this.scls = scls;
	}
	public String getAge() {
		return age;
	}
	public void setAge(String age) {
		this.age = age;
	}
	public String getMajor() {
		return major;
	}
	public void setMajor(String major) {
		this.major = major;
	}
}

dao层：

AdminDao.java

实现登录和注册的方法。

package com.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.bean.AdminBean;
import com.util.DBUtil;
public class AdminDao {
	
	//注册
	public static boolean register(String admin,String password,String type) {
		Connection conn = DBUtil.getConnectDb();
		String sql = "insert into auser (admin,password,type) values(?,?,?)";
		int a = 0;
		PreparedStatement stm = null; 
		boolean sta = false;
		try {
			stm = conn.prepareStatement(sql);
			stm.setString(1, admin);
			stm.setString(2, password);
			stm.setString(3, type);
			a = stm.executeUpdate();
			if(a == 0) {
				sta = false;
			}else {
				sta = true;
			}
			
			return sta;
			
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return false;
		}	
	}
	//登录
	public static AdminBean login(String admin,String password) {
		Connection conn = DBUtil.getConnectDb();
		String sql = "select * from auser where admin='"+admin+"' and password='"+password+"'";
		ResultSet rs;
		PreparedStatement stm = null; 
		AdminBean adimBean = new AdminBean();
		try {
			stm = conn.prepareStatement(sql);
			rs = stm.executeQuery();
			if(rs.next()) {
				adimBean.setAdmin(rs.getString("admin"));
				adimBean.setPassword(rs.getString("password"));
				adimBean.setType(rs.getString("type"));
			}
			
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return adimBean;
	}
	
}

StudentDao.java

对学生信息进行增加、删除（根据学生学号删除某一条信息+批量删除）、修改、查询（查询数据库中所有的学生信息+根据学生的学号查询某一条信息）

package com.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.bean.StudentBean;
import com.util.DBUtil;
public class StudentDao {
	// 添加
	public static boolean addStudent(String sid, String sname, String scls, String age, String major) {
		Connection conn = DBUtil.getConnectDb();
		String sql = "INSERT INTO stus VALUES(?,?,?,?,?)";
		int rs;
		PreparedStatement stm = null;
		try {
			stm = conn.prepareStatement(sql);
			stm.setString(1, sid);
			stm.setString(2, sname);
			stm.setString(3, scls);
			stm.setString(4, age);
			stm.setString(5, major);
			boolean a = false;
			rs = stm.executeUpdate();
			if (rs == 1) {
				return true;
			} else {
				return false;
			}
		} catch (SQLException e) {
			// TODO: handle exception
			e.printStackTrace();
			return false;
		}
	}
	// 更改
	public static boolean updateStudent(String sid, String sname, String scls, String age, String major) {
		Connection conn = DBUtil.getConnectDb();
		String sql = "UPDATE stus SET sname=?,scls=?,age=?,major=? WHERE sid=?";
		int rs;
		PreparedStatement stm = null;
		try {
			stm = conn.prepareStatement(sql);
			stm.setString(1, sname);
			stm.setString(2, scls);
			stm.setString(3, age);
			stm.setString(4, major);
			stm.setString(5, sid);
			boolean a = false;
			rs = stm.executeUpdate();
			if (rs == 1) {
				return true;
			} else {
				return false;
			}
		} catch (SQLException e) {
			// TODO: handle exception
			e.printStackTrace();
			return false;
		}
	}
	// 删除
	public static boolean deleteStudent(String sid) {
		Connection conn = DBUtil.getConnectDb();
		String sql = "DELETE FROM stus WHERE sid=?";
		int rs;
		PreparedStatement stm = null;
		try {
			stm = conn.prepareStatement(sql);
			stm.setString(1, sid);
			boolean a = false;
			rs = stm.executeUpdate();
			if (rs == 1) {
				return true;
			} else {
				return false;
			}
		} catch (SQLException e) {
			// TODO: handle exception
			e.printStackTrace();
			return false;
		}
	}
	// 查询所有信息
	public static List getList() {
		List studentArray = new ArrayList();
		// ArrayList studentArray = new ArrayList();
		Connection conn = DBUtil.getConnectDb();
		String sql = "SELECT * FROM stus";
		PreparedStatement stm = null;
		ResultSet rs = null;
		try {
			stm = conn.prepareStatement(sql);
			rs = stm.executeQuery();
			while (rs.next()) {
				StudentBean m = new StudentBean();
				m.setSid(rs.getString("sid"));
				m.setSname(rs.getString("sname"));
				m.setScls(rs.getString("scls"));
				m.setAge(rs.getString("age"));
				m.setMajor(rs.getString("major"));
				studentArray.add(m);
			}
			rs.close();
			stm.close();
			return studentArray;
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	// 根据学号查询单个学生信息
	public static ArrayList getList(String sid) {
		ArrayList studentArray = new ArrayList(); // 建立一个数组集合
		Connection conn = DBUtil.getConnectDb();
		String sql = "SELECT * FROM stus WHERE sid=?";
		PreparedStatement stm = null;
		ResultSet rs = null;
		try {
			stm = conn.prepareStatement(sql);
			stm.setString(1, sid);
			rs = stm.executeQuery();
			while (rs.next()) {
				StudentBean m = new StudentBean();
				m.setSid(rs.getString("sid"));
				m.setSname(rs.getString("sname"));
				m.setScls(rs.getString("scls"));
				m.setAge(rs.getString("age"));
				m.setMajor(rs.getString("major"));
				studentArray.add(m);
			}
			rs.close();
			stm.close();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return studentArray;
	}
	//批量删除
	public void piLiangDelete(String ids) {
		// TODO Auto-generated method stub
		Connection conn = DBUtil.getConnectDb();
		String sql = "DELETE FROM stus WHERE sid in ("+ids+")";
		PreparedStatement stm = null;
		try {
				stm = conn.prepareStatement(sql);
				stm.executeUpdate();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
}

Filter层：

LoginFilter.java

对该信息管理系统进行过滤，当没有登录的情况下是不能访问其他页面（包括增删改查+学生界面+教师界面），这样做相对来说比较安全。

package com.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@WebFilter("/*")
public class LoginFilter implements Filter {
	@Override
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException {
		// TODO Auto-generated method stub
		HttpServletRequest request = (HttpServletRequest)req;
		HttpServletResponse response = (HttpServletResponse)res;
		HttpSession session = request.getSession();
		
		String requestURI = request.getRequestURI();
		System.out.println(requestURI);
		if(requestURI.contains("/login.jsp")
				||requestURI.contains("/LoginServlet")
				||requestURI.contains("/LoginDelete")
				||requestURI.contains("/register.jsp")
				||requestURI.contains("/Login.css")
				||requestURI.contains("/Register.css")
				||requestURI.contains("/RegisterServlet")) {
			chain.doFilter(req, res);
			return;
		}
		
		if(session.getAttribute("username")!=null) {
			chain.doFilter(req, res);
		}else{
			response.sendRedirect("login.jsp");
		}
	}
}

Servlet层：

AddStudentServlet.java

添加学生信息。

package com.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 com.dao.StudentDao;
/**
 * Servlet implementation class AddStudentServlet
 */
@WebServlet("/AddStudentServlet")
public class AddStudentServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public AddStudentServlet() {
        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
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}
	/**
	 * @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");
		response.setContentType("text/html; charset=UTF-8");
		
		String id = request.getParameter("sid");
		String name = request.getParameter("sname");
		String cls = request.getParameter("scls");
		String age = request.getParameter("age");
		String major = request.getParameter("major");
		
		
		boolean a = StudentDao.addStudent(id, name, cls, age, major);
		if(a == true) {
			request.getSession().setAttribute("B2", "添加学生信息成功！");
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}else {
			
			request.getSession().setAttribute("B2", "添加失败，请检查学号！");
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}
		
	}
}

DeleteStudentServlet.java

根据学生学号sid对学生信息进行删除。

package com.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 com.dao.StudentDao;
/**
 * Servlet implementation class DeleteStudentServlet
 */
@WebServlet("/DeleteStudentServlet")
public class DeleteStudentServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public DeleteStudentServlet() {
        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");
		response.setContentType("text/html; charset=UTF-8");
		
		String id = request.getParameter("sid");
		System.out.println("id="+id);
		StudentDao studentDao = new StudentDao();
		boolean a;
		a = studentDao.deleteStudent(id);
		if(a == true) {
			request.getRequestDispatcher("SelectServlet1").forward(request, response);
		}
		
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}
}

LoginOut.java

销毁当前会话域中的所有属性,对用户进行注销，退出用户访问的界面，返回到登录界面。

package com.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;
/**
 * Servlet implementation class LoginOut
 */
@WebServlet("/LoginOut")
public class LoginOut extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginOut() {
        super();
        // TODO Auto-generated constructor stub
    }
	/**
	 * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		request.getSession().invalidate();
		
		response.sendRedirect("/StudentsMessageDemo/login.jsp");
	}
}

LoginServlet.java

用户的登录。

package com.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 com.bean.AdminBean;
import com.dao.AdminDao;
/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/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#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}
	/**
	 * @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");
		response.setContentType("text/html; charset=UTF-8");
		
		//获取注册信息
		String username = request.getParameter("u");
		String password = request.getParameter("p");
		String type = request.getParameter("type");
		 
		AdminDao dao = new AdminDao();
		
		try {
			AdminBean bean = dao.login(username, password);
			HttpSession session = request.getSession();
			session.setAttribute("username",username);
            String type1 = bean.getType();
            if(type1.equals(type)){
                if(type.equals("学生"))
                	response.sendRedirect("/StudentsMessageDemo/indexStu.jsp");
                if(type.equals("教师"))
                	response.sendRedirect("/StudentsMessageDemo/index.jsp");
            }
        } catch (Exception e) {
        	request.getSession().setAttribute("A2", "账号或密码错误请重新登录！");
			
			response.sendRedirect("/StudentsMessageDemo/login.jsp");
        }
    }
}

PiLiangDeleteServlet.java

批量删除学生信息（也可以进行全部删除和单条数据删除）。

package com.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 com.dao.StudentDao;
/**
 * Servlet implementation class PiLiangDeleteServlet
 */
@WebServlet("/PiLiangDeleteServlet")
public class PiLiangDeleteServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public PiLiangDeleteServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
	/**
	 * @param action 
	 * @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");
		response.setContentType("text/html; charset=UTF-8");
		String action = request.getParameter("action");
		if("deleteusers".equals(action)) {
			String sid = request.getParameter("sid");
			StudentDao studentDao = new StudentDao();
			studentDao.piLiangDelete(sid);
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}
}

RegisterServlet.java

注册用户信息。

package com.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 com.dao.AdminDao;
/**
 * Servlet implementation class RegisterServlet
 */
@WebServlet("/RegisterServlet")
public class RegisterServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public RegisterServlet() {
        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
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}
	/**
	 * @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");
		response.setContentType("text/html; charset=UTF-8");
		
		//获取注册信息
		String username = request.getParameter("u");
		String password = request.getParameter("p");
		String type = request.getParameter("type");
		
		boolean a = AdminDao.register(username, password,type);
		
		//将注册信息存入数据库，在返回登录
		
		if(a == true) {
			
			request.getSession().setAttribute("A1", "注册账号成功！");
			response.sendRedirect("/StudentsMessageDemo/register.jsp");
		}else {
			request.getSession().setAttribute("A1", "注册账号失败！");
			response.sendRedirect("/StudentsMessageDemo/register.jsp");
		}
		
	}
}

SelectServlet.java

学生界面显示的列表数据查询。

package com.servlet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.RequestDispatcher;
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 com.bean.StudentBean;
import com.dao.StudentDao;
/**
 * Servlet implementation class SelectServlet
 */
@WebServlet("/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#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doPost(request, response);
	}
	/**
	 * @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");
		response.setContentType("text/html; charset=UTF-8");
		List a = StudentDao.getList();
		request.setAttribute("studentArray", a);
		RequestDispatcher dispatcher = request.getRequestDispatcher("indexStu.jsp");
		dispatcher.forward(request, response);
	}
}

SelectServlet1.java

教师界面显示的列表数据查询。

package com.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.RequestDispatcher;
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 com.bean.StudentBean;
import com.dao.StudentDao;
/**
 * Servlet implementation class SelectServlet1
 */
@WebServlet("/SelectServlet1")
public class SelectServlet1 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SelectServlet1() {
        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
		doPost(request, response);
	}
	/**
	 * @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");
		response.setContentType("text/html; charset=UTF-8");
		List a = StudentDao.getList();
		request.setAttribute("studentArray", a);
		RequestDispatcher dispatcher = request.getRequestDispatcher("index.jsp");
		dispatcher.forward(request, response);
	}
}

SelectStudentServlet.java

教师界面查询按钮的实现（当文本框中有数据<学号>时，查询的时单条学生信息，当文本框数据为空时，查询的则是数据库中的所有数据）。

package com.servlet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.RequestDispatcher;
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 com.bean.StudentBean;
import com.dao.StudentDao;
/**
 * Servlet implementation class SelectStudentServlet
 */
@WebServlet("/SelectStudentServlet")
public class SelectStudentServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SelectStudentServlet() {
        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
		doPost(request, response);
	}
	/**
	 * @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");
		response.setContentType("text/html; charset=UTF-8");
		
		//获取注册信息
		String id = request.getParameter("sid");
		
		List a;
		if(id.equals("")) {
			a = StudentDao.getList();
		}else {
			a = StudentDao.getList(id);
			
		}
		request.setAttribute("studentArray", a);
		RequestDispatcher dispatcher = request.getRequestDispatcher("index.jsp");
		dispatcher.forward(request, response);
	}
}

SelectStudentServlet2.java

学生界面查询按钮的实现（当文本框中有数据<学号>时，查询的时单条学生信息，当文本框数据为空时，查询的则是数据库中的所有数据）。

package com.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.RequestDispatcher;
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 com.bean.StudentBean;
import com.dao.StudentDao;
/**
 * Servlet implementation class SelectStudentServlet2
 */
@WebServlet("/SelectStudentServlet2")
public class SelectStudentServlet2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SelectStudentServlet2() {
        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
		doPost(request, response);
	}
	/**
	 * @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");
		response.setContentType("text/html; charset=UTF-8");
		
		//获取注册信息
		String id = request.getParameter("sid");
		
		List a;
		if(id.equals("")) {
			a = StudentDao.getList();
		}else {
			a = StudentDao.getList(id);
			
		}
		request.setAttribute("studentArray", a);
		RequestDispatcher dispatcher = request.getRequestDispatcher("indexStu.jsp");
		dispatcher.forward(request, response);
	}
}

UpdateStudentServlet.java

修改时对丢改的数据进行回显（回显到修改页面）。

package com.servlet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
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 com.bean.StudentBean;
import com.dao.StudentDao;
/**
 * Servlet implementation class UpdateStudentServlet
 */
@WebServlet("/UpdateStudentServlet")
public class UpdateStudentServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public UpdateStudentServlet() {
        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");
		response.setContentType("text/html; charset=UTF-8");
		String sid = request.getParameter("sid");
		//System.out.println("id="+id);
		StudentDao studentDao = new StudentDao();
		ArrayList stu = studentDao.getList(sid);
		request.setAttribute("studentArray", stu);
		request.getRequestDispatcher("update.jsp").forward(request, response);
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
	}
}

UpdateStudentServlet1.java

对学生信息进行修改。

package com.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 com.dao.StudentDao;
/**
 * Servlet implementation class UpdateStudentServlet1
 */
@WebServlet("/UpdateStudentServlet1")
public class UpdateStudentServlet1 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public UpdateStudentServlet1() {
        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
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}
	/**
	 * @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");
		response.setContentType("text/html; charset=UTF-8");
		String id = request.getParameter("sid");
		String name = request.getParameter("sname");
		String cls = request.getParameter("scls");
		String age = request.getParameter("age");
		String major = request.getParameter("major");
		
		boolean a = StudentDao.updateStudent(id, name, cls, age, major);
		
		if(a == true) {
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}else {	
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}
	}
}

Util层：

DBUtil.java

连接MYSQL数据库。

package com.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBUtil {
	
	public static String url="jdbc:mysql://localhost:3306/students?serverTimezone=UTC&useSSL=true&characterEncoding=utf-8";
	public static String username="root";
	public static String password="1234";
	static {
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} 
		catch (Exception e) {
			System.out.println(e);
		}
	}
	public static Connection getConnectDb() {
		Connection conn = null;
		try {
			System.out.println("正在连接数据库....");
			conn=DriverManager.getConnection(url,username,password);
			System.out.println("连接成功");
		} 
		catch (SQLException  e) {
			System.out.println(e);
		}
		return conn;
	}
	
}

web.xml



  StudentsMessageDemo
  
    index.html
    index.jsp
    index.htm
    default.html
    default.jsp
    default.htm
  
  

	LoginFilter
	com.filter.LoginFilter


	LoginFilter
	/*

static文件夹：

登陆界面的css样式。

@charset "UTF-8";
html{   
    width: 100%;   
    height: 100%;   
    overflow: hidden;   
    font-style: sans-serif;   
}   
body{   
    width: 100%;   
    height: 100%;   
    font-family: 'Open Sans',sans-serif;   
    margin: 0;   
    background-color: #808069;   
}   
#login{   
    position: absolute;   
    top: 50%;   
    left:50%;   
    margin: -150px 0 0 -150px;   
    width: 300px;   
    height: 300px;   
}   
#login h1{   
    color: #fff;   
    text-shadow:0 0 10px;   
    letter-spacing: 1px;   
    text-align: center;   
}   
h1{   
    font-size: 2em;   
    margin: 0.67em 0;   
}   
input{   
    width: 278px;   
    height: 18px;   
    margin-bottom: 10px;   
    outline: none;   
    padding: 10px;   
    font-size: 13px;   
    color: #fff;   
    text-shadow:1px 1px 1px;   
    border-top: 1px solid #312E3D;   
    border-left: 1px solid #312E3D;   
    border-right: 1px solid #312E3D;   
    border-bottom: 1px solid #56536A;   
    border-radius: 4px;   
    background-color: #2D2D3F;   
}   
.but{   
    width: 300px;   
    min-height: 20px;   
    display: block;   
    background-color: #4a77d4;   
    border: 1px solid #3762bc;   
    color: #fff;   
    padding: 9px 14px;   
    font-size: 15px;   
    line-height: normal;   
    border-radius: 5px;   
    margin: 0;   
}

注册界面的css样式。

@charset "UTF-8";
html{   
    width: 100%;   
    height: 100%;   
    overflow: hidden;   
    font-style: sans-serif;   
}   
body{   
    width: 100%;   
    height: 100%;   
    font-family: 'Open Sans',sans-serif;   
    margin: 0;   
    background-color: #808A87;   
}   
#login{   
    position: absolute;   
    top: 50%;   
    left:50%;   
    margin: -150px 0 0 -150px;   
    width: 300px;   
    height: 300px;   
}   
#login h1{   
    color: #fff;   
    text-shadow:0 0 10px;   
    letter-spacing: 1px;   
    text-align: center;   
}   
h1{   
    font-size: 2em;   
    margin: 0.67em 0;   
}   
input{   
    width: 278px;   
    height: 18px;   
    margin-bottom: 10px;   
    outline: none;   
    padding: 10px;   
    font-size: 13px;   
    color: #fff;   
    text-shadow:1px 1px 1px;   
    border-top: 1px solid #312E3D;   
    border-left: 1px solid #312E3D;   
    border-right: 1px solid #312E3D;   
    border-bottom: 1px solid #56536A;   
    border-radius: 4px;   
    background-color: #2D2D3F;   
}   
.but{   
    width: 300px;   
    min-height: 20px;   
    display: block;   
    background-color: #4a77d4;   
    border: 1px solid #3762bc;   
    color: #fff;   
    padding: 9px 14px;   
    font-size: 15px;   
    line-height: normal;   
    border-radius: 5px;   
    margin: 0;   
}

JSP:

add.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>




增加操作


		
			
				
					 学号
					
						
					
				
				
					 姓名
					
						
					
				
				
					 班级
					
						
					
				
				
					 年龄
					
						
					
				
				
					 专业

index.jsp

教师访问的主界面。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ page import="com.bean.StudentBean" %>
    <%@ page import="java.util.*" %>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>




增删改查界面



	
		
			
				学生信息管理系统后台
				
		
	
	
		
			
		
		
		
			
				
					查找学生：
					
						
					
					
						
					
					
						添加信息
					
				
			
		
		
				你好！欢迎${username} 退出
		
	
	
	
		
			
						
						
							 
				
					
						
							
						
						
							学号
						
						
							姓名
						
						
							班级
						
						
							年龄
						
						
							专业
						
						
							操作
						
					
				
				
				
				
            				
							 	
							 		
							 	
								
								${stu.sid }
								
								
								${stu.sname }
								
								
								${stu.scls }
								
								
								${stu.age }
								
								
								${stu.major }
								
								
								修改 删除

	学号	姓名	班级	年龄	专业	操作
	${stu.sid }	${stu.sname }	${stu.scls }	${stu.age }	${stu.major }	修改删除

indexStu.jsp

学生访问的主界面。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ page import="com.bean.StudentBean" %>
    <%@ page import="java.util.*" %>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>




学生信息管理系统


	
		
			
				学生信息管理系统
			
			
				
				
				
					
						
							 个人查找：
							
								
							
							
								 
							
						
					
				
				
					你好！欢迎${username} 退出
				
			
			
		
		
				
					
						
						
							 
						
							
								
									学号
								
								
									姓名
								
								
									班级
								
								
									年龄
								
								
									专业
								
							
						
						
						
            				
								
								${stu.sid }
								
								
								${stu.sname }
								
								
								${stu.scls }
								
								
								${stu.age }
								
								
								${stu.major }

学号	姓名	班级	年龄	专业
${stu.sid }	${stu.sname }	${stu.scls }	${stu.age }	${stu.major }

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>




登陆界面
 


	  
        学生信息管理系统  
          
              
             
            用户类型：
             
              
            
            没有账号请
            注册
            
            
            

            
            	<%
            	String state = (String) session.getAttribute("A2");
            	session.removeAttribute("A2");
            	if(state != null){
            		out.print(state);
            	}
            	%>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>




注册界面



	  
        注册  
          
              
            
            用户类型：
               
              
            
            返回
            登录界面
            
            

            
            	<%
            	String state = (String) session.getAttribute("A1");
            	session.removeAttribute("A1");
            	if(state != null){
            		out.print(state);
            	}
            	%>

update.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>




修改操作


		
			
			
						
						
            				
				
				
					 姓名
					
						
					
				
				
					 班级
					
						
					
				
				
					 年龄
					
						
					
				
				
					 专业

最终效果图：

登录界面：

JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版),第3张

注册界面：

JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版),第4张

学生界面：

JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版),第5张

教师界面（前面的复选框可进行批量删除）：

JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版),第6张

修改界面（没有显示学号是因为对学号进行了隐藏）：

JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版),第7张

添加页面：

JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版),第8张数据库：

JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版),第9张

JAVAWEB学生信息管理系统保姆级教程(增删改查+＜普通用户和管理员＞登录注册+Filter+mysql+批量删除信息+用户退出登录注销)eclipse版(升级版),第10张

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