（一）功能介绍
1.用户输入正确的密码进行登录
2.新用户可以进行注册
3.登录后显示学生的信息表
4.可以添加学生
5.可以修改学生已有信息
6.可以删除已有学生
7.可以显示登录的用户学号（每个页面都可以通过调用session显示）
8.可以记录浏览量
（二）页面展示
登录页面
注册页面
学生信息页面
添加页面
添加之后的学生信息表
修改页面
修改之后的学生信息表
删除之后的学生信息表
（三）项目代码
package entity;public class Student { private String sno; private String password; private String name; public Student(String sno, String password, String name) { this.sno = sno; this.password = password; this.name = name; } public String getSno() { return sno; } public void setSno(String sno) { this.sno = sno; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getName() { return name; } public void setName(String name) { this.name = name; }}
package util;import entity.Student;import java.util.HashMap;public class StudentUtil { public static HashMap map=new HashMap(); static{ map.put("101",new Student("101","123","lili")); map.put("102",new Student("102","123","lisa")); map.put("103",new Student("103","123","coco")); map.put("104",new Student("104","123","mark")); } public static boolean log(Student stu){ boolean b=false; for(String s:map.keySet()){ if(map.get(s).getSno().equals(stu.getSno())&&map.get(s).getPassword().equals(stu.getPassword())){ b=true; } } return b; } public static boolean reg(Student stu){ map.put(stu.getSno(),stu); return true; }}
package servlet;import entity.Student;import org.omg.CORBA.Request;import util.StudentUtil;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 java.io.IOException;@WebServlet("/LoginServlet")public class LoginServlet extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String sno=req.getParameter("sno"); String password=req.getParameter("password"); Student s=new Student(sno,password,null); boolean b=StudentUtil.log(s); if(b==true){ ServletContext a=this.getServletContext(); Object o=a.getAttribute("count"); if(o==null){ a.setAttribute("count",1); }else{ int count=Integer.parseInt(o.toString()); a.setAttribute("count",count+1); } HttpSession se=req.getSession(); se.setAttribute("sno",sno); req.setAttribute("sno",sno); req.getRequestDispatcher("student.jsp").forward(req,resp); }else{ req.getRequestDispatcher("error.jsp").forward(req,resp); } } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } }
package servlet;import entity.Student;import util.StudentUtil;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 java.io.IOException;@WebServlet("/RegisterServlet")public class RegisterServlet extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String sno=req.getParameter("sno"); String password=req.getParameter("password"); String name=req.getParameter("name"); StudentUtil.reg(new Student(sno,password,name)); req.getRequestDispatcher("/index.jsp").forward(req,resp); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); }}
package servlet;import entity.Student;import util.StudentUtil;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 java.io.IOException;@WebServlet("/InsertServlet")public class InsertServlet extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String sno=req.getParameter("sno"); String password=req.getParameter("password"); String name=req.getParameter("name"); StudentUtil.map.put(sno,new Student(sno,password,name)); req.getRequestDispatcher("student.jsp").forward(req,resp); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); }}
package servlet;import util.StudentUtil;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 java.io.IOException;@WebServlet("/UpdateServlet")public class UpdateServlet extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String sno=req.getParameter("sno"); String password=req.getParameter("password"); String name=req.getParameter("name"); StudentUtil.map.get(sno).setName(name); StudentUtil.map.get(sno).setPassword(password); req.getRequestDispatcher("student.jsp").forward(req,resp); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); }}package servlet;import util.StudentUtil;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 java.io.IOException;@WebServlet("/DeleteServlet")public class DeleteServlet extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String sno= req.getParameter("sno"); StudentUtil.map.remove(sno); req.getRequestDispatcher("student.jsp").forward(req,resp); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); }}
index.jsp
Title 登录 学号： 密码： 注册
register.jsp
Title 学号： 密码： 姓名： student.jsp Title增加 用户： 浏览量： 学号 密码 姓名 修改 删除error.jsp Title账户名或密码错误返回登录
insert.jsp
Title 学号： 密码： 姓名：
update.jsp
Title 学号 密码 姓名