学生管理servlet | 易学教程

目录结构如下：

edu.lishan.bean>>

　　　　　　　　Student.java
edu.lishan.servlet>>

　　　　　　　　LoginServlet.java
edu.lishan.util>>

　　　　　　　　DbConnect.java
WebRoot>>

　　　　　　　　index.jsp
　　　　　　　　loginAction.jsp
　　　　　　　　stuAdd.jsp

Student.java

package edu.lishan.bean;

public class Student {
    private int id;
    private String name;
    private String sex;
    private String specialty;
    private String grade;
    public int getId() {
        return id;
    }
    public void setId(int 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 String getSpecialty() {
        return specialty;
    }
    public void setSpecialty(String specialty) {
        this.specialty = specialty;
    }
    public String getGrade() {
        return grade;
    }
    public void setGrade(String grade) {
        this.grade = grade;
    }
    

}

LoginServlet.java

package edu.lishan.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

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 edu.lishan.util.DbConnect;

@WebServlet(urlPatterns="/loginServer")
public class LoginServlet extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // TODO Auto-generated method stub
        this.doPost(req, resp);
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException{
        resp.setContentType("text/html;charset=utf-8");
        req.setCharacterEncoding("utf-8");
        PrintWriter out = resp.getWriter();
        String admin = req.getParameter("admin");
        String pwd = req.getParameter("pwd");
        if(admin.equals("admin")&& pwd.equals("123")){
            Connection conn = DbConnect.getConnection();
            String sql = "select * from student";
            PreparedStatement psmt = null;
            ResultSet rs = null;
            try {
                psmt = conn.prepareStatement(sql);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
                 rs = psmt.executeQuery();
                 HttpSession session = req.getSession();
                 session.setMaxInactiveInterval(7200);
                 session.setAttribute("rs", rs);
                 
                 resp.sendRedirect("loginAction.jsp");
                 
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            
            
        }
        
        
        
    }

}

DbConnect.java

package edu.lishan.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DbConnect {
    public static Connection conn;
    public static Connection getConnection(){
        
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //创建连接对象
        try {
            conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test"
                                               ,"root", "root");
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return conn;
    }

}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
   <title>学生管理系统</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
  </head>
  
  <body>
        <center>
            管理员登录界面
            <form action="loginServer" method="post">
                <table>
                    <Tr>
                        <td>用户名：</td>
                        <td><input type="text" name="admin"></td>
                    </Tr>
                    <Tr>
                        <td>密码：</td>
                        <td><input type="text" name="pwd"></td>
                    </Tr>
                    <tr>
                        <td colspan="2" align="center"><input type="submit" value="登录"></td>
                    </tr>
                </table>
            </form>
        </center>
  </body>
</html>

loginAction.jsp

<%@page import="java.sql.ResultSet"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8" contentType="text/html; charset=utf-8"%>
<%
    ResultSet rs = (ResultSet) session.getAttribute("rs");
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>学生管理系统</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<link rel="stylesheet" type="text/css" href="table.css"/>
</head>
<body>
    <center>
        <table class="gridtable">
            <tr>
                <td align="center" colspan="6">学生信息</td>
            </tr>
            <tr>
                <td>姓名</td>
                <td>性别</td>
                <td>专业</td>
                <td>年级</td>
                <td align="center" colspan="2">操作</td>
            </tr>
            <%
                while (rs.next()) {
            %>
            <tr>
                <td><%=rs.getString("name")%></td>
                <td><%=rs.getString("sex")%></td>
                <td><%=rs.getString("specialty")%></td>
                <td><%=rs.getString("grade")%></td>
                <td>
                    <a href="selectServlet?id=<%=rs.getInt("id")%>">修改 </a>  
                </td>
                <td>
                    <a href="deleteServlet?id=<%=rs.getInt("id")%>" onClick="return confirm('确定要删除吗？');">删除 </a>
                </td>
            </tr>
            <%
                }
            %>
            <tr>
                <td align="center" colspan="6">
                    <a href="stuAdd.jsp">添加 </a>
                </td>
            </tr>
        </table>
    </center>
</body>
</html>

stuAdd.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>添加学生信息</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    
    <link rel="stylesheet" type="text/css" href="table.css"/>
  </head>
  <body>
  <form action="addServlet" method="post">
  <center>
        <table class="gridtable">
            <tr>
                <td align="center" colspan="2">添加学生信息</td>
            </tr>
            <tr>
                <td>姓名</td><td><input type="text" name="name"/></td>
            </tr>
            <tr>
                <td>性别</td>
                <td>
                    <input type="radio" name="sex" value="男" checked="checked"/>男
                    <input type="radio" name="sex" value="女"/>女
                </td>
            </tr>
            <tr>
                <td>专业</td><td><input type="text" name="specialty"/></td>
            </tr>
            <tr>
                <td>年级</td><td>
                <select name="grade">
                     <option value="大一">大一</option>
                     <option value="大二">大二</option>
                     <option value="大三">大三</option>
                     <option value="大四">大四</option>
                </select>
                </td>
            </tr>
            <tr>
                <td align="center" colspan="2"><input type="submit" value="添加"/></td>
            </tr>
    </table>
    </center>
    </form>
  </body>
</html>

完！！

来源：https://www.cnblogs.com/yangchas/p/11167476.html

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