C/C++教程
web 实验四 基于servlet的mvc模式
本文主要是介绍web 实验四 基于servlet的mvc模式，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
在实验开始前要导入相应的jar包。以及相关的library。
bean.studentBean.java
package bean;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import DBuntil.Dbutil;
public class studentBean {
private String name;
private String id;
private String sex;
private String birthday;
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 getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getBirthday() {
return birthday;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
/**
* 从BookInfo表中获取所有的图书信息
*
* @return BookInfo的数组
*/
public static ArrayList<studentBean> getBookList() {
ArrayList<studentBean> list = new ArrayList<studentBean>();
String sql = "select * from students";
Dbutil jdbc = new Dbutil();
ResultSet rs = jdbc.executeQuery(sql);
try {
while (rs.next()) {
studentBean bi = new studentBean();
bi.setId(rs.getString("id"));
bi.setName(rs.getString("name"));
bi.setSex(rs.getString("sex"));
bi.setBirthday(rs.getString("birthday"));
list.add(bi);
}
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
jdbc.close();
return list;
}
/**
* 获取指定id的图书信息
*
* @param id 图书id
* @return 一个BookInfo对象
*/
public static studentBean getStudentById(String id) {
String sql = "select * from students where id=" + id;
Dbutil jdbc = new Dbutil();
ResultSet rs = jdbc.executeQuery(sql);
studentBean bi = new studentBean();
try {
if (rs.next()) {
bi.setId(rs.getString("id"));
bi.setName(rs.getString("name"));
bi.setSex(rs.getString("sex"));
bi.setBirthday(rs.getString("birthday"));
}
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
jdbc.close();
return bi;
}
/**
* 更新指定id的图书信息
*
* @param bi 要更新的图书的对象
* @return 修改的结果：1代表成功，0代表没有更新
*/
public static int updateStudent(studentBean bi) {
int result = 0;
String sql = "update students set name='" + bi.getName() + "',id='" + bi.getId() + "',sex='"
+ bi.getSex() + "',birthday='" + bi.getBirthday() + "' where id='" + bi.getId()+"'";
Dbutil jdbc = new Dbutil();
result = jdbc.executeUpdate(sql);
System.out.println(sql);
jdbc.close();
return result;
}
/**
* 删除指定id的图书
*
* @param id 图书id
* @return 删除的结果：1代表成功，0代表没有删除
*/
public static int deleteStudent(String id) {
int result = 0;
String sql = "delete from students where id=" + id;
Dbutil jdbc = new Dbutil();
result = jdbc.executeUpdate(sql);
System.out.println(sql);
jdbc.close();
return result;
}
/**
* 增加一本图书
*
* @param bi 图书对象
* @return 新增的结果：1代表成功，0代表没有增加
*/
public static int addStudent(studentBean bi) {
int result = 0;
String sql = "insert into students(id,name,sex,birthday) values('" + bi.getId() + "','"+ bi.getName() + "','" + bi.getSex() + "','"
+ bi.getBirthday() + "')";
Dbutil jdbc = new Dbutil();
result = jdbc.executeUpdate(sql);
System.out.println(sql);
jdbc.close();
return result;
}
}
Dbutil.java
package DBuntil;
import java.sql.*;
public class Dbutil {
/**
* 完成与数据库的连接和数据的访问
* @author Leiyu
* @version 1.0
*
*/
private String driverStr = "com.mysql.jdbc.Driver";
private String connStr = "jdbc:mysql://localhost:3306/lab03?uerUnicode=true&characterEncoding=UTF-8";
private String dbusername = "root";
private String dbpassword = "123456";
private Connection conn = null;
private Statement stmt = null;
{
try {
Class.forName(driverStr);
conn = DriverManager.getConnection(connStr, dbusername, dbpassword);
stmt = conn.createStatement();
} catch (Exception ex) {
System.out.println("数据库连接失败！");
}
}
/**
* 执行更新操作
* @param s
* SQL语句
* @return
* 更新操作的结果
*/
public int executeUpdate(String s) {
int result = 0;
try {
result = stmt.executeUpdate(s);
} catch (Exception ex) {
System.out.println("更新出现异常！");
}
return result;
}
/**
* 执行查询操作
* @param s
* SQL语句
* @return
* 查询结果
*/
public ResultSet executeQuery(String s) {
ResultSet rs = null;
try {
rs = stmt.executeQuery(s);
} catch (Exception ex) {
System.out.println("查询出现异常！");
}
return rs;
}
/**
* 关闭数据库
*/
public void close() {
try {
stmt.close();
conn.close();
} catch (Exception e) {
}
}
}
StudenrtController.java
package servlert;
import java.io.IOException;
import java.util.ArrayList;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.*;
import bean.studentBean;
/**
* 用来接收客户端的后缀为do的请求
*
* @author Leiyu
* @version 1.0
*
*/
@WebServlet("*.do")
public class StudentController extends HttpServlet{
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String actionUrl = request.getServletPath(); // 获取客户请求的Servlet地址
if (actionUrl.equals("/index.do")) { // 查询所有学生
ArrayList<studentBean> list = studentBean.getBookList(); // 调用studentBean的getStudentList方法查询所有学生，赋值给list
request.setAttribute("list", list); // 在request增加属性list，其结果为list对象
request.getRequestDispatcher("/index.jsp").forward(request, response);// 重定向至index.jsp进行显示
} else if (actionUrl.equals("/addview.do")) { // 新增学生显示页面
request.getRequestDispatcher("add.jsp").forward(request, response);
} else if (actionUrl.equals("/add.do")) { // 新增学生
studentBean bi = new studentBean();
String id=request.getParameter("id");
bi.setId(id);
String name=request.getParameter("name");
bi.setName(name);
String sex=request.getParameter("sex");
bi.setSex(sex);
String birthday=request.getParameter("year")+"/"+request.getParameter("month")+"/"+request.getParameter("day");
bi.setBirthday(birthday);
int r = studentBean.addStudent(bi); // 调用studentBean的addStudent方法完成
if (r == 1)
request.getRequestDispatcher("success.jsp").forward(request, response); // 成功的话重定向至success.jsp
else
request.getRequestDispatcher("failure.jsp").forward(request, response); // 失败的话重定向至failure.jsp
} else if (actionUrl.equals("/edit.do")) { // 客户端要对指定id的学生进行修改
String id = request.getParameter("id");
studentBean bi = studentBean.getStudentById(id); // 调用studentBean的getStudentById方法获取学生信息，赋值给bi对象
request.setAttribute("bi", bi); // 将bi对象增加到request的属性中
request.getRequestDispatcher("/edit.jsp").forward(request, response);// 重定向至edit.jsp进行显示
} else if (actionUrl.equals("/update.do")) { // 用户输入要修改的学生的信息之后需要保存到数据库
studentBean bi = new studentBean();
bi.setId(request.getParameter("id"));
bi.setName(request.getParameter("name"));
bi.setSex(request.getParameter("sex"));
String birthday=request.getParameter("year")+"/"+request.getParameter("month")+"/"+request.getParameter("day");
bi.setBirthday(birthday);
int r = studentBean.updateStudent(bi);// 调用studentBean的updateStudent方法实现
if (r == 1)
request.getRequestDispatcher("/success.jsp").forward(request, response);// 成功的话重定向至success.jsp
else
request.getRequestDispatcher("/failure.jsp").forward(request, response);// 失败的话重定向至failure.jsp
} else if (actionUrl.equals("/delete.do")) { // 用户需要删除指定id的学生
String id = request.getParameter("id");
int r = studentBean.deleteStudent(id); // 调用studentBean的deleteStudent方法实现
if (r == 1)
request.getRequestDispatcher("/success.jsp").forward(request, response);// 成功的话重定向至success.jsp
else
request.getRequestDispatcher("/failure.jsp").forward(request, response);// 失败的话重定向至failure.jsp
}
}
}
style.css
body {
text-align: center;
}
table {
width: 400px;
border: 1px solid #696969;
border-collapse: collapse;
margin:0 auto;
}
th {
border: 1px solid #696969;
background-color:#9DFCFC;
}
td {
text-align: center;
border: 1px solid #696969;
height: 50px;
background-color:#ff9966;
}
td.ltd {
text-align: left;
}
input {
font-size: 20px;
}
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="bean.studentBean" %>
<html>
<head>
<title>图书管理系统</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<h1>图书管理系统</h1>
<a href="addview.do">增加图书信息</a>
<p />
<table style="width: 50%">
<tr>
<th>姓名</th>
<th>性别</th>
<th>生日</th>
<th>管理</th>
</tr>
<%
@SuppressWarnings("unchecked")
ArrayList<studentBean> list = studentBean.getBookList();
for (studentBean bi : list) {
String id = bi.getId();
%>
<tr>
<td><%=bi.getName()%></td>
<td><%=bi.getSex()%></td>
<td><%=bi.getBirthday()%></td>
<td><a href="edit.do?id=<%=id%>">修改</a> <a
href="delete.do?id=<%=id%>">删除</a></td>
</tr>
<%
}
%>
</table>
<br />
<hr />
<div style="text-align: center; width: 100%; font-size: 12px; color: #333;">
©版权所有：石家庄铁道大学信息科学与技术学院 <a href="Lab04-1.png"
target="_blank">网站地图</a>
</div>
</body>
</html>
add.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加学生信息</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<form action="add.do" method="post">
<h2>添加学生信息</h2>
<table style="width: 50%">
<tr>
<th width="30%">学号：</th>
<td width="70%"><input name="id" type="text"></td>
</tr>
<tr>
<th>姓名：</th>
<td><input name="name" type="text"></td>
</tr>
<tr>
<th>性别：</th>
<td><input name="sex" type="radio" value="男">男
<input name="sex" type="radio" value="女">女 </td>
</tr>
<tr>
<th>生日：</th>
<td><input name="year" type="text" style="width:60px;">年<input name="month" type="text" style="width:40px;">月<input name="day" type="text" style="width:40px;">日</td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="添加"> <input type="reset" value="重置"></td>
</tr>
</table>
</form>
</body>
</html>
edit.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" %>
<%@ page import="bean.studentBean"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改学生信息</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<%
studentBean bi = (studentBean) request.getAttribute("bi");
String year=null;
String month=null;
String day=null;
String birthday=bi.getBirthday();
String res[]=birthday.split("/");
year=res[0];
month=res[1];
day=res[2];
%>
<form action="update.do" method="post">
<input type="hidden" name="id" value="<%=bi.getId()%>">
<table style="width: 50%">
<caption>修改学生信息</caption>
<tr>
<th width="30%">姓名：</th>
<td width="70%"><input name="name" type="text"
value="<%=bi.getName()%>"></td>
</tr>
<tr>
<th>性别：</th>
<%
if ("男".equals(bi.getSex()))
{
out.println("<td><input name='sex' type='radio' value='男' checked>男 "
+ "<input name='sex' type='radio' value='女'>女 </td>");
}
if ("女".equals(bi.getSex())){
out.println("<td><input name='sex' type='radio' value='男' >男 "
+ "<input name='sex' type='radio' value='女' checked>女 </td>");}
%>
</tr>
<tr>
<th>生日：</th>
<th>
<input name="year" type="text"
style="width:60px;" value="<%=year%>" >年
<input name="month" type="text"
style="width:40px;" value="<%=month%>">月
<input name="day" type="text"
style="width:40px;" value="<%=day%>">日
</th> </tr>
<tr>
<th colspan="2"><input type="submit" value="修改"> <input
type="reset" value="重置"></th>
</tr>
</table>
</form>
</body>
</html>
success.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" type="text/css" href="css/style.css">
<title>操作成功提示</title>
</head>
<body>
<p style="color: #CC1111">操作成功!</p>
<a href="index.do">转到主页</a>
</body>
</html>
failure.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" type="text/css" href="css/style.css">
<title>Insert title here</title>
</head>
<body>
操作失败!
<a href="javascript:history.back()">返回</a>
</body>
</html>
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