JavaWeb 学生信息管理系统
三层架构（MVC）完成学生管理系统
包含了前端，Servlet，数据库等
使用Eclipse+Tomcat+MySQL完成
效果图：
首页：
增加，删除，更新，查看功能可以正常使用
增加功能：
更新功能：
详情页：
并未优化前端页面。
代码：
代码结构：
前端代码：
index.jsp
<%@page import="org.student.entity.Student"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Index
<%
request.setCharacterEncoding("utf-8");
List students = (List)request.getAttribute("students");
%>
Student No
Student Name
Student Age
Student Address
Delete student
Update student
Details page
<%
for(Student student:students){
%>
<%=student.getSno() %>
<%=student.getSname() %>
<%=student.getSage() %>
<%=student.getSaddress() %>
Delete
Update
Details
<%
}
%>
Add Student
add.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Add Student
Please enter the student Information of the student you want to add:
update.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Update Student Information
<%
int sno = Integer.parseInt(request.getParameter("sno"));
%>
detailsPage.jsp
<%@page import="org.student.entity.Student"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Student Details Page
<%
Student student = (Student)request.getAttribute("student");
%>
Student No Is : <%=student.getSno() %>
Student Name Is : <%=student.getSname() %>
Student Age Is : <%=student.getSage() %>
Student Address Is : <%=student.getSaddress() %>
后端代码：
实体类：
package org.student.entity;
//实体类
public class Student {
private int sno;
private String sname;
private int sage;
private String saddress;
public Student() {}
public Student(String sname, int sage, String saddress) {
this.sname = sname;
this.sage = sage;
this.saddress = saddress;
}
public Student(int sno, String sname, int sage, String saddress) {
this.sno = sno;
this.sname = sname;
this.sage = sage;
this.saddress = saddress;
}
public int getSno() {
return sno;
}
public void setSno(int sno) {
this.sno = sno;
}
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public int getSage() {
return sage;
}
public void setSage(int sage) {
this.sage = sage;
}
public String getSaddress() {
return saddress;
}
public void setSaddress(String saddress) {
this.saddress = saddress;
}
public String toString() {
return this.getSno()+"--"+this.getSname()+"--"+this.getSage()+"--"+this.getSaddress();
}
}
AddStudentServlet
package org.sudent.servlet;
//表示层：Servlet
import java.io.IOException;
import java.io.PrintWriter;
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 org.student.entity.Student;
import org.student.service.StudentService;
@WebServlet("/AddStudentServlet")
public class AddStudentServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public AddStudentServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=UTF-8");
PrintWriter out = response.getWriter();
response.setCharacterEncoding("utf-8");
int no = Integer.parseInt(request.getParameter("sno")) ;
String name = request.getParameter("sname");
int age = Integer.parseInt(request.getParameter("sage"));
String address = request.getParameter("saddress");
Student student = new Student(no,name,age,address);
StudentService studentService = new StudentService();
boolean rs = studentService.addStudent(student);
if(rs) {
response.sendRedirect("QueryAllStudentServlet");
}else {
out.println("增加失败！");
}
//
// StudentDao studentDao = new StudentDao();
// Student student1 = studentDao.queryStudentBySno(no);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
DeleteStudentServlet:
package org.sudent.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 org.student.service.StudentService;
@WebServlet("/DeleteStudentServlet")
public class DeleteStudentServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public DeleteStudentServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().append("Served at: ").append(request.getContextPath());
request.setCharacterEncoding("utf-8");
int no = Integer.parseInt(request.getParameter("sno")) ;
StudentService studentService = new StudentService();
studentService.deleteStudentBySno(no);
response.sendRedirect("QueryAllStudentServlet");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
UpdateStudentServlet:
package org.sudent.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 org.student.entity.Student;
import org.student.service.StudentService;
@WebServlet("/UpdateStudentServlet")
public class UpdateStudentServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public UpdateStudentServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().append("Served at: ").append(request.getContextPath());
request.setCharacterEncoding("utf-8");
int no = Integer.parseInt(request.getParameter("sno")) ;
String name = request.getParameter("sname");
int age = Integer.parseInt(request.getParameter("sage"));
String address = request.getParameter("saddress");
Student student = new Student(name,age,address);
StudentService studentService = new StudentService();
studentService.updateStudentBySno(no, student);
response.sendRedirect("QueryAllStudentServlet");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
QueryStudentBySnoServlet
package org.sudent.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 org.student.entity.Student;
import org.student.service.StudentService;
@WebServlet("/QueryStudentBySnoServlet")
public class QueryStudentBySnoServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public QueryStudentBySnoServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().append("Served at: ").append(request.getContextPath());
request.setCharacterEncoding("utf-8");
int no = Integer.parseInt(request.getParameter("sno")) ;
StudentService studentService = new StudentService();
Student student = studentService.queryStudentBySno(no);
System.out.println(student);
request.setAttribute("student", student);
request.getRequestDispatcher("detailsPage.jsp").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
QueryAllStudentServlet
package org.sudent.servlet;
import java.io.IOException;
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 org.student.entity.Student;
import org.student.service.StudentService;
@WebServlet("/QueryAllStudentServlet")
public class QueryAllStudentServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public QueryAllStudentServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().append("Served at: ").append(request.getContextPath());
request.setCharacterEncoding("utf-8");
StudentService studentService = new StudentService();
List<Student> students = studentService.queryAllStudent();
System.out.println(students);
request.setAttribute("students", students);
request.getRequestDispatcher("index.jsp").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
Dao层
StudentDao.java:
package org.student.dao;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.student.entity.Student;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
//数据访问层——》数据库
public class StudentDao {//原子性的：增删改查 无法拆分
private final String URL = "jdbc:mysql://localhost:3306/student";
private final String USERNAME = "root";
private final String PASSWORD = "123456";
//根据学号判断是否存在该学生
public boolean isExist(int sno) {
return queryStudentBySno(sno)==null?false:true;
}
//删除学生
public boolean deleteStudentBySno(int sno) {
Connection connection = null;
PreparedStatement pstmt = null;
try {
Class.forName("com.mysql.jdbc.Driver");
connection = (Connection) DriverManager.getConnection(URL,USERNAME,PASSWORD);
String sql = "delete from student where sno=?";
pstmt = (PreparedStatement) connection.prepareStatement(sql);
pstmt.setInt(1, sno);
int count = pstmt.executeUpdate();
if(count > 0)
return true;
else
return false;
}catch (ClassNotFoundException e) {
e.printStackTrace();
return false;
} catch (SQLException e) {
e.printStackTrace();
return false;
} catch (Exception e) {
e.printStackTrace();
return false;
}
finally {
try {
if(pstmt!=null)pstmt.close();
if(connection!=null)connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//增加学生
public boolean addStudent(Student student){
Connection connection = null;
PreparedStatement pstmt = null;
try {
//加载驱动
Class.forName("com.mysql.jdbc.Driver" );
connection = (Connection) DriverManager.getConnection(URL,USERNAME,PASSWORD);
String sql = "insert into student(sno,sname,sage,saddress) values(?,?,?,?)";
pstmt = (PreparedStatement) connection.prepareStatement(sql);
pstmt.setInt(1, student.getSno());
pstmt.setString(2, student.getSname());
pstmt.setInt(3, student.getSage());
pstmt.setString(4, student.getSaddress());
int count = pstmt.executeUpdate();
if(count > 0)
return true;
else
return false;
} catch (ClassNotFoundException e) {
e.printStackTrace();
return false;
} catch (SQLException e) {
e.printStackTrace();
return false;
} catch (Exception e) {
e.printStackTrace();
return false;
}
finally {
try {
if(pstmt!=null)pstmt.close();
if(connection!=null)connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//根据学号查找学生
public Student queryStudentBySno(int sno) {
Student student = null;
Connection connection = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
//加载驱动
Class.forName("com.mysql.jdbc.Driver" );
connection = (Connection) DriverManager.getConnection(URL,USERNAME,PASSWORD);
String sql = "select * from student where sno = ?";
pstmt = (PreparedStatement) connection.prepareStatement(sql);
pstmt.setInt(1, sno);
rs = pstmt.executeQuery();
if(rs.next()) {
int no = rs.getInt("sno");
String name = rs.getString("sname");
int age = rs.getInt("sage");
String address = rs.getString("saddress");
// System.out.println(no+name+age+address);
student = new Student(no,name,age,address);
}
return student;
} catch (ClassNotFoundException e) {
e.printStackTrace();
return null;
} catch (SQLException e) {
e.printStackTrace();
return null;
} catch (Exception e) {
e.printStackTrace();
return null;
}
finally {
try {
if(rs!=null)rs.close();
if(pstmt!=null)pstmt.close();
if(connection!=null)connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//查询全部学生
public List<Student> queryAllStudent() {
List<Student> students = new ArrayList<>();
Student student = null;
Connection connection = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
//加载驱动
Class.forName("com.mysql.jdbc.Driver" );
connection = (Connection) DriverManager.getConnection(URL,USERNAME,PASSWORD);
String sql = "select * from student";
pstmt = (PreparedStatement) connection.prepareStatement(sql);
rs = pstmt.executeQuery();
while(rs.next()) {
int no = rs.getInt("sno");
String name = rs.getString("sname");
int age = rs.getInt("sage");
String address = rs.getString("saddress");
student = new Student(no,name,age,address);
students.add(student);
}
return students;
} catch (ClassNotFoundException e) {
e.printStackTrace();
return null;
} catch (SQLException e) {
e.printStackTrace();
return null;
} catch (Exception e) {
e.printStackTrace();
return null;
}
finally {
try {
if(rs!=null)rs.close();
if(pstmt!=null)pstmt.close();
if(connection!=null)connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//根据学号修改学生信息
public boolean updateStudentBySno(int sno,Student student) {
Connection connection = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
//加载驱动
Class.forName("com.mysql.jdbc.Driver" );
connection = (Connection) DriverManager.getConnection(URL,USERNAME,PASSWORD);
String sql = "update student set sname=?,sage=?,saddress=? where sno=?";
pstmt = (PreparedStatement) connection.prepareStatement(sql);
pstmt.setString(1, student.getSname());
pstmt.setInt(2, student.getSage());
pstmt.setString(3, student.getSaddress());
pstmt.setInt(4, sno);
int count = pstmt.executeUpdate();
if(count > 0)
return true;
else
return false;
} catch (ClassNotFoundException e) {
e.printStackTrace();
return false;
} catch (SQLException e) {
e.printStackTrace();
return false;
} catch (Exception e) {
e.printStackTrace();
return false;
}
finally {
try {
if(rs!=null)rs.close();
if(pstmt!=null)pstmt.close();
if(connection!=null)connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
service层
StudentService.java:
package org.student.service;
import java.util.List;
import org.student.dao.StudentDao;
import org.student.entity.Student;
//业务逻辑层 可拆分
public class StudentService {
StudentDao studentDao = new StudentDao();
//增加学生，先判断是否存在学生，在增加学生
public boolean addStudent(Student student) {
if(!studentDao.isExist(student.getSno())) {
studentDao.addStudent(student);
return true;
}else {
System.out.println(student.getSno()+ student.getSname()+student.getSage() +student.getSaddress());
System.out.println("此人已存在！增加失败!");
return false;
}
}
//删除学生，先判断是否存在学生，在删除学生
public boolean deleteStudentBySno(int sno) {
if(studentDao.isExist(sno)) {
return studentDao.deleteStudentBySno(sno);
}else {
System.out.println("此人不存在！删除失败!");
return false;
}
}
//根据学号修改学生信息，先判断学生是否存在，在修改
public boolean updateStudentBySno(int sno,Student student) {
if(studentDao.isExist(sno)) {
return studentDao.updateStudentBySno(sno, student);
}else {
System.out.println("此人不存在！修改失败!");
return false;
}
}
//根据学号查询学生
public Student queryStudentBySno(int sno) {
return studentDao.queryStudentBySno(sno);
}
//查询全部学生
public List<Student> queryAllStudent(){
return studentDao.queryAllStudent();
}
}
结构基本完善，后期的接口和DBUtil并未完善，数据分页并未实现