现在是 2021年04月26日11:05:08 ,趁今天有空把它搞完. 这里呢采用德鲁伊连接池哈 记得导包
目录
1先上效果图
2上截图
3代码共享
4结
1先上效果图
2上截图
点击删除2
3代码共享
dataOperation.jsp
<%--
Created by IntelliJ IDEA.
User: zhangxu
Date: 2021/4/26
Time: 10:32 上午
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>修改</title>
</head>
<body>
<form action="/modify?id=${stu.id}" method="post">
<input value="${stu.name}" type="text" name="name">姓名 <br>
<input value="${stu.sex}" type="text" name="sex">性别 <br>
<input value="${stu.major}" type="text" name="major">职业 <br>
<input value="${stu.hometown}" type="text" name="hometown">故乡 <br>
<input type="submit" value="确认修改">
</form>
</body>
</html>
StudentDao
import zx.bean.Student;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public interface StudentDao {
List<Student> getStudentsFromDB() throws SQLException, IOException;
void delete(int id) throws SQLException;
void insertDB(ArrayList students);
void insert(Student student);
Student findById(Integer id);
void update(int id, Student newStudent);
}
StudentdaoImpl(这个不写,但是Dao层主要是靠这个跟数据库打交道,所以挂一下)
package zx.dao.impl;
import zx.bean.Student;
import zx.dao.StudentDao;
import zx.util.DruidUtil;
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 java.util.ResourceBundle;
//接口名+Impl=当前类名 表示一个实现类
public class StudentDaoimpl extends DruidUtil implements StudentDao {
@Override
public List<Student> getStudentsFromDB() {
ArrayList<Student> list=new ArrayList<>();
Connection connection =null;
PreparedStatement preparedStatement=null;
ResultSet resultSet =null;
try {
connection = getConnection();
preparedStatement= connection.prepareStatement("select * from student");
resultSet = preparedStatement.executeQuery();
while (resultSet.next()){
Student student = new Student();
student.setId(resultSet.getInt("id"));
student.setName(resultSet.getString("name"));
student.setSex(resultSet.getString("Sex"));
student.setMajor(resultSet.getString("major"));
student.setHometown(resultSet.getString("hometown"));
list.add(student);
}
} catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
close(connection,preparedStatement,resultSet);
}
return list;
}
@Override
public void delete(int id) throws SQLException {
Connection connection =null;
PreparedStatement preparedStatement=null;
try{
connection = getConnection();
preparedStatement= connection.prepareStatement("delete from student where id="+id);
preparedStatement.executeUpdate();
}catch (Exception e){
throw e;
}finally {
close(connection,preparedStatement,null);
}
}
@Override
public void insertDB(ArrayList students) {
//首先我们我们要解析文件
ResourceBundle resource = ResourceBundle.getBundle("/Student");
//解析文件以后我们将文件内容存入数据库
Connection connection =null;
PreparedStatement preparedStatement=null;
List list = new ArrayList();
int id = Integer.parseInt(resource.getString("id"));
String name=resource.getString("name");
String sex=resource.getString("sex");
String major=resource.getString("major");
String hometown=resource.getString("hometown");
try{
connection = getConnection();
preparedStatement=connection.prepareStatement("insert into student values("+id+",'"+name+"','"+sex+"','"+major+"','"+hometown+"')"+";");
preparedStatement.executeUpdate();
}catch (Exception e){
System.out.println(e);
}finally {
if(connection==null){
close(null,preparedStatement,null);
return ;
}
close(connection,preparedStatement,null);
}
}
@Override
public void insert(Student student) {
//解析文件以后我们将文件内容存入数据库
Connection connection =null;
PreparedStatement preparedStatement=null;
Integer id=student.getId();
String name=student.getName();
String sex=student.getSex();
String major=student.getMajor();
String hometown=student.getHometown();
try{
connection = getConnection();
preparedStatement=connection.prepareStatement("insert into student values("+id+",'"+name+"','"+sex+"','"+major+"','"+hometown+"')"+";");
preparedStatement.executeUpdate();
}catch (Exception e){
System.out.println(e);
}finally {
if(connection==null){
close(null,preparedStatement,null);
return ;
}
close(connection,preparedStatement,null);
}
}
@Override
public Student findById(Integer id) {
Connection connection =null;
PreparedStatement preparedStatement=null;
ResultSet set=null;
Student student=new Student();
try{
connection = getConnection();
preparedStatement= connection.prepareStatement("select * from student where id="+id);
set= preparedStatement.executeQuery();
while(set.next()){
student.setId(id);
student.setName(set.getString(2));
student.setSex(set.getString(3));
student.setMajor(set.getString(4));
student.setHometown(set.getString(5));
return student;
}
}catch (Exception e){
System.out.println(e);
}finally {
close(connection,preparedStatement,set);
}
return null;
}
@Override
public void update(int id, Student newStudent) {
Connection connection =null;
PreparedStatement preparedStatement=null;
String newName=newStudent.getName();
String newSex=newStudent.getSex();
String newMajor=newStudent.getMajor();
String newHometown=newStudent.getHometown();
try{
connection = getConnection();
preparedStatement= connection.prepareStatement("update student set name= '"+newName+"', sex='"+newSex+"' ,major='"+newMajor+"', hometown='"+newHometown+"' where id="+id);
preparedStatement.executeUpdate();
}catch (Exception e){
System.out.println(e);
}finally {
close(connection,preparedStatement,null);
}
}
}
addStudentServlet
package zx.servlets;
import zx.bean.Student;
import zx.service.StudentService;
import zx.service.impl.StudentServiceimpl;
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;
import java.sql.SQLException;
import java.util.List;
/**
* @Author CaesarChang张旭
* @Date 2021/4/26 10:01 上午
* @Version 1.0
*/
@WebServlet("/addStudent")
public class addStudentServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
StudentService service=new StudentServiceimpl();
String id = req.getParameter("id");
String name = req.getParameter("name");
String sex = req.getParameter("sex");
String major = req.getParameter("major");
String hometown = req.getParameter("hometown");
Student student=new Student(Integer.parseInt(id),name,sex,major,hometown);
service.insert(student);
List<Student> getAll = null;
try {
getAll = service.getStudentFromDB();
req.setAttribute("getAll",getAll);
} catch (SQLException throwables) {
throwables.printStackTrace();
}
req.getRequestDispatcher("show.jsp").forward(req,resp);
}
}
findModifyStudent
package zx.servlets;
import zx.bean.Student;
import zx.service.StudentService;
import zx.service.impl.StudentServiceimpl;
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;
/**
* @Author CaesarChang张旭
* @Date 2021/4/26 10:25 上午
* @Version 1.0
*/
@WebServlet("/findStu")
public class findModifyStudent extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
StudentService service=new StudentServiceimpl();
Integer id = Integer.parseInt(req.getParameter("id"));
Student byId = service.findById(id);
req.setAttribute("stu",byId);
req.getRequestDispatcher("dataOperation.jsp").forward(req,resp);
}
}
4结
当然其他部分还有很多,但是只要求写这几个,都给你们了哈 记得关注下 拜了个拜
打一波我自己课程的广告哈 😝
数据库系统概论速成: https://www.bilibili.com/video/BV1jf4y147jz
javaWeb课设: https://www.bilibili.com/video/BV1bh411D7Wb
