对Javaweb的相关练习之利用.jsp文件和.java文件将输入的数据存储到指定的数据库中
2024-09-08 14:43:29
练习分析
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.awt.datatransfer.DataFlavor;
import java.io.*;
import java.security.Principal;
import java.sql.*;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Locale;
import java.util.Map;
@WebServlet("/DBU")
public class DBUtil extends HttpServlet{
public static void main(String[] args) throws ClassNotFoundException, SQLException {
Class.forName("com.mysql.cj.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/ad","root","root");
String sql="insert into students values(?,?,?,?)";
PreparedStatement pst = conn.prepareStatement(sql);
// String name=request.getParameter("name");
//
// String id=request.getParameter("id");
//
// String age1= request.getParameter("age");
//
// String score1= request.getParameter("score");
//
// int age=Integer.parseInt("age1");
//
// int score=Integer.parseInt("score1");
pst.setString(1,"lisi");
pst.setString(2,"2023");
pst.setInt(3,21);
pst.setInt(4,540);
int i = pst.executeUpdate();
if(i>0){
System.out.println("添加成功！");
pst.close();
conn.close();
}
else{
System.out.println("添加失败！");
}
}
}
上述代码为最基本的内容，指定某一组数，将其输送到指定的数据库中，目前还需实现，将从.jsp页面输入的内容，存储到指定的数据库的功能；
Information.java
package com.tao.enty;
public class Information {
public String name;
public String id;
public Integer age;
public Integer score;
public void setName(String name){
this.name=name;
}
public String getName(){
return name;
}
public void setId(String id){
this.id=id;
}
public String getId(){
return id;
}
public void setAge(Integer age){
this.age=age;
}
public Integer getAge(){
return age;
}
public void setScore(Integer score){
this.score=score;
}
public Integer getScore(){
return score;
}
public Information(String name,String id,Integer age,Integer score){
super();
this.name=name;
this.id=id;
this.age=age;
this.score=score;
}
public Information(){
super();
}
}
UserDao.java
package com.tao.dao;
import com.tao.enty.Information;
public class UserDao extends BaseDao {
public Information dologin(String name, String id, Integer age, Integer score){
Information in=null;
try {
super.connect();
String sql="select * from students where name=? and where id=? and where age=? and where score=?";
pst=conn.prepareStatement(sql);
pst.setString(1, name);
pst.setString(2,id);
pst.setInt(3,age);
pst.setInt(4,score);
rs=pst.executeQuery();
while(rs.next()){
in=new Information();
in.setName(rs.getString("name"));
in.setId(rs.getString("id"));
in.setAge(rs.getInt("age"));
in.setScore(rs.getInt("score"));
}
} catch (Exception e) {
e.printStackTrace();
}finally{
super.closeAll();
}
return in;
}
public int insert(Information in){
int row=0;
try {
super.connect();
String sql="insert into students values(?,?,?,?)";
pst=conn.prepareStatement(sql);
pst.setString(1, in.getName());
pst.setString(2,in.getId());
pst.setInt(3, in.getAge());
pst.setInt(4, in.getScore());
row=pst.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}finally{
super.closeAll();
}
return row;
}
}
BaseDao.java
package com.tao.dao;
import java.sql.*;
public class BaseDao {
public Connection conn=null;
public Statement stmt=null;
public ResultSet rs=null;
public String url="jdbc:mysql://localhost:3306/ad";
public String username="root";
public String password="20214063";
public PreparedStatement pst=null;
public void connect(){
try {
Class.forName("com.mysql.cj.jdbc.Driver");
conn = DriverManager.getConnection(url, username, password);
stmt = conn.createStatement();
} catch(Exception e) {
e.printStackTrace();
}
}
public void closeAll(){
try {
if (rs != null) {
rs.close();
}
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
if(pst!=null){
pst.close();
}
}catch(Exception e) {
}
}
}
index.jsp
<%@ page import="java.util.List" %><%--
Created by IntelliJ IDEA.
User: 12140
Date: 2022/9/22
Time: 10:54
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>注册页面</title>
</head>
<body>
<h1>添加学生信息</h1>
<form action="FenXi.jsp" method="post">
姓名:<input type="text" name="name"/><br/>
学号:<input type="text" name="id"/><br/>
年龄:<input type="text" name="age"/><br/>
成绩:<input type="text" name="score"/><br/>
<input type="submit" name="smt" value="提交"/>
</form>
</body>
</html>
FenXi.jsp
<%@ page import="com.tao.enty.Information"%>
<%@ page import="com.tao.dao.UserDao"%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
Integer age=Integer.valueOf(request.getParameter("age"));
Integer score=Integer.valueOf(request.getParameter("score"));
String name=request.getParameter("name");
String id=request.getParameter("id");
Information i =new Information();
i.setAge(age);
i.setScore(score);
i.setName(name);
i.setId(id);
UserDao ud=new UserDao();
int x=ud.insert(i);
if(x!=0){
request.getRequestDispatcher("/success.jsp").forward(request, response);
}
else{
request.getRequestDispatcher("/Fail.jsp").forward(request, response);
}
%>
</body>
</html>
本次的代码可以实现将在jsp页面中输入的内容，存储到指定数据库中去的功能！
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