java swing mysql 下面的代码无法连接到数据库 插入数据

数据库|mysql教程

swing

mysql

java

数据库-mysql教程

swingmysqljava

卡密源码下载,ubuntu卸载安装清除,tomcat9和jdk12,爬虫美甲图片,php7可以代替mysql吗,seo运营思路lzw

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.sql.*;

视频内容源码流,vscode添加c语言支持,ubuntu tar c,怎么重新布置tomcat,浙江爬虫软件,php get 特殊字符,绍兴seo推广外包公司,企业手机网站单页模板免费下载,dedecms 模板赋值lzw

class Test

{

/*private String driver=”com.mysql.jdbc.Driver”;

private String url=”jdbc:mysql://localhost:3306/technology”;

private String user=”root”;

private String pass=”root”;*/

mysql源码查看,ubuntu管不机,tomcat示例文件漏洞,py 爬虫 动态,php增加图片亮度,想学seo怎么学seo顾问lzw

JFrame f;Dialog d1,d2,r_interface;JButton jb1,jb2,b3,b4,b5,r_inquire,r_insert,r_delete;JLabel jl,l1,l2;TextField tf1;TextField tf2;Test(){ init();}public void init(){ /*try { Class.forName(driver); } catch (ClassNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); }*/ f=new JFrame(); jl=new JLabel("江西农业大学三检工作系统"); jb1=new JButton("登陆"); jb2=new JButton("注册"); f.setVisible(true); f.setBounds(400,200,400,300); f.setLayout(null); f.setResizable(false); jb1.setBounds(110,130,70,30); jb2.setBounds(200,130,70,30); jl.setBounds(110,70,200,50); f.add(jb1); f.add(jb2); f.add(jl); d1=new Dialog(f,"用户登陆",true); d2=new Dialog(f,"用户注册",true); b3=new JButton("确定"); b4=new JButton("取消");//登陆界面的取消按钮 b5=new JButton("取消");//注册界面的取消按钮 myevent();}public void myevent(){ f.addWindowListener(new WindowAdapter() //窗口退出事件监听 { public void windowClosing(WindowEvent e) { System.exit(0); } }); d1.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { d1.setVisible(false); } }); d2.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { d2.setVisible(false); } }); b3.addActionListener(new ActionListener() //登陆界面的确定 { public void actionPerformed(ActionEvent e) { dlcg(); } }); b4.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { d1.setVisible(false); } }); b5.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { d2.setVisible(false); } }); jb1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { denglu(); } }); jb2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { zhuce(); } });}public void dlcg(){ r_interface=new Dialog(f,"登陆成功",true); r_inquire=new JButton("查询"); r_insert=new JButton("插入"); r_delete=new JButton("删除"); r_interface.setLayout(null); r_interface.add(r_inquire); r_inquire.setBounds(80,60,120,30); r_interface.setVisible(true); Connection conn = null; PreparedStatement psta=null; String z_user=String.valueOf(tf1.getText()); String z_pass=String.valueOf(tf2.getText()); try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb","root","root"); psta = conn.prepareStatement("insert into teacher (tname,tage) values (?, ?)"); psta.setString(1,z_user); psta.setString(2,z_pass); psta.executeUpdate(); } catch(ClassNotFoundException e) { e.printStackTrace(); } catch(SQLException e) { e.printStackTrace(); } finally { try { if(conn != null) {conn.close(); } if(psta != null) {psta.close(); } } catch(SQLException e) { e.printStackTrace(); } } /*String z_user=tf1.getText(); String z_pass=tf2.getText(); Connection cn = null; PreparedStatement pst = null; try { String sql="insert into register (r_account,r_password) values (?, ?)"; cn = DriverManager.getConnection(url,user,pass); pst = cn.prepareStatement(sql); pst.setString(1,z_user); pst.setString(2,z_pass); pst.executeUpdate(); } catch(SQLException e) { e.printStackTrace(); } finally { try { if(pst!=null) {pst.close(); } if(cn!=null) {cn.close(); } } catch(SQLException e) { e.printStackTrace();} } */}public void denglu(){ l1=new JLabel("用户名"); l2=new JLabel("密 码"); tf1=new TextField(); tf2=new TextField(); tf2.setEchoChar(*); d1.setBounds(470,240,260,230); d1.setLayout(null); d1.setResizable(false); d1.add(l1); d1.add(l2); d1.add(b3); d1.add(b4); d1.add(tf1); d1.add(tf2); tf1.setBounds(80,60,120,30); tf2.setBounds(80,100,120,30); tf1.setFont(new Font("宋体",1,20)); tf2.setFont(new Font("宋体",1,20)); b3.setBounds(50,150,70,30); b4.setBounds(150,150,70,30); l1.setBounds(20,60,50,30); l2.setBounds(20,100,50,30); d1.setVisible(true); }public void zhuce(){ l1=new JLabel("注册名"); l2=new JLabel("密 码"); //b3=new JButton("确定"); tf1=new TextField(); tf2=new TextField(); tf2.setEchoChar(*); d2.setBounds(470,240,260,230); d2.setLayout(null); d2.setResizable(false); d2.add(l1); d2.add(l2); d2.add(b3); d2.add(b5); d2.add(tf1); d2.add(tf2); tf1.setBounds(80,60,120,30); tf2.setBounds(80,100,120,30); tf1.setFont(new Font("宋体",1,20)); tf2.setFont(new Font("宋体",1,20)); b3.setBounds(50,150,70,30); b5.setBounds(150,150,70,30); l1.setBounds(20,60,50,30); l2.setBounds(20,100,50,30); d2.setVisible(true);}public static void main(String[] args){ Connection conn = null; PreparedStatement psta=null; new Test(); }

}