java登录最简单代码 java简单登录界面代码

Java如何登录token的代码是什么？

首先是Token主类。类很简单\x0d\x0a\x0d\x0apackage com.company.util;\x0d\x0a\x0d\x0aimport java.util.ArrayList;\x0d\x0a\x0d\x0aimport javax.servlet.http.HttpSession;\x0d\x0a\x0d\x0apublic class Token {\x0d\x0a\x0d\x0aprivate static final String TOKEN_LIST_NAME = "tokenList";\x0d\x0a\x0d\x0apublic static final String TOKEN_STRING_NAME = "token";\x0d\x0a\x0d\x0aprivate static ArrayList getTokenList(HttpSession session) {\x0d\x0a\x0d\x0a Object obj = session.getAttribute(TOKEN_LIST_NAME);\x0d\x0a\x0d\x0a if (obj != null) {\x0d\x0a\x0d\x0a return (ArrayList) obj;\x0d\x0a\x0d\x0a } else {\x0d\x0a\x0d\x0a ArrayList tokenList = new ArrayList();\x0d\x0a\x0d\x0a session.setAttribute(TOKEN_LIST_NAME, tokenList);\x0d\x0a\x0d\x0a return tokenList;\x0d\x0a\x0d\x0a }\x0d\x0a\x0d\x0a }\x0d\x0a\x0d\x0aprivate static void saveTokenString(String tokenStr, HttpSession session) {\x0d\x0a\x0d\x0a ArrayList tokenList = getTokenList(session);\x0d\x0a\x0d\x0a tokenList.add(tokenStr);\x0d\x0a\x0d\x0a session.setAttribute(TOKEN_LIST_NAME, tokenList);\x0d\x0a\x0d\x0a }\x0d\x0a\x0d\x0aprivate static String generateTokenString(){\x0d\x0a\x0d\x0a return new Long(System.currentTimeMillis()).toString();\x0d\x0a\x0d\x0a }\x0d\x0a\x0d\x0a/** *//**\x0d\x0a\x0d\x0a * Generate a token string, and save the string in session, then return the token string.\x0d\x0a\x0d\x0a * \x0d\x0a\x0d\x0a * @param HttpSession\x0d\x0a\x0d\x0a * session\x0d\x0a\x0d\x0a * @return a token string used for enforcing a single request for a particular transaction.\x0d\x0a\x0d\x0a */\x0d\x0a\x0d\x0a public static String getTokenString(HttpSession session) {\x0d\x0a\x0d\x0a String tokenStr = generateTokenString();\x0d\x0a\x0d\x0a saveTokenString(tokenStr, session);\x0d\x0a\x0d\x0a return tokenStr;\x0d\x0a\x0d\x0a }\x0d\x0a\x0d\x0a/** *//**\x0d\x0a\x0d\x0a * check whether token string is valid. if session contains the token string, return true. \x0d\x0a\x0d\x0a * otherwise, return false.\x0d\x0a\x0d\x0a * \x0d\x0a\x0d\x0a * @param String\x0d\x0a\x0d\x0a * tokenStr\x0d\x0a\x0d\x0a * @param HttpSession\x0d\x0a\x0d\x0a * session\x0d\x0a\x0d\x0a * @return true: session contains tokenStr; false: session is null or tokenStr is id not in session\x0d\x0a\x0d\x0a */\x0d\x0a\x0d\x0a public static boolean isTokenStringValid(String tokenStr, HttpSession session) {\x0d\x0a\x0d\x0a boolean valid = false;\x0d\x0a\x0d\x0a if(session != null){\x0d\x0a\x0d\x0a ArrayList tokenList = getTokenList(session);\x0d\x0a\x0d\x0a if (tokenList.contains(tokenStr)) {\x0d\x0a\x0d\x0a valid = true;\x0d\x0a\x0d\x0a tokenList.remove(tokenStr);\x0d\x0a\x0d\x0a }\x0d\x0a\x0d\x0a }\x0d\x0a\x0d\x0a return valid;\x0d\x0a\x0d\x0a }\x0d\x0a\x0d\x0a}\x0d\x0a\x0d\x0a在jsp页面端。\x0d\x0a\x0d\x0a首先import该类：\x0d\x0a\x0d\x0a\x0d\x0a\x0d\x0a表单包含隐藏的token字符串:\x0d\x0a\x0d\x0a\x0d\x0a\x0d\x0a\x0d\x0a\x0d\x0a\x0d\x0a\x0d\x0a在Servlet中添加如下代码。\x0d\x0a\x0d\x0aif(Token.isTokenStringValid(request.getParameter(Token.TOKEN_STRING_NAME), request.getSession())){\x0d\x0a\x0d\x0a//进行正常业务流程

相关问答

Q1: 求JAVA实现用户登录界面代码？

你要先学会截图哦,你发的看不清楚,重新写了一个你参考参考!

import java.awt.GridLayout;

import javax.swing.ButtonGroup;

import javax.swing.JButton;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

import javax.swing.JTextField;

public class Day30A extends JFrame {

private static final long serialVersionUID = 1L;

private JLabel labelName,labelId,labelPass,labelMoney,labelSelect,labelCar;

private JComboBoxString jcb;

private JPanel jp1,jp2,jp3,jp4,jp5,jp6,jp7;

private ButtonGroup btg;

private JRadioButton jr1,jr2;

Day30A(){

this.setTitle("注册账户");

this.setLayout(new GridLayout(7,1));

this.setSize(300,280);

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

init();

this.setVisible(true);

}

private void init() {

String str="卡片类型1,卡片类型2,卡片类型3,卡片类型4,卡片类型5";

jcb=new JComboBox(str.split(","));

labelId=new JLabel("账号: ");

labelName=new JLabel("姓名: ");

labelPass=new JLabel("密码: ");

labelMoney=new JLabel("开户金额:");

labelSelect=new JLabel("存款类型:");

labelCar=new JLabel("卡片类型:");

addFun1();

addFun2();

}

private void addFun2() {

this.add(jp1);

this.add(jp2);

this.add(jp3);

this.add(jp4);

this.add(jp5);

this.add(jp6);

this.add(jp7);

}

private void addFun1() {

jp1=new JPanel();

jp1.add(labelId);

jp1.add(new JTextField(15));

jp2=new JPanel();

jp2.add(labelName);

jp2.add(new JTextField(15));

jp3=new JPanel();

jp3.add(labelPass);

jp3.add(new JTextField(15));

jp4=new JPanel();

jp4.add(labelMoney);

jp4.add(new JTextField(13));

jp5=new JPanel();

jp5.add(labelSelect);

btg=new ButtonGroup();

jr1=new JRadioButton("定期");

jr2=new JRadioButton("活期",true);

btg.add(jr1);

btg.add(jr2);

jp5.add(jr1);

jp5.add(jr2);

jp6=new JPanel();

jp6.add(labelCar);

jp6.add(jcb);

jp7=new JPanel();

jp7.add(new JButton("确定"));

jp7.add(new JButton("取消"));

}

public static void main(String[] args) {

new Day30A();

}

}

Q2: 如何用JAVA编写一个简单用户登陆界面？

什么都不说java登录最简单代码了 直接给java登录最简单代码你代码吧\x0d\x0apackage com.moliying.ui;\x0d\x0aimport java.awt.BorderLayout;\x0d\x0aimport java.awt.Container;\x0d\x0aimport java.awt.FlowLayout;\x0d\x0aimport java.awt.List;\x0d\x0aimport java.awt.event.ActionEvent;\x0d\x0aimport java.awt.event.ActionListener;\x0d\x0aimport java.io.BufferedWriter;\x0d\x0aimport java.io.FileOutputStream;\x0d\x0aimport java.io.OutputStreamWriter;\x0d\x0aimport java.util.ArrayList;\x0d\x0aimport java.util.Arrays;\x0d\x0aimport javax.swing.JButton;\x0d\x0aimport javax.swing.JFrame;\x0d\x0aimport javax.swing.JLabel;\x0d\x0aimport javax.swing.JPanel;\x0d\x0aimport javax.swing.JPasswordField;\x0d\x0aimport javax.swing.JTextField;\x0d\x0apublic class Login {\x0d\x0aprivate JFrame frame = new JFrame("登录");\x0d\x0aprivate Container c = frame.getContentPane();\x0d\x0aprivate JTextField username = new JTextField();\x0d\x0aprivate JPasswordField password = new JPasswordField();\x0d\x0aprivate JButton ok = new JButton("确定");\x0d\x0aprivate JButton cancel = new JButton("取消");\x0d\x0apublic Login() {\x0d\x0aframe.setSize(300, 200);\x0d\x0aframe.setBounds(450, 300, 300, 200);\x0d\x0ac.setLayout(new BorderLayout());\x0d\x0ainitFrame();\x0d\x0aframe.setVisible(true);\x0d\x0a}\x0d\x0aprivate void initFrame() {\x0d\x0a// 顶部\x0d\x0aJPanel titlePanel = new JPanel();\x0d\x0atitlePanel.setLayout(new FlowLayout());\x0d\x0atitlePanel.add(new JLabel("系统管理员登录"));\x0d\x0ac.add(titlePanel, "North");\x0d\x0a// 中部表单\x0d\x0aJPanel fieldPanel = new JPanel();\x0d\x0afieldPanel.setLayout(null);\x0d\x0aJLabel a1 = new JLabel("用户名:");\x0d\x0aa1.setBounds(50, 20, 50, 20);\x0d\x0aJLabel a2 = new JLabel("密 码:");\x0d\x0aa2.setBounds(50, 60, 50, 20);\x0d\x0afieldPanel.add(a1);\x0d\x0afieldPanel.add(a2);\x0d\x0ausername.setBounds(110, 20, 120, 20);\x0d\x0apassword.setBounds(110, 60, 120, 20);\x0d\x0afieldPanel.add(username);\x0d\x0afieldPanel.add(password);\x0d\x0ac.add(fieldPanel, "Center");\x0d\x0a// 底部按钮\x0d\x0aJPanel buttonPanel = new JPanel();\x0d\x0abuttonPanel.setLayout(new FlowLayout());\x0d\x0abuttonPanel.add(ok);\x0d\x0abuttonPanel.add(cancel);\x0d\x0ac.add(buttonPanel, "South");\x0d\x0a\x0d\x0aok.addActionListener(new ActionListener() {\x0d\x0a\x0d\x0a@Override\x0d\x0apublic void actionPerformed(ActionEvent e) {\x0d\x0aSystem.out.println(username.getText().toString());\x0d\x0a}\x0d\x0a});\x0d\x0a\x0d\x0acancel.addActionListener(new ActionListener() {\x0d\x0a\x0d\x0a@Override\x0d\x0apublic void actionPerformed(ActionEvent e) {\x0d\x0aframe.setVisible(false);\x0d\x0a}\x0d\x0a});\x0d\x0a}\x0d\x0apublic static void main(String[] args) {\x0d\x0a//new Login();\x0d\x0a\x0d\x0aString ss = "abbabbbaabbbccba";\x0d\x0a\x0d\x0aSystem.out.println(ss.split("b").length);\x0d\x0a\x0d\x0a}\x0d\x0a}

Q3: java编写一个登陆和注册信息的源代码,最简单的就可以,不需要数据库的那种

你这个不用数据库真的是有点难搞

我写了个用集合存储的，你看看，能否帮上你

java.util.ListString list = new ArrayListString();

  list.add("qq=123");//存储的时候用（用户名=密码）的形式

  list.add("ww=456");

  

  String username = "qq";

  String password = "123";

  for (int i = 0; i  list.size(); i++) {

   String num = username +"="+password;

   if(num.equals(list.get(i))){

    System.out.println("登录成功");

    break;

   }

  }

Q4: java实现简单登录界面

自己写的比较规范的代码，都有注释:

import javax.swing.JFrame;//框架

import javax.swing.JPanel;//面板

import javax.swing.JButton;//按钮

import javax.swing.JLabel;//标签

import javax.swing.JTextField;//文本框

import java.awt.Font;//字体

import java.awt.Color;//颜色

import javax.swing.JPasswordField;//密码框

import java.awt.event.ActionListener;//事件监听

import java.awt.event.ActionEvent;//事件处理

import javax.swing.JOptionPane;//消息窗口

public class UserLogIn extends JFrame{

public JPanel pnluser;

public JLabel lbluserLogIn;

public JLabel lbluserName;

public JLabel lbluserPWD;

public JTextField txtName;

public JPasswordField pwdPwd;

public JButton btnSub;

public JButton btnReset;

public UserLogIn(){

pnluser = new JPanel();

lbluserLogIn = new JLabel();

lbluserName = new JLabel();

lbluserPWD = new JLabel();

txtName = new JTextField();

pwdPwd = new JPasswordField();

btnSub = new JButton();

btnReset = new JButton();

userInit();

}

public void userInit(){

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置关闭框架的同时结束程序

this.setSize(300,200);//设置框架大小为长300,宽200

this.setResizable(false);//设置框架不可以改变大小

this.setTitle("用户登录");//设置框架标题

this.pnluser.setLayout(null);//设置面板布局管理

this.pnluser.setBackground(Color.cyan);//设置面板背景颜色

this.lbluserLogIn.setText("用户登录");//设置标签标题

this.lbluserLogIn.setFont(new Font("宋体",Font.BOLD | Font.ITALIC,14));//设置标签字体

this.lbluserLogIn.setForeground(Color.RED);//设置标签字体颜色

this.lbluserName.setText("用户名:");

this.lbluserPWD.setText("密 码:");

this.btnSub.setText("登录");

this.btnReset.setText("重置");

this.lbluserLogIn.setBounds(120,15,60,20);//设置标签x坐标120,y坐标15,长60,宽20

this.lbluserName.setBounds(50,55,60,20);

this.lbluserPWD.setBounds(50,85,60,25);

this.txtName.setBounds(110,55,120,20);

this.pwdPwd.setBounds(110,85,120,20);

this.btnSub.setBounds(85,120,60,20);

this.btnSub.addActionListener(new ActionListener()//匿名类实现ActionListener接口

{

public void actionPerformed(ActionEvent e){

btnsub_ActionEvent(e);

}

}

);

this.btnReset.setBounds(155,120,60,20);

this.btnReset.addActionListener(new ActionListener()//匿名类实现ActionListener接口

{

public void actionPerformed(ActionEvent e){

btnreset_ActionEvent(e);

}

}

);

this.pnluser.add(lbluserLogIn);//加载标签到面板

this.pnluser.add(lbluserName);

this.pnluser.add(lbluserPWD);

this.pnluser.add(txtName);

this.pnluser.add(pwdPwd);

this.pnluser.add(btnSub);

this.pnluser.add(btnReset);

this.add(pnluser);//加载面板到框架

this.setVisible(true);//设置框架可显

}

public void btnsub_ActionEvent(ActionEvent e){

String name = txtName.getText();

String pwd = String.valueOf(pwdPwd.getPassword());

if(name.equals("")){

JOptionPane.showMessageDialog(null,"账号不能为空","错误",JOptionPane.ERROR_MESSAGE);

return;

}else if (pwd.equals("")){

JOptionPane.showMessageDialog(null,"密码不能为空","错误",JOptionPane.ERROR_MESSAGE);

return;

}else if(true){

this.dispose();

}else{

JOptionPane.showMessageDialog(null,"账号或密码错误","错误",JOptionPane.ERROR_MESSAGE);

return;

}

}

public void btnreset_ActionEvent(ActionEvent e){

txtName.setText("");

pwdPwd.setText("");

}

public static void main(String[] args){

new UserLogIn();

}

}

java登录最简单代码的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java简单登录界面代码、java登录最简单代码的信息别忘了在本站进行查找喔。