应用的还是web的啊..
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我给你写了个应用的哈
你在C盘建个test.txt文件
里面写
username:用户名（这里可以随便写哈）
password:同上哈
注意是要换行的哦。。
比如
username:tiger
password:tiger
然后你建个Login的类
然后把下面的代码弄进去
运行就是了
注意登陆的时候你文件里面设定的什么用户名和密码就输入什么哈
输入错误就会提示输入错误的
import java.io.BufferedReader;
import java.io.FileReader;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
/**
*
* @author thinkpad
*/
public class Login extends javax.swing.JFrame {
/** Creates new form Login */
private static String username;
private static String password;
public Login() {
initComponents();
try {
BufferedReader br = new BufferedReader(new FileReader("C:\\test.txt"));
username = br.readLine().split("\\:")[1];
password = br.readLine().split("\\:")[1];
System.out.println(username + password);
} catch(Exception e) {
e.printStackTrace();
}
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// editor-fold defaultstate="collapsed" desc="Generated Code"
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jPasswordField1 = new javax.swing.JPasswordField();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("宋体", 0, 18)); // NOI18N
jLabel1.setText("Login");
jLabel2.setText("Username:");
jLabel3.setText("Password:");
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});
jPasswordField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jPasswordField1ActionPerformed(evt);
}
});
jButton1.setText("Login");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("Reset");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(28, 28, 28)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2)
.addComponent(jLabel3))
.addGap(33, 33, 33)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jPasswordField1, 0, 0, Short.MAX_VALUE)
.addComponent(jTextField1, javax.swing.GroupLayout.DEFAULT_SIZE, 108, Short.MAX_VALUE)))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2))))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(101, 101, 101)
.addComponent(jLabel1)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 35, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2)))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// /editor-fold
private void jPasswordField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
this.jTextField1.setText("");
this.jPasswordField1.setText("");
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String inputUsername = this.jTextField1.getText();
String inputPassword = String.valueOf(this.jPasswordField1.getPassword());
if(inputUsername.equals(username) inputPassword.equals(password)) {
JOptionPane.showMessageDialog(this, "Login success!");
} else {
JOptionPane.showMessageDialog(this, "Login failed!");
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
JFrame.setDefaultLookAndFeelDecorated(true);
Login login = new Login();
login.setVisible(true);
login.setLocationRelativeTo(null);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPanel jPanel1;
private javax.swing.JPasswordField jPasswordField1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
代码已写完，但是由于字数问题无法粘贴上来。把你邮箱给我，我给你发过去。
你这里没有用文件也没有用数据库，注册的账号只能用一次，当程序关闭后，这个账号的数据就没有了。
建议使用文件或者数据库保存注册了的账号和密码。如果不是很清楚这两个东西，建议再向后面学习。
//Js中的验证
//检查旧密码
function checkOldPassword(){
var hasErr = false;
var form = document.getElementById("form");
//检查旧密码
if(form.oldpass.value.length 1){
document.getElementById("errPwd").innerHTML = "请输入您现在的密码";
document.getElementById("errPwd").style.display = "inline-block";
hasErr = true;
}else{
document.getElementById("errPwd").style.display = "none";
}
return hasErr;
}
//检查新密码
function checkNewPassword(){
var form = document.getElementById("form");
var errNewPwdMsg = "";
var hasErr = false;
if(form.password.value.length 1){
errNewPwdMsg = "请输入新密码";
}else if ( form.password.value == getSsn(form.username.value) || form.password.value == form.username.value){
errNewPwdMsg = "密码和用户名不能相同";
}else if( charAllSame(form.password.value) ){
errNewPwdMsg = "您的密码过于简单";
}else if(strlen(form.password.value)6 || strlen(form.password.value)16 ){
errNewPwdMsg = "正确的密码长度为6-16位";
}else if(strlen2(form.password.value)){
errNewPwdMsg = "新密码包含了非法字符";
}
else if (form.oldpass.value == form.password.value){
errNewPwdMsg = "新旧密码不能相同";
}
if(errNewPwdMsg != ""){
document.getElementById("errNewPwd").innerHTML = errNewPwdMsg;
document.getElementById("errNewPwd").style.display = "inline-block";
hasErr = true;
}else{
document.getElementById("errNewPwd").style.display = "none";
}
return hasErr;
}
//检查新密码确认
function checkNewPasswordConfirm(){
var form = document.getElementById("form");
var hasErr = false;
if(form.confirmPassword.value != form.password.value ){
document.getElementById("errNewConfirmPwd").innerHTML = "您两次输入的新密码不一致，请确认";
document.getElementById("errNewConfirmPwd").style.display = "inline-block";
hasErr = true;
}else{
document.getElementById("errNewConfirmPwd").style.display = "none";
}
return hasErr;
}
function checkdata(form) {
//检查旧密码
if(checkOldPassword()){
form.oldpass.focus();
return false;
}
//检查新密码
if(checkNewPassword()){
form.password.focus();
return false;
}
//检查新密码确认
if(checkNewPasswordConfirm()){
form.confirmPassword.focus();
return false;
}
public boolean register_user(int pass){
boolean flag=true; //在此处定义变量
do {
System.out.print("请输入用户名");
String na = scanner.next();
System.out.print("请输入密码");
String pas = scanner.next();
System.out.print("请再次输入密码");
String pa = scanner.next();
if (pa.equals(pas)){
System.out.println("注册成功你的账号为" + na + "你的密码为" + pa);
} else {
System.out.println("注册失败你2才输入的密码不一致,请重新输入");
flag=false;//如果失败改变标量的值
}
} while (!flag);
不需要return吧。。。
import java.awt.*;
import java.awt.event.*;
public class TestPassword {
public static void main(String[]args) {
MyTestFrame mf = new MyTestFrame("密码输入");
}
}
class MyTestFrame extends Frame {
Button b = new Button("确认");
TextField tf = new TextField(15);
public MyTestFrame(String str){
super(str);
tf.setEchoChar('*');
Panel p = new Panel();
p.setBackground(Color.BLACK);
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String str = tf.getText();
// System.out.println(str);
if(str.length()8) {
System.out.println("输入不能少于八位");
tf.setText("");
}
else {
if(str.matches("\\d*")) {
System.out.println("密码强度低 ");
}
if(str.matches("[a-z0-9]*")){
System.out.println("密码强度中 ");
}
if(str.matches("[a-zA-Z0-9]*")) {
System.out.println("密码强度高");
}
}
}
});
this.setLayout(new BorderLayout());
p.add(tf);
this.add(b,BorderLayout.EAST);
this.add(p,BorderLayout.CENTER);
pack();
this.setVisible(true);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
可费劲了 把课本又翻了一遍,正则表达式又复习了一下,gui也用上了
