java语言图形用户登录界面代码

本文实例为大家分享了java登录界面的具体实现代码，供大家参考，具体内容如下

1. login.java

package wzb;
 
import java.awt.color;
import java.awt.font;
import java.awt.graphics;
import java.awt.panel;
import java.awt.event.actionevent;
import java.awt.event.actionlistener;
import java.awt.event.keyevent;
import java.util.random;
 
import javax.swing.imageicon;
import javax.swing.jbutton;
import javax.swing.jframe;
import javax.swing.jlabel;
import javax.swing.joptionpane;
import javax.swing.jpasswordfield;
import javax.swing.jtextfield;
 
public class login extends jframe implements actionlistener {
 string username;
 string password;
 string captcha;
 public static string randomcaptcha;
 
 public jlabel logolabel, usernamelabel, passwordlabel, captchalabel;
 public jtextfield usernameinput, captchainput;
 public jpasswordfield passwordinput;
 public jbutton login, logout,change;
 public panel panel;
 
 public login() {
  settitle("µçâ¼½çãæ");
  setsize(400, 300);
  setlocationrelativeto(null);
  init();
  setvisible(true);
  setdefaultcloseoperation(jframe.exit_on_close);
  setresizable(false);
 }
 
 public void init() {
  setlayout(null);
  // logolabel= new jlabel();
  // logolabel.seticon(new imageicon("e:\\eclipse\\student3\\welcome.gif"));
  logolabel = new jlabel(new imageicon("welcome.gif"));
  logolabel.setbounds(125, 10, 150, 70);
  add(logolabel);
 
  usernamelabel = new jlabel("ó㻧ãû:");
  usernamelabel.setbounds(90, 90, 60, 40);
  add(usernamelabel);
  usernameinput = new jtextfield();
  usernameinput.setbounds(150, 100, 150, 20);
  add(usernameinput);
 
  passwordlabel = new jlabel("ãü¡¡âë:");
  passwordlabel.setbounds(90, 120, 60, 40);
  add(passwordlabel);
  passwordinput = new jpasswordfield();
  passwordinput.setbounds(150, 130, 150, 20);
  add(passwordinput);
 
  captchalabel = new jlabel("ñéö¤âë:");
  captchalabel.setbounds(90, 150, 60, 40);
  add(captchalabel);
  captchainput = new jtextfield();
  captchainput.setbounds(150, 160, 70, 20);
  add(captchainput);
 
  panel = new paneldemo();
  panel.setbounds(220, 160, 80, 20);
  add(panel);
   
   
  change = new jbutton("»»ò»»»");
  change.setbounds(300, 160, 80, 20);
  change.setcontentareafilled(false);
  change.setborderpainted(false);
  add(change);
 
  login = new jbutton("µçâ¼£¨l£©", new imageicon("login.gif"));
  login.setbounds(70, 200, 120, 30);
  login.setmnemonic(keyevent.vk_l);
  add(login);
  logout = new jbutton("íë³ö£¨x£©", new imageicon("exit.gif"));
  logout.setbounds(210, 200, 120, 30);
  logout.setmnemonic(keyevent.vk_x);
  add(logout);
 
  usernameinput.addactionlistener(this);
  passwordinput.addactionlistener(this);
  captchainput.addactionlistener(this);
 
  login.addactionlistener(this);
  logout.addactionlistener(this);
  change.addactionlistener(this);
 }
 
 public void actionperformed(actionevent e) {
 
  username = usernameinput.gettext();
  password = new string(passwordinput.getpassword());
  captcha = captchainput.gettext();
   
  if (e.getsource() == change) {
   panel.repaint();
  }
  if (e.getsource() == login) {
   if ((username.equals("w")) && (password.equals("w"))) {
    if (captcha.equals(randomcaptcha)) {
     joptionpane.showmessagedialog(this, "»¶ó­µçâ½!");
    } else {
     joptionpane.showmessagedialog(this, "ñéö¤âë´íîó!");
     panel.repaint();
    }
   } else {
    joptionpane.showmessagedialog(this, "ó㻧ãû»òãüâë´íîó!");
   }
  }
  if (e.getsource() == logout) {
   joptionpane.showmessagedialog(this, "»¶ó­ïâ´îôùà´£¡");
   //system.exit(0);
   dispose();
  }
 }
 public static void main(string[] args) {
  new login();
 }
}
class paneldemo extends panel {
 
 public void paint(graphics g) {
  int width = 80;
  int height = 20;
  g.setcolor(color.light_gray);
  g.fillrect(0, 0, width, height);
  g.setcolor(color.black);
  g.drawrect(0, 0, width, height);
  random rd = new random();
  for (int i = 0; i < 100; i++) {
   int x = rd.nextint(width) - 2;
   int y = rd.nextint(height) - 2;
   g.setcolor(color.red);
   g.drawoval(x, y, 2, 2);
  }
  g.setfont(new font("ºúìå", font.bold, 20));
  g.setcolor(color.blue);
  char[] c = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789".tochararray();
  stringbuffer sb = new stringbuffer();
  for (int i = 0; i < 4; i++) {
   int index = rd.nextint(c.length);
   sb.append(c[index] + " ");
  }
  g.drawstring(sb.tostring(), 0, 18);
 
  string str = sb.tostring().replaceall(" ", "");
  login.randomcaptcha = str;
 }
}

2. 捕获.png   

以上就是本文的全部内容，希望对大家学习java程序设计有所帮助。