本文实例讲述了java swing中jdialog实现用户登陆ui。分享给大家供大家参考，具体如下：
jdialog是一种对话框组件，它常常与joptionpane配合使用。joptionpane提供对话框内部的消息、按钮等内容，jdialog提供对话框窗体，提供模态/非模态等属性。jdialog与jframe在外观上的区别在于，它没有最大化/最小化按钮。如下图所示：
jdialog窗体
点击file-》connect之后弹出登陆窗口：
jframe窗体
在下面的demo中，演示了jdialog构造登录窗体，以及从窗体中获得数据的方法。
logindemostart.java
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package awtdemo;
import java.awt.borderlayout;
import java.awt.event.actionevent;
import java.awt.event.actionlistener;
import javax.swing.*;
/*
* @功能：使用jdialog构造登陆对话框，并获取登陆用户信息
* @版本：20150804
* @结构：logindemostart[主类，提供初始ui]，passwordchooser[提供登陆ui并获取用户信息]，user[保存用户信息]
*/
@suppresswarnings("serial")
class logindemostart extends jframe{
/*
* @功能：提供初始ui，并调用passwordchooser登陆界面
* @版本：20150804
*/
private jtextarea textarea;
private passwordchooser passwordchooser ;
public logindemostart(){
//构造菜单栏
jmenubar mbar = new jmenubar();
setjmenubar(mbar);
jmenu filemenu = new jmenu("file");
jmenuitem connectitem = new jmenuitem("connect");
connectitem.addactionlistener(new actionlistener(){
public void actionperformed(actionevent e) {
// todo auto-generated method stub
//if 1st time,construct a dialog
passwordchooser = new passwordchooser(logindemostart.this);
passwordchooser.setvisible(true);
if(passwordchooser.islogedin())
{
user u = passwordchooser.getuser();
textarea.append("username = " + u.getname() + ", password = " + new string(u.getpassword()) + "\n");
}
}
});
jmenuitem exititem = new jmenuitem("exit");
exititem.addactionlistener(new actionlistener() {
@override
public void actionperformed(actionevent e) {
// todo auto-generated method stub
system.exit(0);
}
});
mbar.add(filemenu);
filemenu.add(connectitem);
filemenu.add(exititem);
//添加文本区域
textarea = new jtextarea();
add(new jscrollpane(textarea), borderlayout.center);
//设置窗体属性
settitle("logindemostart - www.zzvips.com");
setsize(300,200);
setlocationrelativeto(null);
}
public static void main(string[] args) {
// todo auto-generated method stub
logindemostart logindemostart = new logindemostart();
logindemostart.setvisible(true);
}
}
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passwordchooser.java
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package awtdemo;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/*
* @功能：提供登陆ui并获取用户信息
* @版本：20150804
*/
@suppresswarnings("serial")
class passwordchooser extends jdialog{
private jtextfield username ;
private jpasswordfield password ;
private jbutton okbutton ;
private jbutton cancelbutton ;
private boolean islogedin = false;
public passwordchooser(frame parent){
super(parent, true);
//本ui包含2个panel
jpanel inputpanel = new jpanel();
jpanel buttonpanel = new jpanel();
//构造inputpanel
inputpanel.setlayout(new gridlayout(2,2));
inputpanel.add(new jlabel("useername:"));
username = new jtextfield();
username.setcolumns(10);
password = new jpasswordfield();
password.setcolumns(10);
inputpanel.add(username);
inputpanel.add(new jlabel("password:"));
inputpanel.add(password);
inputpanel.setborder(borderfactory.createemptyborder(10, 5, 10, 5));
//构造buttonpanel
okbutton = new jbutton("ok");
okbutton.addactionlistener(new actionlistener() {
@override
public void actionperformed(actionevent e) {
// todo auto-generated method stub
islogedin = true;
setvisible(false);
}
});
cancelbutton = new jbutton("cancel");
cancelbutton.addactionlistener(new actionlistener() {
@override
public void actionperformed(actionevent e) {
// todo auto-generated method stub
setvisible(false);
}
});
buttonpanel.add(okbutton);
buttonpanel.add(cancelbutton);
buttonpanel.setborder(borderfactory.createemptyborder(10, 5, 10, 5));
//构造主框架
setlayout(new borderlayout());
getcontentpane().add(inputpanel, borderlayout.north);
getcontentpane().add(buttonpanel, borderlayout.south);
//设置窗体属性
settitle("passwordchooser - www.zzvips.com");
setlocationrelativeto(inputpanel);
//setpreferredsize(new dimension(300, 200));
pack();
//system.out.println(getpreferredsize());
}
public void setuser(user u){
username.settext(u.getname());
}
public user getuser(){
return new user(username.gettext(), password.getpassword());
}
public boolean islogedin(){
return islogedin;
}
public static void main(string[] args) {
// todo auto-generated method stub
}
}
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user.java
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package awtdemo;
/*
* @功能：保存用户信息
* @版本：20150804
*/
class user{
private string name;
private char[] password;
public user(string aname, char[] apassword){
name = aname;
password = apassword;
}
public string getname(){
return name;
}
public char[] getpassword(){
return password;
}
public void setname(string aname){
name = aname;
}
public void setpassword(char[] apassword){
password = apassword;
}
}
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希望本文所述对大家java程序设计有所帮助。
原文链接：http://www.cnblogs.com/pzy4447/p/4701753.html