Java Swing中JDialog实现用户登陆UI示例

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

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.jb51.net");
    setsize(300,200);
    setlocationrelativeto(null);
  }
  public static void main(string[] args) {
    // todo auto-generated method stub
    logindemostart logindemostart = new logindemostart();
    logindemostart.setvisible(true);
  }
}

passwordchooser.java

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.jb51.net");
    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
  }
}

user.java

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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