用java做QQ登录界面的写法如下：

package ch10

import java.awt.*

import java.awt.event.*

import javax.swing.*

1、//定义该类继承自JFrame，实现ActionListener接口

public class LoginTest extends JFrame implements ActionListener

{

2、//创建JPanel对象

private JPanel jp=new JPanel()

3、//创建3个标并加入数组

JLabel name = new JLabel("请输入用户名")

JLabel password = new JLabel("请输入密码")

JLabel show = new JLabel("")

private JLabel[] jl={name,password,show}

4、//创建登陆和重置按扭并加入数组

JButton login = new JButton("登陆")

JButton reset = new JButton("重置")

private JButton[] jb={login,reset}

5、//创建文本框以及密码框

private JTextField jName=new JTextField()

private JPasswordField jPassword =new JPasswordField()

public LoginTest()

{

6、//设置布局管理器为空布局，这里自己摆放按钮、标签和文本框

jp.setLayout(null)

for(int i=0i<2i++)

{

7、//设置标签和按扭的位置与大小

jl[i].setBounds(30,20+40*i,180,20)

jb[i].setBounds(30+110*i,100,80,20)

8、//添加标签和按扭到JPanel容器中

jp.add(jl[i])

jp.add(jb[i])

//为2个按钮注册动作事件监听器

jb[i].addActionListener(this)

}

9、//设置文本框的位置和大小，注意满足美观并足够用户名的长度

jName.setBounds(130,15,100,20)

10、//添加文本框到JPanel容器中

jp.add(jName)

11、//为文本框注册动作事件监听器

jName.addActionListener(this)

12、//设置密码框的位置和大小，注意满足美观和足够密码的长度

jPassword.setBounds(130,60,100,20)

13、//添加密码框到JPanel容器中

jp.add(jPassword)

14、//设置密码框中的回显字符，这里设置美元符号

jPassword.setEchoChar('$')

15、//为密码框注册动作事件监听器

jPassword.addActionListener(this)

16、//设置用于显示登陆状态的标签大小位置，并将其添加进JPanel容器

jl[2].setBounds(10,180,270,20)

jp.add(jl[2])

17、//添加JPanel容器到窗体中

this.add(jp)

18、//设置窗体的标题、位置、大小、可见性及关闭动作

this.setTitle("登陆窗口")

this.setBounds(200,200,270,250)

this.setVisible(true)

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

}

19、//实现动作监听器接口中的方法actionPerformed

public void actionPerformed(ActionEvent e)

{

20、//如果事件源为文本框

if(e.getSource()==jName)

{

21、//切换输入焦点到密码框

jPassword.requestFocus()

}

22、//如果事件源为重置按扭

else if(e.getSource()==jb[1])

{

23、//清空姓名文本框、密码框和show标签中的所有信息

jl[2].setText("")

jName.setText("")

jPassword.setText("")

24、//让输入焦点回到文本框

jName.requestFocus()

}

25、//如果事件源为登陆按钮，则判断登录名和密码是否正确

else

{

26、//判断用户名和密码是否匹配

if(jName.getText().equals("lixiangguo")&&

String.valueOf(jPassword.getPassword()).equals("19801001"))

{

27、jl[2].setText("登陆成功，欢迎您的到来！")

}

else

{

28、jl[2].setText("对不起，您的用户名或密码错误！")

}

}

}

public static void main(String[] args)

{

29、//创建LoginTest窗体对象

new LoginTest()

}

}

什么都不说了 直接给你代码吧\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}

importjava.awt.*\x0d\x0aimportjava.awt.event.*\x0d\x0aimportjava.applet.*\x0d\x0aimportjava.applet.Applet\x0d\x0aimportjava.io.*\x0d\x0aimportjavax.xml.parsers.DoumentBuilderFactory\x0d\x0a\x0d\x0apublicclassUserPanelextendsAppletimplentsActionListener\x0d\x0a{\x0d\x0aLabellblName,lblNumber,lblSex,lblJob,lblText\x0d\x0aTextFieletfName.tfNumber\x0d\x0acheckboxchMale,chFemale\x0d\x0aTextAreataText\x0d\x0achoicechJob\x0d\x0aButtonbtnOk,btnDisply\x0d\x0aPanelp1,p2,p3,p4,p5,p6,p7,p8,p9\x0d\x0aStringstrName,strNumber,strSex,strJob,strText\x0d\x0a\x0d\x0apublicvoidinit()\x0d\x0a{\x0d\x0alblName=newLabel("姓名")\x0d\x0alblNumber=newLabel("身份证号")\x0d\x0alblSex=newLabel("性别")\x0d\x0alblJob=newLabel("职业")\x0d\x0alblText=newLabel("个性化宣言")\x0d\x0atfName=newTextField(23)\x0d\x0atfNumber=newTextFidle(20)\x0d\x0ataText=newTextArea(10,20)\x0d\x0ac=newcheckboxGroup()\x0d\x0achMale=newcheckbox("男",c,true)\x0d\x0achFemale=newcheckbox("女",c,false)\x0d\x0achJob=newchoice()\x0d\x0achJob.add("学生")\x0d\x0abtnOk=newButton("确定")\x0d\x0abtnDisplay=newButton("显示")\x0d\x0ap1=newpanel()\x0d\x0ap2=newpanel()\x0d\x0ap3=newpanel()\x0d\x0ap4=newpanel()\x0d\x0ap5=newpanel()\x0d\x0ap6=newpanel()\x0d\x0ap7=newpanel(newBorderLayout())\x0d\x0ap8=newpanel()\x0d\x0ap9=newpanel(newBorderLayout())\x0d\x0a//\x0d\x0ap1.add(lblName)\x0d\x0ap1.add(tfName)\x0d\x0ap2.add(lblNumber)\x0d\x0ap2.add(lblNumber)\x0d\x0ap3.add(lblSex)\x0d\x0ap3.add(chMale)\x0d\x0ap3.add(chFemale)\x0d\x0ap4.add(lblJob)\x0d\x0ap4.add(chJob)\x0d\x0ap5.add(p3)\x0d\x0ap5.add(p4)\x0d\x0ap6.setLayout(newBorderLayout())\x0d\x0ap6.add(p1,BorderLayout.NORTH)\x0d\x0ap6.add(p2,BorderLayout.CENTER)\x0d\x0ap6.add(p5,BorderLayout.SOUTH)\x0d\x0ap7.add(lblText,BorderLayout.NORTH)\x0d\x0ap7.add(lblText,BorderLayout.CENTER)\x0d\x0ap8.setLayout(newFlowLayout(FlowLayout.CENTER,30,10))\x0d\x0ap8.add(btnOK)\x0d\x0ap8.add(btnDisplay)\x0d\x0ap9.add(p6,BorderLayout.NORTH)\x0d\x0ap9.add(p7,BorderLayout.CENTER)\x0d\x0ap9.add(p8,BorderLayout.SOUTH)\x0d\x0aadd(p9)\x0d\x0a//\x0d\x0abtnOK.addActionListener(this)\x0d\x0abtnDisplay.addActionListener(this)\x0d\x0abtnDisplay.setEnabled(false)\x0d\x0astrName=newString()\x0d\x0astrNumber=newString()\x0d\x0astrSex=newString()\x0d\x0astrJob=newString()\x0d\x0astrText=newString()\x0d\x0a}\x0d\x0a\x0d\x0apublicvoidactionPerformed(ActionEventevt)\x0d\x0a{\x0d\x0astringarg=evt.getActionCommand()\x0d\x0a//\x0d\x0aif(arg.equals("确定"))\x0d\x0a{\x0d\x0astrName=tfName.getText().trim()\x0d\x0astrNumber=tfNumber.getText().trim()\x0d\x0aif(chMale.getState())\x0d\x0astrSex="男"\x0d\x0aelse\x0d\x0astrSex="女"\x0d\x0astrJob=chJob.getselectedItem()\x0d\x0astrText=taText.getText().trim()\x0d\x0atry\x0d\x0a{\x0d\x0a//\x0d\x0aDoumentBuildFactorydbf=DocumentBuilderFactory.newInstance()\x0d\x0adb=dbf.newDocumentBuilder()\x0d\x0aDoumentdoc=db.newDoument()\x0d\x0a//\x0d\x0aElementroot=doc.CreateElement("UserDAta")\x0d\x0aElementeName=doc.createElement("Name")\x0d\x0aElementeNumber=doc.createElement("Number")\x0d\x0aElementeJob=doc.createElement("Job")\x0d\x0aElementeText=doc.createElement("Text")\x0d\x0a//\x0d\x0aroot.appendChild(eName)\x0d\x0aroot.appendChild(eNumber)\x0d\x0aroot.appendChild(eSex)\x0d\x0aroot.appendChild(eJob)\x0d\x0aroot.appendChild(eText)\x0d\x0a//\x0d\x0aeName.appendChild(doc.creatTextNode("\n"strName"\n"))\x0d\x0aeNumber.appendChild(doc.creatTextNode("\n"strNumber"\n"))\x0d\x0aeSex.appendChild(doc.creatTextNode("\n"strSex"\n"))\x0d\x0aeJob.appendChild(doc.creatTextNode("\n"strJob"\n"))\x0d\x0aeText.appendChild(doc.creatTextNode("\n"strText"\n"))\x0d\x0a//\x0d\x0aFilef=newFile("user.xml")\x0d\x0aFileOutputStreamfOut=newFileOutStream(f)\x0d\x0a//\x0d\x0afOut.write("

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