文档监听器的问题....(高手来..)(页 1) - JAVA论坛 - J2SE论坛 - 编程论坛

y218z903 发表于 2008-5-26 20:01

文档监听器的问题....(高手来..)

JLabel idlb=new JLabel("用户名");
 JTextField idtxt=new JTextField();
 txtListener txtlistener=new txtListener();
idtxt.getDocument().addDocumentListener(txtlistener);
 idlab=new JLabel(); //[color=Red]主要是用于注册时,提醒的..[/color]
private class txtListener implements DocumentListener
{
public void insertUpdate(DocumentEvent e)
{
 str=idtxt.getText(); //[color=Red]会发生异常! 而且很变态[/color]
 int i=str.length();
 if(i<8)
 idlab.setText("账号过短");
 }
public void removeUpdate(DocumentEvent e)
{
str=idtxt.getText();
 int i=str.length();
 if(i<8)
idlab.setText("字符过长!");
}
public void changedUpdate(DocumentEvent e)
{

}

String str;
} //[color=Red]主要是用于注册时,提醒的..[/color]

[[it] 本帖最后由 y218z903 于 2008-5-26 20:02 编辑 [/it]]

[[it] 本帖最后由 y218z903 于 2008-5-27 14:13 编辑 [/it]]

y218z903 发表于 2008-5-28 13:57

汗...没人啊....来个高手啊....

sunkaidong 发表于 2008-5-28 14:11

你把贴全了吧...如果有问题应该是里面没有应用导致的...我的猜测

y218z903 发表于 2008-5-28 16:59

这是异常

--------------------配置: <--------------------
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at LoginFrame$txtListener.insertUpdate(Login.java:248)
at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:185)
at javax.swing.text.AbstractDocument.handleInsertString(AbstractDocument.java:734)
at javax.swing.text.AbstractDocument.insertString(AbstractDocument.java:693)
at javax.swing.text.PlainDocument.insertString(PlainDocument.java:114)
at javax.swing.text.AbstractDocument.replace(AbstractDocument.java:655)
at javax.swing.text.JTextComponent.replaceSelection(JTextComponent.java:1351)
at javax.swing.text.DefaultEditorKit$DefaultKeyTypedAction.actionPerformed(DefaultEditorKit.java:859)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2849)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2884)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2812)
at java.awt.Component.processEvent(Component.java:5818)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4413)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:697)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:962)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:834)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
at java.awt.Component.dispatchEventImpl(Component.java:4285)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Window.dispatchEventImpl(Window.java:2440)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

y218z903 发表于 2008-5-28 17:02

这是全部内容,谢谢了

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.util.*;
public class Login
{
public static void main(String args[])
{
LoginFrame frame=new LoginFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// frame.setResizable(false);
frame.setVisible(true);

}
}
class LoginFrame extends JFrame
{
public LoginFrame()
{
setTitle("注册");
Toolkit kit=Toolkit.getDefaultToolkit();
Dimension screen=kit.getScreenSize();
// setBounds(screen.width/4,screen.height/4,screen.width/2,screen.height/2);
 setSize(screen.width,screen.height);
Image img=kit.getImage("1.jpg");
setIconImage(img);
GridBagLayout layout=new GridBagLayout();
JPanel panel=new JPanel();

add(panel);
Icon icon = new ImageIcon ("2.jpg");
 panel.setBorder(new MatteBorder(200, 400, 200, 400, icon));
panel.setLayout(layout);
//添加用户名
JLabel idlb=new JLabel("用户名");
JTextField idtxt=new JTextField("fff");
txtListener txtlistener=new txtListener();
idtxt.getDocument().addDocumentListener(txtlistener);
 idlab=new JLabel();

// idtxt.Maxlength=10;
 //添加用户密码
JLabel pw1lb=new JLabel("用户密码");
JPasswordField pw1txt=new JPasswordField();
JLabel pw1lab=new JLabel();
pw1txt.setEchoChar('★');
// pw1txt.setPreferredSize(new Dimension(200, 21));

//添加确认密码
JLabel pw2lb=new JLabel("确认密码");
JPasswordField pw2txt=new JPasswordField();
JLabel pw2lab=new JLabel();
pw2txt.setEchoChar('★');
// pw2txt.setMaximumSize(pw2txt.getPreferredSize());

//添加姓名
JLabel nmlb=new JLabel("姓名");

JTextField nmtxt=new JTextField();
JLabel nmlab=new JLabel();

//添加性别
JLabel sexlb=new JLabel("性别");
 JPanel sexPanel=new JPanel();
ButtonGroup sex=new ButtonGroup();
JRadioButton manbt=new JRadioButton("男");
manbt.setSelected(true);
JRadioButton wmanbt=new JRadioButton("女");
sexPanel.add(manbt);
sexPanel.add(wmanbt);
sexPanel.setBorder(BorderFactory.createEtchedBorder());
sex.add(manbt);sex.add(wmanbt);
JLabel sexlab=new JLabel();

//添加年龄
JLabel agelb=new JLabel("年龄");
int MINY=1900;
 int MINM=1;
 int MIND=1;
int MAXY=2008;
int MAXM=12;
int MAXD=31;

JPanel agePanel=new JPanel();
JLabel ageY=new JLabel("年");
JLabel ageM=new JLabel("月");
JLabel ageD=new JLabel("日");
String ageYE[]=new String[MAXY-MINY+1];
String ageMO[]=new String[MAXM];

yearListener ylistener=new yearListener();
for(int j=0;MAXY>=MINY;j++)
ageYE[j]=String.valueOf(MAXY--);
for(int j=0;MINM<=MAXM;j++)
ageMO[j]=String.valueOf(MINM++);
 ageYCombo=new JComboBox(ageYE);
 ageYCombo.setSelectedItem("1987");
 ageMCombo=new JComboBox(ageMO);
 ageMCombo.setSelectedItem("9");

 ageYCombo.addActionListener(ylistener);
 ageMCombo.addActionListener(ylistener);

 String ageDA[]=new String[MAXD];
 for(int j=0;MIND<=MAXD;j++)
 ageDA[j]=String.valueOf(MIND++);
 ageDCombo=new JComboBox(ageDA);

 ageDCombo.setSelectedItem("3");
 JLabel agelab=new JLabel();
agePanel.add(ageYCombo);agePanel.add(ageY);
agePanel.add(ageMCombo);agePanel.add(ageM);
agePanel.add(ageDCombo);agePanel.add(ageD);


 //添加班级
 JLabel cllb=new JLabel("班级");
 JComboBox clCombo=new JComboBox(new String []{"06大专网络","06物流1班","06大专财会","06大专软件"});
 JLabel cllab=new JLabel();
 //添加身份证
 JLabel Pidlb=new JLabel("身份证");
 JTextField Pidtxt=new JTextField("36048119870");
 JLabel Pidlab=new JLabel();

 //添加家庭住址
 JLabel adrlb=new JLabel("家庭住址");
 JTextField adrtxt=new JTextField("江西省瑞昌市白杨镇黄桥十五组");
 JLabel adrlab=new JLabel();

 //添加命令按钮
 JButton okbt= new JButton("提交");
 JButton cancelbt=new JButton("取消");

 //添加评分
 JLabel grlb=new JLabel("<html>请给该窗体打分</html>");
 JSlider grsid=new JSlider(0,100,90);
 JLabel grlab=new JLabel();
 grsid.setMajorTickSpacing(20);
 grsid.setMinorTickSpacing(5);
 grsid.setPaintTicks(true);
 grsid.setSnapToTicks(true);
 grsid.setPaintLabels(true);
 // 添加到窗体
 panel.add(idlb,new GBC(0,0,1,1).setAnchor(GBC.WEST).setInsets(1));
 panel.add(idtxt,new GBC(1,0,1,1).setFill(GBC.HORIZONTAL).setInsets(4));
 panel.add(idlab,new GBC(2,0,1,1).setAnchor(GBC.EAST).setInsets(1));

 panel.add(pw1lb,new GBC(0,1,1,1).setAnchor(GBC.WEST));
 panel.add(pw1txt,new GBC(1,1,1,1).setFill(GBC.HORIZONTAL).setInsets(4));
 panel.add(pw1lab,new GBC(2,1,1,1).setAnchor(GBC.EAST).setInsets(1));

 panel.add(pw2lb,new GBC(0,2,1,1).setAnchor(GBC.WEST));
 panel.add(pw2txt,new GBC(1,2,1,1).setFill(GBC.BOTH).setInsets(4));
 panel.add(pw2lab,new GBC(2,2,1,1).setFill(GBC.BOTH).setAnchor(GBC.EAST).setInsets(1));

 panel.add(nmlb,new GBC(0,3,1,1).setAnchor(GBC.WEST));
 panel.add(nmtxt,new GBC(1,3,1,1).setFill(GBC.BOTH).setInsets(4));
 panel.add(nmlab,new GBC(2,3,1,1).setFill(GBC.BOTH).setAnchor(GBC.EAST).setInsets(1));

 panel.add(sexlb,new GBC(0,4,1,1).setAnchor(GBC.WEST));
 panel.add(sexPanel,new GBC(1,4,1,1).setFill(GBC.BOTH).setAnchor(GBC.CENTER));
 panel.add(sexlab,new GBC(2,4,1,1).setFill(GBC.BOTH).setAnchor(GBC.EAST).setInsets(1));

 panel.add(agelb,new GBC(0,5,1,1).setAnchor(GBC.WEST));
 panel.add(agePanel,new GBC(1,5,1,1).setFill(GBC.BOTH).setInsets(4));
 panel.add(agelab,new GBC(2,5,1,1).setFill(GBC.BOTH).setAnchor(GBC.EAST).setInsets(1));

 panel.add(cllb,new GBC(0,6,1,1).setAnchor(GBC.WEST));
 panel.add(clCombo,new GBC(1,6,1,1).setFill(GBC.BOTH).setInsets(4));
 panel.add(cllab,new GBC(2,6,1,1).setFill(GBC.BOTH).setAnchor(GBC.EAST).setInsets(1));

 panel.add(Pidlb,new GBC(0,7,1,1).setAnchor(GBC.WEST));
 panel.add(Pidtxt,new GBC(1,7,1,1).setFill(GBC.BOTH).setInsets(4));
 panel.add(Pidlab,new GBC(2,7,1,1).setAnchor(GBC.EAST).setInsets(1));

 panel.add(adrlb,new GBC(0,8,1,1).setAnchor(GBC.WEST));
 panel.add(adrtxt,new GBC(1,8,1,1).setFill(GBC.BOTH).setInsets(4));
 panel.add(adrlab,new GBC(2,8,1,1).setFill(GBC.BOTH).setAnchor(GBC.EAST).setInsets(1));

 panel.add(grlb,new GBC(0,9,1,1).setAnchor(GBC.WEST));
 panel.add(grsid,new GBC(1,9,1,1).setFill(GBC.BOTH).setInsets(4));
 panel.add(grlab,new GBC(2,9,1,1).setAnchor(GBC.EAST).setInsets(1));

 panel.add(okbt,new GBC(0,10,1,1).setAnchor(GBC.SOUTH).setInsets(4));
 panel.add(cancelbt,new GBC(1,10,2,1).setAnchor(GBC.SOUTH).setInsets(4));
}
private class yearListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
 stry=Integer.parseInt((String)ageYCombo.getSelectedItem());
strm=Integer.parseInt((String)ageMCombo.getSelectedItem());
 if(tag1)
 {
 ageDCombo.addItem("31");
 tag1=false;
 }
 if(tag2)
 {
 ageDCombo.addItem("30");
 ageDCombo.addItem("31");
 tag2=false;
 }
 if(tag3)
 {
 ageDCombo.addItem("29");
 ageDCombo.addItem("30");
 ageDCombo.addItem("31");
 tag3=false;
 }
 if(strm==4||strm==6||strm==9||strm==11)
 {
 ageDCombo.removeItem("31");
 tag1=true;
 }
 if(((stry%4==0&&stry%100!=0)||stry%400==0)&&strm==2)
 {
 ageDCombo.removeItem("31");
 ageDCombo.removeItem("30");
 tag2=true;
 }
 if(!((stry%4==0&&stry%100!=0)||stry%400==0)&&strm==2)
 {
 ageDCombo.removeItem("31");
 ageDCombo.removeItem("30");
 ageDCombo.removeItem("29");
 tag3=true;
 }
 }
boolean tag1=false;
boolean tag2=false;
boolean tag3=false;
int stry=1990;
int strm=1;
}

[color=Red]private class txtListener implements DocumentListener
{
public void insertUpdate(DocumentEvent e)
{
 str=idtxt.getText();
 int i=str.length();
 if(i<8)
 idlab.setText("<html>！字符过短!</color></html>");
 if(i>16)
 idlab.setText("<html>！字符过短!</color></html>");
 }
public void removeUpdate(DocumentEvent e)
{
/* str=idtxt.getText();
 int i=str.length();
 if(i<8)
 idlab.setText("<html>！字符过短!</color></html>");
 if(i>16)
*/ idlab.setText("<html>！字符过短!</color></html>");
}
public void changedUpdate(DocumentEvent e)
{

}

String str;
}[/color]
private JComboBox ageYCombo;
private JComboBox ageMCombo;
private JTextField idtxt;
private JLabel idlab;
private JLabel pw1lab;
private JLabel pw2lab;
private JLabel Pidlab;
private JLabel grlab;
private JComboBox ageDCombo;

}

[[it] 本帖最后由 y218z903 于 2008-5-28 17:04 编辑 [/it]]

y218z903 发表于 2008-5-28 17:03

GBC是辅助类..

GBC是辅助类..红色的地方出问题... 其它到没什么问题

[[it] 本帖最后由 y218z903 于 2008-5-28 17:05 编辑 [/it]]

sunkaidong 发表于 2008-5-28 18:29

没什么问题...可能不支持html标签..还有你做文本检测太麻烦了

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
class Login
{
 public static void main(String args[])
 {
 LoginFrame frame=new LoginFrame();
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// frame.setResizable(false);
 frame.setVisible(true);

 }
}
class LoginFrame extends JFrame
{
 public LoginFrame()
 {
 setTitle("注册");
 Toolkit kit=Toolkit.getDefaultToolkit();
 Dimension screen=kit.getScreenSize();
 // setBounds(screen.width/4,screen.height/4,screen.width/2,screen.height/2);
 setSize(screen.width/4,screen.height/4);
 Image img=kit.getImage("1.jpg");
 setIconImage(img);
 FlowLayout layout=new FlowLayout();
 JPanel panel=new JPanel();
 add(panel);
 idtxt=new JTextField(10);
 js=new JTextField(10);
 idtxt.getDocument().addDocumentListener(new txtListener());
 panel.add(idtxt);
 panel.add(js);
 }



private class txtListener implements DocumentListener
{
 public void insertUpdate(DocumentEvent e)
 {
 str=idtxt.getText();
 int i=str.length();
 if(i<8)
 js.setText("字符串太短");
 if(i>16)
 js.setText("字符串太长");
 }
 public void removeUpdate(DocumentEvent e)
 {
 str=idtxt.getText();
 int i=str.length();
 if(i<8)
 js.setText("字符串太短");
 if(i>16)
 js.setText("字符串太长");
 }
 public void changedUpdate(DocumentEvent e)
 {

 }

 String str;
}
 private JTextField idtxt;
 private JTextField js;

}

sunkaidong 发表于 2008-5-28 18:43

这个是标签的

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
class Login
{
 public static void main(String args[])
 {
 LoginFrame frame=new LoginFrame();
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// frame.setResizable(false);
 frame.setVisible(true);

 }
}
class LoginFrame extends JFrame
{
 public LoginFrame()
 {
 setTitle("注册");
 Toolkit kit=Toolkit.getDefaultToolkit();
 Dimension screen=kit.getScreenSize();
 // setBounds(screen.width/4,screen.height/4,screen.width/2,screen.height/2);
 setSize(screen.width/4,screen.height/4);
 Image img=kit.getImage("1.jpg");
 setIconImage(img);
 FlowLayout layout=new FlowLayout();
 JPanel panel=new JPanel();
 add(panel);
 idtxt=new JTextField(10);
 //js=new JTextField(10);
 js=new JLabel();
 idtxt.getDocument().addDocumentListener(new txtListener());
 panel.add(idtxt);
 panel.add(js);


 }



private class txtListener implements DocumentListener
{
 public void insertUpdate(DocumentEvent e)
 {
 str=idtxt.getText();
 int i=str.length();
 if(i<8)
 js.setText("<html>！字符过短!</color></html>");
 if(i>16)
 js.setText("<html>！字符太长!</color></html>");
 }
 public void removeUpdate(DocumentEvent e)
 {
 str=idtxt.getText();
 int i=str.length();
 if(i<8)
 js.setText("<html>！字符过短!</color></html>");
 if(i>16)
 js.setText("<html>！字符太长!</color></html>");
 }
 public void changedUpdate(DocumentEvent e)
 {

 }

 String str;
}
 private JTextField idtxt;
 private JLabel js;

}

y218z903 发表于 2008-5-28 21:03

HTMl,完全是后来才加上去的...去了HTML也是一样...

sunkaidong 发表于 2008-5-28 21:48

我修改后不存在问题啊...你看看呢..有什么问题我们再讨论

y218z903 发表于 2008-5-29 08:40

奇怪.... 还真没问题.... 难道是布局的问题?

y218z903 发表于 2008-5-31 20:08

找到错误的根源了..

主要是没注意,先定义为域变量后,又定义为了局部变量,..所以才...

谢谢 <sunkaidong>

页: [1]

编程论坛's Archiver