java代码写日记本功能 Java 实现日记软件

用java编写一个“我的日记”的界面并使其实现写日记的功能， 最好含有登陆界面的

代码如下，自己测试哦

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import java.awt.event.ActionListener;

import javax.swing.*;

import java.awt.*;

import java.awt.Color;

import java.awt.event.ActionEvent;

import javax.swing.tree.*;

import javax.swing.event.*;

import java.io.*;

import java.util.*;

import javax.swing.JColorChooser;

class Diary extends JFrame implements ActionListener,TreeSelectionListener{

JMenuBar menubar;

JMenu menu1,menu2,menu3,menu4,menu5,menu6;

JMenuItem item1,item2,item3,item4,item5,item6,item7,item8,item52,item61,item62,item63,item64;

JTextArea text=new JTextArea(20,40);

JButton b_save=new JButton("保存日志");

JButton b_del=new JButton("删除日志");

JButton b3=new JButton("锁定日志");

JButton b4=new JButton("解除锁定");

JSplitPane split1,split2;

JScrollPane scroll1,scroll2;

JPanel p;

JTree tree=null;

int i=0;

DefaultMutableTreeNode root;

DefaultMutableTreeNode month[]=new DefaultMutableTreeNode[13];

Diary(){

final JFrame frame = this;

menubar=new JMenuBar();

menu4=new JMenu("登陆");

item6=new JMenuItem("密码登陆");

menu4.add(item6);

menubar.add(menu4);

menu1=new JMenu("文件");

item1=new JMenuItem("新建");

item2=new JMenuItem("退出");

menu1.add(item1);

menu1.add(item2);

menubar.add(menu1);

menu2=new JMenu("编辑");

item3=new JMenuItem("复制");

item4=new JMenuItem("剪切");

item5=new JMenuItem("粘贴");

item52=new JMenuItem("全选");

menu2.add(item3);

menu2.add(item4);

menu2.add(item5);

menu2.add(item52);

menubar.add(menu2);

menu3=new JMenu("设置");

//item6=new JMenuItem("密码设置");

item63=new JMenuItem("设置字体颜色");

item64=new JMenuItem("设置背景颜色");

item61=new JMenuItem("锁定编辑区");

item62=new JMenuItem("解除锁定");

//menu3.add(item6);

menu3.add(item63);

menu3.add(item64);

menu3.add(item61);

menu3.add(item62);

menubar.add(menu3);

menu4=new JMenu("查看");

item7=new JMenuItem("状态栏");

menu4.add(item7);

menubar.add(menu4);

menu5=new JMenu("帮助");

item8=new JMenuItem("我的日记本信息");

menu5.add(item8);

menubar.add(menu5);

setJMenuBar(menubar); //把菜单条添加到窗口顶端

Container con=getContentPane(); //调用getContentPane()方法获的内容面板

root=new DefaultMutableTreeNode("日历记事本"); //结合树的输入与输出建立一个日历记事本

for(i=1;i=12;i++)

{

month[i]=new DefaultMutableTreeNode(""+i+"月");

root.add(month[i]);

}

for(i=1;i=12;i++)

{

if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)

{

for(int j=1;j=31;j++)

month[i].add(new DefaultMutableTreeNode(j+"日"));

}

else if(i==4||i==6||i==9||i==11)

{

for(int j=1;j=30;j++)

month[i].add(new DefaultMutableTreeNode(j+"日"));

}

else

{

for(int j=1;j=28;j++)

month[i].add(new DefaultMutableTreeNode(j+"日"));

}

}

tree=new JTree(root);

p=new JPanel(); //使用JPanel创建一个面板

p.add(b_save);p.add(b_del);p.add(b3);p.add(b4); //把这4个按钮组件假如面板中

scroll1=new JScrollPane(text,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); //把文本框放入滚动窗格中

b_save.addActionListener((ActionListener) this); //按钮的监听器

b_del.addActionListener((ActionListener) this);

scroll2=new JScrollPane(tree);

split1=new JSplitPane(JSplitPane.VERTICAL_SPLIT,true,p,scroll1); //水平拆分这4个按钮和文本区

split2=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scroll2,split1); //竖直拆分树行日历和文本按钮区

item1.addActionListener((ActionListener) this); //菜单栏的监听器

item2.addActionListener((ActionListener) this);

item3.addActionListener((ActionListener) this);

item4.addActionListener((ActionListener) this);

item5.addActionListener((ActionListener) this);

item6.addActionListener((ActionListener) this);

item7.addActionListener((ActionListener) this);

item8.addActionListener((ActionListener) this);

item52.addActionListener((ActionListener) this);

item61.addActionListener((ActionListener) this);

item62.addActionListener((ActionListener) this);

item63.addActionListener((ActionListener) this);

tree.addTreeSelectionListener((TreeSelectionListener) this); //树形日历的监听器

con.setLayout(new FlowLayout()); //设置布局

setSize(600,500); //设置窗体的大小

Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();

setLocation((screen.width-300)/2,(screen.height-220)/2);

setResizable(false); //设置窗口不可以调节大小

setVisible(true); //设置窗口为可视

con.add(split2); //把树形日历和按钮，文本区都加入到内容面板中

setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); //单击关闭图标后关闭窗口

}

public void valueChanged(TreeSelectionEvent e) //处理树形事件的接口

{

text.setText(null);

if(e.getSource()==tree)

{

DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();

if(node.isLeaf())

{

String str=node.toString();

for( i=0;i=12;i++)

{

if(node.getParent()==month[i])

{

try{String temp=null;

File f=new File(node.getParent().toString()+str+".text");

FileReader file=new FileReader(f);

BufferedReader in=new BufferedReader(file);

while((temp=in.readLine())!=null)

text.append(temp+'\n');

file.close();

in.close();

}

catch(Exception el){}

}

}

}

}

}

//}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==b_save) //保存按钮的实现方法

{

DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();

String str=node.toString();

if(node.isLeaf())

{

try{

File f=new File(node.getParent().toString()+str+".text");

FileWriter tofile=new FileWriter(f);

BufferedWriter out=new BufferedWriter(tofile);

out.write(text.getText(),0,(text.getText()).length());

out.flush();

tofile.close(); out.close();

}

catch(Exception el){}

}

}

else if(e.getSource()==b_del)

{

int n=JOptionPane.showConfirmDialog(this, "该文件还没有保存，确定要删除吗？","确认对话框", JOptionPane.YES_NO_OPTION);

if(n==JOptionPane.YES_OPTION)

{

DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();

String str=node.toString();

if(node.isLeaf())

{

File f=new File(node.getParent().toString()+str+".text");

f.delete();

}

}

else if(n==JOptionPane.NO_OPTION)

{

System.exit(0);

}

}

else if(e.getSource()==b3)

{

text.setEditable(false);

}

else if(e.getSource()==b4)

{

text.setEditable(true);

}

String selected=e.getActionCommand(); //获取命令

if(selected.equals("退出")){ //执行"退出"命令

dispose();

}

else if(selected.equals("新建")){

text.setText("");

}

else if(selected.equals("复制"))

{

text.copy();

}

else if(selected.equals("剪切"))

{

text.cut();

}

else if(selected. equals("粘贴"))

{

text.paste();

}

else if(selected.equals("全选"))

{

text.selectAll();

}

else if(selected.equals("密码登陆"))

{

LoginWindow login=new LoginWindow();

}

else if(selected.equals("设置字体颜色")){

Color newColor=JColorChooser.showDialog(this, "选择字体颜色", text.getForeground());

if(newColor !=null)

{

text.setForeground(newColor);

}

}

else if(selected.equals("设置背景颜色"))

{

Color newColor=JColorChooser.showDialog(this, "选择背景颜色", text.getBackground());

if(newColor !=null)

{

text.setBackground(newColor);

}

}

else if(selected.equals("锁定编辑区"))

{

text.setEditable(false);

}

else if(selected.equals("解除锁定"))

{

text.setEditable(true);

}

}

}

class LoginWindow extends JFrame implements ActionListener {

JPanel p1=new JPanel(); //定义并建立面板

JPanel p2=new JPanel();

JPanel p3=new JPanel();

JPanel p4=new JPanel();

JPanel p5=new JPanel();

JTextField text1=new JTextField(15); //用户名文本框

JPasswordField text2=new JPasswordField(15); //密码域

JButton ok=new JButton("确定");

JButton cancel=new JButton("取消");

LoginWindow()

{

setBackground(Color.DARK_GRAY); //设置背景颜色

Container con=getContentPane(); //取出内容面板

con.setLayout(new GridLayout(5,1)); //设置布局为5行1列

p2.add(new JLabel("用户名："));p2.add(text1); //将组件添加到中间容器

p3.add(new JLabel("密码"));p3.add(text2);

p4.add(ok);p4.add(cancel);

ok.addActionListener(this); //注册事件监听器

cancel.addActionListener(this);

text1.addActionListener(this);

text2.addActionListener(this);

con.add(p1); con.add(p2); con.add(p3); con.add(p4); con.add(p5); //将面板添加到内容面板

setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); //单击关闭图标后关闭窗口

setSize(300,220); //设置窗口的大小

Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();

setLocation((screen.width-300)/2,(screen.height-220)/2);

setTitle("登录窗口");

setResizable(false); // 不让用户改变窗口大小

setVisible(true);

}

public void actionPerformed(ActionEvent e) {

if(e.getSource()==ok||e.getSource()==text2){

if(text1.getText().trim().equals("meijianwen") text2.getText().trim().equals("070341320")){

dispose(); //关闭登陆窗口

}

else{

JOptionPane.showMessageDialog(null, "用户名或密码错误！");

text1.requestFocus(); //设置焦点

text1.setSelectionStart(0); //设置选中文本开始位置

text1.setSelectionEnd(text1.getText().length());

}

}

else if(e.getSource()==cancel){ //单击取消按钮

dispose();

//System.exit(0);

}

else if(e.getSource()==text1) //在用户名文本框按回车焦点移到密码域

text2.requestFocus();

}

}

public class MyDiary

{

public static void main(String args[])

{

JFrame.setDefaultLookAndFeelDecorated(true);

Font font=new Font("JFrame",Font.PLAIN,14); //定义字体

Enumeration keys=UIManager.getLookAndFeelDefaults().keys(); //枚举风格关键字

while(keys.hasMoreElements())

{

Object key=keys.nextElement();

// if(((String)key).equals("Menu.foreground")||((String)key).equals("MenuItem.foreground"))

// UIManager.put(key,Color.DARK_GRAY); //设置菜单文字颜色

if(UIManager.get(key)instanceof Font)UIManager.put(key,font);

}

Diary win=new Diary();

win.validate();

}

}

用java写的日历记事本代码？

详细代码

//CalendarWindow类：

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import java.io.*;

public class CalendarWindow extends JFrame implements ActionListener,

MouseListener,FocusListener{

int year,month,day;

CalendarMessage calendarMessage;

CalendarPad calendarPad;

NotePad notePad;

JTextField showYear,showMonth;

JTextField [] showDay;

CalendarImage calendarImage;

Clock clock;

JButton nextYear,previousYear,nextMonth,previousMonth;

JButton saveDailyRecord,deleteDailyRecord,readDailyRecord;

File dir;

Color backColor=Color.gray;

public CalendarWindow(){

dir=new File("./dailyRecord");

dir.mkdir();

showDay=new JTextField[42];

for(int i=0;ishowDay.length;i++){

showDay[i]=new JTextField();

showDay[i].setBackground(backColor);

showDay[i].setLayout(new GridLayout(3,3));

showDay[i].addMouseListener(this);

showDay[i].addFocusListener(this);

}

calendarMessage=new CalendarMessage();

calendarPad=new CalendarPad();

notePad=new NotePad();

Calendar calendar=Calendar.getInstance();

calendar.setTime(new Date());

year=calendar.get(Calendar.YEAR);

month=calendar.get(Calendar.MONTH)+1;

day=calendar.get(Calendar.DAY_OF_MONTH);

calendarMessage.setYear(year);

calendarMessage.setMonth(month);

calendarMessage.setDay(day);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.setShowDayTextField(showDay);

notePad.setShowMessage(year,month,day);

calendarPad.showMonthCalendar();

doMark(); //给有日志的号码做标记,见后面的doMark()方法

calendarImage=new CalendarImage();

calendarImage.setImageFile(new File("sea.jpg"));

clock=new Clock();

JSplitPane splitV1=

new JSplitPane(JSplitPane.VERTICAL_SPLIT,calendarPad,calendarImage);

JSplitPane splitV2=

new JSplitPane(JSplitPane.VERTICAL_SPLIT,notePad,clock);

JSplitPane splitH=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,splitV1,splitV2);

add(splitH,BorderLayout.CENTER);

showYear=new JTextField(""+year,6);

showYear.setFont(new Font("TimesRoman",Font.BOLD,12));

showYear.setHorizontalAlignment(JTextField.CENTER);

showMonth=new JTextField(" "+month,4);

showMonth.setFont(new Font("TimesRoman",Font.BOLD,12));

showMonth.setHorizontalAlignment(JTextField.CENTER);

nextYear=new JButton("下年");

previousYear=new JButton("上年");

nextMonth=new JButton("下月");

previousMonth=new JButton("上月");

nextYear.addActionListener(this);

previousYear.addActionListener(this);

nextMonth.addActionListener(this);

previousMonth.addActionListener(this);

showYear.addActionListener(this);

JPanel north=new JPanel();

north.add(previousYear);

north.add(showYear);

north.add(nextYear);

north.add(previousMonth);

north.add(showMonth);

north.add(nextMonth);

add(north,BorderLayout.NORTH);

saveDailyRecord=new JButton("保存日志") ;

deleteDailyRecord=new JButton("删除日志");

readDailyRecord=new JButton("读取日志");

saveDailyRecord.addActionListener(this);

deleteDailyRecord.addActionListener(this);

readDailyRecord.addActionListener(this);

JPanel pSouth=new JPanel();

pSouth.add(saveDailyRecord);

pSouth.add(deleteDailyRecord);

pSouth.add(readDailyRecord);

add(pSouth,BorderLayout.SOUTH);

setVisible(true);//根据参数 b 的值显示或隐藏此 Window

setBounds(60,60,660,480);

validate();//验证此容器及其所有子组件

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //设置用户在此窗体上发起 "close" 时默认执行的操作

}

public void actionPerformed(ActionEvent e){

if(e.getSource()==nextYear){

year++;

showYear.setText(""+year);

calendarMessage.setYear(year);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.showMonthCalendar();

notePad.setShowMessage(year,month,day);

doMark();

}

else if(e.getSource()==previousYear){

year--;

showYear.setText(""+year);

calendarMessage.setYear(year);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.showMonthCalendar();

notePad.setShowMessage(year,month,day);

doMark();

}

else if(e.getSource()==nextMonth){

month++;

if(month12) month=1;

showMonth.setText(" "+month);

calendarMessage.setMonth(month);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.showMonthCalendar();

notePad.setShowMessage(year,month,day);

doMark();

}

else if(e.getSource()==previousMonth){

month--;

if(month1) month=12;

showMonth.setText(" "+month);

calendarMessage.setMonth(month);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.showMonthCalendar();

notePad.setShowMessage(year,month,day);

doMark();

}

else if(e.getSource()==showYear){

String s=showYear.getText().trim();

char a[]=s.toCharArray();

boolean boo=false;

for(int i=0;ia.length;i++)

if(!(Character.isDigit(a[i])))

boo=true;

if(boo==true) //弹出“警告”消息对话框

JOptionPane.showMessageDialog(this,"您输入了非法年份","警告", JOptionPane.WARNING_MESSAGE);

else if(boo==false)

year=Integer.parseInt(s);

showYear.setText(""+year);

calendarMessage.setYear(year);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.showMonthCalendar();

notePad.setShowMessage(year,month,day);

doMark();

}

else if(e.getSource()==saveDailyRecord){

notePad.save(dir,year,month,day);

doMark();

}

else if(e.getSource()==deleteDailyRecord){

notePad.delete(dir,year,month,day);

doMark();

}

else if(e.getSource()==readDailyRecord)

notePad.read(dir,year,month,day);

}

public void mousePressed(MouseEvent e){

JTextField text=(JTextField)e.getSource();

String str=text.getText().trim();

try{ day=Integer.parseInt(str);

}

catch(NumberFormatException exp){

}

calendarMessage.setDay(day);

notePad.setShowMessage(year,month,day);

}

public void mouseReleased(MouseEvent e){}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mouseClicked(MouseEvent e) {}

public void focusGained(FocusEvent e){

Component com=(Component)e.getSource();

com.setBackground(Color.red);

}

public void focusLost(FocusEvent e){

Component com=(Component)e.getSource();

com.setBackground(backColor);

}

public void doMark(){

for(int i=0;ishowDay.length;i++){

showDay[i].removeAll();

String str=showDay[i].getText().trim();

try{

int n=Integer.parseInt(str);

if(isHaveDailyRecord(n)==true){ //见后面的isHaveDailyRecord()方法

JLabel mess=new JLabel("存");

mess.setFont(new Font("TimesRoman",Font.PLAIN,11));

mess.setForeground(Color.black) ;

showDay[i].add(mess);

} }

catch(Exception exp){}

}

calendarPad.repaint();

calendarPad.validate();

}

public boolean isHaveDailyRecord(int n){

String key=""+year+""+month+""+n;

String [] dayFile=dir.list();

boolean boo=false;

for(int k=0;kdayFile.length;k++){

if(dayFile[k].equals(key+".txt")){

boo=true;

break;

} }

return boo;

}

public static void main(String args[]){

new CalendarWindow();

}

}

//CalendarPad类：

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

public class CalendarPad extends JPanel{

int year,month,day;

CalendarMessage calendarMessage;

JTextField [] showDay;

JLabel title[];

String [] 星期={"SUN/日","MON/一","TUE/二","WED/三","THU/四","FRI/五","SAT/六"};

JPanel north,center;

public CalendarPad(){

setLayout(new BorderLayout());

north=new JPanel();

north.setLayout(new GridLayout(1,7));

center=new JPanel();

center.setLayout(new GridLayout(6,7));

add(center,BorderLayout.CENTER);

add(north,BorderLayout.NORTH);

title=new JLabel[7];

for(int j=0;j7;j++){

title[j]=new JLabel();

title[j].setFont(new Font("TimesRoman",Font.BOLD,12));

title[j].setText(星期[j]);

title[j].setHorizontalAlignment(JLabel.CENTER);

title[j].setBorder(BorderFactory.createRaisedBevelBorder());

north.add(title[j]);

}

title[0].setForeground(Color.red);

title[6].setForeground(Color.blue);

}

public void setShowDayTextField(JTextField [] text){

showDay=text;

for(int i=0;ishowDay.length;i++){

showDay[i].setFont(new Font("TimesRoman",Font.BOLD,15));

showDay[i].setHorizontalAlignment(JTextField.CENTER);

showDay[i].setEditable(false);

center.add(showDay[i]);

}

}

public void setCalendarMessage(CalendarMessage calendarMessage){

this.calendarMessage=calendarMessage;

}

public void showMonthCalendar(){

String [] a=calendarMessage.getMonthCalendar();

for(int i=0;i42;i++)

showDay[i].setText(a[i]);

validate();

}

}

java编写一个记事本小程序，接着下面的代码写，求大神解救！实现新建，保存，打开功能就行！

package tuxingjiemian;

import javax.swing.*;

import javax.swing.event.*;

import java.awt.*;

import java.awt.event.*;

import java.io.File;

import java.io.PrintStream;

public class jishiben extends JFrame {

JPanel jp=new JPanel();

JFrame find_replace=new JFrame();

JMenu file=new JMenu("文件");

JMenu edit=new JMenu("编辑");

JMenu help=new JMenu("帮助");

JMenuBar menubar=new JMenuBar();

JTextArea aa=new JTextArea();

class Open implements ActionListener {

public void actionPerformed(ActionEvent e) {

JFileChooser jf= new JFileChooser();

jf.showOpenDialog(jishiben.this);

try {

PrintStream p=new PrintStream(jf.getSelectedFile().getPath());

} catch (Exception e2) {

}

}

}

class Save implements ActionListener {

public void actionPerformed(ActionEvent e) {

JFileChooser jf= new JFileChooser();

jf.showSaveDialog(jishiben.this);

try {

PrintStream p=new PrintStream(jf.getSelectedFile().getPath());

} catch (Exception e2) {

}

}

}

public jishiben(){

this.setTitle("记事本");

this.setSize(500, 500);

this.setLayout(new BorderLayout());

JMenuItem open=new JMenuItem("打开");

open.addActionListener(new Open());

JMenuItem save=new JMenuItem("保存");

save.addActionListener(new Save());

JMenuItem exit=new JMenuItem("退出");

exit.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

System.exit(0);

}

});

file.add(open);

file.add(save);

file.addSeparator();

file.add(exit);

menubar.add(file);

this.add(new JScrollPane(aa),BorderLayout.CENTER);

JMenuItem copy=new JMenuItem("复制");

JMenuItem past=new JMenuItem("粘贴");

JMenuItem delete=new JMenuItem("删除");

JMenuItem find=new JMenuItem("查找");

JMenuItem replace=new JMenuItem("替换");

copy.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

jishiben.this.aa.copy();

}

});

past.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

jishiben.this.aa.paste();

}

});

delete.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

jishiben.this.aa.replaceSelection(null);

}

});

edit.add(copy);

edit.add(past);

edit.add(delete);

edit.add(find);

edit.add(replace);

menubar.add(edit);

help.add(new JMenuItem("帮助"));

menubar.add(help);

this.add(menubar,BorderLayout.NORTH);

this.setVisible(true);

this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);

}

public static void main(String[] args) {

new jishiben();

}

};

用java编写 我的日记 的程序,并实现其功能,重点是要用java与数据库连接

你可以写4个界面，1登录，2主界面(里边显示所有日记题目)，3写日记(insert就行)，4查看日记(点击事件select查询)，我最近忙考试，只能给你数据库连接类，其他你照书上在点击事件中调用对应的数据库方法就ok了。

package csm.db.conn;

import java.sql.*;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

public class DBconn {

static String DBDriver="com.microsoft.sqlserver.jdbc.SQLServerDriver";

static String ConnStr="jdbc:sqlserver://localhost:1433;DatabaseName=cms;username=sa;password=saas";

private Statement stmt;

private Connection conn;

static{

try {

Class.forName(DBDriver);

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

}

/**

*

* 获得Statment对象

*/

public void getStatement()throws Exception{

try

{

conn = DriverManager.getConnection(ConnStr);

stmt=conn.createStatement();

}

catch (SQLException e)

{

e.printStackTrace();

}

}

/**

*

* 关闭所有连接对象

*/

public void closeAll() throws SQLException {

try {

stmt.close();

conn.close();

}

catch(SQLException se) {

throw se;

}

}

/**

*

* @param sql查询语句

* @return ResultSet对象

*/

public ResultSet getResultSet(String sql) throws Exception{

getStatement();

ResultSet rs = stmt.executeQuery(sql);

return rs;

}

/**

*

* @param sql插入更新语句

* @return 受影响行数

*/

public int executeSql(String sql)throws Exception{

int records=0;

getStatement();

records=stmt.executeUpdate(sql);

return records;

}

}

我想用java编写windows记事本的新建功能怎么写？要有代码演示。

这是一个我以前写的简单的记事本，里面有新建，保存，另存，打开等功能，但是只是逻辑最简单的那种，你看看吧，希望对你有帮助；

import java.awt.FileDialog;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.File;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

public class NotePad {

public static void main(String[] args) {

NotePadFrame notPadFrame = new NotePadFrame();

notPadFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

notPadFrame.setVisible(true);

}

}

class NotePadFrame extends JFrame {

private JMenu jmb, jmb1;

private JMenuBar Jmenu = new JMenuBar();

private JMenuItem fm, fm1, fm2, fm3, fm4, fe1, fe2, fe3, fe4;

String fileName, copy, paste, cut;

NotePadPanel notePadPanel = new NotePadPanel(this);

private NotePadFrame f;

public NotePadFrame() {

jmb = new JMenu("文件");

this.setJMenuBar(Jmenu);

fm = new JMenuItem("新建");

jmb.add(fm);

jmb.addSeparator();

// 新建

fm.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

try {

if (e.getSource() == fm) {

if (!(notePadPanel.getTa().getText()).equals("")) {

Object[] options = { "确定", "取消" };

int response = JOptionPane.showOptionDialog(null,

"你是否保存", "提示", JOptionPane.YES_OPTION,

JOptionPane.QUESTION_MESSAGE, null,

options, options[0]);

if (response == 0) {

FileDialog d = new FileDialog(f, "保存文件",

FileDialog.SAVE);

d.setVisible(true);

fileName = d.getDirectory() + d.getFile();

FileOutputStream fout = new FileOutputStream(

fileName + ".txt");

byte[] bb = notePadPanel.getTa().getText()

.getBytes();

fout.write(bb);

// 关闭

fout.close();

JOptionPane.showMessageDialog(null, "已保存");

notePadPanel.getTa().setText("");

}

if (response == 1) {

JOptionPane.showMessageDialog(null, "你选择了取消");

notePadPanel.getTa().setText("");

}

}

}

} catch (Exception e2) {

System.out.println(e2.getMessage());

}

}

});

fm1 = new JMenuItem("打开");

jmb.add(fm1);

jmb.addSeparator();

// 打开文件

fm1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

try {

if (e.getSource() == fm1) {

FileDialog d = new FileDialog(f, "打开文件",

FileDialog.LOAD);

d.setVisible(true);

File file = new File(d.getDirectory() + d.getFile());

for (int i = 0; i = file.length(); i++) {

char[] ch = new char[1024];

FileReader fr = new FileReader(file);

fr.read(ch);

String str = new String(ch);

notePadPanel.getTa().setText(str);

}

}

} catch (IOException e3) {

System.out.println(e3.getMessage());

}

}

});

fm2 = new JMenuItem("保存");

jmb.add(fm2);

jmb.addSeparator();

// 保存文件

fm2.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

try {

if (e.getSource() == fm2) {

if (fileName == null) {

fileName = JOptionPane.showInputDialog("请输入文件名",

"java");

FileOutputStream fout = new FileOutputStream(

fileName + ".txt");

byte[] bb = notePadPanel.getTa().getText()

.getBytes();

fout.write(bb);

// 关闭

fout.close();

JOptionPane.showMessageDialog(null, "已保存");

} else {

FileOutputStream fout = new FileOutputStream(

fileName + ".txt");

byte[] bb = notePadPanel.getTa().getText()

.getBytes();

fout.write(bb);

// 关闭

fout.close();

JOptionPane.showMessageDialog(null, "已保存");

}

}

} catch (IOException e1) {

System.out.println(e1.getMessage());

}

}

});

fm3 = new JMenuItem("另存为");

jmb.add(fm3);

jmb.addSeparator();

// 另存为

fm3.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

if (e.getSource() == fm3) {

try {

FileDialog d = new FileDialog(f, "另存为", FileDialog.SAVE);

d.setVisible(true);

fileName = d.getDirectory() + d.getFile();

FileOutputStream fout = new FileOutputStream(fileName + ".txt");

byte[] bb = notePadPanel.getTa().getText().getBytes();

fout.write(bb);

// 关闭

fout.close();

} catch (Exception e4) {

System.out.println(e4.getMessage());

}

}

}

});

fm4 = new JMenuItem("关闭");

jmb.add(fm4);

fm4.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

if (e.getSource() == fm4) {

System.exit(0);

}

}

});

jmb1 = new JMenu("编辑");

fe1 = new JMenuItem("复制");

jmb1.add(fe1);

jmb1.addSeparator();

fe1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

if (e.getSource() == fe1) {

copy = notePadPanel.getTa().getSelectedText();

}

}

});

fe2 = new JMenuItem("粘贴");

jmb1.add(fe2);

jmb1.addSeparator();

fe2.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

if (e.getSource() == fe2) {

System.out.println("copy="+copy);

notePadPanel.getTa().setText(copy);

}

}

});

fe3 = new JMenuItem("剪切");

jmb1.add(fe3);

jmb1.addSeparator();

fe3.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

if (e.getSource() == fe3) {

copy = notePadPanel.getTa().getSelectedText();

notePadPanel.getTa().setText("");

}

}

});

fe4 = new JMenuItem("版本");

jmb1.add(fe4);

fe4.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

if(e.getSource()==fe4){

JOptionPane.showMessageDialog(f, "NotePad 1.0");

}

}

});

Jmenu.add(jmb);

Jmenu.add(jmb1);

}

}

class NotePadPanel extends JPanel {

private JButton jb1, jb;

private JTextArea ta;

String fileName;

private JScrollPane jsp;

public JTextArea getTa() {

return ta;

}

public void setTa(JTextArea ta) {

this.ta = ta;

}

public NotePadPanel(NotePadFrame notePadFrame) {

ta = new JTextArea();

ta.setWrapStyleWord(true);

jsp = new JScrollPane(ta);

jb = new JButton("保存");

jb.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

try {

if (e.getSource() == jb) {

if (fileName == null) {

fileName = JOptionPane.showInputDialog("请输入文件名",

"java");

FileOutputStream fout = new FileOutputStream(

fileName + ".txt");

byte[] bb = ta.getText().getBytes();

fout.write(bb);

// 关闭

fout.close();

JOptionPane.showMessageDialog(null, "已保存");

} else {

FileOutputStream fout = new FileOutputStream(

fileName + ".txt");

byte[] bb = ta.getText().getBytes();

fout.write(bb);

// 关闭

fout.close();

JOptionPane.showMessageDialog(null, "已保存");

}

}

} catch (IOException e1) {

System.out.println(e1.getMessage());

}

}

});

jb1 = new JButton("关闭");

jb1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

if (e.getSource() == jb1) {

System.exit(0);

}

}

});

this.add(jb);

this.add(jb1);

notePadFrame.add(this, "South");

notePadFrame.setSize(600, 400);

notePadFrame.add(jsp);

notePadFrame.setTitle("记事本");

int W = (int) Toolkit.getDefaultToolkit().getScreenSize().getWidth();

int H = (int) Toolkit.getDefaultToolkit().getScreenSize().getHeight();

notePadFrame.setLocation((W - notePadFrame.getWidth()) / 2,

(H - notePadFrame.getHeight()) / 2);

}

}