java编程文本

① 用java编写一个GUI记事本程序，实现文本的输入，保存，修改，打开操作

代码如下：

importjava.io.*;
importjava.awt.*;
importjava.awt.event.*;

publicclassjtxtfm{
publicstaticvoidmain(Stringargs[]){
jtxtfrmfm=newjtxtfrm();
}
}
{
FileDialogop,sv;
Buttonbtn1,btn2,btn3;
TextAreatarea;
jtxtfrm(){
super("读写文件");
setLayout(null);
setBackground(Color.cyan);
setSize(600,300);
setVisible(true);
btn1=newButton("打开");
btn2=newButton("保存");
btn3=newButton("关闭");
tarea=newTextArea("");
add(btn1);add(btn2);add(btn3);add(tarea);
tarea.setBounds(30,50,460,220);
btn1.setBounds(520,60,50,30);
btn2.setBounds(520,120,50,30);
btn3.setBounds(520,180,50,30);
op=newFileDialog(this,"打开",FileDialog.LOAD);
sv=newFileDialog(this,"保存",FileDialog.SAVE);
btn1.addActionListener(this);
btn2.addActionListener(this);
btn3.addActionListener(this);
addWindowListener(
newWindowAdapter(){
publicvoidwindowClosing(WindowEvente){
setVisible(false);
System.exit(0);
}
}
);
}

publicvoidactionPerformed(ActionEvente){
if(e.getSource()==btn1){
Stringstr;
op.setVisible(true);
try{
Filef1=newFile(op.getDirectory(),op.getFile());
FileReaderfr=newFileReader(f1);
BufferedReaderbr=newBufferedReader(fr);
tarea.setText("");
while((str=br.readLine())!=null)tarea.append(str+'
');
fr.close();
}
catch(Exceptione1)
{}
}

if(e.getSource()==btn2){
sv.setVisible(true);
try{
Filef1=newFile(sv.getDirectory(),sv.getFile());
FileWriterfw=newFileWriter(f1);
BufferedWriterbw=newBufferedWriter(fw);
Stringgt=tarea.getText();
bw.write(gt,0,gt.length());
bw.flush();
fw.close();
}
catch(Exceptione2)
{}
}

if(e.getSource()==btn3){
System.exit(0);
}

}
}

效果图：

② 求一个用Java编写的文本编辑器代码

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class MyTextEditor extends JFrame implements ActionListener,ItemListener,MouseListener
{
private File file;
private JTextArea textarea;
private JRadioButtonMenuItem rbmi_red,rbmi_blue,rbmi_green;
private JMenuItem menuitem_,menuitem_cut,menuitem_paste,menuitem_seek;
private JMenuItem menuitem_song,menuitem_fang,menuitem_kai;//字体变量
private JMenuItem menuitem_normal,menuitem_bold,menuitem_italic;//字形变量
private JMenuItem menuitem_20,menuitem_30,menuitem_40;//字号变量
private JMenuItem menuitem_exit,menuitem_infor;
private JPopupMenu popupmenu;
private JMenuItem menuitem_red,menuitem_green,menuitem_blue;
private JDialog dialog,dialog1;
private JButton button_seek;
private JTextField textfield_seek;
private JLabel label_seek,label_infor;
String seek;

public MyTextEditor()
{
super("文本编辑器");
this.setSize(400,300);
this.setLocation(360,300);
this.setDefaultCloseOperation(HIDE_ON_CLOSE);

Container ss=this.getContentPane();
this.textarea = new JTextArea();
JScrollPane dd=new JScrollPane(textarea);
ss.add(dd);
textarea.addMouseListener(this);
this.addMenu();
this.setVisible(true);
this.Dialog();
this.Dialog1();

this.file = null;
}

public MyTextEditor(String filename)
{
this();
if (filename!=null)
{
this.file = new File(filename);
this.setTitle(filename);
this.textarea.setText(this.readFromFile());
}
}

public MyTextEditor(File file)
{
this();
if (file!=null)
{
this.file = file;
this.setTitle(this.file.getName());
this.textarea.setText(this.readFromFile());
}
}

public void Dialog() //建立对话框的方法
{
dialog=new JDialog(this,"查找",true);
dialog.setLayout(new FlowLayout());
dialog.setSize(200,90);

label_seek=new JLabel("查找内容");
dialog.add(label_seek);

textfield_seek=new JTextField(10);
dialog.add(textfield_seek);

button_seek=new JButton("查找");
dialog.add(button_seek);
button_seek.addActionListener(this);

}
public void Dialog1()
{

dialog1=new JDialog(this,"专利",true);
dialog1.setLayout(new FlowLayout());
dialog1.setSize(200,100);

label_infor=new JLabel("刘同虎制作");
dialog1.add(label_infor);
}

public void addMenu()
{
JMenuBar menubar = new JMenuBar();
this.setJMenuBar(menubar);

JMenu menu_file = new JMenu("文件"); //文件菜单
menubar.add(menu_file);
JMenuItem menuitem_open = new JMenuItem("打开");
menu_file.add(menuitem_open);
menuitem_open.addActionListener(this);

JMenuItem menuitem_save = new JMenuItem("保存");
menu_file.add(menuitem_save);
menuitem_save.addActionListener(this);

JMenuItem menuitem_saveas = new JMenuItem("另存为");
menu_file.add(menuitem_saveas);
menuitem_saveas.addActionListener(this);

menuitem_exit=new JMenuItem("退出" );
menu_file.add(menuitem_exit);
menuitem_exit.addActionListener(this);

menuitem_infor=new JMenuItem("信息");
menu_file.add(menuitem_infor);
menuitem_infor.addActionListener(this);

JMenu menu_editor=new JMenu("编辑");//编辑菜单
menubar.add(menu_editor);

menuitem_seek=new JMenuItem("查找");
menu_editor.add(menuitem_seek);
menuitem_seek.addActionListener(this);

menuitem_=new JMenuItem("复制");
menuitem_.addActionListener(this);
menu_editor.add(menuitem_);

menuitem_cut=new JMenuItem("剪切");
menu_editor.add(menuitem_cut);
menuitem_cut.addActionListener(this);

menuitem_paste=new JMenuItem("粘贴");
menu_editor.add(menuitem_paste);
menuitem_paste.addActionListener(this);

JMenuItem menu_color=new JMenu("颜色");//颜色菜单
menu_editor.add(menu_color);

ButtonGroup buttongroup=new ButtonGroup();
rbmi_red=new JRadioButtonMenuItem("红",true);
buttongroup.add(rbmi_red);
menu_color.add(rbmi_red);
rbmi_red.addItemListener(this);

rbmi_blue=new JRadioButtonMenuItem("蓝",true);
buttongroup.add(rbmi_blue);
menu_color.add(rbmi_blue);
rbmi_blue.addItemListener(this);

rbmi_green=new JRadioButtonMenuItem("绿",true);
buttongroup.add(rbmi_green);
menu_color.add(rbmi_green);
rbmi_green.addItemListener(this);

JMenu menu_font=new JMenu("设置字体");//设置字体菜单
menubar.add(menu_font);

menuitem_song=new JMenuItem("宋体");
menu_font.add(menuitem_song);
menuitem_song.addActionListener(this);

menuitem_fang=new JMenuItem("仿宋");
menu_font.add(menuitem_fang);
menuitem_fang.addActionListener(this);

menuitem_kai=new JMenuItem("楷体");
menu_font.add(menuitem_kai);
menuitem_kai.addActionListener(this);

JMenu menu_style=new JMenu("设置字形");//设置字形菜单
menubar.add(menu_style);

menuitem_bold=new JMenuItem("粗体");
menu_style.add(menuitem_bold);
menuitem_bold.addActionListener(this);

menuitem_italic=new JMenuItem("斜体");
menu_style.add(menuitem_italic);
menuitem_italic.addActionListener(this);

JMenu menu_size=new JMenu("设置字号"); //设置字号菜单
menubar.add(menu_size);

menuitem_20=new JMenuItem("20");
menu_size.add(menuitem_20);
menuitem_20.addActionListener(this);

menuitem_30=new JMenuItem("30");
menu_size.add(menuitem_30);
menuitem_30.addActionListener(this);

menuitem_40=new JMenuItem("40");
menu_size.add(menuitem_40);
menuitem_40.addActionListener(this);

popupmenu=new JPopupMenu(); //快捷菜单
JMenuItem menuitem_red=new JMenuItem("红色");
popupmenu.add(menuitem_red);
menuitem_red.addActionListener(this);

JMenuItem menuitem_green=new JMenuItem("绿色");
popupmenu.add(menuitem_green);
menuitem_green.addActionListener(this);

menuitem_blue=new JMenuItem("蓝色");
popupmenu.add(menuitem_blue);
menuitem_blue.addActionListener(this);

textarea.add(popupmenu); //向文本区内添加快捷菜单

}

public void writeToFile(String lines) //写文件
{
try
{
FileWriter fout = new FileWriter(this.file);
fout.write(lines+"\r\n");
fout.close();
}
catch (IOException ioex)
{
return;
}
}

public String readFromFile() //读文件
{
try
{
FileReader fin = new FileReader(this.file);
BufferedReader bin = new BufferedReader(fin);
String aline="", lines="";
do
{
aline = bin.readLine();
if (aline!=null)
lines += aline + "\r\n";
} while (aline!=null);

bin.close();
fin.close();
return lines;
}
catch (IOException ioex)
{
return null;
}
}

③ 用java编一个文本汉字替换程序

package com.;

import java.io.*;

public class ReplaceChinese {
public static void main(String[] args) {
String filePath = "F:\\workspace\\onlineChat\\src\\com\\\\ReplaceChinese.java";
File file = new File(filePath);
if (!file.exists()) {
System.out.println("文件不存在!");
return;
}
BufferedReader reader = null;
String result = "";// 用于存修改后的文字
String lineString = "";
try {
reader = new BufferedReader(new FileReader(file));
String tempString = null;
int line = 1;
// 一次读入一行，直到读入null为文件结束
while ((tempString = reader.readLine()) != null) {
// 显示行号
for (int i = 0; i < tempString.length(); i++) {
if (tempString.substring(i, i + 1).matches(
"[\u4e00-\u9fa5]")) {
lineString += "[您要替换的代码]";
} else {
lineString += tempString.substring(i, i + 1);
}
}
result += lineString + "\n";
lineString = "";
line++;
}
reader.close();
BufferedWriter bw = new BufferedWriter(
new OutputStreamWriter(
new FileOutputStream("F:\\workspace\\onlineChat\\src\\com\\\\ReplaceChinese1.java")));
bw.write(result);
bw.flush();
bw.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e1) {
}
}
}
}
}
由于时间紧迫,只把功能实现了,优化你自己做做,能够成功运行

④ java语言写一个文本编辑器的源代码

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.util.*; //Date needed
import java.io.PrintWriter;
public class NotePad extends JFrame
{
JTextArea jta;
class newl implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
jta.setText("");
}
}

class openl implements ActionListener
{ public void actionPerformed(ActionEvent e)
{
JFileChooser jf=new JFileChooser();
jf.showOpenDialog(NotePad.this);

}

}
//保存文件的监听
class savel implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
JFileChooser jf = new JFileChooser();
jf.showSaveDialog(NotePad.this);

}
}
//打印的监听 ?
class printl implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
// PrintWriter p = new PrintWriter(NotePad.this);
}
}
//退出记事本的监听
class exitl implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);//退出
}
}

//拷贝的监听
class l implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
jta.();
}
}

//粘贴的监听
class pastel implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
jta.paste();
}
}
//剪切的监听
class cutl implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
jta.cut();
}
}
//查找的监听

//添加日期的监听
class datel implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
Date d=new Date();
jta.append(d.toString());
}
}

//构造函数
public NotePad()
{
jta=new JTextArea("",24,40);
JScrollPane jsp=new JScrollPane(jta);
JMenuBar jmb=new JMenuBar();
JMenu mFile=new JMenu("File");
JMenu mEdit=new JMenu("Edit");

JMenuItem mNew=new JMenuItem("New",KeyEvent.VK_N);
mNew.addActionListener(new newl());
mFile.add(mNew);

JMenuItem mOpen=new JMenuItem("Open",KeyEvent.VK_O);
mOpen.addActionListener(new openl());
mFile.add(mOpen);

JMenuItem mSave=new JMenuItem("Save");
mSave.addActionListener(new savel());
mFile.add(mSave);

mFile.addSeparator(); //添加分割线

JMenuItem mPrint = new JMenuItem("Print");
mPrint.addActionListener(new printl());
mFile.add(mPrint);

mFile.addSeparator(); //添加分割线

JMenuItem mExit=new JMenuItem("Exit");
mExit.addActionListener(new exitl());
mFile.add(mExit);
mFile.setMnemonic(KeyEvent.VK_F);

//编辑菜单的子菜单的处理
JMenuItem jmi;
jmi=new JMenuItem("Copy");
jmi.addActionListener(new l());
mEdit.add(jmi);

jmi=new JMenuItem("Cut");
jmi.addActionListener(new cutl());
mEdit.add(jmi);

jmi=new JMenuItem("Paste");
jmi.addActionListener(new pastel());
mEdit.add(jmi);

mEdit.addSeparator(); //添加分割线

jmi=new JMenuItem("Find");

mEdit.add(jmi);

jmi=new JMenuItem("FindNext");
mEdit.add(jmi);
mEdit.addSeparator();
jmi=new JMenuItem("Select All");
mEdit.add(jmi);
jmi=new JMenuItem("Date/Time");
jmi.addActionListener(new datel());
mEdit.add(jmi);

jmb.add(mFile);
jmb.add(mEdit);

this.setJMenuBar(jmb);

this.getContentPane().add(jsp);
this.setSize(200,200);
this.setVisible(true);
}
//主函数，程序入口点
public static void main(String s[])
{
new NotePad();
}

}