java简易记事本
//包含功能：新建，打开，保存，复制，粘贴，查找，替换，版权信息等
package java_test;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FileDialog;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
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;
import javax.swing.JTextField;
/**
* 记事本
* @author D_xiao
*
*/
public class Test extends JFrame {
int start=0;//查找开始位置
int end=0;//查找结束位置
JFrame jf = new JFrame();
File f;
FileDialog open = new FileDialog(jf,"打开",FileDialog.LOAD);
FileDialog save = new FileDialog(jf,"保存",FileDialog.SAVE);
JTextArea jta = new JTextArea();
JPanel pUp = new JPanel();
JScrollPane jp = new JScrollPane(jta);//新建一个滚动条界面，将文本框传入
JMenuBar nm = new JMenuBar();
JMenu m1 = new JMenu("文件");
JMenu m2 = new JMenu("编辑");
JMenu m3 = new JMenu("帮助");
JMenuItem m11 = new JMenuItem("新建");
JMenuItem m12 = new JMenuItem("打开");
JMenuItem m13 = new JMenuItem("另存为");
JMenuItem m14 = new JMenuItem("退出");
JMenuItem m21 = new JMenuItem("复制");
JMenuItem m22 = new JMenuItem("粘贴");
JMenuItem m23 = new JMenuItem("查找");
JMenuItem m24 = new JMenuItem("替换");
JMenuItem m31 = new JMenuItem("关于");
Container c;
Clipboard clipboard = getToolkit().getSystemClipboard();
private void init(){
c=this.getContentPane();
c.setLayout(new BorderLayout());
c.add(jp,BorderLayout.CENTER);
c.add(nm,BorderLayout.NORTH);
nm.add(m1);nm.add(m2);nm.add(m3);
m1.add(m11);m1.add(m12);m1.add(m13);m1.add(m14);
m2.add(m21);m2.add(m22);m2.add(m23);m2.add(m24);
m3.add(m31);
//新建
m11.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
Test xinjian = new Test("新建文本");
}});
//打开
m12.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
open.setVisible(true);
String path = open.getDirectory();
String fileName = open.getFile();
if(path == null||fileName == null)
return;
jta.setText("");
File file = new File(path,fileName);
try{
BufferedReader buf = new BufferedReader(new FileReader(file));
String line = null;
while ((line=buf.readLine()) !=null){
jta.append(line +"\r\n");
setTitle(fileName);
}
buf.close();
}catch(IOException io){
throw new RuntimeException("读取失败");
}
}});
//另存为
m13.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
save.setVisible(true);
String path = save.getDirectory();
String fileName = save.getFile();
if(path == null || fileName == null)
return;
f = new File(path,fileName);
try {
BufferedWriter bufw = new BufferedWriter(new FileWriter(f));
String text = jta.getText();
bufw.write(text);
bufw.close();
} catch (IOException e) {
e.printStackTrace();
}
}});
m14.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
System.exit(0);
}});
//复制
m21.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
//拖动选取文本
String temp = jta.getSelectedText();
//把获取的内容复制到连续字符器，这个类继承了剪贴板接口
StringSelection text = new StringSelection(temp);
//把内容放在剪贴板
clipboard.setContents(text,null);
}});
//粘贴
m22.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
//Transferable接口，把剪贴板的内容转换成数据
Transferable contents = clipboard.getContents(this);
//DataFalvor类判断是否能把剪贴板的内容转换成所需数据类型
DataFlavor flavor = DataFlavor.stringFlavor;
//如果可以转换
if(contents.isDataFlavorSupported(flavor)){
String str;
try {//开始转换
str=(String)contents.getTransferData(flavor);
//如果要粘贴时，鼠标已经选中了一些字符
if(jta.getSelectedText()!=null){
//定位被选中字符的开始位置
int start = jta.getSelectionStart();
//定位被选中字符的末尾位置
int end = jta.getSelectionEnd();
//把粘贴的内容替换成被选中的内容
jta.replaceRange(str, start, end);
}else{
//获取鼠标所在TextArea的位置
int mouse = jta.getCaretPosition();
//在鼠标所在的位置粘贴内容
jta.insert(str, mouse);
}
} catch(UnsupportedFlavorException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch(IllegalArgumentException e){
e.printStackTrace();
}
}
}});
//查找
m23.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
final JDialog search=new JDialog();
JPanel jp = new JPanel();
JLabel lb1 = new JLabel("查找内容：");
final JTextField jtf = new JTextField(10);
JButton jbu = new JButton("查找下一个");
JButton jbu2 = new JButton("取消");
jp.add(lb1);jp.add(jtf);jp.add(jbu);jp.add(jbu2);
search.add(jp);
search.setSize(300, 200);
search.setLocation(450,350);
search.setVisible(true);
search.setTitle("查找");
jbu.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
String findText=jtf.getText();//查找的字符串
String textArea=jta.getText();//当前文本框的内容
start=textArea.indexOf(findText,end);
end=start+findText.length();
if(start==-1) { //没有找到
JOptionPane.showMessageDialog(null,"没找到"+findText,"记事本",JOptionPane.WARNING_MESSAGE);
jta.select(start, end);
}else{
jta.select(start,end);
}
}});
jbu2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
search.dispose();
}
});
}});
//替换
m24.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
final JDialog search=new JDialog();
JPanel jp = new JPanel();
JLabel lb1 = new JLabel("查找内容：");
JLabel lb2 = new JLabel("替换为：");
final JTextField jtf = new JTextField(10);
final JTextField jtf2 = new JTextField(10);
JButton jbu = new JButton("替换");
JButton jbu2 = new JButton("取消");
JButton jbu3 = new JButton("查找下一个");
jp.add(lb1);jp.add(jtf);jp.add(lb2);jp.add(jtf2);jp.add(jbu3);jp.add(jbu);jp.add(jbu2);
search.add(jp);
search.setSize(300, 200);
search.setLocation(450,350);
search.setVisible(true);
search.setTitle("替换");
jbu3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
String findText=jtf.getText();//查找的字符串
String textArea=jta.getText();//当前文本框的内容
start=textArea.indexOf(findText,end);
end=start+findText.length();
if(start==-1) { //没有找到
JOptionPane.showMessageDialog(null,"没找到"+findText,"记事本",JOptionPane.WARNING_MESSAGE);
jta.select(start, end);
}else{
jta.select(start,end);
}
}});
jbu.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
String changeText=jtf2.getText();//替换的字符串
jta.select(start, end);
jta.replaceSelection(changeText);
jta.select(start, end);
}});
jbu2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
search.dispose();
}
});
}});
//版权信息
m31.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
javax.swing.JOptionPane.showMessageDialog(null, "版权所有@D_xiao");
}});
}
public Test(String title){
super(title);
init();
this.setSize(585,450);
this.setVisible(true);
setLocationRelativeTo(null);
jta.setLineWrap(true);//自动换行，同时把横向滚动条隐去
}
public static void main(String[] args) {
Test chushi = new Test("记事本");
}
}