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JavaSE/JavaIO/NotePad.java at master · goder/JavaSE · GitHub
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NotePad.java
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NotePad.java
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/*
* 功能：模拟一个简单的记事本，利用绘绘画、字符流进行实现
* 1、菜单：JMenuBar->JMenu->JMenuItem
* 菜单条（最顶层）->菜单（包含在菜单条中）->菜单项（包含在菜单中）
*/
package
com
.
bj
.
io
;
import
javax
.
swing
.*;
import
java
.
awt
.*;
import
java
.
awt
.
event
.
ActionEvent
;
import
java
.
awt
.
event
.
ActionListener
;
import
java
.
io
.*;
import
javax
.
swing
.
event
.*;
public
class
NotePad
extends
JFrame
implements
ActionListener
{
//定义文本域
JTextArea
jta
=
null
;
//定义菜单条
JMenuBar
jmb
=
null
;
//定义菜单
JMenu
jm
=
null
;
//定义菜单项,打开
JMenuItem
jmi
=
null
;
//定义菜单项，保存
JMenuItem
jmi2
=
null
;
//定义菜单项，退出
JMenuItem
jmi3
=
null
;
//JScollPane组件
JScrollPane
jsp
=
null
;
public
static
void
main
(
String
[]
args
) {
// TODO Auto-generated method stub
NotePad
np
=
new
NotePad
();
}
public
NotePad
(){
jta
=
new
JTextArea
();
jsp
=
new
JScrollPane
(
jta
);
jmb
=
new
JMenuBar
();
jm
=
new
JMenu
(
"文件"
);
//jmi=new JMenuItem("打开", new ImageIcon("images/notepad3.jpg"));//带图标菜单项
jmi
=
new
JMenuItem
(
"打开"
);
jmi2
=
new
JMenuItem
(
"保存"
);
jmi3
=
new
JMenuItem
(
"退出"
);
//注册打开事件
jmi
.
addActionListener
(
this
);
jmi
.
setActionCommand
(
"open"
);
//注册保存事件
jmi2
.
addActionListener
(
this
);
jmi2
.
setActionCommand
(
"save"
);
//注册退出事件
jmi3
.
addActionListener
(
this
);
jmi3
.
setActionCommand
(
"exit"
);
//把jm加入jmb中
jmb
.
add
(
jm
);
//把jmi加入jm中
jm
.
add
(
jmi
);
jm
.
add
(
jmi2
);
jm
.
add
(
jmi3
);
//把jsp加入
this
.
add
(
jsp
);
//设置jmb
this
.
setJMenuBar
(
jmb
);
this
.
setSize
(
800
,
800
);
this
.
setLocation
(
100
,
100
);
this
.
setTitle
(
"记事本"
);
this
.
setIconImage
(
new
ImageIcon
(
"images/notepad3.jpg"
).
getImage
());
this
.
setDefaultCloseOperation
(
JFrame
.
EXIT_ON_CLOSE
);
this
.
setVisible
(
true
);
}
@
Override
public
void
actionPerformed
(
ActionEvent
e
) {
// TODO Auto-generated method stub
int
option
=-
1
;
if
(
e
.
getActionCommand
().
equals
(
"open"
)){
//JFileChooser文件选择器
JFileChooser
jfc
=
new
JFileChooser
();
//设置窗口title
jfc
.
setDialogTitle
(
"打开文件"
);
//打开窗口，同时返回对话框最终状态，确认或取消
option
=
jfc
.
showOpenDialog
(
null
);
//显示窗口
jfc
.
setVisible
(
true
);
//判断按键是确认，再做下步操作
if
(
option
==
jfc
.
APPROVE_OPTION
){
//得到文件绝对路径
String
filepath
=
jfc
.
getSelectedFile
().
getAbsolutePath
();
FileReader
fr
=
null
;
BufferedReader
br
=
null
;
try
{
//先创建FileReader
fr
=
new
FileReader
(
filepath
);
//新建BufferedReader
br
=
new
BufferedReader
(
fr
);
String
s
=
""
;
String
str
=
""
;
//循环读取数据,缓存流进行读取,返回每行读取的数据，赋值给s
while
(
null
!=(
s
=
br
.
readLine
())){
str
+=
s
+
"
\r
\n
"
;
}
//设置JTextArea文本显示
this
.
jta
.
setText
(
str
);
}
catch
(
Exception
e1
) {
// TODO Auto-generated catch block
e1
.
printStackTrace
();
}
finally
{
try
{
br
.
close
();
fr
.
close
();
}
catch
(
IOException
e1
) {
// TODO Auto-generated catch block
e1
.
printStackTrace
();
}
}
}
}
if
(
e
.
getActionCommand
().
equals
(
"save"
)){
//使用JFileChooser
JFileChooser
jfc
=
new
JFileChooser
();
//jfc设置title
jfc
.
setDialogTitle
(
"另存为"
);
//jfc保存窗口
option
=
jfc
.
showSaveDialog
(
null
);
//设置窗口可见
jfc
.
setVisible
(
true
);
if
(
option
==
jfc
.
APPROVE_OPTION
){
//获取文件绝对路径
String
filepath
=
jfc
.
getSelectedFile
().
getAbsolutePath
();
FileWriter
fw
=
null
;
BufferedWriter
bw
=
null
;
try
{
fw
=
new
FileWriter
(
filepath
);
bw
=
new
BufferedWriter
(
fw
);
String
text
=
this
.
jta
.
getText
();
//把JTextArea中文本，按行存入数组
String
s
[]=
text
.
split
(
"
\n
"
);
//通过循环把每一行写入文件中
for
(
int
i
=
0
;
i
<
s
.
length
;
i
++){
bw
.
write
(
s
[
i
]+
"
\r
\n
"
);
}
}
catch
(
Exception
e1
) {
// TODO Auto-generated catch block
e1
.
printStackTrace
();
}
finally
{
try
{
bw
.
close
();
fw
.
close
();
}
catch
(
IOException
e1
) {
// TODO Auto-generated catch block
e1
.
printStackTrace
();
}
}
}
}
if
(
e
.
getActionCommand
().
equals
(
"exit"
)){
//退出、关闭程序
System
.
exit
(
0
);
}
}
}
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