/**
* 五个按钮的故事,西西哈。
*/
import java.awt.*
import java.awt.event.*
import java.io.*
public class FileMessage extends Frame implements ActionListener
{
private static final long serialVersionUID = 10L
Dialog dia
private Panel p
private File fi
Process po=null
private String s
private TextArea ta
private FileDialog fd
private Button b1,b2,b3,b4,b5
private Button b6
public FileMessage()
{
super("文本文件处理")
setBackground( Color.LIGHT_GRAY )
setLocation(200,300)
setResizable( false)
setVisible( true)
addWindowListener( new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit( 0)
}
})
}
public void init()
{
ta=new TextArea("\n\n\n\n\n\t\t\t\t文本显示区")
ta.setSize(30,5)
ta.setEditable(false)
add( ta,"North")
p=new Panel()
add( p,"Center")
b1=new Button("浏览")
b2=new Button("保存")
b3=new Button("清空")
b4=new Button("关闭")
b5=new Button("独立打开")
b6=new Button("确定")
p.add(b1)
p.add(b2)
p.add(b3)
p.add(b4)
p.add(b5)
b1.addActionListener(this)
b2.addActionListener(this)
b3.addActionListener(this)
b4.addActionListener(this)
b5.addActionListener(this)
b6.addActionListener(this)
fd=new FileDialog(this,"请选择文件",FileDialog.LOAD)
fd.setDirectory("f:\\note")
pack()
dia=new Dialog(this,"注意",true)
dia.setLayout(new BorderLayout())
Panel p1=new Panel()
p1.add( b6)
dia.add(new Label(" 请先选择文件"),BorderLayout.CENTER)
dia.add( p1,BorderLayout.SOUTH)
dia.addWindowListener( new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
dia.setVisible( false)
}
})
dia.setLocation(310,370)
dia.setSize(200,130)
}
public static void main(String[] args)
{
new FileMessage().init()
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==b1)
{
fd.setVisible(true)
s=fd.getDirectory()+fd.getFile()
fi=new File(s)
byte[] b=new byte[(int)fi.length()]
try
{
new FileInputStream(fi).read(b)
ta.setText(new String(b,0,(int)fi.length()))
}
catch(Exception e1){}
ta.setEditable(true)
}
else if(e.getSource()==b2)
{
try
{
if(ta.getText().equals("保存成功")||ta.getText() .equals( ""))
{}
else
{
new FileOutputStream(fi).write(ta.getText().getBytes())
ta.setText("保存成功")
ta.setEditable(false)
}
}
catch(FileNotFoundException e1)
{
ta.setText(e1.getMessage())
}
catch(IOException e1)
{
ta.setText("出现IOException异常")
}
}
else if(e.getSource()==b4)
System.exit(0)
else if(e.getSource()==b3)
{
ta.setText("")
ta.setEditable( false)
}
else if(e.getSource()==b5)
{
if(s==null)
{
dia.setVisible(true)
}
else
{
try
{
po=Runtime.getRuntime().exec("notepad.exe "+s)
}
catch(Exception ei)
{}
}
}
else if(e.getSource() ==b6)
{
dia.setVisible(false)
}
}
}
Java中读取txt文件可以使用file类先创建一个对象,然后使用I/O操作,进行读取或者写入操作,示例如下:\x0d\x0aimportjava.io.BufferedReader\x0d\x0aimportjava.io.File\x0d\x0aimportjava.io.FileInputStream\x0d\x0aimportjava.io.FileNotFoundException\x0d\x0aimportjava.io.FileOutputStream\x0d\x0aimportjava.io.IOException\x0d\x0aimportjava.io.InputStreamReader\x0d\x0aimportjava.io.PrintWriter\x0d\x0a\x0d\x0apublicclassdemo2{\x0d\x0aprivatestaticStringpath="f:/demo1.txt"\x0d\x0aprivatestaticFilefile\x0d\x0astatic{\x0d\x0afile=newFile(path)\x0d\x0aif(!file.exists()){\x0d\x0atry{\x0d\x0afile.createNewFile()\x0d\x0a}catch(IOExceptione){\x0d\x0ae.printStackTrace()\x0d\x0a}\x0d\x0a}\x0d\x0a}\x0d\x0a\x0d\x0apublicstaticvoidmain(String[]args)throwsIOException{\x0d\x0aStudentstu=newStudent(1,"张三",90)\x0d\x0awriteDataToFile(file,stu)\x0d\x0areadDataFromFile(file)\x0d\x0a}\x0d\x0a\x0d\x0aprivatestaticvoidreadDataFromFile(Filefile)throwsIOException{\x0d\x0aBufferedReaderreader=newBufferedReader(newInputStreamReader(newFileInputStream(file)))\x0d\x0aStringstr=""\x0d\x0awhile((str=reader.readLine())!=null){\x0d\x0aString[]stuInfo=str.split(",")\x0d\x0aSystem.out.println("学号:"+stuInfo[0]+"姓名:"+stuInfo[1]+"score:"+stuInfo[2])\x0d\x0a}\x0d\x0a}\x0d\x0a\x0d\x0aprivatestaticvoidwriteDataToFile(Filefile,Studentstu)throwsFileNotFoundException{\x0d\x0aPrintWriterout=newPrintWriter(newFileOutputStream(file,true))\x0d\x0aout.println(stu.toString())\x0d\x0aout.close()\x0d\x0a}\x0d\x0a}Java注册用户MySQL储存文件可以放在MySQL数据库中,即使用MySQL中的BLOB(Binary Large Object)类型来存储文件。首先,需要创建一个存储文件的字段,类型为BLOB。然后,使用Java代码将文件读取到字节数组中,最后使用PreparedStatement对象将字节数组插入到数据库中。