java对文件的读取和保存操作，java读取保存,import java.

java对文件的读取和保存操作，java读取保存,import java.

import java.awt.FlowLayout;import java.awt.TextArea;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.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.text.SimpleDateFormat;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;public class ReadAndWriteText extends JFrame implements ActionListener{    TextArea text=new TextArea(15,30);    JButton Read=new JButton("读取文件");    JButton Save=new JButton("保存文件");    JPanel btnpnl=new JPanel();    File file=new File("text.txt");    ReadAndWriteText(){         btnpnl.setLayout(new FlowLayout(FlowLayout.CENTER,20,20));         btnpnl.add(Read);         btnpnl.add(Save);         Read.addActionListener(this);         Save.addActionListener(this);         this.setLayout(new FlowLayout());         this.add(btnpnl);         this.add(text);         this.setBounds(450, 150, 300, 400);         this.setVisible(true);         this.validate();         this.setDefaultCloseOperation(EXIT_ON_CLOSE);    }    private void save()    {        System.out.println(file.getAbsolutePath());//获得绝对路径        try {            FileWriter fw=new FileWriter(file);            BufferedWriter bfw=new BufferedWriter(fw);            String str=new String();            str=text.getText();            bfw.write(str, 0, str.length());            bfw.flush();        } catch (IOException e1) {            // TODO Auto-generated catch block            e1.printStackTrace();        }    }    private void read() {        // TODO Auto-generated method stub        try {            FileReader fr=new FileReader(file);            BufferedReader bfr=new BufferedReader(fr);            String str=new String();            while((str=bfr.readLine())!=null){                text.append(str+"\n");            }        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    @Override     public void actionPerformed(ActionEvent e) {        // TODO Auto-generated method stub        if(Save==e.getSource()){            save();            System.out.print("writing");        }        if(Read==e.getSource()){            read();            System.out.print("reading");        }    }    public static void main(String []args){        new ReadAndWriteText();       // System.out.println((new SimpleDateFormat("yyyy-MM-dd HH:mm:ssss")).format(time2));    }}