package jnet;

//英汉小词典  随机存取文件   需改进 version1.0

import java.io.*;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class F extends JFrame implements ActionListener{

File file = new File("英汉小词典.txt");

JButton writeBtn = new JButton("录入");

JButton viewBtn = new JButton("显示");

JTextField word = new JTextField(8);

JTextField note = new JTextField(8);

JTextArea txt = new JTextArea(20,30);

JPanel p1 = new JPanel();

JPanel p2 = new JPanel();

F(){

setTitle("英汉小词典");

setBounds(100,50,400,250);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

add(p1,"North");

p1.setBackground(Color.cyan);

p1.add(new JLabel("输入单词"));

p1.add(word);

p1.add(new JLabel("输入解释"));

p1.add(note);

p1.add(writeBtn);

writeBtn.addActionListener(this);

add(p2,"Center");

p2.add(viewBtn);

p2.add(txt);

viewBtn.addActionListener(this);

validate();

}

@Override

public void actionPerformed(ActionEvent e) {

if (e.getSource()==writeBtn) {

inputWord();

}

if (e.getSource()==viewBtn) {

viewWord();

}

}

//显示汉语解释的方法

public void viewWord()

{

int number=1;

try {

@SuppressWarnings("resource")

RandomAccessFile infile = new RandomAccessFile(file, "rw");

@SuppressWarnings("unused")

String 单词 =null;

while((单词=infile.readUTF())!=null)

{

txt.append("\n"+number+单词);

txt.append(" " + infile.readUTF());  //读取汉语解释

txt.append("\n--------------------");

number++;

}

infile.close();

} catch (Exception e) {

e.printStackTrace();

}

}

//处理输入的单词的

public void inputWord()

{

try {

RandomAccessFile outfile = new RandomAccessFile(file, "rw");

if (file.exists()) {

//实现指针跳到文件末尾

long length = file.length();

outfile.seek(length);

}

outfile.writeUTF("单词:"+word.getText());

outfile.writeUTF("解释:"+note.getText());

outfile.close();

} catch (Exception e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

new F();

}

}