Java的GUI练习之——留言板实现

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代码实现如下：

package GUI;

importjava.awt.*;

importjava.awt.event.ActionEvent;

importjava.awt.event.ActionListener;

importjava.io.BufferedReader;

importjava.io.File;

importjava.io.FileOutputStream;

importjava.io.FileReader;

importjava.text.SimpleDateFormat;

importjava.util.Date;

importjavax.swing.*;

public classTestLiuyan extends JApplet {

private static final long serialVersionUID= -1859951364467014767L;

static JFrame frame = new JFrame();

// 创建一个容器

private JPanel jpComponents = newJPanel();

// 创建一个文本域

private JTextArea jtfDescription = newJTextArea();

static String text = null;

private JButton button_check = newJButton("查看/刷新留言");

private JButton button_add = newJButton("添加留言");

public static void main(String[] args) {

TestLiuyan applet = new TestLiuyan();

// EXIT_ON_CLOSE == 3

frame.setDefaultCloseOperation(3);

frame.setTitle("ShowLayout");

frame.add(applet);

//frame.getContentPane().add(applet);

// applet.init(); applet.start();

frame.setSize(400, 320);

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

public TestLiuyan() {

jpComponents.setLayout(newGridLayout(1, 2,2,4));

jpComponents.revalidate();

jtfDescription.setLineWrap(true);

jtfDescription.setWrapStyleWord(true);

jpComponents.add(button_check);

jpComponents.add(button_add);

JSplitPane jSplitPane = newJSplitPane(JSplitPane.VERTICAL_SPLIT,

jpComponents, newJScrollPane(jtfDescription));

add(jSplitPane,BorderLayout.CENTER);

addMyListener();

}

private void addMyListener() {

button_check.addActionListener(newActionListener() {

public voidactionPerformed(ActionEvent e) {

jtfDescription.setText("");

try {

BufferedReaderbr = new BufferedReader(new FileReader(

newFile("F://1.txt")));

String line;

while ((line =br.readLine()) != null) {

jtfDescription.append(line+ "\r\n");

}

br.close();

} catch (Exceptione2) {

}

});

button_add.addActionListener(newActionListener() {

//设置变量用于判断是否循环

boolean right;

public voidactionPerformed(ActionEvent e) {

try {

do{

right=false;

if(button_add.getText() == "添加留言") {

button_add.setText("提交留言");

jtfDescription.setText("");

} else{

button_add.setText("添加留言");

Filefile = new File("F://1.txt");

FileOutputStreamfos = new FileOutputStream(file,

true);

SimpleDateFormatsdf = new SimpleDateFormat(

"yyyy-MM-ddhh:mm:ss");

Stringdatetime = sdf.format(new Date());

text= jtfDescription.getText();

if(text.length() == 0) {

jtfDescription.append("留言为空，请重新输入");

}else {

fos.write(text.getBytes());

fos.write("\r\n".getBytes());

fos.write(datetime.getBytes());

Stringtext1 = "\r\n------------------------------------\r\n";

fos.write(text1.getBytes());

jtfDescription.setText("");

jtfDescription.append("留言添加成功");

fos.flush();

fos.close();

}

}while(right==true);

} catch (Exceptione1) {

}

});

}

如有疑问或发现问，欢迎讨论

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