javaswing的⼀个简单例⼦-⾯板的使⽤-标签换⾏-存取⽂件swing
java swing是轻量级的⽤来开发跨平台图形界⾯的库。
不是特别常⽤，也不是特别好⽤。
以下是⼀个基本⽤法的例⼦。基本涵盖了⼤部分内容。
例⼦
代码
import java.awt.*;
import java.awt.event.*;
import java.util.Date;
import java.io.*;
import javax.swing.*;
public class Main extends JFrame {
//组件区
final JPanel topPanel =new JPanel();
final JPanel bottomPanel =new JPanel();
final JPanel rightPanel =new JPanel();
final JScrollPane topPane =new JScrollPane(topPanel);
final JSplitPane splitLeft =new  JSplitPane(JSplitPane.VERTICAL_SPLIT, topPane, bottomPanel);
javaswing酷炫界面
final JTextArea text =new JTextArea();
final JButton sendBtn =new JButton("发送消息");
final JButton saveBtn =new JButton("保存消息");
final JButton saveBtn =new JButton("保存消息");
final JButton readBtn =new JButton("读⼊消息");
final JButton clearBtn =new JButton("清空消息");
final JLabel  tipLabel =new JLabel("正常");
public Main()
{
/
/组件设置区
this.add(splitLeft, BorderLayout.CENTER);
this.add(rightPanel, BorderLayout.EAST);
splitLeft.setDividerLocation(400);
rightPanel.setPreferredSize(new Dimension(100,0));
rightPanel.add(sendBtn);
rightPanel.add(saveBtn);
rightPanel.add(readBtn);
rightPanel.add(clearBtn);
rightPanel.add(tipLabel);
topPanel.setLayout(new BoxLayout(topPanel, BoxLayout.Y_AXIS));
bottomPanel.setLayout(new BorderLayout());
bottomPanel.add(text, BorderLayout.CENTER);
//事件绑定区
//发送消息
sendBtn.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e){
String text1 =new Date().toLocaleString();
String text2 ="<html><body><font color=#c3c3c3>"+ Text().replaceAll("\n","<br/>")+"</font></body></html>"; setMsg(text1, text2);
}
});
//保存消息
saveBtn.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e){
File file =new File("pro.dat");
try{
}catch(IOException e1){
tipLabel.setText("保存失败");
return;
}
FileWriter rw = null;
try{
rw =new FileWriter(file);
}catch(IOException e1){
tipLabel.setText("⽂件打开失败");
return;
}finally
{
for(int i =0; i < ComponentCount(); i++)
{
JLabel label =(JLabel) Component(i);
try{
rw.Text()+"\n");
//System.out.Text());
}catch(IOException e1){
}catch(IOException e1){
tipLabel.setText("写出错");
try{
rw.close();
}catch(IOException e2){
}
return;
}
}
try{
rw.close();
}catch(IOException e1){
}
}
tipLabel.setText("写成功：pro.dat");
}
});
//读⼊消息
readBtn.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e){
FileReader fr = null;
try{
fr =new FileReader("pro.dat");
}catch(FileNotFoundException e1){
tipLabel.setText("⽂件不存在");
return;
}
BufferedReader br =new BufferedReader(fr); while(true)
{
String line1;
String line2;
try{
line1 = br.readLine();
line2 = br.readLine();
}catch(IOException e1){
tipLabel.setText("读取异常");
return;
}
if(line1 == null || line2 == null)
{
break;
}else
{
setMsg(line1, line2);
}
}
tipLabel.setText("读取成功");
try{
br.close();
fr.close();
}catch(IOException e1){
}
return;
}
}
});
//清空消息
clearBtn.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e){
topPanel.updateUI();
}
});
}
//⾃定义函数区
//发送消息的⼯具函数
public void setMsg(String text1, String text2)
{
JLabel label1 =new JLabel();
JLabel label2 =new JLabel();
label1.setText(text1);
label2.setText(text2);
label1.setForeground(Color.RED);
topPanel.add(label1);
topPanel.add(label2);
text.setText("");
topPanel.updateUI();
}
public static void main(String[] args){
//窗⼝设置区
JFrame frame =new Main();
frame.setSize(800,600);
frame.setLocation(0,0);
frame.setBackground(Color.GRAY);
frame.setTitle("我的窗⼝");
frame.setVisible(true);
}
}

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