今天跟着教学视频做了一个简易版的聊天工具，算是对以前知识的一些小总结
主要包含异常，IO流，简单的网络编程(UDP传输),GUI的简单设计,多线程的一些知识点.
package com.zixue.haha;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Demo05_GUIChat {
/*
* GUI聊天
*/
public static void main(String[] args) {
new ZhuTi();
}
}
class ZhuTi extends Frame{
private TextField tf;
private Button send;
private Button log;
private Button clear;
private Button shake;
private TextArea viewText;
private TextArea sendText;
private DatagramSocket socket;
private BufferedWriter bw;
public ZhuTi() {
chuangti(); //创建一个窗体
southPanel(); //创建南边的panel
centerPanel(); //创建中间的panel
event(); //监听事件
}
public void event() {
this.addWindowListener(new WindowAdapter() { //窗口监听,关闭窗口
@Override
public void windowClosing(WindowEvent e) {
socket.close();
try {
bw.close();
} catch (IOException e1) {
e1.printStackTrace();
}
System.exit(0);
}
});
send.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
send();
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
log.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
logFile();
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
clear.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
viewText.setText("");
}
});
shake.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
send(new byte[] {-1},tf.getText()); //因为震动是点击震动按钮让对方震动,相当于给对方发送了一个象征着震动的信息
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
sendText.addKeyListener(new KeyAdapter() {
@Override
public void keyReleased(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_ENTER && e.isControlDown()) { //isControlDown() ctrl键是否被按下
try {
send();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
});
}
public void shake() {
int x = this.getLocation().x; //获取横坐标位置
int y = this.getLocation().y; //获取纵坐标位置
try {
this.setLocation(x+10, y);
Thread.sleep(20);
this.setLocation(x+10, y+10);
Thread.sleep(20);
this.setLocation(x-10, y+10);
Thread.sleep(20);
this.setLocation(x-10, y-10);
Thread.sleep(20);
this.setLocation(x, y);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void logFile() throws IOException {
bw.flush(); //刷新缓冲区
FileInputStream fis = new FileInputStream("config.txt"); //读取文件
ByteArrayOutputStream baos = new ByteArrayOutputStream(); //在内存中创建缓冲区
int len;
byte [] arr = new byte[8192];
while((len=fis.read(arr))!=-1) {
baos.write(arr,0,len);
}
String str = baos.toString(); //将内存中的内容转换成了字符串
viewText.setText(str);
fis.close();
}
private void send(byte[]arr,String ip) throws IOException {
DatagramPacket packet =
new DatagramPacket(arr,arr.length, InetAddress.getByName(ip), 9999);
socket.send(packet); //发送数据
}
private void send() throws IOException {
String message = sendText.getText(); //获取发送区域的内容
String ip = tf.getText(); //获取IP地址
ip=ip.trim().length()==0?"255.255.255.255":ip;
send(message.getBytes(),ip);
String time = getCurrentTime(); //获取当前时间
String str = time+" 我对:"+(ip.equals("255.255.255.255")?"所有人":ip)+"说\r\n"+message+"\r\n\r\n"; //alt+shift+l抽取局部变量
viewText.append(str); //将信息添加到显示区域中
bw.write(str); //将信息写到数据库中(用文本文档模拟的)
sendText.setText(""); //发送区域清空
}
public String getCurrentTime() {
Date d = new Date(); //创建当前日期对象
SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
return sdf.format(d); //将时间格式化返回
}
public void centerPanel() {
Panel center = new Panel(); //创建中间的panel
viewText = new TextArea();
sendText = new TextArea(5,1);
center.setLayout(new BorderLayout()); //设置为边界布局管理器
center.add(sendText,BorderLayout.SOUTH); //发送的文本区域在南边
center.add(viewText, BorderLayout.CENTER); //显示的区域放在中间
viewText.setEditable(false); //设置显示区域不可以编辑
viewText.setBackground(Color.WHITE); //设置显示区域的背景颜色
viewText.setFont(new Font("XXX", Font.PLAIN, 15));//设置显示区域字体
sendText.setFont(new Font("XXX", Font.PLAIN, 15));//设置发送区域字体
this.add(center,BorderLayout.CENTER); //将中间的panel放到frame中去
}
public void southPanel() {
Panel south = new Panel(); //创建南边的panel
tf = new TextField(15);
tf.setText("127.0.0.1");
send = new Button("发送");
log = new Button("记录");
clear = new Button("清屏");
shake = new Button("震动");
south.add(tf); //将文本字段加入到panel
south.add(send); //将按钮加入到panel
south.add(log);
south.add(clear);
south.add(shake);
this.add(south,BorderLayout.SOUTH); //将southPanel放在Frame的南边
}
public void chuangti() {
this.setLocation(500, 50); //设置位置
this.setSize(400, 600); //设置大小
new Receive().start();
try {
socket = new DatagramSocket();
bw = new BufferedWriter(new FileWriter("config.txt",true));
} catch (Exception e) {
e.printStackTrace();
}
this.setVisible(true); //设置可见
}
private class Receive extends Thread{ //接受和发送需要同时执行,所以定义成多线程
@Override
public void run() {
try {
DatagramSocket socket = new DatagramSocket(9999);
DatagramPacket packet = new DatagramPacket(new byte[8192], 8192);
while(true) {
socket.receive(packet); //接受信息
byte [] arr = packet.getData(); //获取字节数据
int len = packet.getLength(); //获取有效字节数据
if(arr[0]==-1&&len==1) { //如果发过来的数组第一个存储的值是-1,并且数组长度是1
shake(); //调用震动方法
continue; //如果出现这种情况,就跳出本次循环,因为震动后不需要执行下面的代码
}
String message = new String(arr, 0, len); //将数据转换成字符串
String time = getCurrentTime(); //获取当前时间
String ip = packet.getAddress().getHostAddress(); //获取ip
String str = time+" "+ip+" 对我说:\r\n"+message+"\r\n\r\n";
viewText.append(str);
bw.write(str);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
是有些简陋哈,嘿嘿!
再接再厉!