编写广播数据类
package com.zy.java.service;
import java.io.*;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.net.UnknownHostException;
/**
* @author
* @date 2019/7/31 18:32
*/
public class BroadcastService extends Thread {
//获取目录下的二进制文件(.bat)
private String url = System.getProperty("user.dir")+"\src\main\resources\data";
private String IP = "224.23.55.14";
private int port = 9898;
InetAddress address = null;
MulticastSocket socket = null;
public static void main(String[] args) {
BroadcastService service = new BroadcastService();
service.start();
}
public BroadcastService() {
try {
address = InetAddress.getByName(IP);
socket = new MulticastSocket(port);
socket.setTimeToLive(1);
socket.joinGroup(address);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void run() {
get16byte();
}
public void get16byte(){
File dir = new File(url);
if (!dir.exists()) {
dir.mkdirs();
}
//获取目录下file集合
File[] files = dir.listFiles();
for (int i = 0; i < files.length; i++) {
try {
DatagramPacket packet = null;
File binFile = new File(files[i].getPath());
DataInputStream dataIn = new DataInputStream(new FileInputStream(binFile));
StringBuffer hexString = new StringBuffer();
String str = "";
byte temp = 0;
int count = 0;
String counts = null;
for(int j = 0; j < binFile.length(); j++){
temp = dataIn.readByte();
str = Integer.toHexString(temp);
if (str.length() == 8) {
str = str.substring(6);
} else if (str.length() == 1) {
str = "0" + str;
}
hexString.append(str.toUpperCase());
if(hexString.length() % 16 == 0 && j < binFile.length()-1){
count++;
if(count < 10){
counts = "0"+count;
System.out.println(" --- 满16位输出["+counts+"] : "+hexString.toString()+" --- ");
}else{
System.out.println(" --- 满16位输出["+count+"] : "+hexString.toString()+" --- ");
}
byte[] buff = hexStringToByteArray(hexString.toString());
packet = new DatagramPacket(buff, buff.length, address, port);
socket.send(packet);
hexString.delete(0,hexString.length());
sleep(1000);
}
if(j == binFile.length()-1){
System.out.println(" --- 最后输出 : "+hexString.toString()+" --- ");
byte[] buff = hexStringToByteArray(hexString.toString());
packet = new DatagramPacket(buff, buff.length, address, port);
socket.send(packet);
sleep(1000);
}
str="";
}
dataIn.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public byte[] hexStringToByteArray(String hexString){
hexString = hexString.replace(" ","");
int len = hexString.length();
byte[] bytes = new byte[len / 2];
for(int i = 0;i < len; i+= 2){
bytes[i / 2] = (byte)((Character.digit(hexString.charAt(i), 16) << 4) + Character.digit(hexString.charAt(i+1), 16));
}
return bytes;
}
}
编写广播接收类
package com.zy.java.service;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.net.UnknownHostException;
/**
* @author
* @date 2019/7/30 09:40
*/
//@RestController
public class ListenInService extends JFrame implements Runnable, ActionListener {
private static final char HexCharArr[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
//端口
private static int port = 9898;
//IP
private static String IP = "224.23.55.14";
private static InetAddress group = null;
//开始按钮
private JButton button_begin;
//结束按钮
private JButton button_stop;
private JTextArea textArea_1;
// private JTextArea textArea_2;
//线程
private Thread thread;
private MulticastSocket socket = null;
private boolean flag = false;
public static void main(String[] args) {
ListenInService service = new ListenInService();
service.setVisible(true);
}
public ListenInService(){
setTitle("UDP实现接收广播数据报");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(200, 250, 350, 150);
JPanel panel = new JPanel(new FlowLayout());
button_begin = new JButton("开始接收");
panel.add(button_begin);
button_begin.addActionListener(this);
button_stop = new JButton("停止接收");
panel.add(button_stop);
button_stop.addActionListener(this);
getContentPane().add(panel, BorderLayout.NORTH);
JPanel panel_1 = new JPanel(new GridLayout(1, 2));
textArea_1 = new JTextArea();
textArea_1.setLineWrap(true);
panel_1.add(textArea_1);
/*textArea_2 = new JTextArea();
textArea_2.setLineWrap(true);
panel_1.add(textArea_2);*/
getContentPane().add(panel_1, BorderLayout.CENTER);
thread = new Thread(this);
validate();
try {
group = InetAddress.getByName(IP);
socket = new MulticastSocket(port);
socket.joinGroup(group);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == button_begin){
if(!thread.isAlive()){
thread = new Thread(this);
}
thread.start();
flag = false;
}
if(e.getSource() == button_stop){
flag = true;
}
}
@Override
public void run() {
String counts = null;
int count = 0;
while(!flag){
count++;
byte[] buff = new byte[16];
DatagramPacket packet = null;
packet = new DatagramPacket(buff, 0, buff.length);
try {
socket.receive(packet);
byte[] bytes = packet.getData();
String value = byteArrToHex2(bytes);
value = value.substring(0,value.length()/2);
textArea_1.setText(" --- 实时接收内容 打印 :");
textArea_1.append("
接收次数:"+count+" "+value);
InetSocketAddress address = (InetSocketAddress)packet.getSocketAddress();
if(count < 10){
counts = "0"+count;
System.out.println(" -- 来源IP["+address.toString()+"],接收值["+counts+"] : "+value+" --- ");
}else{
System.out.println(" -- 来源IP["+address.toString()+"],接收值["+count+"] : "+value+" --- ");
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
public String byteArrToHex(byte[] btArr){
char strArr[] = new char[btArr.length * 2];
int i = 0;
for(byte bt : btArr){
strArr[i++] = HexCharArr[bt>>>4 & 0xf];
strArr[i++] = HexCharArr[bt & 0xf];
}
return new String(strArr);
}
public String byteArrToHex2(byte[] btArr){
StringBuffer sb = new StringBuffer(btArr.length);
for(int i = 0; i < btArr.length; i++){
sb.append(Integer.toString((btArr[i] & 0xFF) + 0x100, 16).substring(1).toUpperCase());
}
return sb.toString();
}
}