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分享JAVA局域网广播 其他机器收不到。
本人接触JAVA 一个多月了 自己写了个 局域网聊天 传文件 和群聊的小软件。群聊不是用的服务器客户端的模式，而是直接在局域网中用 multiCastSocket进行广播。但是 自己的机器上不管能收到广播，在局域网其他的机器上就收不到。也在网上查了很久，没找到相似的情况。纠结了两天了。于是想在这里来问问大家 代码很长 我贴出个我广播自己在线，和在线用户查询的代码。
//广播自己在线的类
package lMess;
//服务端代码：不断广播--自身信息
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.net.*;
public class BroadCast extends Thread {
String message;
int port = 50611;
InetAddress group = null;
MulticastSocket socket = null;
private javax.swing.JTextField userNameArea;
String ip;
BroadCast(javax.swing.JTextField userNameArea) {
this.userNameArea = userNameArea;
File ipFile = new File("ipBroadCast.ini");
try {
if (ipFile.exists()) {
BufferedReader reader = new BufferedReader(new FileReader(
"ipBroadCast.ini"));
try {
ip = reader.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
group = InetAddress.getByName(ip);
socket = new MulticastSocket(port);
socket.setTimeToLive(0);
socket.joinGroup(group);
} catch (Exception e) {
}
}
public void run() {
while (true) {
try {
DatagramPacket packet = null;
message = "USER:" + userNameArea.getText() + " @ "
+ InetAddress.getLocalHost();
byte data[] = message.getBytes();
packet = new DatagramPacket(data, data.length, group, port);
System.out.println(new String(data));
socket.send(packet);
sleep(4000);
} catch (Exception e) {
}
}
}
}
//接受广播的类
package lMess;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.net.UnknownHostException;
import javax.swing.JButton;
import javax.swing.JTextArea;
public class UsersFinding implements Runnable {
private javax.swing.JTextArea usersList;
int port = 50611;
InetAddress group = null;
MulticastSocket socket = null;
JButton startReceive, stopReceive;
JTextArea showArea;
Thread thread;
boolean stop = false;
String ip;
public UsersFinding(javax.swing.JTextArea usersList) {
this.usersList = usersList;
File ipFile = new File("ipBroadCast.ini");
try {
if (ipFile.exists()) {
BufferedReader reader = new BufferedReader(new FileReader(
"ipBroadCast.ini"));
try {
ip = reader.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
public void run() {
try {
while (true) {
group = InetAddress.getByName(ip);
socket = new MulticastSocket(port);
socket.joinGroup(group);
byte[] buffer = new byte[256];
DatagramPacket dgp = new DatagramPacket(buffer, buffer.length);
socket.receive(dgp);
byte[] getMessage = new byte[dgp.getLength()];
System.arraycopy(dgp.getData(), 0, getMessage, 0,
dgp.getLength());
String get = new String(getMessage);
System.out.println("UsersFinding get the Message:\n" + get);
if (get.indexOf("USER") == 0) {// 说明是用户信息 获取
if (this.usersList.getText().indexOf(get) < 0) {
this.usersList.append(get + "\n");
}
}
if (get.indexOf("LEAVE") == 0) {
String date = get
.substring("LEAVE:".length(), get.length());
String list = this.usersList.getText();
this.usersList
.setText(list.substring(0, list.indexOf(date))
+ list.substring(
list.indexOf(date) + date.length(),
list.length()));
}
if (get.indexOf("CHANGE") == 0) {// 删除操作 同上
String date = get.substring("CHANGE:".length(),
get.length());
String list = this.usersList.getText();
this.usersList
.setText(list.substring(0, list.indexOf(date))
+ list.substring(
list.indexOf(date) + date.length(),
list.length()));
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
大家谁能帮我看看。新手 很多东西不是很懂。
第一次用CSDN 也不知道积分是什么东西。也不知道自己有没有积分，默认值是40 就设个40.希望好心人帮我解答一下问题。积分我有一定给。谢谢大家了。
//广播自己在线的类
package lMess;
//服务端代码：不断广播--自身信息
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.net.*;
public class BroadCast extends Thread {
String message;
int port = 50611;
InetAddress group = null;
MulticastSocket socket = null;
private javax.swing.JTextField userNameArea;
String ip;
BroadCast(javax.swing.JTextField userNameArea) {
this.userNameArea = userNameArea;
File ipFile = new File("ipBroadCast.ini");
try {
if (ipFile.exists()) {
BufferedReader reader = new BufferedReader(new FileReader(
"ipBroadCast.ini"));
try {
ip = reader.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
group = InetAddress.getByName(ip);
socket = new MulticastSocket(port);
socket.setTimeToLive(0);
socket.joinGroup(group);
} catch (Exception e) {
}
}
public void run() {
while (true) {
try {
DatagramPacket packet = null;
message = "USER:" + userNameArea.getText() + " @ "
+ InetAddress.getLocalHost();
byte data[] = message.getBytes();
packet = new DatagramPacket(data, data.length, group, port);
System.out.println(new String(data));
socket.send(packet);
sleep(4000);
} catch (Exception e) {
}
}
}
}
//接受广播的类
package lMess;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.net.UnknownHostException;
import javax.swing.JButton;
import javax.swing.JTextArea;
public class UsersFinding implements Runnable {
private javax.swing.JTextArea usersList;
int port = 50611;
InetAddress group = null;
MulticastSocket socket = null;
JButton startReceive, stopReceive;
JTextArea showArea;
Thread thread;
boolean stop = false;
String ip;
public UsersFinding(javax.swing.JTextArea usersList) {
this.usersList = usersList;
File ipFile = new File("ipBroadCast.ini");
try {
if (ipFile.exists()) {
BufferedReader reader = new BufferedReader(new FileReader(
"ipBroadCast.ini"));
try {
ip = reader.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
public void run() {
try {
while (true) {
group = InetAddress.getByName(ip);
socket = new MulticastSocket(port);
socket.joinGroup(group);
byte[] buffer = new byte[256];
DatagramPacket dgp = new DatagramPacket(buffer, buffer.length);
socket.receive(dgp);
byte[] getMessage = new byte[dgp.getLength()];
System.arraycopy(dgp.getData(), 0, getMessage, 0,
dgp.getLength());
String get = new String(getMessage);
System.out.println("UsersFinding get the Message:\n" + get);
if (get.indexOf("USER") == 0) {// 说明是用户信息 获取
if (this.usersList.getText().indexOf(get) < 0) {
this.usersList.append(get + "\n");
}
}
if (get.indexOf("LEAVE") == 0) {
String date = get
.substring("LEAVE:".length(), get.length());
String list = this.usersList.getText();
this.usersList
.setText(list.substring(0, list.indexOf(date))
+ list.substring(
list.indexOf(date) + date.length(),
list.length()));
}
if (get.indexOf("CHANGE") == 0) {// 删除操作 同上
String date = get.substring("CHANGE:".length(),
get.length());
String list = this.usersList.getText();
this.usersList
.setText(list.substring(0, list.indexOf(date))
+ list.substring(
list.indexOf(date) + date.length(),
list.length()));
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
大家谁能帮我看看。新手 很多东西不是很懂。
第一次用CSDN 也不知道积分是什么东西。也不知道自己有没有积分，默认值是40 就设个40.希望好心人帮我解答一下问题。积分我有一定给。谢谢大家了。
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zhixiongliu 2013-08-04
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我也遇到这样的问题，在网上找了一些试了一下，在一台机器上开多个客户端是可以，但是同一局域网中两台PC之间就是不行，这里已经s.setTimeToLive(1)，期待回答
import java.net.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import javax.swing.*;
public class MutilCast {
public static void main(String[] args)
{
MulticastSocket s = null;
InetAddress group = null;
JPanel northPanel =new JPanel();
JPanel southPanel =new JPanel();
JPanel namePanel =new JPanel(new FlowLayout());
JLabel sendLabel =new JLabel("发送内容：");
JLabel nameChangeLabel =new JLabel("给自己起个名字：");
final JTextField nameSpace =new JTextField(20);
final JTextArea messageArea =new JTextArea("",20,20);
final JTextField sendField =new JTextField(30);
JScrollPane message =new JScrollPane(messageArea);
JButton sendButton =new JButton("发送");
JButton saveButton =new JButton("保存记录");
JButton clearUpButton =new JButton("清空面板");
Box centerBox =Box.createVerticalBox();
namePanel.add(nameChangeLabel);
namePanel.add(nameSpace);
centerBox.add(namePanel);
centerBox.add(message);
//实现组播数据传送的配置信息
try {
group = InetAddress.getByName("228.9.6.8");
} catch (UnknownHostException e1) {
System.out.println("组播地址绑定失败");
}
try {
s = new MulticastSocket(6789);
s.setTimeToLive(1);
} catch (IOException e1) {
System.out.println("组播地址创建失败");
}
try {
s.joinGroup(group);
} catch (IOException e1) {
System.out.println("组播地址加入失败");
}
//end实现组播数据传送的配置信息
//“发送”按钮实现信息功能的发送部分
class SendMsg implements ActionListener
{
String msg=null;
MulticastSocket s=null;
InetAddress group = null;
public SendMsg(MulticastSocket s,InetAddress group)
{
this.s=s;
this.group=group;
}
public void actionPerformed(ActionEvent e)
{
try
{
//如果名字为空 给出提示信息
if(nameSpace.getText().isEmpty())
new JOptionPane().showMessageDialog(null, "请一定要取别名！");
else
{
//如果名字不为空 则把名字添加到数据报头
msg=(nameSpace.getText()+"说："+sendField.getText());
DatagramPacket data=
new DatagramPacket(msg.getBytes(),msg.getBytes().length,group, 6789);
s.send(data);
}
}
catch (IOException e1) {
System.out.println("发送失败");
}
}
}
//实现数据报的接受线程
class recevMsg extends Thread
{
MulticastSocket s=null;
public recevMsg(MulticastSocket s)
{
this.s=s;
};
public void run()
{
byte[] buf = new byte[100];
DatagramPacket recv = new DatagramPacket(buf, buf.length);
try
{
while(true)
{
s.receive(recv);
String str=new String(recv.getData());
String line =System.getProperty("line.separator");
messageArea.append(str);
messageArea.append(line);
}
}
catch (IOException e1)
{
System.out.println("接受失败");
}
}
}
//聊天记录的保存 保存在当前位置下的"Note.txt"文件中
class SaveMsg implements ActionListener
{
String msg=null;
String line =System.getProperty("line.separator");
public void actionPerformed(ActionEvent e)
{
try
{
msg=messageArea.getText();
FileOutputStream Note=new FileOutputStream("Note.txt");
messageArea.append("记录已经保存在Note.txt");
Note.write(msg.getBytes());
messageArea.append(line);
Note.close();
}
catch (IOException e1) {
System.out.println("发送失败");
}
}
}
//清除面板上的聊天记录
class ClearMsg implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
try
{
messageArea.setText("");
}
catch (Exception e1) {
System.out.println("清空失败");
}
}
}
JFrame mutilCastFrame=new JFrame("组播聊天工具");
northPanel.add(sendLabel);
northPanel.add(sendField);
northPanel.add(sendButton);
southPanel.add(saveButton);
southPanel.add(clearUpButton);
mutilCastFrame.getContentPane().add(northPanel,"North");
mutilCastFrame.getContentPane().add(southPanel,"South");
mutilCastFrame.getContentPane().add(centerBox,"Center");
mutilCastFrame.setDefaultCloseOperation(mutilCastFrame.EXIT_ON_CLOSE);
sendButton.addActionListener(new SendMsg(s,group));
saveButton.addActionListener(new SaveMsg());
clearUpButton.addActionListener(new ClearMsg());
mutilCastFrame.setSize(500, 500);
mutilCastFrame.setLocation(200, 200);
mutilCastFrame.show();
recevMsg r=new recevMsg(s);
r.start();
}
}
akemi_homura 2012-02-08
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额 7楼说的是，这个SSL 我倒是想到过的 只是没注意自己设的是0 改成1就OK了。
akemi_homura 2012-02-07
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恩 7楼给的建议我明天去机房试试 现在只有一台电脑没办法测试。 不过 局域网内0就可以了吧？还是设为1 我先去试试明天。
周靖峰 2012-02-07
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楼主，可能是你的ttl有问题吧
你把0改为255试试
socket.setTimeToLive(0);
你把0改为255试试
akemi_homura 2012-02-07
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这个 还是不知道怎么回复到指定的人，，局域网倒是自己的，
xkjflyzz 2012-02-07
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你得自己架了局域网！如果你通过ISP的路由器！它肯定不会让你广播的！
akemi_homura 2012-02-07
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我不知道怎么回复到对应的一个人， 3楼说的 我在自己的电脑上用网络地址。255的方法 都不行。
xkjflyzz 2012-02-07
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怎么你还在使用多播哦！这个目前网络都不太支持的！你要广播就用网络地址.255就可以了！而且一般的路由器都不允许你使用广播的！会丢掉这个包
akemi_homura 2012-02-07
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恩 我用的ipBroadCast.ini 文件设置的IP 确实设置的是D类IP 而且是一般的局域网的那个广播地址 貌似不行。用224.0.0.0-239.255.255.255 之间的才能在自己机器上收到 但是 机器收不到
yaoweijq 2012-02-07
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我怎么记得局域网广播得用专门的地址？
