JGroups实现聊天小程序
本文实例为大家分享了JGroups实现聊天小程序的具体代码，供大家参考，具体内容如下
效果图：
代码部分：
package com.lei.jgoups;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.LinkedList;
import java.util.List;
import org.jgroups.JChannel;
import org.jgroups.Message;
import org.jgroups.ReceiverAdapter;
import org.jgroups.View;
import org.jgroups.util.Util;
public class SimpleChat extends ReceiverAdapter{
JChannel channel;
String user_name=System.getProperty("user.name", "n/a");
final List<String> state=new LinkedList<String>();
public static void main(String[] args) throws Exception {
new SimpleChat().start();
}
private void start() throws Exception {
channel=new JChannel();// 使用默认的配置, udp.xml【YBXIANG:】该文件位于jgroups-x.y.z.Final.jar中。
channel.setReceiver(this);//注册一个 Receiver 来接收消息并查看变化
channel.connect("ChatCluster");
channel.getState(null, 10000);
eventLoop();
channel.close();
}
private void eventLoop() {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
while(true) {
try {
System.out.print(">");
System.out.flush();
String line=in.readLine().toLowerCase();
if(line.startsWith("quit") || line.startsWith("exit"))
break;
line="[" + user_name + "] " + line;
Message msg=new Message(null, line);
channel.send(msg);
}
catch(Exception e) {
}
}
}
//如果有节点加入后会回调此函数
public void viewAccepted(View new_view) {
System.out.println("** view: " + new_view);
}
//接收到消息后会调用此函数
public void receive(Message msg) {
String line=msg.getSrc() + ": " + msg.getObject();
System.out.println(line);
synchronized(state) {//同步调用
state.add(line);
}
}
//getState回调方法
public void getState(OutputStream output) throws Exception {
synchronized(state) {
Util.objectToStream(state, new DataOutputStream(output));
}
}
// 从input stream中读取状态，然后做相应的设置：
public void setState(InputStream input) throws Exception {
List<String> list;
list=(List<String>)Util.objectFromStream(new DataInputStream(input));
synchronized(state) {
state.clear();
state.addAll(list);
}
System.out.println(list.size() + " messages in chat history):");
for(String str: list) {
System.out.println(str);
}
}
}
架包：
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