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服务端代码如下:
package com.itheima.SocketAioBroad;
/*
* aio聊天服务端代码，请先启动服务端的控制台，再启动客户端控制台，
* Client,Client2,Client3均是客户端，模拟多人聊天室
*/
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousServerSocketChannel;
import java.nio.channels.AsynchronousSocketChannel;
import java.nio.charset.Charset;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicInteger;
/*读任务节点类*/
class TaskNode
{
/*异步结果变量*/
private Future<Integer> taskResult;
/*缓存变量*/
private ByteBuffer buffer;
/*异步通道*/
private AsynchronousSocketChannel channel;
/*任务节点的构造方法*/
public TaskNode(Future<Integer> result,ByteBuffer buffer,AsynchronousSocketChannel channel)
{
this.taskResult = result;
this.buffer = buffer;
this.channel = channel;
}
/*释放任务节点*/
public void freeData()
{
this.buffer.clear();
this.buffer = null;
this.taskResult = null;
this.channel = null;
}
/*其他get,set方法不再赘述*/
public Future<Integer> getTaskResult() {
return taskResult;
}
public void setTaskResult(Future<Integer> taskResult) {
this.taskResult = taskResult;
}
public ByteBuffer getBuffer() {
return buffer;
}
public void setBuffer(ByteBuffer buffer) {
this.buffer = buffer;
}
public AsynchronousSocketChannel getChannel() {
return channel;
}
public void setChannel(AsynchronousSocketChannel channel) {
this.channel = channel;
}
}
public class Server2 {
/*端口*/
private final static int PORT = 9888;
/*编解码*/
private Charset charset = Charset.forName("UTF-8");
/*异步通道的服务器通道,接受异步通道的连接*/
private volatile AsynchronousServerSocketChannel server;
/*写缓存*/
private ByteBuffer buffer = ByteBuffer.allocate(1024);
/*废弃的变量*/
private ByteBuffer buffer2 = ByteBuffer.allocate(1024);
/*网上搜索的黑科技，请百度下这个CopyOnWriteArrayList,
* 是读写线程安全的并发列表,这里存储的是异步通道
*/
private volatile CopyOnWriteArrayList<AsynchronousSocketChannel> list;
/*废弃的变量*/
private volatile AtomicInteger nReadTimes;
/*同上安全的并发列表，存储的是读任务的节点*/
private volatile CopyOnWriteArrayList<TaskNode> readlist;
/*构造方法*/
public Server2() throws Exception
{
this.nReadTimes = new AtomicInteger(0);
this.setList(new CopyOnWriteArrayList<AsynchronousSocketChannel>());
this.setReadlist(new CopyOnWriteArrayList<TaskNode>());
this.setServer(AsynchronousServerSocketChannel.open().bind(new InetSocketAddress(PORT)));
}
/*核心方法一，服务器通道接受异步通道客户端的连接*/
public void accept() throws Exception
{
buffer.clear();
AsynchronousSocketChannel asc = null;
/*服务器循环接受客户端连接*/
while((asc = server.accept().get())!=null)
{
/*如果客户端通道列表没有包含，则添加连接到的客户端*/
if(!Server2.this.getList().contains(asc))
{
Server2.this.getList().add(asc);
/*给客户端的欢迎信息*/
String string = null;
try {
string = "欢迎"+asc.getRemoteAddress()+"来到聊天室,在线人数"+Server2.this.getList().size();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
/*循环发送给已经连接的客户端，
* 这里注意buffer的操作:
* clear,put,flip,write*/
for(AsynchronousSocketChannel temp:Server2.this.getList())
{
buffer.clear();
buffer.put((string).getBytes(charset));
buffer.flip();
try {
temp.write(buffer).get();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
buffer.clear();
}
/*发送完欢迎信息等于宣告客户端与服务端连接完成，然后服务端等待客户端发来消息，并读取*/
/*这里是将异步读任务先存储起来*/
ByteBuffer rb = ByteBuffer.allocate(1024);
Future<Integer> ft = asc.read(rb);
Server2.this.readlist.add(new TaskNode(ft, rb, asc));
}
}
/*客户端连接服务端的线程，详见核心方法一*/
public void startFuture() throws Exception
{
new Thread(new Runnable() {
@Override
public void run()
{
// TODO Auto-generated method stub
try {
Server2.this.accept();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}).start();
}
/*核心方法二,读线程处理读任务节点*/
public void readFuture() throws Exception
{
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
while(true)
{
TaskNode curNode = null;
/*如果读任务的列表不为空*/
if(!Server2.this.readlist.isEmpty())
{
/*循环开始检测异步读任务是否完成，
* 因为是异步的如果用 task.get()>0判断
* 读任务正常完成会阻塞，这里用buffer.remaining判断*/
for(TaskNode task:Server2.this.readlist)
{
if(task.getBuffer().remaining()!=1024)
{
/*如果一个通道的读任务完成了，则进行标记*/
curNode = task;
break;
}
}
if(curNode!=null)
{
/*如果标记不为空，则取出读到的内容*/
String receivMsg = new String(curNode.getBuffer().array(),charset).trim();
/*声明要广播的内容变量*/
String wMsg = null;
/*获取标记已读节点的地址内容*/
try {
wMsg = "[客户端:" + curNode.getChannel().getRemoteAddress() + "]:";
} catch (IOException e) {
e.printStackTrace();
}
/*将标记已读节点从列表中删除*/
Server2.this.readlist.remove(curNode);
AsynchronousSocketChannel asc = curNode.getChannel();
/*如果读到的节点内容不是退出标示*/
if(!receivMsg.equals("exit"))
{
/*再构造一个相同客户端通道的读任务节点，并加入读列表*/
ByteBuffer rb = ByteBuffer.allocate(1024);
Future<Integer> ft = asc.read(rb);
Server2.this.readlist.add(new TaskNode(ft, rb, asc));
/*封装广播信息*/
wMsg = (wMsg + receivMsg).trim();
/*进行广播,注意传入的参数有个已读节点的通道地址，这样不会给自己广播*/
Server2.this.writeMsg(wMsg,asc);
}
/*如果读到的节点内容是退出标示*/
else
{
/*则无需再构造一个读节点,封装下线信息广播*/
wMsg = (wMsg + "已经下线,在线人数" + (Server2.this.getList().size()-1)).trim();
/*这里会将广播信息发送给本人，因为客户端本地要判断下线*/
Server2.this.writeMsg(wMsg,null);
/*如果通道下线,则移除*/
Server2.this.getList().remove(asc);
try {
/*关闭通道*/
asc.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*释放已读节点*/
curNode.freeData();
curNode = null;
}
}
}
}
}).start();
}
/*广播消息，如果传入客户端通道，则排除，
* 不广播给自己；如果传入null，则广播给自己*/
public void writeMsg(String msg,AsynchronousSocketChannel except)
{
System.out.println(msg);
for(AsynchronousSocketChannel asc:this.getList())
{
if(except==null||!asc.equals(except))
{
buffer.clear();
buffer.put((msg).getBytes(charset));
buffer.flip();
try {
Integer tInteger = asc.write(buffer).get();
if(tInteger>0)
{
System.out.println("发送成功!!");
buffer.clear();
}
else
{
System.out.println("发送失败!!");
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
/*主函数启动连接线程和读取异步节点的线程*/
public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
Server2 temp = new Server2();
temp.startFuture();
temp.readFuture();
}
/*其他set,get方法不再赘述*/
public Charset getCharset() {
return charset;
}
public void setCharset(Charset charset) {
this.charset = charset;
}
public AsynchronousServerSocketChannel getServer() {
return server;
}
public void setServer(AsynchronousServerSocketChannel server) {
this.server = server;
}
public AtomicInteger getnReadTimes() {
return nReadTimes;
}
public void setnReadTimes(AtomicInteger nReadTimes) {
this.nReadTimes = nReadTimes;
}
public static int getPort() {
return PORT;
}
public ByteBuffer getBuffer() {
return buffer;
}
public void setBuffer(ByteBuffer buffer) {
this.buffer = buffer;
}
public ByteBuffer getBuffer2() {
return buffer2;
}
public void setBuffer2(ByteBuffer buffer2) {
this.buffer2 = buffer2;
}
public void setList(CopyOnWriteArrayList<AsynchronousSocketChannel> list) {
this.list = list;
}
public void setReadlist(CopyOnWriteArrayList<TaskNode> readlist) {
this.readlist = readlist;
}
public CopyOnWriteArrayList<AsynchronousSocketChannel> getList() {
return list;
}
public CopyOnWriteArrayList<TaskNode> getReadlist() {
return readlist;
}
}
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