采用Java nio 实现的一个简单的服务器

服务器代码:

package server.nio;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Server {


    private static Logger log = LoggerFactory.getLogger(Server.class);

    private static final Integer Default_Port = 9527;

    private static final Integer Default_Timeout = 2000;

    private static ConcurrentLinkedQueue workeQueue = new ConcurrentLinkedQueue<>();

    private static ExecutorService executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    private Integer port;

    private Integer timeout;



    public Server() {
        this(Default_Port,Default_Timeout);
    }

    public Server(Integer port){
        this(port,Default_Timeout);
    }

    public Server(Integer port,Integer timeout) throws IllegalArgumentException{
        if(port == null) port = Default_Port;
        if(timeout == null) timeout = Default_Timeout;

        this.port = port;
        this.timeout = timeout;

        long st = System.currentTimeMillis();
        try {
            log.debug("服务器开始启动-->>");
            ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
            serverSocketChannel.configureBlocking(false);
            serverSocketChannel.bind(new InetSocketAddress(Default_Port));

            //启动监听workQueue队列的线程
            log.debug("任务队列监听线程启动开始--->>");
            startListener();
            log.debug("任务队列监听线程启动完成---<<");
            //启动服务器

            long et = System.currentTimeMillis();
            log.debug("服务器启动完成:--<<");
            log.debug("启动耗时:"+(et-st));
            start(serverSocketChannel);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void startListener() {
        Thread t = new Thread(new Runnable() {
            public void run() {
                while(true){
                    final SocketChannel sc = workeQueue.poll();
                    try {
                        if(sc != null){
                            if(log.isDebugEnabled()){
                                log.debug("开始处理客户端请求:"+sc);
                            }
                            executorService.submit(new Callable() {

                                @Override
                                public Response call() throws Exception {

                                    //创建字节缓冲区
                                    ByteBuffer bytes = ByteBuffer.allocate(64);
                                    ArrayList list = new ArrayList<>();
                                    try {
                                        //从通道中读取字节到缓冲区
                                        while(sc.read(bytes) != -1){

                                            bytes.flip();
                                            //判断字节缓冲区是否已满
                                            while(bytes.remaining() > 0){

                                                //将缓冲区中的字节数组放到list中
                                                //字节缓冲区满,但通道中的数据可能还没有读取完,因此需要将字节先保存起来
                                                //最后统一处理(如果不这样做,可能会出现意外的结果:如最后转化成字符串,如不这样做,会因字节不完整而乱码)
                                                list.add(bytes.get());
                                                //清空字节缓冲区,以接收通道中剩余的数据
                                            }
                                            bytes.clear();
                                        }

                                        byte[] temp = new byte[list.size()];
                                        //将list中的数据放到temp字节数组中
                                        for(int i=0;i//反序列化开始
                                        try{
                                            ByteArrayInputStream bin = new ByteArrayInputStream(temp);
                                            ObjectInputStream oin = new ObjectInputStream(bin);
                                            Object obj = oin.readObject();

//                                          Object obj = ObjectUtil.deserializeJdk(temp);
                                            System.out.println(obj);
                                        }catch(Exception e){
                                            log.debug("反序列化对象失败:请检查是否实现Serializable接口:");
                                            e.printStackTrace();
                                        }
                                        //反序列化开始结束


                                    } catch (Exception e) {
                                        e.printStackTrace();
                                    }

                                    //处理响应对象

//                                  ByteArrayOutputStream baos = new ByteArrayOutputStream();
//                                  ObjectOutputStream oos = new ObjectOutputStream(baos);
//                                  //将返回的对象序列化
//                                  oos.writeObject(response);
//                                  //将byte数组转换成通道可以接受的ByteBuffer类型
//                                  ByteBuffer writeBytes = ByteBuffer.wrap(baos.toByteArray());
//                                  sc.write(writeBytes);
//                                  sc.close();
                                    return null;
                                }
                            });

                        }
                    } catch (Exception e) {

                        e.printStackTrace();
                    }finally{
                        if(sc != null){
                            log.debug("客户端链接:"+sc+":关闭");
                        }else{
                            try {
                                Thread.sleep(2000);
                            } catch (InterruptedException e) {
                            }
                            log.debug("等待连接....");
                        }
                    }
                }
            }
        });

        t.start();
    }

    private void start(ServerSocketChannel serverSocketChannel) {
        while(true){
            try {
                SocketChannel socketChannel = serverSocketChannel.accept();
                if(socketChannel != null){
                    if(log.isDebugEnabled()){
                        log.debug("客户端连接放进任务队列中:"+serverSocketChannel);
                    }
                    workeQueue.add(socketChannel);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 响应对象
     * @author Administrator
     *
     */
    public class Response implements Serializable {
//      private Integer status;
//      
//      private Integer code;
//      
//      private String desc;
//      
//      private Object data;
//
//      
//      public String getDesc() {
//          return desc;
//      }
//
//      public void setDesc(String desc) {
//          this.desc = desc;
//      }
//
//      public Integer getStatus() {
//          return status;
//      }
//
//      public void setStatus(Integer status) {
//          this.status = status;
//      }
//
//      public Integer getCode() {
//          return code;
//      }
//
//      public void setCode(Integer code) {
//          this.code = code;
//      }
//
//      public Object getData() {
//          return data;
//      }
//
//      public void setData(Object data) {
//          this.data = data;
//      }
//      
    }
}

客户端类:

package client.nio;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;

public class Client {

    public static void main(String[] args) throws Exception {

        SocketChannel socketChannel = SocketChannel.open();
        socketChannel.connect(new InetSocketAddress(InetAddress.getLocalHost(), 9527));

//      String test1 = "hello world";
        String test = "Java IO的各种流是阻塞的。这意味着,当一个线程调用read() 或 write()时,该线程被阻塞,直到有一些数据被读取,或数据完全写入。该线程在此期间不能再干任何事情了。 Java NIO的非阻塞模式,使一个线程从某通道发送请求读取数据,但是它仅能得到目前可用的数据,如果目前没有数据可用时,就什么都不会获取。而不是保持线程阻塞,所以直至数据变的可以读取之前,该线程可以继续做其他的事情。 非阻塞写也是如此。一个线程请求写入一些数据到某通道,但不需要等待它完全写入,这个线程同时可以去做别的事情。 线程通常将非阻塞IO的空闲时间用于在其它通道上执行IO操作,所以一个单独的线程现在可以管理多个输入和输出通道(channel)。";

        //序列化
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream oout = new ObjectOutputStream(bout);
        oout.writeObject(test);

        //创建字节缓冲区并发送给服务端
        ByteBuffer buffer = ByteBuffer.wrap(bout.toByteArray());
        socketChannel.write(buffer);

        socketChannel.close();

    }
}

测试:


启动服务器:
package server.nio;

public class Main {

    public static void main(String[] args) {
        Server server = new Server();

    }
}
![这里写图片描述](https://img-blog.csdn.net/20161208180036256?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcXFfMjUwMTQ1OTk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
启动客户端并发送消息:

![这里写图片描述](https://img-blog.csdn.net/20161208175459426?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcXFfMjUwMTQ1OTk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)

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