Java编程实现多线程TCP服务器完整实例

Socket

·功能:TCP客户端套接字

·构造方法:

  Socket(InetAddress address, int port)

  创建一个流套接字并将其连接到指定 IP 地址的指定端口号

·常用方法:

  1.getInetAddress

  获得InetAddress的相关信息

  2.getInputStream

  获得此TCP连接的输入流

  3.getOutPutStream

  获得此TCP连接的输出流

ServerSocket

·功能: TCP服务端套接字

·构造方法:

  ServerSocket(int port)

  创建绑定到特定端口的服务器套接字。

·常用方法:

  1.accept

  获得TCP连接的客户端的socket

  2.isClosed

  获得ServerSocket的关闭状态

TCP服务器端

TcpServer.java

服务器端采用多线程的方式,每建立一个连接就启动一个java线程,发送图片给客户端,之后关闭此TCP连接

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.net.ServerSocket;

import java.net.Socket;

public class TcpServer extends Thread{

    Socket clientSocket;

    public TcpServer(Socket clientSocket) {

        super();

        this.clientSocket = clientSocket;

    }

    @Override

      public void run() {

        try {

            //获得客户端的ip地址和主机名

            String clientAddress = clientSocket.getInetAddress().getHostAddress();

            String clientHostName = clientSocket.getInetAddress().getHostName();

            System.out.println(clientHostName + "(" + clientAddress + ")" + " 连接成功!");

            System.out.println("Now, 传输图片数据...........");

            long startTime = System.currentTimeMillis();

            //获取客户端的OutputStream

            OutputStream out = clientSocket.getOutputStream();

            //传出图片数据

            FileInputStream in = new FileInputStream(new File("/home/gavinzhou/test.jpg"));

            byte[] data = new byte[4096];

            int length = 0;

            while((length = in.read(data)) != -1){

                out.write(data, 0, length);

                //写出数据

            }

            long endTime = System.currentTimeMillis();

            //提示信息

            System.out.println(clientHostName + "(" + clientAddress + ")" + " 图片传输成功," + "用时:" + ((endTime-startTime)) + "ms");

            //关闭资源

            in.close();

            clientSocket.close();

            System.out.println("连接关闭!");

        }

        catch (IOException e) {

            e.printStackTrace();

        }

    }

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

        //建立TCP连接服务,绑定端口

        ServerSocket tcpServer = new ServerSocket(9090);

        //接受连接,传图片给连接的客户端,每个TCP连接都是一个java线程

        while(true){

            Socket clientSocket = tcpServer.accept();

            new TcpServer(clientSocket).start();

        }

    }

}

　　

TCP客户端

TcpClient

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.InetAddress;

import java.net.Socket;

public class TcpClient {

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

        // 建立TCP服务

        // 连接本机的TCP服务器

        Socket socket = new Socket(InetAddress.getLocalHost(), 9090);

        // 获得输入流

        InputStream inputStream = socket.getInputStream();

        // 写入数据

        FileOutputStream out = new FileOutputStream(new File("../save.jpg"));

        byte[] data = new byte[4096];

        int length = 0;

        while((length = inputStream.read(data)) != -1){

            out.write(data, 0, length);

        }

        //关闭资源

        out.close();

        socket.close();

    }

}

　　

结果

首先,命令行启动服务器端,之后启动客户端,结果如下:

图片比较小,速度很快!