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!